以γ-AlOOH、TiO2和SiCw为原料,通过反应烧结制备了多孔Al2TiO5-SiCw复合材料,研究了SiCw对Al2TiO5-SiCw复合材料物相、微观组织结构、孔隙率和抗压强度的影响.结果表明:反应产物中主要物相有Al2TiO5、Al6Si2O13、TiC和SiO2.由于晶须分解速度快,SiCw可全部与TiO2反应生成TiC和SiO2.添加SiCw,一方面显著细化了Al2TiO5基复合材料的微观组织,生成的细小规则的TiC晶粒和存在于Al2TiO5晶界处的Al6Si2O13有利于抑制Al2TiO5晶粒长大,提高其抗压强度.另一方面,因为SiCw改变了原料中颗粒之间的堆积方式,使孔径增大、孔隙率显著提高.生成的一定量的SiO2对晶粒产生黏结,使得Al2TiO5基复合材料的孔洞骨架密实,提高了抗压强度,但当SiCw加入量多时,由于出现较多的玻璃相,会降低抗压强度.
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