| SiC w/BAS复合材料的显微结构及力学性能的研究 |
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| 引用本文： | 叶枫,周玉,雷廷权,杨觉明,张立同.SiC w/BAS复合材料的显微结构及力学性能的研究[J].无机材料学报,2000,15(3). |
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| 作者姓名： | 叶枫 周玉 雷廷权 杨觉明 张立同 |
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| 作者单位： | 1. 哈尔滨工业大学材料科学与工程学院,哈尔滨,150001
2. 西北工业大学材料科学与工程学院,西安,710072 |
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| 摘 要： | 本文采用热压烧结法制备出致密的SiCw增强BAS玻璃陶瓷基复合材料．结果表明，BAS基体晶化后获得以钡长石为主晶相和莫来石为次晶相的复相BAS玻璃陶瓷．晶须的加入对BAS基体有显著的强韧化效果，加入30vol％SiCw可使材料的室温抗弯强度和断裂韧性分别由基体的156MPa和1．40MPa·m1/2提高到356MPa和4．06MPa·m1/2．TEM观察结果表明，晶须／基体界面结合良好，无界面反应物和非晶层的存在．断口形貌和压痕裂纹扩展路径的SEM观察结果表明，复合材料的主要增韧机制为裂纹偏转、晶须的拔出和桥接．
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| 关 键 词： | BAS玻璃陶瓷 SiC晶须 显微结构 力学性能 |
Microstructure and Mechanical Properties of SiC w/BAS Glass-Ceramic Composites |
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| YE Feng,ZHOU Yu,LEI Ting-Quan,YANG Jue-Ming,ZHANG Li-Tong.Microstructure and Mechanical Properties of SiC w/BAS Glass-Ceramic Composites[J].Journal of Inorganic Materials,2000,15(3). |
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| Authors: | YE Feng ZHOU Yu LEI Ting-Quan YANG Jue-Ming ZHANG Li-Tong |
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| Abstract: | The BAS glass-ceramic composites reinforced with different volume fractions of SiC whiskers were successfully studied by a hot-pressing method. The results show that the BAS matrix is composed of BaAl2Si2O8 and mullite. The incorporation of SiC whiskers can significantly increase the fiexural strength and fracture toughness of BAS glass-ceramics. The flexural strength and fracture strength of 30vol%SiCw/BAS composites can increase 128% and 190% compared to the unreinforced BAS matrix. The main toughening mechanisms are crack deflection, whisker pullout and bridging. The results of TEM observations show that SiC whiskers are directly bonded to the BAS matrix grains with no interfacial glass larer or reaction layer. In addition, the BAS composites also have good elevated temperature mechanical properties. |
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| Keywords: | BAS glass-ceramic SiC whisker microstructure mechanical properties |
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