摘要
采用反应热压烧结法制备Ti3SiC2-Al2O3复合材料,研究热压温度和Al2O3含量对Ti3SiC2-Al2O3复合材料相组成、力学性能及抗氧化性能的影响。结果表明:采用反应热压烧结,可以在1450℃烧结得到致密度高、性能良好的Ti3SiC2-Al2O3复合材料。添加Al2O3可以起到第二相增强的作用,从而提高材料的强度。随着添加量的增加,复合材料的力学性能先提高后降低,当Al2O3添加量为20%(质量分数)时断裂韧性达最大值(7.10 MPa-m1/2),当Al2O3添加量为30%时抗弯强度达最大值(512 MPa)。Al2O3在高温下与TiO2反应生成具有耐高温和高抗热震性能的Al2Ti O5,可以有效提高Ti3SiC2基复合材料高温抗氧化性能。
Ti3SiC2-Al2O3 composites were prepared by reactive hot-pressed sintering. The effects of the Al2O3 content and hot pressing temperature on the phase constituent,mechanical properties and oxidation resistance property of Ti3SiC2-Al2O3 composites were investigated. The results show that the Ti3SiC2-Al2O3 composites with high density and good properties can be prepared by reactive hot-pressed sintering at 1450 ℃. The Al2O3 addition has the effect of the second phase strengthening which can improve the strength of the material. The mechanical properties of Ti3SiC2-Al2O3 composites increase firstly and then decrease with increasing Al2O3 content, the fracture toughness reaches the maximum value (7.10 MPa?m1/2) when the mass fraction of Al2O3 is 20%, and the bending strength reaches the maximum value (512 MPa) when the mass fraction of Al2O3 is 30%. Al2O3 reactes with TiO2 under high temperature, generating Al2TiO5 with high temperature resistance and high thermal shock resistance, which can effectively improve the oxidation resistance of Ti3SiC2 composites.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2015年第4期997-1004,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金青年基金资助项目(51302206)
