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feedstock mixing

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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...
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
... common or most frequent) sizes. Although such a powder can result from mixing two different particle size distributions, some powder production techniques naturally produce this distribution. A main advantage is in generating a higher solids loading in feedstock. binder. Usually a polymer mixture...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.9781627083195
EISBN: 978-1-62708-319-5
Image
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
Image
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
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
..., extrusion feedstock usually relies on binders such as paraffin wax-polypropylene, water-cellulose, starch-water, or oil-solvent. Ceramic extrusion favors the biopolymers, such as starch, lactose, dextrin, sugar, and similar carbohydrates mixed with water. Residual carbon is not a concern if sintering...
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
... and binder are mixed to form feedstock for shaping and sintering. Homogeneous powder-binder feedstock is created using high-shear mixing devices. Once mixed, that feedstock is shaped into the target object, sometimes to obtain simple shapes such as disks, rods, or plates, but also possible are complex...
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
... the voids of the powder. The rheological characteristics of a powder-binder mixture are of critical importance. Successful feedstock requires a carefully balanced ratio of powder and binder for shape retention during debinding. High shear-rate mixing of binder and powder assures feedstock homogeneity...
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 attainable. The pore size is determined by the space-holder particle size, and the porosity is determined by the amount of space holder added to the feedstock. Space-holder particles are salt, sugar, Styrofoam, and polymethyl methacrylate. As a demonstration, 7 μm stainless steel powder is mixed...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290201
EISBN: 978-1-62708-319-5
... of the apparent powder differences, when this alloy is sintered in a reducing atmosphere, the properties are not influenced by powder type. Thus, in practice, gas- and water-atomized powders are mixed to lower cost and improve dimensional control. 10.1.4 Feedstock The solids loading is usually...
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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460185
EISBN: 978-1-62708-285-3
... phase during spraying, and only a small fraction of the original feedstock composition can be retained in the final coating. Figure 7.11 shows retention of SiC in Al5056-SiC composite coating with different levels of SiC mixed in the feedstock before spraying ( Ref 7.54 ). At 15% SiC in the feedstock...
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
... Abstract This chapter provides details on several specific binder formulations and a discussion of basic binder design concepts. The focus is on customization of the feedstock response to heating, pressurization, or solvent exposure for a specific shaping process. The discussion starts...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030209
EISBN: 978-1-62708-282-2
.... Many processes in the refinery involve distillation, often fractional, of hydrocarbons. In most of these distillation processes, water is present in the feedstock or by addition of steam for processing purposes. The water and steam can contain some corrosive species and are usually contaminated...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2022
DOI: 10.31399/asm.tb.tstap.t56040020
EISBN: 978-1-62708-428-4
... identified are: Suspension and Solution Precursor Thermal Spray The demand for fine-structured coatings has led to the development of thermal spray processes that are based on plasma and HVOF systems. Thus, the use of liquid feedstock in the form of suspensions or solutions enables the production...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460209
EISBN: 978-1-62708-285-3
... technology that can deposit metals or metal-ceramic composites under atmospheric conditions by accelerating feedstock particles above supersonic (300 to 1200 m/s, or 1000 to 3900 ft/s) speeds using a converge-diverge de Laval nozzle ( Ref 8.1 – 8.8 ). Because the cold spray process can produce thick deposits...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000223
EISBN: 978-1-62708-312-6
.... Not to be confused with particle Introducing air into a solution by spraying, hardness. stirring, or a similar method. (4) Supplying or infusing with air, as in sand or soil. apparent pore volume. The total pore volume of a loose powder mass or a green compact. It agitator. A device to intensify mixing. may...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290009
EISBN: 978-1-62708-319-5
... to enable key component attributes, for example, high green strength or easy tool filling. Contrast the powders shown in Fig. 2.2 and 2.3 ; the first is a large, spherical titanium powder with excellent flow, mixing, and packing attributes. It is fabricated by using centrifugal atomization of molten...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250077
EISBN: 978-1-62708-345-4
..., into the barrel. The hopper is often equipped with a desiccant-type drying system to remove moisture degradation. A magnet is placed in the hopper throat to remove any iron that has accidentally entered the feedstock. In the heated extruder barrel, which contains the reciprocating screw, the thermoplastic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740047
EISBN: 978-1-62708-308-9
... intimately mixed with the sand in the mold. In iron castings, this is normally the result of the combination of metallostatic head (the pressure exerted on the molten iron at the bottom of the mold by the weight of the metal on top of it) and the surface tension relationships between the liquid iron and mold...