以碳化硅颗粒为骨料,以滑石粉、苏州土和α-Al2O3粉为基质并适量加入Al2O3-SiO2陶瓷纤维,通过原位反应合成法制备了堇青石结合碳化硅复相材料,研究了纤维加入量(质量分数O～10％)对该复相材料性能的影响.结果表明:该复相材料的主晶相为碳化硅和堇青石,当Al2O3-SiO2陶瓷纤维质量分数小于8％时,纤维与基体结合紧密,分散较好;随纤维加入量的增加,复相材料的抗折强度先增大后降低,抗热震性能则逐渐提高;当纤维质量分数为8％时,复相材料的抗折强度最大,达33 MPa,其综合性能良好.
Cordierite bonded SiC composite materials were in-situ synthesized by using silicon carbide particles as aggregate,with talc powder,clay and α-Al2 Oa powder as matrix materials,and introducing appropriate Al2O3-SiO2 ceramic fiber.The effect of fiber addition on properties of the composite material was studied.The results show that the composite material was mainly composed of SiC and cordierite.With the Al2O3-SiO2 ceramic fiber mass fraction of 8％,the fiber combined with the matrix closely and distributed well.With the increase of fiber addition,the flexural strength of the composite material first increased then decreased,while the thermal shock resistance increased.When the fiber mass fraction was 8％,the composite material reached the largest flexural strength of 33 MPa and had relatively good comprehensive properties.
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