研究了碳的添加量为6wt％条件下,添加碳源的种类及添加比例对制备的无压固相烧结碳化硅陶瓷的微观结构和性能的影响.结果表明:采用纯无机碳源(碳黑),制备的碳化硅陶瓷具有较为细小的碳化硅晶粒结构,但致密度较低；添加有机碳源(酚醛树脂)时,随着其裂解碳添加量的增加,碳化硅的晶粒逐步长大,碳在材料中的分布更加均匀,材料的致密度提高,力学性能增强.当有机碳源裂解碳添加量达3wt％时,材料的致密度最高,并具有最大的弹性模量468 GPa,断裂韧性达4.65 MPa·m1/2.当有机碳源裂解碳添加量大于3wt％时,碳化硅晶粒发生局部异常长大现象,材料的弯曲强度与断裂韧性进一步增加.同时,对材料的热扩散系数随碳源添加种类和比例变化的规律也进行了分析与讨论.
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