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为研究陶瓷添加物对Ti3SiC2基复合材料性能的影响,首先,采用反应热压烧结法制备了Ti3SiC2材料及陶瓷添加物含量均为30wt%的SiC/Ti3SiC2、Al2O3/Ti3SiC2和MgAl2O4/Ti3SiC2复合材料。然后,测试了材料的力学性能和导电性,在1 373~1 773K温度范围内对Ti3SiC2基复合材料的抗氧化性进行了研究,并对其烧结试样的物相组成和显微结构等进行了表征。结果表明:Ti3SiC2在高温氧化后的主要产物为TiO2和SiO2;氧化层分为内外2层,内层由TiO2与SiO2这2相混合组成,外层为TiO2;氧化层中存在大量显气孔,结构较为疏松,导致抗氧化性较差。与Al2O3/Ti3SiC2和MgAl2O4/Ti3SiC2复合材料相比,SiC/Ti3SiC2复合材料具有更好的抗氧化性。
In order to study the effect of ceramic additives on the properties of Ti3SiC2 matrix composites, first, Ti3SiC2 and SiC / Ti3SiC2, Al2O3 / Ti3SiC2 and MgAl2O4 / Ti3SiC2 composites with 30wt% ceramic additives were prepared by reactive hot pressing. Then, the mechanical properties and electrical conductivity of the composites were tested. The oxidation resistance of the Ti3SiC2 matrix composites was investigated in the temperature range of 1 373 ~ 1773K. The phase composition and microstructure of the sintered samples were also studied. Characterization. The results show that the main products of Ti3SiC2 after high temperature oxidation are TiO2 and SiO2; the oxide layer is divided into two layers inside and outside, the inner layer is composed of two phases of TiO2 and SiO2 and the outer layer is TiO2; a large number of pores are formed in the oxide layer, More loose, leading to poor oxidation resistance. Compared with Al2O3 / Ti3SiC2 and MgAl2O4 / Ti3SiC2 composites, SiC / Ti3SiC2 composites have better oxidation resistance.