Design of water debinding and dissolution stages of metal injection moulded porous Ti foam production

Shbeh, Mohammed; Goodall, Russell

doi:10.1016/j.matdes.2015.08.018

Cited by 19 publications

(18 citation statements)

References 27 publications

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“…However, because of the high processing costs and difficulties informing them, the development and application of titanium-based porous materials are limited. Methods for fabricating porous titanium include applying space holders [6][7][8], but MIM has its unique advantages. It is a novel near-net-shape technology, which has the unique advantage of forming components of complex shapes.…”

Section: Introductionmentioning

confidence: 99%

Influencing Factors for the Microstructure and Mechanical Properties of Micro Porous Titanium Manufactured by Metal Injection Molding

Zhou

Huang

Jiang

et al. 2016

Metals

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Porous titanium is a new structural and functional material. It is widely used in many fields since it integrates the properties of biomaterials with those of metallic foam. A new technology that combines both the preparation and forming of porous materials has been proposed in this paper. Moreover, a new solder was developed that could be employed in the joining of porous materials. Influencing factors for microstructure and mechanical properties of the parent material and joint interface are identified. Metal injection molding (MIM) technology was used for fabricating porous materials. The feedstock for injection molding of porous titanium powders was prepared from titanium powders and a polymer-based binder system. In addition, the proportion of powder loading and binders was optimized. Through MIM technology, a porous titanium filter cartridge was prepared. For the purpose of investigating the thermal debinding technology of the filter cartridge, effects of the sintering temperature on the porosity, morphology of micropores and mechanical properties were analyzed. It could be found that when the sintering temperature increased, the relative density, bending and compression strength of the components also increased. Moreover, the porosity reached 32.28% when the sintering temperature was 1000˝C. The microstructure morphology indicated that micropores connected with each other. Meanwhile, the strength of the components was relatively high, i.e., the bending and compression strength was 65 and 60 MPa, respectively. By investigating the joining technology of porous filter cartridges, the ideal components of the solder and pressure were determined. Further research revealed that the micropore structure of the joint interface is the same as that of the parent material, and that the bending strength of the joint interface is 40 MPa.

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Section: Introductionmentioning

confidence: 99%

Influencing Factors for the Microstructure and Mechanical Properties of Micro Porous Titanium Manufactured by Metal Injection Molding

Zhou

Huang

Jiang

et al. 2016

Metals

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“…Two different temperatures were tested, 50˝C and 60˝C, and the test were made during 24 h and 48 h because these conditions correspond to removal of the entire PEG from the feedstock made with the PP. Another test was made using a magnetic stirrer in the water bath [16,18]. To compare the result with the previous test, the same temperature and time were studied.…”

Section: Methodsmentioning

confidence: 99%

Development and Characterization of a Metal Injection Molding Bio Sourced Inconel 718 Feedstock Based on Polyhydroxyalkanoates

Royer

Barrière

Gelin

2016

Metals

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Abstract:The binder plays the most important role in the metal injection molding (MIM) process. It provides fluidity of the feedstock mixture and adhesion of the powder to keep the molded shape during injection molding. The binder must provide strength and cohesion for the molded part and must be easy to remove from the molded part. Moreover, it must be recyclable, environmentally friendly and economical. Also, the miscibility between polymers affects the homogeneity of the injected parts. The goal of this study is to develop a feedstock of superalloy Inconel 718 that is environmentally friendly. For these different binders, formulations based on polyethylene glycol (PEG), because of his water solubility property, and bio sourced polymers were studied. Polyhydroxyalkanoates (PHA) were investigated as a bio sourced polymer due to its miscibility with the PEG. The result is compared to a standard formulation using polypropylene (PP). The chemical and rheological behavior of the binder formulation during mixing, injection and debinding process were investigated. The feedstock was characterized in the same way as the binders and the interactions between the powder and the binders were also studied. The results show the well adapted formulation of polymer binder to produce a superalloy Inconel 718 feedstock.

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“…8; first a feedstock is prepared by mixing Ti powder with a polymeric binder and space holder, which is then granulated by extruding and cutting into small pellets; secondly the feedstock is injected at a relatively low temperature and pressure into a die cavity which imparts the desired shape; thirdly the space holder and binder are removed by different techniques (thermally or with a solvent) depending on their nature; finally, the porous green part is partially densified by sintering [61,72] . Although relatively little employed in comparison to the other space holder methods (due to the charge volume required for most injection moulding systems precluding small scale research production), the method has been used to produce commercially pure Ti with a total porosity of up to 71% [56] .…”

Section: Metal Injection Moulding With Space Holder (Mim-sh)mentioning

confidence: 99%

Open Celled Porous Titanium

Shbeh

Goodall

2017

Adv Eng Mater

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[**] One of the authours (MMS) would like to acknowledge a studentship from the Iraqi Ministry of Higher Education and Scientific Research.Among the porous metals, those made of titanium attract particular attention due to the interesting properties of this element. This review examines the state of research understanding and technological development of these materials, in terms of processing capability, resultant structure and properties and the most advanced applications under development. The impact of the rise of additive manufacturing techniques on these materials is discussed, along with the likely future directions required for these materials to find practical applications on a large scale.

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Design of water debinding and dissolution stages of metal injection moulded porous Ti foam production

Abstract: Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) eprints@whiterose

Cited by 19 publications

References 27 publications

Influencing Factors for the Microstructure and Mechanical Properties of Micro Porous Titanium Manufactured by Metal Injection Molding

Influencing Factors for the Microstructure and Mechanical Properties of Micro Porous Titanium Manufactured by Metal Injection Molding

Development and Characterization of a Metal Injection Molding Bio Sourced Inconel 718 Feedstock Based on Polyhydroxyalkanoates

Open Celled Porous Titanium

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