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Progress in Titanium Metal Powder Injection Molding
Mechanical Engineering, San Diego State University, 5500 Campanile Drive, San Diego, CA 92128, USA
Received: 29 July 2013; in revised form: 8 August 2013 / Accepted: 9 August 2013 / Published: 20 August 2013
Abstract: Metal powder injection molding is a shaping technology that has achieved solid scientific underpinnings. It is from this science base that recent progress has occurred in titanium powder injection molding. Much of the progress awaited development of the required particles with specific characteristics of particle size, particle shape, and purity. The production of titanium components by injection molding is stabilized by a good understanding of how each process variable impacts density and impurity level. As summarized here, recent research has isolated the four critical success factors in titanium metal powder injection molding (Ti-MIM) that must be simultaneously satisfied—density, purity, alloying, and microstructure. The critical role of density and impurities, and the inability to remove impurities with sintering, compels attention to starting Ti-MIM with high quality alloy powders. This article addresses the four critical success factors to rationalize Ti-MIM processing conditions to the requirements for demanding applications in aerospace and medical fields. Based on extensive research, a baseline process is identified and reported here with attention to linking mechanical properties to the four critical success factors.
Keywords: titanium; metal powder injection molding; purity; density; sintering; microstructure; alloying; powder characteristics; particle size; oxygen control
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MDPI and ACS Style
German, R.M. Progress in Titanium Metal Powder Injection Molding. Materials 2013, 6, 3641-3662.
German RM. Progress in Titanium Metal Powder Injection Molding. Materials. 2013; 6(8):3641-3662.
German, Randall M. 2013. "Progress in Titanium Metal Powder Injection Molding." Materials 6, no. 8: 3641-3662.