Study on Microstructure and Mechanical Properties of WC/MgO/CeO Composites AITranslate
Abstract AITranslate
Based on the preparation of WC/MgO cemented carbides by vacuum hot pressing sintering,WC/MgO/CeO2 composites were obtained by adding appropriate amount of rare earth additive CeO2 and changing sintering parameters,and the phase composition,microstructure densification process and mechanical properties of the composites were studied.The results show that with the increase of sintering temperature,the grains gradually grow.At 1 650 ℃,the WC average grain size is 1.674 μm,the grain edge is round,the relative density is 96.979%,Vickers hardness is 16.251 GPa and fracture toughness is 10.326 MPa·m1/2.When the temperature rises to 1 720 ℃,part of WC grains abnormally grow,the edges are more angular,and the relative density is still slightly increasing,but the mechanical properties significantly decrease.According to the average grain size data of WC at different sintering temperature for different durations,the molar activation energy required for grain growth of WC/MgO/CeO2 composites during hot pressing sintering is calculated to be 459.13 kJ/mol.Compared with WC/MgO composites,the activation energy for grain growth of WC/MgO/CeO2 composites increases,which can be attributed to the fact that CeO2 reduces the surface energy or interfacial energy of WC grains.
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Basic Information:
DOI：
Chinese Library Classification Number:TF124[冶金工程—粉末冶金]
Citation Information:
Based on the preparation of WC/MgO cemented carbides by vacuum hot pressing sintering,WC/MgO/CeO2 composites were obtained by adding appropriate amount of rare earth additive CeO2 and changing sintering parameters,and the phase composition,microstructure densification process and mechanical properties of the composites were studied.The results show that with the increase of sintering temperature,the grains gradually grow.At 1 650 ℃,the WC average grain size is 1.674 μm,the grain edge is round,the relative density is 96.979%,Vickers hardness is 16.251 GPa and fracture toughness is 10.326 MPa·m1/2.When the temperature rises to 1 720 ℃,part of WC grains abnormally grow,the edges are more angular,and the relative density is still slightly increasing,but the mechanical properties significantly decrease.According to the average grain size data of WC at different sintering temperature for different durations,the molar activation energy required for grain growth of WC/MgO/CeO2 composites during hot pressing sintering is calculated to be 459.13 kJ/mol.Compared with WC/MgO composites,the activation energy for grain growth of WC/MgO/CeO2 composites increases,which can be attributed to the fact that CeO2 reduces the surface energy or interfacial energy of WC grains.
quote
| GB/T 7714-2015 | [1] CHENG Kai, DI Ping, ZHU Shi-gen. Study on Microstructure and Mechanical Properties of WC/MgO/CeO Composites[J]. Rare Metals and Cemented Carbides, 2020(5): 15-22. |
| MLA | [1] CHENG Kai, et al., "Study on Microstructure and Mechanical Properties of WC/MgO/CeO Composites." Rare Metals and Cemented Carbides, no. 5, 2020, pp. 15-22. |
| APA | [1] CHENG Kai, DI Ping, & ZHU Shi-gen. (2020). Study on Microstructure and Mechanical Properties of WC/MgO/CeO Composites. Rare Metals and Cemented Carbides(5), 15-22. |
| IEEE | [1] CHENG Kai, DI Ping, and ZHU Shi-gen, "Study on Microstructure and Mechanical Properties of WC/MgO/CeO Composites," Rare Metals and Cemented Carbides, no. 5, pp. 15-22, 2020. keywords: {WC/MgO cemented carbide;CeO2;hot pressing sintering;microstructure;mechanical property} |