Preparation of Ti-6Al-4V feedstock for titanium powder injection molding

Lin, Dongguo; Chung, Sung Taek; Kwon, Young Sam; Park, Seong Jin

doi:10.1007/s12206-016-0343-y

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…Detailed information about the binder is shown in Table 2. Physical properties of the binder were determined from the reference [32].…”

Section: Methodsmentioning

confidence: 99%

“…Critical solid loading was evaluated by measuring mixing torque at various solid loading ranges with a HAAKE PolyLab QC. A dramatic increase in mixing torque occurs after critical solid loading [32]. The copper powder and the binder system were mixed with slightly less solid loading than the critical solid loading in order to facilitate the injection molding process [32].…”

Section: Methodsmentioning

confidence: 99%

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Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

et al. 2019

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In this study, two kinds of copper micro-patterned surfaces with different heights were fabricated by using a powder injection molding (PIM) process. The micro-pattern’s size was 100 μm, and the gap size was 50 μm. The short micro-pattern’s height was 100 μm, and the height of the tall one was 380 μm. A copper powder and wax-polymer-based binder system was used to fabricate the micro-patterned surfaces. The critical heat flux (CHF) and heat transfer coefficient (HTC) during pool-boiling tests were measured with the micro-patterned surfaces and a reference plain copper surface. The CHF of short and tall micro-patterned surfaces were 1434 and 1444 kW/m2, respectively, and the plain copper surface’s CHF was 1191 kW/m2. The HTC of the plain copper surface and the PIM surface with short and tall micro-patterned surfaces were similar in value up to a heat flux 1000 kW/m2. Beyond that value, the plain surface quickly reached its CHF, while the HTC of the short micro-patterned surface achieved higher values than that of the tall micro-patterned surface. At CHF, the maximum values of HTC for the short micro-pattern, tall micro-pattern, and the plain copper surface were 68, 58, and 57 kW/m2 K.

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“…Detailed information about the binder is shown in Table 2. Physical properties of the binder were determined from the reference [32].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

et al. 2019

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“…After mixing, the mixture was cooled down to room temperature and crushed, which served as the feedstock. The dynamic viscosity () is measured for each feedstock to determine the suitable pressure and temperature for the injection molding machine [7,19]. Too low temperature could lead to a denser viscosity that would result in an incomplete die fulfilment; On the other hand, too high temperature could lead to diluter viscosity that would induce the two-phase separation of powers and binders resulting in macroscopic crack and residual flash.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…PIM, as a forming technique for high temperature alloys, has been paid great attention due to its high potential for producing complex shapes with large quantities and at low cost [6]. PIM has several steps beginning with the mix of metal powder with a polymer, followed by molding the mixed feedstock into shaped parts, going to removing the polymer, and finally the sintering process which aims at densifying the powder and removing most of the void space left by the binders [7][8]. The compact obtained, after PIM process, consists of solid particles held together by binder phase, without pores, where solid particles are in point contact and the binder forms a continuous network throughout the compact.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of different alloys during thermal debind-ing of powder injection molded parts

El-Garaihy

Nassef

El-Hadek

2016

IJET

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Powder injection molding (PIM) is an interesting technique and address of research, in which a thermoplastic polymeric material is used to form the powder into the desired shape in a closed die. Binders have a crucial importance in the powder metallurgy technology as they play a vital role to provide efficient powder agglomeration and/or lubrication during shaping. At the same time, they have to be easily removed from the compacts during initial stages of sintering, using debinding process, without any damaging effect for the base material. Thermal debinding is a vital process requiring somewhat elevated temperatures to remove binder from the compact. In the current study, an investigation has been made about the effect of process variables on the debinding of injection molded pieces, by melt wicking. The debinding process was performed at temperatures ranging from 160-up to-200°C for a time duration varying from 1-up to-27 hours. All powders used in injection molding feedstock have an inherent packing porosity. Several types of alloy powders (Carbonyl iron steel, Nickel aluminide, and 316L stainless powders), with various size distributions, particle shapes, and materials are adopted to define the influence on binder incorporation resulted from this inherent porosity. Results revealed that the increase of debinding time or decrease in the wicking powder (alumina) particle size lead to an increase in the thickness of the adhered layer of alumina. When the wicking powder is very fine (0.3 m) or has a wide particle size range (<10 m), it becomes more dense and its debinding efficiency is decreased. At high debinding temperatures (200 °C) the rate of binder evaporation and removal increased, which leads to decreasing the cohesion of the samples yielding a shape distortion. In addition, the effect of the wicking powder (Al 2 O 3 ) sizes and debinding time on the binder weight loss percentage after debinding process for FeOX, Ni 3 Al, and 316L has been investigated.

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“…Rheological and thermal properties of a feedstock are two important criteria for powder injection molding and debinding. [6][7][8][9][10] Ti-alloys were used as an alternative to stainless steel. This is because of the high corrosion resistance and biocompatibility of Ti-alloys.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and simulation of feedstock for titanium-powder injection-molding cortical-bone screws

Urtekin¹,

Genç²,

Bozkurt³

2019

Mater. Tehnol.

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Titanium-powder injection molding is a combination of plastic injection and powder metallurgy. Using this technology, near-net titanium parts are produced. In this study, feedstock-development experiments were performed with Ti-6Al-4V powders and binders for the production of titanium cortical-bone screws. Critical solid-loading and optimum solid-loading values were determined to specify the most appropriate binder system and ratio by volume. The critical solid-loading rate was determined as 62 % by volume while the optimum solid-loading rate was 60 % by volume. The rheological properties of the feedstocks were obtained with a capillary rheometer, and the thermal properties with a TGA analysis. The rheological behavior and thermal properties of PW/PE/SA and PEG8000/PP/SA feedstocks at different mixing ratios were determined. A simulation of the flow was made with the Moldflow program, designing a screw and a mold. For the two different feedstocks, skeletal binders PP and PE were identified and simulations were carried out. The knowledge that the feedstock skeletal-binder properties predominate was obtained as the data for the flow in the mold in the light. Experiments and simulations showed that the water-based feedstock is a suitable binder system for the cortical-bone screw molding.

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Preparation of Ti-6Al-4V feedstock for titanium powder injection molding

Cited by 19 publications

References 7 publications

Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

Fabrication of Micro-Patterned Surface for Pool-boiling Enhancement by Using Powder Injection Molding Process

Comparative study of different alloys during thermal debind-ing of powder injection molded parts

Fabrication and simulation of feedstock for titanium-powder injection-molding cortical-bone screws

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