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niobium powders

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Published: 01 January 1990
Fig. 6 Particle shape of niobium powder made by electron beam melting, hydriding, crushing, and degassing. 250× More
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: 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: 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: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001079
EISBN: 978-1-62708-162-7
... that of tantalum oxide (41.4 versus 25.3), niobium powder is not extensively used for capacitors. The problem with niobium is that the amorphous anodic oxide film, formed as the dielectric, crystallizes at a relatively low temperature, thereby causing performance decay in the capacitor. Tantalum cases (or cans...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001111
EISBN: 978-1-62708-162-7
... wires (rod process, modified jelly roll process, niobium tube process, in-situ process, powder metallurgy process, and jelly roll method). The article focuses on reaction heat treatment, which is required at the end of wire processing to convert the ductile components to the desired, but brittle...
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
... joints with high ductility and minimum base-metal erosion. Two diffusion-enhanced approaches have been explored to produce higher-temperature properties in niobium brazes. One method adds base-metal powder to the brazing alloy, that is, niobium powder added to a Ti-33Cr alloy brazed at 1485 °C (2705...
Image
Published: 01 August 2013
Fig. 5 In-depth variation of x-ray intensity of vanadium, niobium, and iron in vanadium-niobium-alloyed carbide coatings formed on W1 by high-temperature borax baths with the addition of 10 wt% ferrovanadium and ferroniobium powders. Coating temperature: 1000 °C (1830 °F); time: (a) 1 h and (b More
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003824
EISBN: 978-1-62708-183-2
... Abstract For chemical processing, niobium resists a wide variety of corrosive environments, including mineral acids, many organic acids, liquid metals, and most salt solutions. This article focuses on the mechanisms of corrosion resistance of niobium alloys in these environments. The niobium...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003994
EISBN: 978-1-62708-185-6
... Abstract This article focuses on the forging characteristics of different types of refractory metals and alloys, namely, niobium and niobium alloys, molybdenum and molybdenum alloys, tantalum and tantalum alloys, and tungsten and tungsten alloys. forging molybdenum molybdenum alloys...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003151
EISBN: 978-1-62708-199-3
... Abstract The refractory metals include niobium, tantalum, molybdenum, tungsten, and rhenium. They are readily degraded by oxidizing environments at moderately low temperatures. Protective coating systems have been developed, mostly for niobium alloys, to permit their use in high-temperature...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003777
EISBN: 978-1-62708-177-1
... , Volume 2 of ASM Handbook . Powder production and powder metallurgy of refractory metals are described in Powder Metal Technologies and Applications , Volume 7 of ASM Handbook . This article focuses on the refractory metals of niobium, tantalum, molybdenum, tungsten, and rhenium. Other metals...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006255
EISBN: 978-1-62708-169-6
... molybdenum alloys niobium niobium alloys refractory metals rhenium tantalum tantalum alloys tungsten tungsten alloys THE REFRACTORY METALS include tungsten, molybdenum, niobium, tantalum, and rhenium. Tungsten, molybdenum, and rhenium are typically processed by pressing and sintering powders...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001426
EISBN: 978-1-62708-173-3
..., including tantalum, niobium, rhenium, molybdenum, and tungsten. Refractory metal alloys are discussed in the order of decreasing weldability: tantalum, niobium, rhenium, molybdenum, and tungsten. microstructure molybdenum niobium refractory metals rhenium tantalum tungsten weldability welding...
Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006243
EISBN: 978-1-62708-163-4
... - Molybdenum).” and “Co-Mo-Ni (Cobalt - Molybdenum - Nickel).” in the article “Co (Cobalt) Ternary Phase Diagrams.” “Cr-Fe-Mo (Chromium - Iron - Molybdenum).” , “Cr-Mo-Ni (Chromium - Molybdenum - Nickel).” , “Cr-Mo-W (Chromium - Molybdenum - Tungsten).” , “Fe-Mo-Nb (Iron - Molybdenum - Niobium...
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: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006067
EISBN: 978-1-62708-175-7
..., ferritic, and martensitic, are well suited for manufacture via conventional powder metallurgy (PM) processes. This article presents the iron-chromium partial phase diagram to illustrate the changes in the temperature range when pure iron is alloyed with chromium. It describes AISI and UNS numbering systems...
Image
Published: 01 August 2013
Fig. 4 Optical cross-sectional view of niobium carbide coating with remarkably large thickness formed on D3 by high-temperature borax bath. Coating temperature: 1000 °C (1830 °F); time: 24 h; 10 wt% Fe-Nb powders More
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001112
EISBN: 978-1-62708-162-7
.... This compulsory antidiffusion barrier is either niobium or tantalum. These options categorize two types of PMS wire fabrication: hot processing and cold processing. Hot Processing Hot processing is the fabrication method used with the molybdenum sheath. The powder is first hot or cold compacted...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003155
EISBN: 978-1-62708-199-3
... the bulk of the superconductor. Superconducting materials that have received the most attention are niobium-titanium superconductors (the most widely used superconductor), A15 compounds (in which class the important ordered intermetallic Nb3Sn lies), ternary molybdenum chalcogenides (Chevrel phases...