湿化学法制备W-TiC复合粉体及其SPS烧结行为  

Synthesis of W-TiC composite powders by wet-chemical process and its sintering behavior by SPS

作　　者：丁孝禹[1] 罗来马[1,2] 黄丽枚[1] 罗广南[3] 李萍[1,2] 朱晓勇[1,2] 吴玉程[1,2] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]安徽省有色金属材料与加工工程实验室,合肥230009 [3]中国科学院等离子体物理研究所,合肥230031

出　　处：《中国有色金属学报》2014年第10期2594-2600,共7页The Chinese Journal of Nonferrous Metals

基　　金：国际热核聚变实验堆(ITER)计划专项资助项目(2014GB121001;2010GB109004);中央高校基本科研业务费专项资金资助项目(2013HGCH0011)

摘　　要：采用湿化学法制备W-TiC复合粉体,然后采用放电等离子体烧结(SPS)技术制备超细晶W-TiC复合材料,并对其复合粉体形貌和烧结复合材料组织结构进行研究。结果表明,对原始TiC粉进行活化预处理,使TiC粉表面获得均匀分布的缺陷,提高TiC粉表面的的亲水性,通过化学还原获得第二相TiC颗粒,且均匀弥散分布于W基体晶界和晶粒内。采用SPS烧结技术获得的超细晶W-TiC复合材料晶粒尺寸为400 nm,致密度为95%,维氏显微硬度值HV0.2达到1280。W-TiC composite powders were prepared by wet-chemical process, and ultra-fine grained W-TiC composites were fabricated by spark plasma sintering （SPS）. The surface morphologies of W-TiC composite powders and the microstructure of W-TiC composites were studied. The results show that TiC powders are subjected to chemical activation pretreatment to obtain uniform distribution of defects on the surface of TiC powder, thus increasing the hydrophilicity of the TiC surface. The second phase TiC particles are homogeneously and dispersively distribute in the grains and grain boundaries by chemical reduction. The grain size, relative density and the Vicker hardness HV0.2 of the ultra-fine grained W-TiC composites by SPS are 400 nm, 95% and 1280, respectively.

关 键 词：W-TiC复合粉体 湿化学法 放电等离子体烧结 活化预处理 缺陷 

分 类 号：TG146.4[一般工业技术—材料科学与工程]