摘要
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 investigate the effects of ceramic additives on the properties of Ti3SiC2 matrix composites,Ti3SiC2 material as well as SiC/Ti3SiC2,Al2O3/Ti3SiC2 and MgAl2O4/Ti3SiC2 composites whose ceramic additive contents were 30wt% were fabricated by reactived hot pressing sintering method firstly.Then,the mechanical properties and conductivities of the materials were tested,the oxidation resistance of Ti3SiC2 matrix composites was investigated in the temperature range of 1 373-1 773 K,and the phase compositions and microstructures of sintering samples were characterized.The results show that the main products of Ti3SiC2 after high temperature oxidation are TiO2 and SiO2.The oxidation layer can be divided into two layers of inner and outer,the inner layer consists by two-phase mixture of TiO2 and SiO2,and the outer layer is TiO2.A large number of apparent pores exist in oxide layers and the structure is relatively loose,which leads to the poor oxidation resistance.Comparing with Al2O3/Ti3SiC2 and MgAl2O4/Ti3SiC2 composites,SiC/Ti3SiC2 composite has better oxidation resistance.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2016年第2期350-357,共8页
Acta Materiae Compositae Sinica
基金
国家自然科学基金青年基金(51302206)