| 微波烧结工艺对6％Al2O3/Mo复合材料结构和性能的影响 |
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| 引用本文： | 段柏华,张钊,杨栋林,王德志.微波烧结工艺对6％Al2O3/Mo复合材料结构和性能的影响[J].有色金属科学与工程,2019,10(4):59-65. |
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| 作者姓名： | 段柏华 张钊 杨栋林 王德志 |
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| 作者单位： | 中南大学, 材料科学与工程学院,长沙 410083;中南大学,有色金属材料科学与工程教育部重点实验室,长沙 410083;中南大学, 材料科学与工程学院,长沙 410083 |
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| 基金项目： | 国家重点研发计划资助项目2017YFB0305601 |
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| 摘 要： | 以溶胶凝胶法制备的6% Al2O3/Mo复合粉末为原料，采用微波烧结技术制备了6% Al2O3/Mo复合材料.研究了微波烧结温度及烧结时间对复合材料的结构及性能的影响，并探讨了复合粉末的微波烧结动力学.结果表明:溶胶凝胶法制备的6% Al2O3/Mo复合粉末形貌呈平滑多边形和近球形；Al2O3/Mo复合材料的致密度及硬度均随着微波烧结温度及烧结时间的增加而增加；1 600 ℃下烧结30 min的6% Al2O3的复合材料致密度及硬度达到98.1%和2.969 GPa. Al2O3/Mo复合粉体微波烧结的致密化机制是体积扩散和晶界扩散共同作用结果，且随烧结温度升高，体积扩散逐渐占据主导地位，其微波烧结激活能在1 500~1 600 ℃范围内为201.93 kJ/mol.研究结果显示微波烧结是一种快速制备高致密Al2O3/Mo复合材料的有效方法.
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| 关 键 词： | 微波烧结 A2O3/Mo复合材料 动力学 烧结激活能 |
| 收稿时间： | 2019-03-29 |
Effect of microwave sintering on microstructure and properties of 6% Al2O3/Mo composite material |
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| Affiliation: | a.School of Materials Science and Engineering, Central South University, Changsha 410083, Chinab.Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China |
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| Abstract: | 6% Al2O3/Mo composite powder was prepared by sol-gel method. The powder was then used as raw material to prepare 6% Al2O3/Mo composite material by microwave sintering. The effects of microwave sintering temperature and sintering time on microstructure and properties of the composite material were studied, and the microwave sintering kinetics of the composite powder was also discussed. The results showed that the morphology of the powder was smoothly polyhedral and nearly spherical. The density and hardness of Al2O3/Mo composite material increased with the increase of microwave sintering temperature and sintering time, and reached 98.1% and 2.969 GPa, respectively, at the sintering temperature of 100 ℃ for 30 min. The densification mechanism of 6% Al2O3/Mo composite powder by microwave sintering was the result of volume diffusion and grain boundary diffusion. With the increase of sintering temperature, volume diffusion gradually dominated, and the activation energy of microwave sintering was 201.93 kJ/mol in the temperature range of 1 500~1 600 ℃. The research showed that microwave sintering was an effective method for rapid preparation of high density Al2O3/Mo composite material. |
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