(1. 合肥工业大学 材料科学与工程学院, 合肥 230009；
2. 中国科学院 等离子体物理研究所，合肥230031；
3. 安徽省有色金属材料与加工工程实验室, 合肥 230009)
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。
关键字: 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
（1. School of Material Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
3. Laboratories of Nonferrous Metal Material and Processing Engineering of Anhui Province, Hefei 230009, China）
Abstract: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.
Key words: W-TiC composite powder; wet-chemical process; spark plasma sintering; activation pretreatment; defect
