Effect of titanium hydride powder addition on microstructure and properties of titanium powder injection molding

Titanium hydride powder was used to completely or partly replace the spherical titanium powder in order to reduce the cost. The microstructure and mechanical properties after debinding and sintering were investigated. The results showed that with the addition of the titanium hydride powder, the microstructure gradually changed. The fabricated alloy was a titanium matrix composite reinforced with in-situ TiC particles. With the increase in the proportion of titanium hydride powder, the catalytic debinding percentage decreased, which led to an increase in the concentration of carbon and oxygen, and hence, there was a decrease in the tensile strength and elongation though the density of titanium MIM samples increased. The hardness and wear resistance increased as compared with those for pure titanium materials in the market. These results provide a promising method for reducing the cost of titanium MIM, and development of great industrial application prospects. (C) 2020 Elsevier B.V. All rights reserved.