Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its properties
In order to develop a binderless phase cemented carbide to reduce the application of cobalt in conventional cemented carbides,(W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> were prepared by chemical methods. Ammonium paratungstate,ammo...
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Journal of Materials Engineering
2021-03-01
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| Series: | Cailiao gongcheng |
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| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001074 |
| _version_ | 1797969626035912704 |
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| author | GUO Shi-bo YI Zheng-yi DUAN Xiao-yun WANG Nan-chuan LIAO Jing-bing |
| author_facet | GUO Shi-bo YI Zheng-yi DUAN Xiao-yun WANG Nan-chuan LIAO Jing-bing |
| author_sort | GUO Shi-bo |
| collection | DOAJ |
| description | In order to develop a binderless phase cemented carbide to reduce the application of cobalt in conventional cemented carbides,(W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> were prepared by chemical methods. Ammonium paratungstate,ammonium molybdate,aluminum nitrate,lanthanum nitrate,urea and glucose were used as raw materials to explore the different ratios of nitrate,urea and glucose by low temperature combustion method, and the optimal ratio of carbon was obtained to prepare (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub>powder.The (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> binderless phase materials were prepared by SPS sintering at 1500-1800 ℃.The mechanical properties were studied and the strengthening and toughening mechanism was analyzed. The results show that the optimum molar ratio of nitrate to urea is 1:2,the optimum molar ratio of nitrate to glucose is 1:0.5,the grain size is reduced by 0.28 μm after adding glucose,and the specific surface area is increased by 75.64%.Density,Vickers hardness and flexural strength reach maximum at 1600 ℃:98.45%,2202HV<sub>30</sub> and 1203 MPa,respectively,and the fracture toughness reaches a peak of 7.52 MPa·m<sup>1/2</sup> at 1500 ℃. (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> are mainly intergranular fracture and transgranular fracture due to the influence of grain refinement and toughening of the second phase particles at 1500-1600 ℃;the reason why (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> is mainly intergranular fracture at 1700-1800 ℃ is grain growth and the appearance of pore. |
| first_indexed | 2024-04-11T03:05:20Z |
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| id | doaj.art-afad2b4e332c434cb662568f275e87df |
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| language | zho |
| last_indexed | 2024-04-11T03:05:20Z |
| publishDate | 2021-03-01 |
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| series | Cailiao gongcheng |
| spelling | doaj.art-afad2b4e332c434cb662568f275e87df2023-01-02T13:24:41ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812021-03-0149313314010.11868/j.issn.1001-4381.2019.00107420210316Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its propertiesGUO Shi-bo0YI Zheng-yi1DUAN Xiao-yun2WANG Nan-chuan3LIAO Jing-bing4School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, ChinaSchool of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, ChinaSchool of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, ChinaSchool of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, ChinaSchool of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, ChinaIn order to develop a binderless phase cemented carbide to reduce the application of cobalt in conventional cemented carbides,(W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> were prepared by chemical methods. Ammonium paratungstate,ammonium molybdate,aluminum nitrate,lanthanum nitrate,urea and glucose were used as raw materials to explore the different ratios of nitrate,urea and glucose by low temperature combustion method, and the optimal ratio of carbon was obtained to prepare (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub>powder.The (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> binderless phase materials were prepared by SPS sintering at 1500-1800 ℃.The mechanical properties were studied and the strengthening and toughening mechanism was analyzed. The results show that the optimum molar ratio of nitrate to urea is 1:2,the optimum molar ratio of nitrate to glucose is 1:0.5,the grain size is reduced by 0.28 μm after adding glucose,and the specific surface area is increased by 75.64%.Density,Vickers hardness and flexural strength reach maximum at 1600 ℃:98.45%,2202HV<sub>30</sub> and 1203 MPa,respectively,and the fracture toughness reaches a peak of 7.52 MPa·m<sup>1/2</sup> at 1500 ℃. (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> are mainly intergranular fracture and transgranular fracture due to the influence of grain refinement and toughening of the second phase particles at 1500-1600 ℃;the reason why (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> is mainly intergranular fracture at 1700-1800 ℃ is grain growth and the appearance of pore.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001074(w,mo)c/al<sub>2</sub>o<sub>3</sub>/la<sub>2</sub>o<sub>3</sub>low temperature combustion methodspark plasma sintering(sps)strengthening and toughening mechanismmechanical property |
| spellingShingle | GUO Shi-bo YI Zheng-yi DUAN Xiao-yun WANG Nan-chuan LIAO Jing-bing Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its properties Cailiao gongcheng (w,mo)c/al<sub>2</sub>o<sub>3</sub>/la<sub>2</sub>o<sub>3</sub> low temperature combustion method spark plasma sintering(sps) strengthening and toughening mechanism mechanical property |
| title | Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its properties |
| title_full | Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its properties |
| title_fullStr | Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its properties |
| title_full_unstemmed | Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its properties |
| title_short | Preparation of (W,Mo)C/Al<sub>2</sub>O<sub>3</sub>/La<sub>2</sub>O<sub>3</sub> composite powder by low temperature combustion method and its properties |
| title_sort | preparation of w mo c al sub 2 sub o sub 3 sub la sub 2 sub o sub 3 sub composite powder by low temperature combustion method and its properties |
| topic | (w,mo)c/al<sub>2</sub>o<sub>3</sub>/la<sub>2</sub>o<sub>3</sub> low temperature combustion method spark plasma sintering(sps) strengthening and toughening mechanism mechanical property |
| url | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001074 |
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