摘要
通过放电等离子体烧结(SPS)工艺制备TiC-SiC复合陶瓷,利用XRD、SEM、压痕法等测试手段表征烧结后复合陶瓷的相组成、微观形貌、力学性能。从TiC晶粒大小、SiC的分布状态、样品的维氏硬度和断裂韧性等方面研究了亚微米级SiC对TiC陶瓷基体显微结构和力学性能的影响。结果表明,SiC的添加提高了TiC基体的断裂韧性,细化了TiC晶粒。利用弥散强化和残余应力解释了断裂韧性改善的原因。
Crystalline phase composition, microstructure and mechanical properties of TiC-SiC composites by spark plasma sintering (SPS) were characterized by XRD, SEM and indentation method, respectively. The effect of the distribution of sub-micron SiC on the microstructure in terms of grain size evolution and mechanical properties was also investigated. The results show that the enhanced fracture toughness of TiC and homogeneous microstructures are obtained with the addition of sub-micron SiC. The mechanism of the enhanced toughness was also discussed according to the dispersion strengthened theory and residual stresses.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第S1期293-296,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(91026008)
