采用Ti3SiC2与Ti3AlC2粉体和cBN粉体为原料,通过微波烧结制备Ti3SiC2与Ti3AlC2结合剂cBN复合材料,同时研究cBN的含量对该复合材料的物相组成与显微形貌的影响.结果表明,Ti3SiC2-cBN试样烧结后得到了SiC、TiSi2、TiC、TiO、TiO2、SiO2.cBN添加量为10%的复合材料中Ti3SiC2分解较为严重.试样烧结后基体组织比较细小,只有几微米.当原料中cBN含量为20%时,cBN表面会形成凹凸不平的组织.Ti3AlC2-cBN试样烧结后得到了Ti2 AlC、TiC、Ti、Al、Al2 O3,Ti3 AlC2材料分解完全.cBN含量较高时,它可以与Ti3AlC2或其分解产物充分反应,形成相应的氮化物或碳氮化物.
Ti3SiC2 and Ti3AlC2 ceramic boned cBN composites were fabricated by microwave sintering from Ti3 SiC2 ,Ti3AlC2 and cBN raw powders.The effect of cBN′s content on phase and micro-structure of composites were also studied.The result shows that SiC,TiSi2 ,TiC,TiO,TiO2 ,SiO2 could be synthesized after microwave sintering of Ti3 SiC2-cBN samples.When cBN content was 10%,Ti3 SiC2 was decomposed seriously.The phase organization was finer with a size of about several micrometer.When cBN content was 20%,irregularity organization were formed on the surface of Ti2 AlC,TiC,Ti,Al,Al2 O3 could be synthesized after microwave sintering of Ti3 AlC2-cBN samples. Ti3AlC2 was decomposed totally.When cBN content was higher,it can react with Ti3AlC2 or its decomposed products fully to form nitride or carbonitride.
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