powder metallurgy


powder metallurgy
the art or science of manufacturing useful articles by compacting metal and other powders in a die, followed by sintering.
[1930-35]

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Fabrication of metal objects from a powder rather than casting from molten metal or forging at softening temperatures.

In some cases the powder method is more economical, as in making metal parts such as gears for small machines, in which casting would involve considerable scrap loss. In other cases, melting is impractical (e.g., because the melting point of the metal is too high). Powder metallurgy is also used to produce a porous product that will allow a liquid or gas to pass through it. See also metallurgy, sintering.

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      fabrication of metal objects from a powder rather than casting from molten metal or forging at softening temperatures. In some cases the powder method is more economical, as in fashioning small metal parts such as gears for small machines, in which casting would involve considerable machining and scrap loss. In other cases melting is impractical because of the very high melting point of the metal—e.g., tungsten—or because an alloy is desired of mutually insoluble materials such as copper and graphite. Finally, powder metallurgy is used to produce a porous product that will allow a liquid or gas to permeate it.

      In the bonding process, powder particles are first compressed to the desired shape, then heated (sintered) at a temperature below the melting point of the metal or, in the case of an alloy, of the metal with the highest melting point. Metal powders are produced by either chemical or mechanical means. In chemical powdering, either a compound of the metal is reduced by a chemical agent or a liquid solution containing the metal is electrolyzed. In mechanical powdering, the metal is usually milled by power hammers or by balls in a rotating container.

      Ductile metals are usually combined in an alloy of two or more metals with a lubricant and then pressed or briquetted by a hard steel die. refractory metals, those with high melting points, are compacted with an added binder, such as paraffin wax. Cemented carbides are formed by bonding the hard, heat-resistant particles together with a metal, usually cobalt. See also metallurgy. (metallurgy)

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Universalium. 2010.

Look at other dictionaries:

  • Powder metallurgy (P/M) — Powder metallurgy (P/M). См. Порошковая металлургия (П/М). (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • Powder metallurgy — is the process of blending fine powdered materials, pressing them into a desired shape (compacting), and then heating the compressed material in a controlled atmosphere to bond the material (sintering). The powder metallurgy process generally… …   Wikipedia

  • powder metallurgy — n. the science or process of working metals and alloys by reducing them to powder and shaping this into solids under great heat and pressure …   English World dictionary

  • powder metallurgy — miltelių metalurgija statusas T sritis chemija apibrėžtis Technologiniai procesai metalų milteliams ir iš jų sukepintiems gaminiams gauti. atitikmenys: angl. powder metallurgy rus. порошковая металлургия …   Chemijos terminų aiškinamasis žodynas

  • powder metallurgy — noun the metallurgy of powdered metals; how to produce solid metal objects from powdered metal by compaction and sintering • Hypernyms: ↑metallurgy …   Useful english dictionary

  • powder metallurgy — noun Date: 1933 a branch of science or an art concerned with the production of powdered metals or of metallic objects by compressing a powdered metal or alloy with or without other materials and heating without thoroughly melting to solidify and… …   New Collegiate Dictionary

  • powder metallurgy — Смотри Металлокерамика …   Энциклопедический словарь по металлургии

  • powder metallurgy — Смотри порошковая металлургия …   Энциклопедический словарь по металлургии

  • powder metallurgy — noun the production and working of metals as fine powders which can be pressed and sintered to form objects …   English new terms dictionary

  • powder metallurgy — pow′der met allurgy n. mel the art or science of manufacturing useful articles by compacting metal and other powders in a die, followed by sintering • Etymology: 1930–35 …   From formal English to slang


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