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gas pressure sintering

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Published: 01 November 1995
Fig. 24 Gas pressure sintering process More
Image
Published: 01 December 2004
Fig. 8 Scanning electron micrograph of a plasma etched gas-pressure sintered Si 3 N 4 (GPSN) ceramic with typical acicular Si 3 N 4 crystallites. The microstructure shows gray Si 3 N 4 matrix grains and a lighter grain-boundary phase. More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003054
EISBN: 978-1-62708-200-6
... resistance, and other properties. This article discusses the fundamentals of sintering and its effects on pore structures and particle density. It addresses some of the more common sintering methods, including solid-state, liquid-phase, and gas pressure sintering, and presents alternative processes...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003795
EISBN: 978-1-62708-177-1
... for chemical solution etching and give reproducible results ( Ref 10 ). Fig. 8 Scanning electron micrograph of a plasma etched gas-pressure sintered Si 3 N 4 (GPSN) ceramic with typical acicular Si 3 N 4 crystallites. The microstructure shows gray Si 3 N 4 matrix grains and a lighter grain-boundary...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001107
EISBN: 978-1-62708-162-7
... be applied uniaxially in hot pressing or isostatically in hot isostatic pressing. Covalent materials such as silicon carbide and silicon nitride, and composite systems usually undergo hot pressing. Pressure can also be used to suppress the decomposition of materials (such as in the gas-pressure sintering...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006069
EISBN: 978-1-62708-175-7
... and postsinter hot isostatic pressing (HIP). Sintering Hardmetals are sintered in vacuum, as well as hydrogen and neutral gas-based atmospheres. Vacuum sintering is used to control composition through carbothermal reduction and carburization. Partial pressure is mostly used at high temperatures during...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006105
EISBN: 978-1-62708-175-7
... transfer to subsequent operations. Because burned-off gases and water vapor must escape during the delubrication portion of the sintering cycle, the compaction pressure must be low enough to avoid the entrapment of these gases. Entrapped gas can manifest as excessive porosity in the center of the part...
Image
Published: 01 January 1990
pressure is exerted evenly on it by pressurized argon gas (right). More
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006134
EISBN: 978-1-62708-175-7
.... Pall S-Series PSS ™ Medium , Pall Corporation Product Bulletin , 2014 , p 1 – 4 46. Rubow K. , Prause D. , and Eisenmann M. , A Low Pressure Drop Sintered Metal Filter for Ultra-High Purity Gas Systems , Proceedings of the 43rd Annual Technical Meeting of the Institute...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006118
EISBN: 978-1-62708-175-7
.... A gas pressure of 67 to 200 Pa (500 to 1500 µm Hg) is typical for sintering of stainless steel. Argon used as the backfill gas provides an inert atmosphere, resulting in mechanical properties similar to those obtained with hydrogen. When nitrogen is used for backfilling, rapid cooling is necessary...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005793
EISBN: 978-1-62708-165-8
... Abstract The plasma carburizing process is basically a low-pressure carburizing process making use of a high-voltage electrical field applied between the load to be treated and the furnace wall producing activated and ionized gas species responsible for carbon transfer to the workpieces...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006124
EISBN: 978-1-62708-175-7
... pressing pressures make the removal of the water vapor very difficult and time-consuming. If the outside of the pressed shape sinters to high density before all the water vapor is removed, the gas is trapped within the billet and forms internal defects. Fig. 8 Fractional sintered density...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006106
EISBN: 978-1-62708-175-7
... escape during the delubrication portion of the sintering cycle, the compaction pressure must be low enough to allow for sufficient porosity to avoid the entrapment of these gases. Entrapped gas can manifest as excessive porosity in the center of the part and can appear as a dark stain in the center...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006068
EISBN: 978-1-62708-175-7
... atomization Gas atomization Type of furnace Induction Induction Furnace capacity Up to 4500 kg (10,000 lb) Up to 5000 kg (11,000 lb) Melting Open air Open air Atomizing medium Water Argon (nitrogen) Water pressure 11–18 MPa (1500–2500 psi) … Gas pressure … 0.76–2.6 MPa (110...
Book Chapter

By Erhard Klar
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003185
EISBN: 978-1-62708-199-3
... to sintering hot isostatic pressing A process combining temperature and high pressure gas to densify a material into a net-shape component using a pressure-tight outer envelope metal injecting molding A process in which a mixture of a metal powder and plastic binder is injection molded...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006137
EISBN: 978-1-62708-175-7
... and using common sintering atmosphere gases are explosion, fire, toxicity, and asphyxiation. atmosphere supply systems inspection maintenance safety and environmental concerns sintering atmosphere generators sintering atmospheres SINTERING ATMOSPHERES (endothermic gas, exothermic gas...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006117
EISBN: 978-1-62708-175-7
... due to grain growth and pore coalescence can occur; greater expense Insoluble gas in sintering atmosphere Trapped gas in closed pores; residual porosity; swelling can occur for sintering times longer than the optimal time Use of grain growth inhibitor Smaller final grain size; more homogeneous...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006097
EISBN: 978-1-62708-175-7
... compacts ( Fig. 1 ). Also, in comparison to gas-atomized powders, these powders are significantly lower in cost. This fact, in combination with the near-net shape capability of powder metallurgy (PM), makes the PM process commercially viable. A shortcoming of the water-atomized stainless steel powders...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
... by sintering and followed by HIPing and by gas pressure sintering have the best impact resistance. For ball sizes of 6.35 mm (0.25 in.), the maximum contact pressure of 20 to 25 GPa (2.9 to 3.6 × 10 6 psi) was required to form surface ring cracks; for ball sizes of 12.7 mm (0.50 in.), 10 to 15 GPa (1.5 to 2.2...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006135
EISBN: 978-1-62708-175-7
... cooling sections. This article provides information on the different zones of these furnace sections. It describes the types of atmospheres used in sintering, namely, endothermic gas, exothermic gas, dissociated ammonia, hydrogen, and vacuum. The article concludes with a discussion on the furnace zoning...