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powder sintering

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Published: 30 April 2020
Fig. 8.10 Sintering shrinkage data for 0.78 μm aluminum nitride powder sintered in nitrogen at various time-temperature combinations. Initial shrinkage is fast, but with extended time, the shrinkage rate declines, and further lower temperatures reduce the shrinkage rate. Source: Komeya et al More
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Published: 30 April 2020
Fig. 8.7 Sintered density for a 40 μm prealloyed tool steel powder versus sintering temperature, showing how supersolidus liquid-phase sintering acts over a narrow temperature range. Source: German et al. ( Ref 2 ) More
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Published: 30 April 2020
Fig. 8.21 Early-stage sintering shrinkage for 45 nm UO 2 powder at 838 °C (1540 °F). The solid line represents a one-third power law relation between shrinkage and hold time. More
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Published: 30 April 2020
Fig. 8.22 Sintering data for 70 μm copper powder heated for a variety of times at 1050 °C (1920 °F). The surface area (normalized to the starting surface area) is a linear function of the sintered density. More
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Published: 30 April 2020
Fig. 8.23 Representation of the viscous-flow sintering behavior of a glass powder during heating at 0.8 °C/min (1.4 °F/min). The shrinkage parameter versus inverse absolute temperature gives a means to determine the activation energy for viscous flow. More
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Published: 30 April 2020
Fig. 10.19 Dilatometry sintering shrinkage for 10 μm 17-4 PH stainless steel powder, including both heating and cooling, comparing the computer-simulated dimensional change with the experimentally measured behavior. Source: Kwon et al. ( Ref 12 ) More
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Published: 30 April 2020
Fig. 8.3 Sintered density versus hold time for 42 μm titanium powder vacuum sintered at three temperatures. Faster rates of densification (steeper slopes) are associated with shorter times and higher temperatures. More
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Published: 01 June 2007
Fig. 5.53 Oxygen versus carbon contents of vacuum- and atmosphere-sintered powder metallurgy austenitic stainless steels of varying compositions. DA, dissociated ammonia. Source: Ref 71 . Reprinted with permission from MPIF, Metal Powder Industries Federation, Princeton, NJ More
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290169
EISBN: 978-1-62708-319-5
... started as powder. Monitors for sintering include density, shrinkage, conductivity, strength, or other metrics such as hardness. Neck size is a common measurement. It is the diameter of the sintered bond between two particles. The neck size ratio is the neck diameter, X , divided by the particle...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290251
EISBN: 978-1-62708-319-5
... came from the availability of small powders that sinter to near-full densities. Shaping relied on the adoption of plastic forming options. Currently, other materials are available with small particle sizes, including stainless steel at 0.1 μm. New opportunities come from new materials, material...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000223
EISBN: 978-1-62708-312-6
... of particles that are substantially noncrystalline acicular powder. A powder composed of needle in character. or sliverlike particles. angle of repose. The angular contour that a activated sintering. A sintering process during powder pile assumes. which the rate of sintering is increased, for example...
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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740373
EISBN: 978-1-62708-308-9
... Abstract This chapter covers the basic steps of the powder metallurgy process, including powder manufacture, powder blending, compacting, and sintering. It identifies important powder characteristics such as particle size, size distribution, particle shape, and purity. It compares and contrasts...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000185
EISBN: 978-1-62708-312-6
... United States market distribution of powder metallurgy stainless steel products in 1979. Source: Ref 1 Gradually, and increasingly so now, corrosion resistance has become the primary consideration for using sintered stainless steels, as is the case for wrought and cast stainless steels...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230267
EISBN: 978-1-62708-298-3
... they are consolidated prior to sintering. It also compares and contrasts the properties of beryllium products made using different methods and provides composition and particle size data on commercially available powders. beryllium powder beryllium powder metallurgy sintering 19.1 Introduction Powder...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.9781627083126
EISBN: 978-1-62708-312-6
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000001
EISBN: 978-1-62708-312-6
..., and mixtures of elemental powders of iron, chromium, and nickel were pressed and sintered in dry hydrogen ( Ref 1 , 2 ). High sintering temperatures and uneconomically long sintering times were required to achieve full homogenization of the microstructure. The so-called sensitization method made use...
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
... Abstract This chapter discusses the methods by which stainless steel powders are shaped and compacted prior to sintering, including rigid die compaction, metal injection molding, extrusion, and hot isostatic pressing. It explains where each process is used and how processing parameters...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000101
EISBN: 978-1-62708-312-6
... stainless steel powder surface modification ECONOMIC PRODUCTION of sintered stainless steel parts often relies on sintered densities of 80 to 90% of theoretical density, with internal surfaces/porosity that can have negative effects on corrosion resistance as well as the crevice-sensitive region...
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...