| LaB_6和La_2O_3添加剂对ZrB_2-SiC超高温陶瓷结构与性能的影响 |
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| 引用本文： | 朱时珍,徐强,杨洋,程琨.LaB_6和La_2O_3添加剂对ZrB_2-SiC超高温陶瓷结构与性能的影响[J].稀有金属材料与工程,2009,38(Z2). |
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| 作者姓名： | 朱时珍 徐强 杨洋 程琨 |
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| 作者单位： | 北京理工大学,北京,100081 |
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| 摘 要： | 采用SPS工艺制备添加La_2O_3或LaB_6的ZrB_2-SiC陶瓷,测量试样的密度和力学性能,利用扫描电镜和透射电镜观察试样的微观形貌,研究添加镧的不同化合物对ZrB_2-SiC陶瓷显微结构和力学性能的影响,分析添加量对材料力学性能的影响.同时对ZrB_2-SiC-La_2O_3和ZrB_2-SiC-LaB_6陶瓷进行热处理,考察热处理对其力学性能的影响.结果表明,加入2.5%或5%(质量分数, 下同)的La_2O_3或LaB_6添加剂后,材料的室温强度、高温强度、断裂韧性都比无添加剂时要高;当含量相同时,加入LaB_6比La_2O_3更有利于提高陶瓷材料的室温强度;当添加剂的含量为2.5%时,材料的室温强度比较好,当添加剂的含量为5%时,材料的高温强度和断裂韧性比较高.热处理可以提高ZrB_2-SiC-La_2O_3和ZrB_2-SiC-LaB_6陶瓷材料的高温强度.
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| 关 键 词： | 超高温陶瓷 力学性能 氧化镧 硼化镧 |
Effect of Additives of La_2O_3 and LaB_6 on Microstructure and Mechanical Properties of ZrB_2-SiC Ceramic Composites |
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| Zhu Shizhen,Xu Qiang,Yang Yang,Cheng Kun.Effect of Additives of La_2O_3 and LaB_6 on Microstructure and Mechanical Properties of ZrB_2-SiC Ceramic Composites[J].Rare Metal Materials and Engineering,2009,38(Z2). |
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| Authors: | Zhu Shizhen Xu Qiang Yang Yang Cheng Kun |
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| Affiliation: | Zhu Shizhen,Xu Qiang,Yang Yang,Cheng Kun (Beijing Institute of Technology,Beijing 100081,China) |
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| Abstract: | ZrB2-SiC ceramic composites added with La2O3 and LaB6 additives were prepared by SPS process. The properties such as density,strength and fracture toughness were tested. The microstructures were observed by SEM and TEM. Both the effect of different compounds including La and the effect of the additive content on the microstructures and mechanical properties of ZrB2-SiC ceramic composites were discussed. The effect of heat treatment on ZrB2-SiC ceramic composites with La2O3/LaB6 additives was investigated. T... |
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| Keywords: | ZrB_2-SiC ultra-high temperature ceramics ZrB_2-SiC mechanical properties La_2O_3 LaB_6 |
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