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powder-binder feedstock

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Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290085
EISBN: 978-1-62708-319-5
... Abstract This chapter is a detailed account of various attributes related to mixing and testing of powder-binder feedstocks. Mixing parameters and their effects on feedstock properties is discussed. The attributes reviewed include mixture homogeneity, wetting, powder-binder ratio, feedstock...
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Published: 30 April 2020
Fig. 4.1 Illustration of how feedstock (powder plus binder) strength varies with backbone binder strength for an Fe-2Ni powder in a paraffin wax (PW) and ethylene vinyl acetate (EVA) binder. Because the powder is not bonded by sintering, the feedstock strength is dominated by the backbone More
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290201
EISBN: 978-1-62708-319-5
... Abstract This chapter provides details on powder-binder processing for three materials, namely precipitation-hardened 17-4 PH stainless steel, cemented carbides, and alumina. The types of powders, binders, feedstock, shaping processes, debinding, sintering cycles, compositions, microstructure...
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Published: 30 April 2020
Fig. 5.16 Comparative plots of different flow responses. Newtonian flow is ideal, with a linear relation between applied stress and flow rate. Most powder-binder feedstock has a yield strength, so flow initiates after a required strength is exceeded. Generally, the flow rate changes More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290001
EISBN: 978-1-62708-319-5
... of feedstock and describing the challenges in component production. The chapter also summarizes alphabetically a few key concepts in powder-binder processing. binders feedstock polymers powder-binder fabrication The idea of working powders into a target shape followed by sintering emerged more...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290261
EISBN: 978-1-62708-319-5
... Abstract This chapter includes a comprehensive set of definitions used in powder-binder processing. binder feedstock powders polymers Binder and Polymer Assisted Powder Processing Randall German and Animesh Bose DOI 10.31399.asm.tb.bpapp.t59290261 Copyright # 2020 ASM InternationalW...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.9781627083195
EISBN: 978-1-62708-319-5
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290111
EISBN: 978-1-62708-319-5
... Introduction The conversion of feedstock into a shape involves the application of heat and pressure, and possibly solvents. The approaches rely on powder with different levels of saturation (pore filling by binder): If pores between particles are saturated with binder or a binder-solvent mixture...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290067
EISBN: 978-1-62708-319-5
... that the component retains its shape through all the subsequent processing steps; it plays a strengthening role. Variations in the binder ingredients lead to significant strength differences. A demonstration is shown in Fig. 4.1 for injection-molded Fe-2Ni powder with a feedstock of 30 wt% ethylene vinyl acetate...
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Published: 30 April 2020
Fig. 3.1 Outline of how constituents of backbone, filler, and additive phases are combined to produce a binder and, in turn, the powder-binder combination provides a feedstock used for shaping. The binder jetting option in additive manufacturing selectively places the binder on the powder More
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290251
EISBN: 978-1-62708-319-5
... is rotated slowly with external heating. Over time, the pellets partially melt, stick to the walls, and form a large, hollow structure on cooling. Similar ideas are applied to powder-binder mixtures, where slow rotation is required. The higher density of powder-binder feedstock requires slow rotation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290035
EISBN: 978-1-62708-319-5
... to formulate a binder. 3.1 Introduction This chapter covers binder ingredients. Combinations of binder ingredients are mixed with powder to form feedstock customized for use in various shaping processes. This is the situation for slurry and hard tooling approaches, including injection molding, extrusion...
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Published: 30 April 2020
Fig. 1.1 This flow chart illustrates the commonality of various powder-binder production processes, showing how powder and binder are mixed to form feedstock for shaping and sintering. More
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Published: 30 April 2020
Fig. 6.22 Examples of defects in powder injection molding. (a) Crack at a thick-thin junction. (b) Blisters due to evaporation of the binder. (c) Gate blemish of misaligned mold halves with parting line and ring of powder-binder separation. (d) Air pocket due to premature feedstock freezing More
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Published: 30 April 2020
Fig. 5.4 Image of a green crack in a powder-binder component where poor adhesion of binder ingredients in the feedstock resulted in an unsealed crack on the downstream after flow around a post More
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Published: 01 January 2015
Fig. 8.57 Schematic of the steps involved in powder injection molding, in which a polymer binder and metal powder are mixed to form the feedstock, which is molded, debound, and sintered More
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Published: 30 April 2020
Fig. 6.13 Powder-binder extrusion relies on a tapered die through which the heated feedstock is formed, using high pressure. More
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Published: 30 April 2020
Fig. 5.13 Relative placement of various powder-binder shaping technologies with respect to forming shear rate and feedstock viscosity (at forming temperature) More
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Published: 30 April 2020
Fig. 5.23 Relative feedstock viscosity at three solids loadings for aluminum powder in a polybutene binder. The experiments are performed using different particle sizes, identifying an inverse role of particle size on mixture viscosity. Source: Agarwala et al. ( Ref 4 ) More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000039
EISBN: 978-1-62708-312-6
... expensive coarser powders and the feasibility of liquid-phase and supersolidus sintering. 4.2.2 Feedstock In the most common version of MIM, a fine (<20 ╬╝m), near-spherical prealloyed metal powder or a mixture of elemental powders are combined with an organic binder, typically a multicomponent...