常压H_2气氛烧结W-TiC合金的致密化行为和性能  

Densification behavior and mechanical properties of W-TiC alloy prepared by pressure sintering in H_2 protective atmosphere

作　　者：张顺[1] 范景莲[1] 成会朝[1] 刘涛[1] 田家敏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2011年第6期900-905,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家杰出青年科学基金资助项目(50925416)

摘　　要：采用粉末冶金方法在常压H2气氛下制备W-TiC合金,研究W-TiC合金的烧结致密化行为,并对合金的性能和组织结构进行分析。结果表明:添加微量强化烧结元素可改善W-TiC合金的烧结活性,在1 700℃烧结120 min后其相对密度达到99.2%;随着烧结温度的升高,W-TiC合金的拉伸强度提高,在2 000℃烧结120 min后,拉伸强度达到464 MPa;TiC颗粒可有效地抑制合金烧结过程中的晶粒长大。A W-6%TiC （mass fraction） alloy was fabricated using Ha as protective atmosphere by powder metallurgy method, the sintering densification behavior, microstructure and mechanical properties of the alloy were investigated in detail. Experimental results show that the W-TiC alloy has high sintering activity with the addition of alloyed elements, the relative density of the alloy can be improved to 99.2% when the composites are sintered at 1 700℃ for 120 min under H2 atmosphere. The tensile strength of W-TiC alloy is about 464 MPa when sintered at 2 000 ℃ for 120 min also under H2 protective atmosphere. The grain size is effectively inhabited by TiC particles.

关 键 词：W-TiC合金 致密化行为 微观组织 力学性能 

分 类 号：TG146.412[一般工业技术—材料科学与工程]