| 掺杂La2O3对刚玉基复相陶瓷的烧结和力学性能的影响 |
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| 引用本文： | 徐晓虹,孙梦珂,吴建锋,田江洲,周士翔,米凯峰.掺杂La2O3对刚玉基复相陶瓷的烧结和力学性能的影响[J].硅酸盐通报,2017,36(10):3432-3438. |
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| 作者姓名： | 徐晓虹 孙梦珂 吴建锋 田江洲 周士翔 米凯峰 |
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| 作者单位： | 武汉理工大学材料科学与工程学院,武汉,430070 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目(2010CB227100)%湖北省科技支撑计划项目(2015BCE082) |
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| 摘 要： | 刚玉基复相陶瓷材料具有高硬度、高强度及耐磨性等优异的力学性能,是结构陶瓷领域研究的热点之一,具有广阔的应用前景.以α-Al2O3、SiC和ZrO2为原料,掺杂少量稀土氧化物La2O3,采用无压埋烧工艺,制备了稀土掺杂刚玉基复相陶瓷.通过XRD、SEM等手段研究La2O3添加量对复相陶瓷微观结构和性能的影响.结果表明:掺杂La2O3可将复相陶瓷的烧结温度降低至1540℃,经1540℃烧结的掺杂复相陶瓷强度和硬度分别为183 MPa和18.46 GPa.La2O3位于晶界处抑制晶粒长大,促进晶粒细化,利于样品的致密化,同时其晶界强化作用有利于复相陶瓷强度的提高.
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| 关 键 词： | 刚玉基复相陶瓷 稀土氧化物 结构与性能 |
Effect of La2O3 on the Sintering and Mechanical Properties of Corundum-based Composite Ceramics |
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| XU Xiao-hong,SUN Meng-ke,WU Jian-feng,TIAN Jiang-zhou,ZHOU Shi-xiang,MI Kai-feng.Effect of La2O3 on the Sintering and Mechanical Properties of Corundum-based Composite Ceramics[J].Bulletin of the Chinese Ceramic Society,2017,36(10):3432-3438. |
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| Authors: | XU Xiao-hong SUN Meng-ke WU Jian-feng TIAN Jiang-zhou ZHOU Shi-xiang MI Kai-feng |
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| Abstract: | Corundum-based composite ceramics has become a research focus in structure ceramics for its excellent mechanical properties such as high hardness , high strength and good wear resistance , and has great application potential .La2O3 doped corundum-based composite ceramics were prepared by burying sintering with α-Al2O3, SiC and ZrO2 as starting materials.The effect of La2O3 addition on the microstructure and mechanic properties of the sintered samples were investigated using X-ray diffraction ( XRD) , scanning electron microscope et al .Experimental results show that the sintering temperature of the La2O3 doped composite ceramics is reduced to 1540 ℃.The bending strength and hardness of the doped composite ceramic is 183 MPa and 18.46 GPa.The addition of La2O3 inhibited the matrix grain growth, which promoted grain refinement and facilitated the densification of the sample , and its grain boundary strengthening is beneficial to the improvement of the strength of the composite ceramics . |
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| Keywords: | corundum-based composite ceramics rare-earth oxide structure and property |
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