A new strategy to efficiently fabricate tungsten carbide coating on tungsten: Two-step interstitial carburization
A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Zhao, Ziyuan [verfasserIn] |
|---|
| Format: |
E-Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2020transfer abstract |
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| Übergeordnetes Werk: |
Enthalten in: A high efficiency solar steam generation system with using residual heat to enhance steam escape - Bai, Binglin ELSEVIER, 2020, Amsterdam [u.a.] |
|---|---|
| Übergeordnetes Werk: |
volume:389 ; year:2020 ; day:15 ; month:05 ; pages:0 |
| Links: |
|---|
| DOI / URN: |
10.1016/j.surfcoat.2020.125579 |
|---|
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ELV050017349 |
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| 520 | |a A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. | ||
| 520 | |a A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. | ||
| 700 | 1 | |a Liu, Fuyuan |4 oth | |
| 700 | 1 | |a Zhao, Mingxuan |4 oth | |
| 700 | 1 | |a Zhong, Lisheng |4 oth | |
| 700 | 1 | |a Xu, Yunhua |4 oth | |
| 700 | 1 | |a Li, Junming |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Bai, Binglin ELSEVIER |t A high efficiency solar steam generation system with using residual heat to enhance steam escape |d 2020 |g Amsterdam [u.a.] |w (DE-627)ELV004415906 |
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10.1016/j.surfcoat.2020.125579 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001006.pica (DE-627)ELV050017349 (ELSEVIER)S0257-8972(20)30248-6 DE-627 ger DE-627 rakwb eng 570 690 VZ 58.51 bkl Zhao, Ziyuan verfasserin aut A new strategy to efficiently fabricate tungsten carbide coating on tungsten: Two-step interstitial carburization 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. Liu, Fuyuan oth Zhao, Mingxuan oth Zhong, Lisheng oth Xu, Yunhua oth Li, Junming oth Enthalten in Elsevier Science Bai, Binglin ELSEVIER A high efficiency solar steam generation system with using residual heat to enhance steam escape 2020 Amsterdam [u.a.] (DE-627)ELV004415906 volume:389 year:2020 day:15 month:05 pages:0 https://doi.org/10.1016/j.surfcoat.2020.125579 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 58.51 Abwassertechnik Wasseraufbereitung VZ AR 389 2020 15 0515 0 |
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10.1016/j.surfcoat.2020.125579 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001006.pica (DE-627)ELV050017349 (ELSEVIER)S0257-8972(20)30248-6 DE-627 ger DE-627 rakwb eng 570 690 VZ 58.51 bkl Zhao, Ziyuan verfasserin aut A new strategy to efficiently fabricate tungsten carbide coating on tungsten: Two-step interstitial carburization 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. Liu, Fuyuan oth Zhao, Mingxuan oth Zhong, Lisheng oth Xu, Yunhua oth Li, Junming oth Enthalten in Elsevier Science Bai, Binglin ELSEVIER A high efficiency solar steam generation system with using residual heat to enhance steam escape 2020 Amsterdam [u.a.] (DE-627)ELV004415906 volume:389 year:2020 day:15 month:05 pages:0 https://doi.org/10.1016/j.surfcoat.2020.125579 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 58.51 Abwassertechnik Wasseraufbereitung VZ AR 389 2020 15 0515 0 |
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10.1016/j.surfcoat.2020.125579 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001006.pica (DE-627)ELV050017349 (ELSEVIER)S0257-8972(20)30248-6 DE-627 ger DE-627 rakwb eng 570 690 VZ 58.51 bkl Zhao, Ziyuan verfasserin aut A new strategy to efficiently fabricate tungsten carbide coating on tungsten: Two-step interstitial carburization 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. Liu, Fuyuan oth Zhao, Mingxuan oth Zhong, Lisheng oth Xu, Yunhua oth Li, Junming oth Enthalten in Elsevier Science Bai, Binglin ELSEVIER A high efficiency solar steam generation system with using residual heat to enhance steam escape 2020 Amsterdam [u.a.] (DE-627)ELV004415906 volume:389 year:2020 day:15 month:05 pages:0 https://doi.org/10.1016/j.surfcoat.2020.125579 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 58.51 Abwassertechnik Wasseraufbereitung VZ AR 389 2020 15 0515 0 |
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10.1016/j.surfcoat.2020.125579 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001006.pica (DE-627)ELV050017349 (ELSEVIER)S0257-8972(20)30248-6 DE-627 ger DE-627 rakwb eng 570 690 VZ 58.51 bkl Zhao, Ziyuan verfasserin aut A new strategy to efficiently fabricate tungsten carbide coating on tungsten: Two-step interstitial carburization 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. Liu, Fuyuan oth Zhao, Mingxuan oth Zhong, Lisheng oth Xu, Yunhua oth Li, Junming oth Enthalten in Elsevier Science Bai, Binglin ELSEVIER A high efficiency solar steam generation system with using residual heat to enhance steam escape 2020 Amsterdam [u.a.] (DE-627)ELV004415906 volume:389 year:2020 day:15 month:05 pages:0 https://doi.org/10.1016/j.surfcoat.2020.125579 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 58.51 Abwassertechnik Wasseraufbereitung VZ AR 389 2020 15 0515 0 |
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10.1016/j.surfcoat.2020.125579 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001006.pica (DE-627)ELV050017349 (ELSEVIER)S0257-8972(20)30248-6 DE-627 ger DE-627 rakwb eng 570 690 VZ 58.51 bkl Zhao, Ziyuan verfasserin aut A new strategy to efficiently fabricate tungsten carbide coating on tungsten: Two-step interstitial carburization 2020transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. Liu, Fuyuan oth Zhao, Mingxuan oth Zhong, Lisheng oth Xu, Yunhua oth Li, Junming oth Enthalten in Elsevier Science Bai, Binglin ELSEVIER A high efficiency solar steam generation system with using residual heat to enhance steam escape 2020 Amsterdam [u.a.] (DE-627)ELV004415906 volume:389 year:2020 day:15 month:05 pages:0 https://doi.org/10.1016/j.surfcoat.2020.125579 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 58.51 Abwassertechnik Wasseraufbereitung VZ AR 389 2020 15 0515 0 |
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a new strategy to efficiently fabricate tungsten carbide coating on tungsten: two-step interstitial carburization |
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A new strategy to efficiently fabricate tungsten carbide coating on tungsten: Two-step interstitial carburization |
| abstract |
A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. |
| abstractGer |
A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. |
| abstract_unstemmed |
A tungsten carbide coating on tungsten was fabricated by hot-pressing tungsten with high‑carbon steel. The interstitial carbon atoms in the high‑carbon steel diffused into the tungsten, forming a WC coating. The coating is completely nonporous, and the volume fraction of the carbide phases is close to 100%. By comparing the microstructures of the coatings fabricated by one-step hot-pressing at 1100 °C and 1150 °C, we found that increasing the temperature by 50 °C can markedly increase the growth rate of the coating as desired, but this increase of temperature generates undesired η carbide (Fe6W6C) at the coating/substrate interface. Based on the inference that Fe atoms are diffusible in tungsten but indiffusible in WC at 1150 °C, we proposed a two-step hot-pressing method to fabricate coatings at 1150 °C without introducing η carbide. The sample was first hot-pressed at 1100 °C for 4 h to prepare a pure WC layer and then hot-pressed at 1150 °C for further carburization. The WC layer prepared at 1100 °C was utilized as a semipermeable film to filter out Fe atoms and allow the diffusion of carbon atoms at 1150 °C. The two-step hot-pressing method worked as desired, and the obtained coating exhibits a distinct gradient microstructure with columnar WC grains. Compared to that of the one-step hot-pressing method at 1100 °C, the total carburization time for obtaining a coating with a saturated hardness of 2400 HV is shortened from 8 h to 6 h. Therefore, the two-step interstitial carburization can be used to efficiently fabricate high-quality and high-performance tungsten carbide coatings. |
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