W-TiC合金的烧结行为及其显微组织演变  

Sintering behavior and microstructure evolution of W-TiC alloy

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

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2012年第8期2938-2942,共5页Journal of Central South University:Science and Technology

基　　金：国家杰出青年科学基金资助项目(50925416)

摘　　要：采用粉末冶金方法制备W-TiC合金,研究W-TiC合金的烧结行为,并对合金的显微组织演变进行分析。结果表明：W-TiC合金粉末具有高的烧结活性,合金致密化过程主要发生在1 500~1 800℃,经1 800℃常压烧结120 min后,合金相对密度即达97.5%;当温度提高至1700℃甚至更高温度后,合金显微组织均匀性明显改善;在高温烧结过程中,添加TiC与W形成（W,Ti）C固溶体以及含W,Ti,C和O元素的复合物粒子相,均匀分布在W基体中,有效地抑制了W晶粒长大,提高了合金性能;在1 950℃烧结120 min后,其相对密度为98.1%,显微硬度达最大值HV670.4,相对纯W提高29.3%。A W-TiC alloy was fabricated by powder metallurgy method, and the sintering densification behavior and microstructure evolution of the alloy were investigated. Experimental results show that the W-TiC alloy has high sintering activity, and the main densification behavior happens during 1 500-1 800 ℃, the relative density of the alloy is 97.5% after being sintered at 1 800 ℃ for 120 rain in H2. The microstructure uniformity of the alloy is significantly improved when the sintering temperature exceeds 1 700 ℃. During high temperature sintering process, （W,Ti）C and the particle containing elements W, Ti, C and O form by adding TiC, which can effectively inhabit grain growth and improve the mechanical properties（hardness） of the alloy. The relative density is 98.1%, and the highest microhardness is HV 670.4 after being sintered at 1 950 ℃ for 120 min in H2, which is 29.3% higher in comparison with pure tungsten.

关 键 词：W-TiC合金 烧结行为 显微组织 显微硬度 

分 类 号：TG146.411[一般工业技术—材料科学与工程]