| 常压烧结制备ZrB_2-SiC复相陶瓷材料 |
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| 引用本文： | 张辉,闫永杰,黄政仁,刘学建. 常压烧结制备ZrB_2-SiC复相陶瓷材料[J]. 稀有金属材料与工程, 2009, 38(Z2) |
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| 作者姓名： | 张辉 闫永杰 黄政仁 刘学建 |
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| 作者单位： | 1. 中国科学院上海硅酸盐研究所,上海,200050;中国科学院研究生院,北京,100049
2. 中国科学院上海硅酸盐研究所,上海,200050 |
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| 摘 要： | 以溶胶凝胶法合成的亚微米级和市售微米级ZrB_2粉体为原料,B4C和Mo为烧结助剂,在氩气气氛下,常压烧结制得ZrB_2-SiC复相超高温陶瓷材料.研究结果表明,亚微米级ZrB_2超细粉体的加入对ZrB_2-SiC复相陶瓷的常压烧结致密化有一定的促进作用,但对材料性能的影响不太明显.当超细粉体占到粉体质量的30%时,材料的相对密度约为97%.复相材料的三点抗弯强度为(327±56) MPa,弹性模量为(365±30) GPa,维氏硬度和断裂韧性分别为(12.30±0.75) GPa和(3.39±0.35) MPa·m~(1/2).另外,从材料的SEM照片明显看出,在压痕棱角尖端出现裂纹分叉现象,同时在裂纹延伸过程中发生偏转,断裂模式多为穿晶断裂,较少为沿晶断裂.
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| 关 键 词： | 常压烧结 力学性能 显微结构 |
Pressureless Sintering of ZrB_2-SiC Composites Strengthening by Ultra-Fine Ceramic Powders |
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| Zhang Hui,Yan Yongjie,Huang Zhengren,Liu Xuejian. Pressureless Sintering of ZrB_2-SiC Composites Strengthening by Ultra-Fine Ceramic Powders[J]. Rare Metal Materials and Engineering, 2009, 38(Z2) |
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| Authors: | Zhang Hui Yan Yongjie Huang Zhengren Liu Xuejian |
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| Affiliation: | Zhang Hui 1,2,Yan Yongjie 1,Huang Zhengren 1,Liu Xuejian1 (1. Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China) (2. Graduate School of the Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | Commercially available and sol-gel synthesized ZrB2 ultra-fine ceramic powders were used as the raw materials. Nearly full density ZrB2-SiC ceramic composites were pressurelessly sintered with B4C and Mo as the sintering aids under flowing argon. The results show that the sub-micron synthesized ZrB2 powders could apparently enhance the sintering process,though the properties of the composites were not obviously improved. The mechanical properties were the best as the synthesized powder was 30wt% of the tota... |
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| Keywords: | ZrB_2-SiC ZrB_2-SiC pressureless sintering mechanical properties microstructure |
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