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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)。
Titration method, ammonium metatitanate (AMT) saturated solution and titanium carbide (Ti C) powder and dispersant suspension composed of anhydrous ethanol was dripped to obtain AMT-coated titanium carbide precursor; followed by precursor Tungsten-coated TiC composite powders were prepared by high-purity hydrogen reduction. XRD and SEM were used to characterize the composite powders. The bulk samples were prepared by spark plasma sintering (SPS) technique. The morphology of the bulk samples was analyzed by SEM and the relative density and mechanical properties were tested. The results showed that when N, N-methylformamide (DMF) and polyethylene glycol (PEG) were used as the dispersant for the saturated solution of Ti C and AMT, the H 2 reduction was carried out by holding at 600 ℃ for 1 h and holding at 800 ℃ for 30 min, Get decentralized class spherical compound powder. After being sintered at 1600 ℃ for 2 min, TiC was uniformly distributed in the matrix. The relative density of TiCp / W composites was 94.6%, the flexural strength reached 739 MPa, the microhardness reached 4.86 GPa, and the fracture toughness reached 7.87 MPa? M ~ (1/2).