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gas pressure sintering

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550511
EISBN: 978-1-62708-307-2
... elements, noniron metallurgy insulating parts, thermal barrier coatings Mechanical Long-term, high-temperature resistance; fatigue, thermal shock, wear resistance Wear parts; sealings; bearings; cutting tools; engine, motor, and gas turbine parts; thermal barrier coatings Chemical, biological...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000023
EISBN: 978-1-62708-312-6
... 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 (110–380 psi) Water flow rate     (single-orifice nozzle) 200–400 L/min (53–106 gal/min) … Gas flow rate...
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
..., powders are compacted into green parts at room temperature and then sintered at atmospheric pressure. However, there are P/M processes that use no compacting step and others that combine forming and sintering in one operation. Regardless of the density of the final part, the general requirement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230267
EISBN: 978-1-62708-298-3
.... , Habashi F. , and Hanson G.T. , 1965 . “ The Preparation of Ultra-Fine Beryllium Powder by the Amalgam Process ,” Report on NASA Contract NASW 1099, General Astrometals Corporation Greenspan J. , 1964 . High Pressure Isostatic and Pressureless Sintering of Some Metal Powder Compacts...
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
...-polyethlene Wicking Slow heat to 250 °C, hold, heat to 750 °C in hydrogen 4 h Wax-polymer Supercritical Heat in freon vapor at 10 °C/min to 600 °C under 10 MPa pressure 6 h Wax-polyethlene Vacuum extraction Slow heat while passing low-pressure gas over compacts, heat to sintering temperature 36...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.9781627083195
EISBN: 978-1-62708-319-5
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290169
EISBN: 978-1-62708-319-5
... pressing supplements densification by using a high-pressure gas. References 1. Kim Y.D. , Sonezaki K. , Maeda H. , and Kato A. , Sintering Behaviour of Monodispersed ZnS Powders , J. Mater. Sci. , Vol 32 , 1997 , p 5101 – 5106 10.1023...
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
... ( Ref 7 ) shows a porous sparger element for the introduction of fine gas bubbles below the surface of a liquid. The porous tubes were made by cold isostatic pressing and sintering, then tungsten inert gas welded onto the stainless steel plenum structure. Fig. 11.15 Porous sparger element. Source...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000059
EISBN: 978-1-62708-312-6
..., including delubrication ( Ref 70 ) and rapid cooling through gas pressure quenching. Various atmospheres, including hydrogen, may be introduced. Although gas consumption is much less than with atmosphere sintering, capital cost and maintenance of vacuum furnaces are higher. With the aforementioned...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290139
EISBN: 978-1-62708-319-5
... larger pores. Such binder migration can also seal previously open pores, capturing internal gas pressure to cause blisters or cracks, especially during rapid heating. Figure 7.2 is an example of blistering caused by internal binder decomposition without pore opening. Slow processing cycles, requiring...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290201
EISBN: 978-1-62708-319-5
.... , and Miyamoto H. , Low Pressure Injection Molding and HIP Sintering of Al 2 O 3 of High Purity , J. Jpn. Soc. Powder Powder Metall. , Vol 38 , 1991 , p 782 – 786 10.2497/jjspm.38.782 • Montgomery J.K. , Drzal P.L. , Shull K.R. , and Faber K.T. , Thermoreversible Gelcasting...
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
... shape, oversized for the anticipated sintering shrinkage. The combination of temperature-pressure and tool actions depends on the forming machine. Indeed, the success of each shaping approach critically depends on matching the forming conditions, tooling and tool motions, feedstock viscosity...
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 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120047
EISBN: 978-1-62708-269-3
.... Press consolidation allows rapid (or lower-temperature) compaction of powder inside a shaped, evacuated can. Very high pressures are attainable and, with certain die designs, close to 100% density is claimed after pressing and vacuum sintering. Powder can be compacted by VHP. In this process, powder...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000167
EISBN: 978-1-62708-312-6
...-temperature sintering, especially with ferritic stainless steels, leads to both greater distortion and greater variations in dimensions, from part to part and lot to lot. Sizing operations usually require somewhat lower pressures compared to re-pressing, because only selected areas of the component...
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
... of a powder or component. It also provides a measure of the closed-off porosity. Pressurized helium is used to measure the volume of pores in a powder of known mass in a sample chamber of known volume. The ideal gas law is applied to extract the true volume of the powder. The test mass divided by this volume...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230361
EISBN: 978-1-62708-298-3
... parameters for plasma spraying of beryllium Parameters Settings Current, A 800 Voltage, V 36 Primary gas (Ar), l/m 40 Secondary gas (He), l/m 10 Powder carrier (Ar), L/m 2.5 Chamber pressure, Pa 450 Powder feed rate, g/min 3.78 Spray distance, mm 7.6 Substrate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720393
EISBN: 978-1-62708-305-8
... valve seat inserts Under development Magnetic particle inspection Surface and near-surface cracks C A Simple to operate, low cost Slow; operator sensitive Liquid dye penetrant inspection Surface cracks C D Low cost Very slow; cracks must intersect surface Pore pressure rupture/gas...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000203
EISBN: 978-1-62708-312-6
... Abstract This atlas contains images showing how sintering conditions (time, temperature, and atmosphere) and compaction pressure affect the microstructure of different types of stainless steel. It also includes images of stainless steel powders, fracture surfaces, and test specimens...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480161
EISBN: 978-1-62708-318-8
... is not controlled by a magnetic field and if the electrodes are not centered properly. Furnace pressure and gas content of the charge can affect arc behavior and product quality. At certain low pressures, the arc can become very unstable, wander erratically, and have a tendency to move to the crucible wall...