| 莫来石/刚玉复相陶瓷热断裂特性研究 |
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| 引用本文： | 孔德玉,杨辉,王家邦,陈桂华. 莫来石/刚玉复相陶瓷热断裂特性研究[J]. 硅酸盐通报, 2004, 23(5): 32-35 |
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| 作者姓名： | 孔德玉 杨辉 王家邦 陈桂华 |
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| 作者单位： | 浙江大学材料与化工学院,杭州,310027;浙江工业大学,杭州,310014;浙江大学材料与化工学院,杭州,310027 |
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| 摘 要： | 通过调整复相陶瓷中颗粒相的组成与级配,利用引入的热膨胀失配机制,控制莫来石/刚玉复相陶瓷显微结构,改善高温复相陶瓷热稳定性,着重研究了莫来石/刚玉复相陶瓷的热断裂特性.研究表明,全部采用莫来石颗粒相时,由于柱状莫来石颗粒极易发生热冲击穿晶断裂,且热膨胀失配导致的微裂纹较长,密度较小,故复相陶瓷热稳定性较差;全部采用刚玉颗粒相时,虽然基质相裂纹扩展至刚玉颗粒表面时穿晶断裂与沿晶的裂纹扩展同时发生,有利于改善复相陶瓷热稳定性,但由于热膨胀失配过度,未经热冲击时已产生宏观裂纹,故热稳定性最差.而采用莫来石/刚玉复合颗粒相,相比例为75/25制备的复相陶瓷试样,热膨胀失配形成的微裂纹较短,密度较大,其热稳定性最优.
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| 关 键 词： | 热断裂特性 莫来石 刚玉 复相陶瓷, |
Thermal Fracture of Mullite/Corundum Duplex Ceramics |
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| Kong Deyu,Yang Hui,Wang Jiabang,Chen Guihua Dept. of Materials , Chemistry Engineering,Zhejiang University,Hangzhou Zhejiang University of Technology,Hangzhou. Thermal Fracture of Mullite/Corundum Duplex Ceramics[J]. Bulletin of the Chinese Ceramic Society, 2004, 23(5): 32-35 |
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| Authors: | Kong Deyu Yang Hui Wang Jiabang Chen Guihua Dept. of Materials & Chemistry Engineering Zhejiang University Hangzhou Zhejiang University of Technology Hangzhou |
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| Affiliation: | Kong Deyu,Yang Hui,Wang Jiabang,Chen Guihua Dept. of Materials & Chemistry Engineering,Zhejiang University,Hangzhou 310027 Zhejiang University of Technology,Hangzhou 310014 |
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| Abstract: | Microstructure of mullite-corundum duplex ceramics were controlled through adjusting composition andgradation of aggregates to introduce appropriate thermal mismatch in order to improve thermal shock resistance of thementioned ceramics. The results show that the sample made with only mullite aggregate appears relatively longer and fewermicro-cracks due to thermal mismatch, together with easy fracture of mullite aggregate under the thermal shock, whichresulte in inferior thermal shock resistance. The sample made with only corundum aggregate shows the worst thermal shockresistance due to over-mismatch and macro-cracks appeared before thermal shock. While the sample made with 75/25of mullite/corundum composite aggregates appears shorter and denser micro-cracks due to thermal mismatch, whichresult in excellent thermal shock resistance. |
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| Keywords: | thermal fracture mullite corundum duplex.ceramic |
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