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refractory metal powders

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240583
EISBN: 978-1-62708-251-8
... to the grain boundaries. Fig. 31.3 Ductile-to-brittle transition for recrystallized refractory metals. Source: Ref 3 Because of their high melting points and ease of oxidation, refractory metals are usually produced in powder form. Refractory metals are extracted from ore concentrates...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170596
EISBN: 978-1-62708-297-6
... infiltration is used, either all refractory metal powder is compacted to shape, or a small amount of silver or copper powder is blended with the refractory metal, compacted, and sintered in a reducing atmosphere. The sintered compact is then returned to the furnace; silver or copper is added to act...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730139
EISBN: 978-1-62708-283-9
... powder processing sheet forming Liquid to Solid Processing Metals usually are cast into molds of sand, another refractory material, or another metal. Steel and iron are cast into sand or refractory molds. Gold, silver, and refractory metals are cast into molds of high-temperature ceramics...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170308
EISBN: 978-1-62708-297-6
... and unwelded conditions, and exhibits relatively high-solid solubility for other refractory and reactive metals. The production of tantalum and its alloys starts with tantalum powder, which is isostatically pressed into bars. The bars are then electron-beam-melted into ingots or sintered at high...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460173
EISBN: 978-1-62708-285-3
... , 2011 6.4 “ Ceramic-Free Metal Powder Production for Reactive and Refractory Metals ,” ALD Vacuum Technologies GmbH, http://web.ald-vt.de/cms/fileadmin/pdf/prospekte/Eiga_engl_2011.pdf (accessed April 22 , 2015 ) 6.5 “ Metal Powder Technology ,” ALD Vacuum Technologies GmbH, http...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930353
EISBN: 978-1-62708-359-1
... Abstract This article discusses the weldability and fusion weld properties of refractory metal alloys. The alloys discussed include tantalum, niobium, rhenium, molybdenum, and tungsten. molybdenum niobium rhenium tantalum tungsten weldability THE REFRACTORY METALS, which include...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230131
EISBN: 978-1-62708-298-3
... resistance, and density. It explains how beryllide intermetallics are formed using sputter deposition, diffusion, and powder metal methods. beryllides intermetallic compounds mechanical properties oxidation resistance thermal properties 11.1 Background and Historical Information Research...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.t56030001
EISBN: 978-1-62708-418-5
... vacuum-melting and powder-metallurgy methods ( Ref 11 ). In current research, the most widely used technique is the vacuum-melting method ( Ref 21 ). At present, the process of preparing HEAs using a melting method is described as follows: put a certain proportion of pure metals into a crucible...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200437
EISBN: 978-1-62708-354-6
... crack on ceramic or refractory surface caused by thermal or mechanical shock. 2) The shallow tight cracks exhibited on the surface of a casting along the austenite grain boundaries. Creep . . . The flow or plastic deformation of metals held for long periods of time at stresses lower than the normal...
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
... compression, metering, melting, and forward advance of the feedstock, the screw is turning; during mold lling, it becomes a plunger to quickly ll the cavity. reduced powder. Metal powder produced by the chemical reduction of a compound, most typically a metal oxide. refractory. A metal or ceramic having...
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: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060085
EISBN: 978-1-62708-261-7
... the design and operation of melting furnaces as well as melting practices and the role of fluxing. It also discusses casting methods, nonferrous casting alloys, and atomization processes used to make metal powders. atomization foundry casting melting furnaces nonferrous casting alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.t56030021
EISBN: 978-1-62708-418-5
... coatings and films ( Ref 71 ). First, the widely used technique to manufacture HEA films is sputter deposition in three different ways, e.g., by a HEA target, by co-deposition with multiple metal targets and mosaic targets, and by powder targets. Second, a laser-cladding technology is applied to synthesize...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320003
EISBN: 978-1-62708-332-4
... the charge. Fig. 2.4 Schematic of a cupola installation Air for combustion is supplied through tuyeres (copper nozzles with a water-cooling jacket) from an annular wind box in the combustion zone. A “tap hole” in the refractory brick with a spout allows the molten metal to flow out...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2022
DOI: 10.31399/asm.tb.mbheaktmse.9781627084185
EISBN: 978-1-62708-418-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000223
EISBN: 978-1-62708-312-6
... for the production of massive materials and shaped objects. refractory metal. A metal characterized by its high melting temperature, generally above powder metallurgy part. A shaped object that 2000 °C (3600 °F). has been formed from metal powders and sintered by heating below the melting point re-pressing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280041
EISBN: 978-1-62708-267-9
... to be drawn through the charge metal and not to the lining or roof of the arc furnace. Again, the purpose is protection of the refractory lining. Electric Arc Furnace A popular design of EAF is illustrated schematically in Fig. 4.5 . The capacity of the AOD furnace must be matched...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480161
EISBN: 978-1-62708-318-8
... crucible. These initial efforts, with numerous improvements by others, eventually led to the consumable electrode vacuum arc remelt (VAR) electric furnaces. Large furnaces of this type serve almost exclusively for producing high-quality titanium, zirconium, and other active and refractory metals, some...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060315
EISBN: 978-1-62708-261-7
...-resistance alloys, superalloys, refractory metals, low-melting-point metals, reactive metals, precious metals, rare earth metals, and metalloids or semimetals. It also provides a brief summary on special-purpose materials, including uranium, vanadium, magnetic alloys, and thermocouple materials. light...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290193
EISBN: 978-1-62708-319-5
... hard materials. Soft sintered metals are tested on the B scale. Soft powder-binder structures are tested on the 15T scale. The hardness is reported as HRA, HRB, or HRC to indicate which test is used, for example, 65 HRB indicates the value and scale. In the Rockwell approach, the indenter...