中文摘要：

采用滴定法,在偏钨酸铵（AMT）饱和溶液与碳化钛（Ti C）微粉和分散剂组成的悬浮液中,滴入无水乙醇获得AMT包覆碳化钛前驱体;然后对前驱体进行高纯氢还原制备出钨包覆Ti C复合粉体,对复合粉体进行了XRD物相和SEM形貌分析。采用放电等离子体烧结（SPS）技术制得块体样品,对其进行了SEM形貌分析,并测试了其相对密度和力学性能。结果表明,当N,N-甲基甲酰胺（DMF）和聚乙二醇（PEG）作为Ti C与AMT饱和溶液的分散剂时,经600℃保温1 h和800℃保温30 min H_2还原,得到分散良好的类球形复合粉体。在1600℃,保温2 min,SPS烧结后,Ti C在基体中分布均匀,Ti Cp/W复合材料的相对密度达到94.6%,抗弯强度达到739 MPa,显微硬度达到4.86 GPa,断裂韧性达到7.87 MPa？m~（1/2）。

英文摘要：

The precursor of ammonium metatungstate（AMT） coated titanium carbide（Ti C） was prepared by a titration method, in which the suspension composed of the saturated solution of AMT, Ti C micropowder and the dispersants was titrated with the anhydrous ethanol. The as-synthesized precursor was reduced in high-purity hydrogen atmosphere and then the tungsten coated Ti C composite powder was prepared.The as-prepared powder was characterized by XRD and SEM. The precursor was reduced in the high-purity hydrogen atmosphere at 600 °C for 1 h and 800 °C for 30 min. And the bulk samples were prepared by spark plasma sintering（SPS） and their SEM morphology, relative density and mechanical properties were investigated. The results show that the well-dispersed globular-like composite powders are produced when N,N-dimethyl formamide（DMF） and PEG are used as the dispersant for Ti C and saturated solution of AMT. When the samples are sintered by spark plasma sintering（SPS） at 1600 °C for 2 min, Ti C particles are uniformly distributed in the matrix W, whose relative density,flexural strength, micro-hardness and fracture toughness of the samples achieve 94.6 %, 739 MPa, 4.86 GPa and 7.87 MPa·m（1/2）, respectively.,