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Topic: Sintering

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	Powder Metallurgy - Sintering and Sintering Furnaces
		As the term ‘sintered part’ implies, sintering is a key part of the operation.
		The operation is almost invariably carried out under a protective atmosphere, because of the large surface areas involved, and at temperatures between 60 and 90% of the melting-point of the particular metal or alloys.
		For powder mixtures, however, the sintering temperature may be above the melting-point of the lower-melting constituent, e.g.
	www.azom.com /details.asp?ArticleID=1725 (413 words)

	Sintering Lunar Bricks
		Sintering of full-scale "bricks" from lunar soil simulant materials can be accomplished by radiant heating to 1100¡C for approximately 2 hours, followed by slow cooling.
		Sintering can also be accomplished using a combination of microwave and radiant heating, though the technique is extremely sensitive to thermal profile and configuration.
		Bricks sintered in a hydrogen atmosphere do indeed contain enough iron metal to permit lifting by a relatively small magnet, and the lifting requirement would be reduced by a factor of six in lunar gravity.
	ares.jsc.nasa.gov /HumanExplore/Exploration/EXLibrary/DOCS/EIC049.HTML (2836 words)

	Plasma arc sintering of silicon carbide - Patent 4676940
		However, sintering of silicon carbide should be performed in the absence of oxygen or oxygen-bearing gases, including water and carbon dioxide, to prevent formation of oxides, which may result in products having undesirable physical and chemical properties.
		The preferred gases for sintering of silicon carbide are nitrogen, argon, helium, hydrogen and/or neon, however, any plasma gas may be used in accordance with the present invention, depending upon sintering requirements.
		Sintering temperatures and plasma gas enthalpies will vary depending on which plasma gas is utilized in the process of the invention.
	www.freepatentsonline.com /4676940.html (3587 words)

	Computational Modeling of Sintering Research Brief
		Sintering is a critical, possibly the most important, processing step during manufacturing of ceramics.
		Yet, modeling and prediction of sintering behavior is in its infancy, lagging far behind the other manufacturing models.
		Sintering stress is necessary for the prediction of macroscopic shrinkage and dimensional changes observed during sintering.
	www.sandia.gov /materials/sciences/factsheets/CompMod.html (439 words)

	Metal Sintering Processes Powder metal forming
		Sintering is mainly used for cermets i.e components made for a combination of metal and ceramics
		The sintered parts shrink on cooling and shapes are only processed which can be removed from the mould on completion of the process.
		Sintering is generally based on heating the green component to a temperature above the melting point of at least one of the powder constituents.
	www.roymech.co.uk /Useful_Tables/Manufacturing/Sintering.html (623 words)

	PROCESS OF SINTERING WITHIN THE BLAST FURNACE (Site not responding. Last check: )
		Initially, the raw material mix is placed on a sintering strand, and the coke on the upper surface of the bed is ignited when the mixture passes under burners in an ignition hood, but thereafter its combustion is maintained by air drawn through the bed of materials by a suction fan.
		The driving force in sintering is increasing the surface energy; as the sintering proceeds, adjacent particles partially coalesce owing to viscous flow (as in glass) or to diffusion processes (as in crystalline materials), and consequently the total surface area increases.
		As a result ot the sintering process a porous lump is produced with a drastically increased surface area (179%) and thus the rate of the reaction is drastically increased as well.
	www.stormpages.com /loreto/sintering3.htm (501 words)

	Materials Research - Sintering of Ni-Zn ferrite nanopowders by the constant heating rate (CHR) method (Site not responding. Last check: )
		The sintering of ferrites via solid state, as well as of other ceramic materials, is a thermal process that causes reduction of the surface area through the formation of grain boundaries, neck growth between particles and usually also densification.
		Solid state sintering may be performed by two alternative processes: densification, with a change of the solid-vapor interface (particle-pore) into solid-solid interface with less energy, or grain growth, with the transformation of numerous small grains (the compact's particles) into a smaller number of large grains.
		The early, intermediate and final stages of Ni-Zn ferrite sintering were evaluated to investigate the effect of the concentration of Zn on the sintering of nanometric powders of Ni-Zn ferrites synthesized by combustion reaction.
	www.scielo.br /scielo.php?pid=S1516-14392004000400003&script=sci_arttext (2069 words)

	Silicon carbide sintering - Patent 4876226
		In preferred embodiments, the sintering composition includes alpha-silicon carbide or beta-silicon carbide, and the combined amount of alumina and calcia is at least 0.05% by weight, preferably between 1 and 20% by weight (silicon carbide making up the remainder), of which calcia represents at least 0.01% by weight, preferably between 0.1 and 10% by weight.
		The densities of pellets sintered according to this method are at least 98% of the theoretical density, as determined by pore count.
		The density of the sintered silicon carbide pellet, as measured by pore count, was approximately 100% of the theoretical density (with the exception of some local, isolated areas containing fabrication flaws in which the density was less than 100%).
	www.freepatentsonline.com /4876226.html (2391 words)

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