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Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006121
EISBN: 978-1-62708-175-7
.... The effects of processing conditions on the physical and chemical properties of tungsten, molybdenum, tantalum, niobium, and rhenium powders are reviewed. chemical properties molybdenum powders niobium powders physical properties powder production refractory metal powders rhenium powders tantalum...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006583
EISBN: 978-1-62708-290-7
... Abstract Tungsten, molybdenum, and cemented carbide parts can be produced using several additive manufacturing technologies. This article classifies the most relevant technologies into two groups based on the raw materials used: powder-bed methods, such as selective laser melting, electron beam...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006052
EISBN: 978-1-62708-175-7
... Fig. 2 Tungsten carburization model. Carburization occurs via a reaction between blended tungsten and carbon powders in a diffusion-controlled process via a shrinking-core mechanism. Fig. 1 Process steps in hard metal production Fig. 4 Spray drying (fountain mode) atomizes...
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
... Abstract This article discusses the pressing and sintering of various refractory metal powders for the production of intermediate products as well as special cases of finished products. The metal powders considered include tungsten, molybdenum, tantalum, niobium and their alloys, as well...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006090
EISBN: 978-1-62708-175-7
... particle size. (b) Buckbee Mears sieve Table 8 Particle size distribution for tungsten powder Particle size distribution, μm Weight, % As supplied Lab milled min max min max 0–5 6 18 … … 5–10 22 38 … … 10–15 20 35 … … 15–20 12 25 … … 20–25...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006123
EISBN: 978-1-62708-175-7
... Abstract This article focuses on the selection, properties, and applications of powder metallurgy refractory metals and their alloys, including tungsten, molybdenum, tantalum, niobium, and rhenium. molybdenum niobium powder metallurgy refractory metals rhenium tantalum tungsten...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006418
EISBN: 978-1-62708-192-4
... composition and properties of representative cemented carbide grades and their applications are listed in a table. cemented carbides friction mechanical properties metalworking mining tool physical properties powder metallurgy tungsten carbide-cobalt wear resistance wear-resistant components...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006099
EISBN: 978-1-62708-175-7
... with a solid infiltrant prior to subsequent melting and penetration. Fig. 3 Infiltration process for carbide-infiltrated bit head. Key components include graphite mold (16, 22), tungsten carbide powder (28), tungsten powder (30), steel blank (24), and sand components (18). Fig. 4 Electron...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006017
EISBN: 978-1-62708-175-7
... shortcoming of these filaments, attempts were made to improve this property by the addition of a few percent of a lower-melting, ductile metal. Tungsten powder was mixed with 2 to 3% Ni, pressed into a compact, and sintered in hydrogen at a temperature slightly below the melting point of nickel. The resulting...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006091
EISBN: 978-1-62708-175-7
... composites based on tungsten carbide skeletons. For a combination of properties, or sometimes for a special requirement, a skeleton made of a mixture of tungsten and tungsten carbide is used. The blended powder contains either the mixture of tungsten and tungsten carbide or a mixture of tungsten...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001104
EISBN: 978-1-62708-162-7
... of the tungsten carbide powder Preparation of the other carbide powders Production of the grade powders Compacting or powder consolidation Sintering Postsinter forming The sintered product can be directly used or can be ground, polished, and coated to suit a given application...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006094
EISBN: 978-1-62708-175-7
... Abstract Superalloys are predominantly nickel-base alloys that are strengthened by solid-solution elements including molybdenum, tungsten, cobalt, and by precipitation of a Ni 3 (Al, Ti) type compound designated as gamma prime and/or a metastable Ni 3 Nb precipitate designated as gamma double...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001049
EISBN: 978-1-62708-161-0
... be melted in air. An appendix to this article presents the property data and corresponding information on a family of cobalt-chromium-tungsten-carbon alloys that use P/M processing. cobalt-base superalloys consolidation method iron-base superalloys powder metallurgy superalloy vacuum melting...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006133
EISBN: 978-1-62708-175-7
... niobium quality control refractory metal powders rhenium secondary operations tantalum tungsten tungsten heavy alloys welding REFRACTORY METALS are typically processed from powders into ingots that are subsequently swaged into round bars or rolled into plates. Additional rolling, drawing...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001283
EISBN: 978-1-62708-170-2
... in Japan , Ceramic Bulletin , Vol 66 ( No. 4 ), 1987 , p 647 – 650 43. Mulligan S. and Dowding R.J. , “Sinterability of Tungsten Powder CVD Coated with Nickel and Iron,” Technical Report 90-56, U.S. Army Mater. Tech. Lab., Watertown, MA , 1990 44. Sheppard L.M...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006086
EISBN: 978-1-62708-175-7
..., nickel powders, and tungsten powders are among the many types of metal powders whose production techniques are described and discussed. Reliable techniques for powder characterization and testing are required to evaluate the chemical and physical properties of metal powders, both as individual...
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
... shows the actual microstructural evolution of an article formed from tungsten powder at representative stages ( Ref 1 ). Fig. 1 Stages of sintering, showing changes in the grain and pore structure. Source: Ref 1 Fig. 2 Micrographs of tungsten powder during solid-state sintering...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001456
EISBN: 978-1-62708-173-3
... powder to the brazing filler alloy were necessary to prevent Kirkendall void formation ( Ref 3 ). A Mo-20Ru brazing filler was used to braze a doped Mo-3Re filament to a tungsten post. Because of a requirement to minimize any recrystallization of the filament, a laser welder working in an argon...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006018
EISBN: 978-1-62708-175-7
... % Grade I Grade II Grade III Total manganese 99.5 98.0 95.0 Free metallic manganese 99.0 … … Granulation  –200 sieve … 98.0 99.0  –230 sieve 100 … …  –325 sieve 98 … … Particles <10 μm diam 50 (max) … … The major use of tungsten powder is as a fuel...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003152
EISBN: 978-1-62708-199-3
... salts—particularly cobalt oxalate. The cobalt binder phase is altered significantly during milling with WC and subsequent liquid-phase sintering operations. The TiC/TaC/NbC powders are produced from metal oxides of titanium, tantalum, and niobium. These oxides are mixed with metallic tungsten powder...