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Topic: Powder metallurgy

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	Powder Metallurgy
		The metal powder is compacted by placing in a closed metal cavity (the die) under pressure.
		This compacted material is placed in an oven and sintered in a controlled atmosphere at high temperatures and the metal powders coalesce and form a solid.
		Powder metallurgy is useful in making parts that have irregular curves, or recesses that are hard to machine.
	www.efunda.com /processes/metal_processing/powder_metallurgy.cfm (379 words)

	Powder Metallurgy - Processing
		Elemental powders, such as iron and copper, are easy to compress to relatively high densities, produce pressed compacts with adequate strength for handling during sintering, but do not produce very high strength sintered parts.
		The container is evacuated, the powder out-gassed to avoid contamination of the materials by any residual gas during the consolidation stage and sealed-off.
		Powder forged parts generally are not as close to final size or shape as cold pressed and sintered parts.
	www.azom.com /details.asp?ArticleID=132 (1453 words)

	Powder metallurgy
		Next, the powder is injected into a mold or passed through a die to produce a weakly cohesive structure (via cold welding) very near the true dimensions of the object ultimately to be manufactured.
		The history of powder metallurgy and the art of metals and ceramics sintering are intimately related.
		In powder metallurgy or ceramics it is possible to fabricate components which otherwise would decompose or disintegrate.
	www.dcult.com /Metalworking/Powder_metallurgy.php (2007 words)

	Industrial: Powder Metallurgy - Production and Properties
		The powder is pumped as a slurry to a centrifuge where the powder is separated from the liquid and washed.
		The alloy is powdered by atomization or is melted to produce spatter and the particles are charged into ball mills with a lubricant such as stearic acid and reduced to the desired fineness.
		Powders produced by solid state reduction have characteristics similar to those of atomized powders and are suitable for the same applications.
	www.copper.org /resources/properties/129_6/production.html (1842 words)

	Powder Metallurgy - Search Results - MSN Encarta
		Powder Metallurgy - Search Results - MSN Encarta
		Powder Metallurgy, a technology for the manufacture of metallic articles from suitable powders.
		Powder metallurgy involves compressing finely powdered metal into a die of appropriate shape.
	uk.encarta.msn.com /Powder_Metallurgy.html (132 words)

	Technology (Site not responding. Last check: 2007-09-30)
		The ideal PIM powder should not react with the organic binder, should possess either a narrow or wide size distribution, have a relatively spherical nature so that high solid loading into the organic binder is possible, and should have a relatively fine size range (between 1 to 10 mm representing a very good processing range).
		The problem of powder separation is accentuated when there are two different powders of varying sizes (where the smaller powders do not fit into the interstitial gaps and increase packing density), when the powders have very wide density differences, and when the volume fraction of one powder is small compared to that of the other.
		Compared with the conventional approach where copper powder is mixed with tungsten powder and the powders remain separate until the composite is sintered, the microencapsulated powder approach provides a composite powder wherein the copper no longer has to be mixed separately with the tungsten.
	www.powdermetinc.com /Technology.htm (11530 words)

	PLANSEE Group \| Powder metallurgy
		Powder metallurgy is the forming of metallic powders into parts by means of high pressure and subsequent heat treatment called sintering.
		Sintering is the central technological step of powder metallurgy.
		Sintering causes the transformation of porous green compacts of powder into metallic components suitable for further processing, by means of a combination of diffusion and surface tension under high temperatures.
	www.plansee.com /powder_metallurgy_ENG_HTML.htm (139 words)

	WPI Powder Metallurgy Research Center
		The PMRC consortium (M. Boorky Center) promotes the manufacturing excellence and competitiveness of the powder metallurgy (P/M) industry by undertaking research programs that are consistent with the priorities of the industry.
		PMRC acts as an independent catalyst for industrial innovation and the exchange of information and ideas in powder metallurgy technology and management.
		It also serves as an educational center by disseminating research results to consortium members (and, eventually, to the P/M industry at large), and by developing courses and continuing education programs that address the educational needs of the industry.
	www.wpi.edu /Academics/Research/PMRC (91 words)

	Industrial: Powder Metallurgy
		Powder metallurgy, the technology of utilizing metal powders, offers the engineer a means conserving materials, reducing machining and securing a uniform product at a reasonable cost.
		Pure copper powder is used in the electrical and the electronics industries because of its excellent electrical and thermal conductivities.
		Copper is used also as an alloying element in iron powder components to enhance the mechanical properties and control dimensional changes during sintering, the addition being made either by mixing or by infiltration.
	www.copper.org /resources/properties/129_6/homepage.html (471 words)

	Powder Metallurgy Manufacturing Techniques
		Further, powder metallurgy is a flexible manufacturing process capable of delivering a wide range of new materials, microstructures, and properties.
		An increase in the irregularity and porous texture of the powder particle, i.e., decrease in apparent density, increases the reduction in volume that occurs on pressing and thus the degree of cold-welding, which in turn gives greater green strength to the compact.
		The high compressibility of a pure iron powder is thus maintained and the solution-hardening effect of the alloying elements is avoided.
	www.turktoz.gazi.edu.tr /en_makale.htm (2956 words)

	Class Definition for Class 419 - POWDER METALLURGY PROCESSES
		A material which is incorporated in the powder admixture which is wholly destroyed or separated from the other materials in a subsequent step prior to or during the consolidation or sintering operation.
		Processes wherein the powder is compacted uniformly in all directions in a preformed flexible mold immersed in a fluid in a pressure vessel, or wherein the compaction is performed on a hydraulic or hydrostatic press.
		Processes wherein the powders is compacted or shaped by pressure exerted uniformly in all directions on a preformed flexible mold immersed in a fluid in a pressure vessel, or wherein the compaction is performed on a hydraulic or hydrostatic press.
	www.uspto.gov /go/classification/uspc419/defs419.htm (4245 words)

	Powder Metallurgy Processing for Innovative Materials
		Powder metallurgy processing is a useful approach for producing a wide range of both developmental and commercial materials.
		Powder processing is also useful for producing small lots of new materials, since existing, commercial powders can often be blended together to produce the desired composition, avoiding the costs and facilities required for custom melting.
		Powder metallurgy is also capable of producing a wide range of product forms, ranging from billets to preforms to near-net-shape parts.
	www.imp.mtu.edu /metallic/metallic.html (232 words)

	Prealloyed Iron Powder Metallurgy, EMI Shielding, Atomized Steel Powder, Ancordense
		While the single largest application for ferrous powders, such as atomized steel powder or metal powder, is in the production of pressed and sintered parts, Hoeganaes serves a diverse set of industries, including casting, brazing, welding, photocopy, friction, chemical, EMI shielding and metallurgical applications.
		The manufacturing of these parts is accomplished through the powder metallurgy process consists of taking metal powders, such as ancor sponge iron powders, and mixing them with graphite, alloys and lubricants.
		The metal powder mixture is then transferred to a die cavity and compacted to the desired shape.
	www.powderiron.com /index.htm (335 words)

	Prealloyed Iron Powder Metallurgy, EMI Shielding, Atomized Steel Powder, Ancordense
		While the single largest application for ferrous powders, such as atomized steel powder or metal powder, is in the production of pressed and sintered parts, Hoeganaes serves a diverse set of industries, including casting, brazing, welding, photocopy, friction, chemical, EMI shielding and metallurgical applications.
		The manufacturing of these parts is accomplished through the powder metallurgy process consists of taking metal powders, such as ancor sponge iron powders, and mixing them with graphite, alloys and lubricants.
		The metal powder mixture is then transferred to a die cavity and compacted to the desired shape.
	www.hoeganaes.com (378 words)

	Expert: Powder Metallurgy Expert
		He is conversant with the consolidation of powders by hot isostatic pressing (HIP) to form 100% dense near net shape objects.
		Expert has very broad knowledge of mechanical and general metallurgy which covers corrosion studies in alkali metals (Na, NaK), magnesium alloys, precious metals for jewelry and electrical uses, heat treatment and working of gold alloys, clean powder manufacture, development of ultrafine filament-making process with niobium alloys, and stainless steel and titanium metallurgy.
		He is a member of the American Society for Metals, the American Powder Metallurgy Institute, The Mining, Materials, and Metallurgy Society, and the American Welding Society.
	www.intota.com /viewbio.asp?bioID=603871&perID=108258 (688 words)

	(Orthopedics) Exploring Powder-Metallurgy Alloys for Orthopedic Implants (MDDI archive, Nov 06)
		Full denseness means that during the course of being placed under heat and pressure, the powder solidifies within the container to 0% porosity (100% solid).
		Grain size after exposure to a 2100°F 30-minute cycle is larger for conventional cast-wrought (a) than for powder metallurgy (b).
		Tests were conducted to evaluate the effects of various thermal treatments on the microstructure and hardness of the conventional alloy and the powder-metallurgy alloy.
	www.devicelink.com /mddi/archive/06/11/006.html (1899 words)

	Powder Metallurgy Furnaces
		Powder Metallurgy Furnaces, Fluidized Beds, Debinding Furnaces and Powder Cleaning Devices.
		Airtorches are used whenever hot gas/air is required in a variety of powder operations.
		Spray dried powder surfaces often have to be hot cleaned with gases.
	www.mhi-inc.com /httpwww.mhi-inc.comPMpage1.htm (215 words)

	Powder Metallurgy Advantages
		Powder metallurgy (P/M) is an efficient and versatile method for manufacturing ferrous and non-ferrous machine parts and electrical and electronic components
		By mixing powders and compacting the mixture in a die, the resulting shapes are sintered, that is, heated in a controlled-atmosphere furnace to bond the particles metallurgically.
		This diagram shows the P/M process, which is cost effective in producing simple or complex parts at, or very close to, final dimensions in a variety of production rates ranging from a few hundred to several thousand parts per hour.
	www.smcpowdermetallurgy.com /advantages.htm (88 words)

	International Powder Metallurgy Directory -
		Richly illustrated, these reviews serve as a detailed introduction to powder metals technology for those new to the industry, whilst acting as an essential reference source for established industry personnel.
		Powder metallurgy products are widely used from the automotive industry through to aerospace, ordnance, power tools, electronics, business machines, household appliances, garden equipment and much more.
		Powder Injection Moulding International is a new quarterly magazine dedicated to publishing technological and commercial advances in the international metal, ceramic and carbide injection moulding industries.
	www.ipmd.net (528 words)

	Information Bridge: DOE Scientific and Technical Information - - Document #348922
		The powders were compared in terms of size and shape, bulk chemistry, surface oxide chemistry and structure, and oxide film thickness.
		The GARS aluminum powders were exposed to different relative humidity levels, demonstrating the effect of atmospheric conditions on post-atomization oxidation of aluminum powder.
		The pure aluminum powders were consolidated by two different routes, a conventional consolidation process for fabricating aerospace components with aluminum powder and a proposed alternative.
	www.osti.gov /bridge/product.biblio.jsp?osti_id=348922 (356 words)

	Wiley::A Knowledge Based System for Powder Metallurgy Technology: Engineering Research Series, Volume 11
		The rapid developments in expert systems in recent years have enabled accumulated experience and knowledge to be applied in the powder metallurgy field.
		This calls for careful modelling of the processes together with sound appreciation of both powder metallurgy and knowledge-based systems. A Knowledge-based System for Powder Metallurgy Technology introduces the reader to both fields in the early chapters and then illustrates the advantages of the use of expert systems in this significant manufacturing process.
		A Knowledge-based System for Powder Metallurgy Technology is based upon the author’s extensive experience of computing, expert systems, modelling and powder metallurgy on both sides of the Atlantic and represents a valuable addition to the Engineering Research Series.
	www.wiley.com /WileyCDA/WileyTitle/productCd-1860584020.html (407 words)

	Fundamental Manufacturing Processes, Powder Metallurgy: Infomotion
		Powder metallurgy is a metalworking technology used for producing parts from metal powder.
		This video illustrates the physical and mechanical methods used to produce metal powders, as well as an in-depth discussion of the common part production processes--mechanical pressing and sintering, metal injection molding, and hot and cold isostatic pressing.
		Through the use of shop floor footage and animations, each of these processes is explained in detail, providing a clear understanding of the similarities and differences between each of them.
	www.info-motion.net /page/I/PROD/Engineering/SME-VT660/?=jobwerx (158 words)

	Powder Materials Laboratory IIT
		Powder metallurgy (P/M) offers a highly reliable, cost-effective way of manufacturing ferrous and non ferrous parts ranging from tool and die materials to oil-impregnated bushings.
		The Powder Materials Laboratory at Illinois Institute of Technology offers a resource for keeping abreast of changes, developing and testing materials for specific applications, developing and modifying technology, manufacturing prototype or special parts, and developing or enhancing your knowledge base in the field.
		Director of the Powder Materials Laboratory, Philip Nash, Ph.D., is a professor of metallurgical and materials engineering at IIT who teaches P/M lecture and laboratory courses.
	www.iit.edu /~nash/pwdrtxt.html (756 words)

	Powder Metallurgy GPM2
		Various materials are considered, metal powders (steels, copper), ceramics (alumina, ferrites), powder mixtures (tungsten carbide-cobalt, tungsten-copper, aluminium-ceramics, etc.).
		ROURE, D. DOREMUS and E. "Analysis of die compaction of mixtures of tungsten carbide and cobalt powders", Powder Metallurgy, 1999, Vol.
		C.L. Martin, D. Study of the cold compaction of composite powders by the Discrete Element Method",Acta mater, 51; pp 373-386 (2003).
	www.gpm2.inpg.fr /axes/poudre/MetPoudre/MetPoudreuk.html (690 words)

	powder metallurgy (Site not responding. Last check: 2007-09-30)
		Is there an advantage to using powder metallurgy for certain types of materials?
		I have a powder metallurgy application which I want to get the greatest density in the finished part after compacting and heating.
		To get the greatest density should I use powder metals which are the same size or should I use powdered metals of different sizes?
	www.materialsite.com /powdermet.htm (148 words)

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