加入SiC、SiAlON对刚玉-SiC-SiAlON材料组成、结构和力学性能的影响  

Effects of SiC,SiAlON Addition on Phase Composition,Microstructure and Strength Properties of Al_2O_3-SiC-SiAlON Material

作　　者：刘新红[1] 陈花朵[1] 叶方保[1] 钟香崇[1] 

机构地区：[1]郑州大学高温功能材料河南省重点实验室,郑州450052

出　　处：《硅酸盐通报》2008年第4期715-720,共6页Bulletin of the Chinese Ceramic Society

基　　金：河南教育厅自然科学研究资助项目(2008A430017)

摘　　要：以刚玉和8％Si粉为原料，1500℃埋碳烧后得刚玉-SiC—SiAlON复合材料。本文研究在加入8％Si粉基础上，另加入0～10％SiC或SiAlON粉对刚玉．SiC—SiAlON复合材料组成、结构和力学性能的影响。结果表明：加入SiC或SiAlON首先可促进Si反应完全，生成更多非氧化物使试样微膨胀量增加，重量增加；同时使试样的显气孔率提高，常温抗折强度降低；加入SiC使试样的结构疏松，高温力学性能下降；但由于生成较多O＇-SiAlON以及气孔率提高使试样的抗热震性明显提高；加入SiAlON，试样中生成较多的SiC，并有粒状的β-SiAlON存在，可明显提高试样的高温力学性能。Al2O3-SiC-SiAlON material has been prepared by using corundum and 8% Si as starting materials fired at 1500 ℃ in carbon-embedded condition. The effects of SiC, SiAlON addition on phase composition, microstructure and strength properties of Al2O3-SiC-SiAlON material have been investigated by adding 0 - 10% SiC or SiAlON in this paper. The results show： （ 1 ） The addition of SiC or SiAlON may promote Si reaction completely and more nonoxides is produced, which lead to expansion and weight gain of specimens; （2） The apparent porosity increases and cold modulus of rupture decrease with addition of SiC or SiAlON; （3） High-temperature mechanical properties of this material decreases with addition of SiC because the structure is loose; whereas, thermal shock resistance is improved noticeably due to formation of O＇-SiAlON and higher porosity. The high-temperature mechanical properties of this material are increased with addition of SiAlON due to the in-situ formation of fiberous SiC and granular β-SiAlON.

关 键 词：SIC SIALON 刚玉-SiC—SiAlON材料 高温力学性能 抗热震性 

分 类 号：TQ175.711[化学工程—硅酸盐工业]