凝胶注模-真空烧结制备TiC/Fe基钢结硬质合金  

Gelcasting and vacuum sintering process of TiC/Fe steel bonded carbide

作　　者：石永亮[1] 郭志猛[2] 李秀敏[1] 杨晓彩[1] 戚翠芬[1] 

机构地区：[1]河北工业职业技术学院材料工程系,河北石家庄050091 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《粉末冶金工业》2015年第2期20-24,共5页Powder Metallurgy Industry

基　　金：河北省科技计划项目(15211018D);河北省科技指导项目(Z2014042)

摘　　要：采用甲苯/甲基丙烯酸羟乙酯(HEMA)凝胶体系实现了Ti C/Fe基复合粉末的凝胶注模成形,并通过真空烧结制备出复杂形状的钢结合金烧结体,研究了单体含量对坯体和烧结体抗弯强度、密度、硬度及微观组织的影响。结果表明:单体含量直接影响坯体及烧结体的组织及性能,单体的最佳质量分数为4.6%,制备的坯体强度高达28 MPa,经1 420℃真空烧结1 h,制备出烧结体的强度、密度及硬度分别为1 410 MPa、6.46 g/cm3、50 HRC,热处理后,制品的抗弯强度及硬度分别提高到1 670 MPa和65 HRC。Gelcasting in methylbenzene/HEMA system was successfully employed to manufacture Ti C/Fe cemented carbide with complex shape. The effects of monomer content on the structure, density and strength of green and sintered body were analyzed. The results show that the monomer content is the key factor in Ti C/Fe gelcasting process. The optimum monomer（HEMA） content is 4.6%（based on the mass of powder）. With the optimum monomer content, the green strength is 28 MPa. When vacuum sintered at 1 420 ℃ for 1 h, the transverse rupture strength, density and hardness of specimens are 1 410 MPa, 6.46 g/cm3 and 50 HRC, respectively. The transverse rupture strength and hardness reach1 670 MPa and 65 HRC after heat treatment.

关 键 词：钢结合金 凝胶注模 真空烧结 单体 生坯强度 

分 类 号：TF124[冶金工程—粉末冶金]