(1. 合肥工業(yè)大學 材料科學與工程學院, 合肥 230009；
2. 中國科學院 等離子體物理研究所，合肥230031；
3. 安徽省有色金屬材料與加工工程實驗室, 合肥 230009)
摘 要: 采用濕化學法制備W-TiC復合粉體，然后采用放電等離子體燒結(SPS)技術制備超細晶W-TiC復合材料，并對其復合粉體形貌和燒結復合材料組織結構進行研究。結果表明，對原始TiC粉進行活化預處理，使TiC粉表面獲得均勻分布的缺陷，提高TiC粉表面的的親水性，通過化學還原獲得第二相TiC顆粒，且均勻彌散分布于W基體晶界和晶粒內。采用SPS燒結技術獲得的超細晶W-TiC復合材料晶粒尺寸為400 nm，致密度為95%，維氏顯微硬度值HV0.2達到1280。
關鍵字: W-TiC復合粉體；濕化學法；放電等離子體燒結；活化預處理；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
