Catalytic debinding and sintering process of metal injection molding used by Ti/TiH2
YAO Yincheng1, QIU Yaohong2, XIAO Zhiyu1
1. National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China; 2. Guangdong Chaoyi Metal Industry Co., Ltd., Chaozhou 515632, China
Abstract：In order to solve the problem of titanium processing and reduce the processing cost, cheap TiH2 powders were mixed with spherical titanium powders with different mass proportions to form Ti/TiH2 composite titanium powders, which were mixed with polyoxymethylene-based binder for catalytic debiuding and sintering process of metal injection molding. In the research of catalytic debinding process, by comparing the debinding rate of the four groups of injection blanks at different debinding temperatures and time, it was determined that the optimal catalytic debinding temperature was 120 ℃ and the best debinding time was 5 hours. Under these conditions, the debinding rate of the four groups of injection blanks all exceeded 85%, reaching the expected catalytic debinding target. In the sintering process research, the shrinkage, density and tensile strength of the four groups of debinding blanks at different sintering temperatures were studied, and the optimal sintering temperature was 1 250 ℃. Under the sintering condition of 1 250 ℃ for 2 h, with the increase of the proportion of TiH2, the comprehensive mechanical properties of the sintered samples decrease. The sintered sample with Ti and TiH2 mass proportions of 4:1 has good comprehensive mechanical properties, with a tensile strength of 649 MPa, a hardness of 241 HV, and an elongation of 6.9%. The TiH2 powder can effectively reduce costs, and has a good industrial application prospect. It is of great significance to the wide application of titanium and titanium alloys.
姚尹城, 邱耀弘, 肖志瑜. Ti/TiH2注射成形的催化脱脂及烧结工艺[J]. 粉末冶金材料科学与工程, 2021, 26(4): 355-362.
YAO Yincheng, QIU Yaohong, XIAO Zhiyu. Catalytic debinding and sintering process of metal injection molding used by Ti/TiH2. Materials Science and Engineering of Powder Metallurgy, 2021, 26(4): 355-362.
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2021, Vol. 26 
