High Performance Injection Molded Ti Compacts.

Miura, Hideshi; Masuda, Takanori; Ogasawara, Takeshi; Kankawa, Yoshimitsu

doi:10.2497/jjspm.49.825

Cited by 6 publications

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“…Titanium component production by the metal powder injection molding process (Ti-MIM) was the subject of much effort over the past few decades with several reports showing the incremental steps in powders, binders, debinding, sintering, and post-sintering details [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,…”

Section: Introductionmentioning

confidence: 99%

Progress in Titanium Metal Powder Injection Molding

German

2013

Materials

147

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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.

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Section: Introductionmentioning

confidence: 99%

Progress in Titanium Metal Powder Injection Molding

German

2013

Materials

147

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“…[6], we can plot a graph between ln [r/(T max ) 2 ] and -1/RT max from the TGA experiments with several constant heating rates. The slope of this plot gives the apparent activation energy, Q, of the reaction, as shown in Figure 7(b).…”

Section: For a Single Reaction Stepmentioning

confidence: 99%

“…[5], as shown in Figure 7(a); (2) the second step is to determine the apparent activation energies using Eq. [6] for both sigmoids, as shown in Figure 7(b); (3) the third step is to determine the ratio parameter x, the transition temperature T t , and the specific rate constants k 01 and k 02 based on Eqs. [7] and [8], which are listed in Table V; and (4) the final step is to construct MDC using Eqs.…”

Section: For Two Reaction Stepsmentioning

confidence: 99%

“…[1][2][3] Although the world's first PIM Ti component was produced in 1990 by Nippon Tungsten, [2,3] systematic research on Ti PIM had not been reported until the late 1990s. [4][5][6][7][8][9][10] The keys to successful Ti PIM were found to include (a) careful control over impurity elements, especially oxygen; (b) fairly good moldability of Ti powder; and (c) acceptable Ti powder expenses. The presence of excess oxygen in Ti compacts decreased not only the sintered density, but also ductility and toughness.…”

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confidence: 99%

“…[3] To reduce the oxygen concentration in sintered titanium, gas-atomized (GA) Ti powder, which contains a low initial oxygen content, is preferred. [3][4][5][6][7][8]11] The GA Ti powder also possesses good moldability due to its spherical particle shape. However, its use is limited to a few applications because of its high cost.…”

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Rheological and Thermal Debinding Behaviors in Titanium Powder Injection Molding

Park

Heaney

et al. 2008

Metall Mater Trans A

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Powder injection molding (PIM) is suitable for the fabrication of complex shape titanium and its alloys and has a great potential in many applications. This article deals with the injection molding of hydride-dehydride (HDH) titanium powder, spheroidized HDH titanium powder, and gas-atomized (GA) titanium powder. Rheological and thermal debinding behaviors are compared between feedstocks made from the three powders. Torque and capillary rheometers are used to investigate rheological behavior as it relates to the power-law model of viscosity and moldability index. Thermogravimetric analysis (TGA) was employed to analyze debinding behavior given a master decomposition curve consisting of two sigmoids. Spheroidized HDH Ti powder behaves in a manner similar to GA Ti powder. The analysis of the results in this study indicates the possibility of using a combination of HDH and GA titanium powders for PIM.

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Powder-processing linkages to properties for complex titanium shapes by injection molding

German

2015

Titanium Powder Metallurgy

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High Performance Injection Molded Ti Compacts.

Cited by 6 publications

References 0 publications

Progress in Titanium Metal Powder Injection Molding

Progress in Titanium Metal Powder Injection Molding

Rheological and Thermal Debinding Behaviors in Titanium Powder Injection Molding

Powder-processing linkages to properties for complex titanium shapes by injection molding

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