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ZTM/SiC_p复相陶瓷的力学性能与显微结构分析 被引量:2

A Study on ZrO_2 -Toughened Mullite Ceramic Strengthened by Dispersed SiC Particulates
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摘要 本文采用热压工艺制备莫来石一氧化锆一碳化硅(ZTM/SiCp)复相陶瓷;研究了分散相SiC粒子的添加量和粒径对氧化锆增韧莫来石(ZTM)陶瓷力学性能的影响.实验结果表明:SiC添加量在10~30vol%范围之内,材料力学性能有显著提高,其断裂韧性比ZTM材料要提高89%,达8.5Mpa^(1/2),弯曲强度要提高91%左右,达680MPa;通过对断口进行观察,细SiC粒子强韧ZTM陶瓷主要是通过裂纹钉扎和偏转来实现的.当添加一定量较大粒径(7.0um)的SiC粒子时,材料的室温韧性高达9.1Mpam^(1/2),强度未见明显下降.粗SiC粒子的引入导致适度微裂纹的生成,可能是材料韧性显著提高的主要原因. Mullite -ZrO2(2. 0 mol% Y2O3) - SiCp ceramic composites were fabricated by hot-pressing technique. The effects of SiC content on the mechanical properties of ZrO2 - toughened mullite ceramic was discussed in this paper. The experiment results showed that the hot - pressing densification temperature, fracture toughness and flexural strength of the composites increased with the increase of the fine SiC (1. 0μm in average) content from 10 to 30 vol%. The toughness and strength,i. e 8. 5MPam1/2 and 680MPa,were given to the composite containing 30vol % SiC particulates which were 89% and 91% higher than those of ZTM without S O particulates. The main strengthing and toughening mechanisms of incorporation of fine SiC particulates result from crack pinning and crack deflection. The fracture toughness of the composite with SiC particulates of 7. 0 μm reached a high value of 9. IMPam1/2 ,but the stength was almost the same as the others. The possible explanation could be. attributed to the developed microcraking caused by the thermal mismatch and the difference of Yong's modulus due to the addition of large SiC particles.
出处 《硅酸盐通报》 CAS CSCD 北大核心 1994年第4期4-7,共4页 Bulletin of the Chinese Ceramic Society
关键词 碳化硅 莫来石 复相陶瓷 陶瓷 性能 silicon carbide, composite, mullite , hot - pressing.
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