以β-SiAION粉料为晶种,SiC为基体,加入Si粉、AI粉和Al2O3粉在1900 K氮气气氛下合成β-SiAlON晶须,研究了晶须的显微结构、相组成和晶须增韧SiC复合材料的力学性能,并结合热力学研究了晶须的生长机制.结果表明:(1)以β-SiAlON粉料为诱导晶种时可以合成β-SiMON晶须材料,其生长机制为VLS机制和VS机制；(2)当以VLS机制生长时,晶须合成z值为1.56,直径约为200 -300nm,呈柱状和纤维状,当以VS机制生长时,晶须合成z值为1.76,直径为0.5～1.5 μm,呈柱状和竹节状,发育较为规则；(3)晶须相可有效提高复合材料的力学性能,相同组成的复合材料中,当β-SiAlON晶须相的含量较高时,材料可以在气孔率较高(32.1％)条件下获得了较好的抗折强度(55.2 MPa).
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