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 Wysłany: ¦ro 2:02, 19 Sty 2011 Temat postu: Moncler jacken A |
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. Rare Metals and Cemented Carbide, 2002. 3 (2) :15-18. 【9】 GAO Jin, Chen Qinglin. Active agents of globalization on the Morphology of cobalt oxalate [J】. Metals and Cemented Carbides,Moncler jacken, 2001,Moncler online, (146) :20-22. (2006-11-27 Received; 2007-O4 a l2 Revised JDiscussionontheTechnologyforProducingUltra-fineSphericalCobaltPowderfromCarbonateLuoChonglingYiMaozhongTanXinglong (StateKeyLaboratoryofPowderMetallurgy, CentralSouthUniversity, ChangshaHunan,moncler günstig, 410083) ABSTRACT, Cobaltpowderwaspreparedbyhydrogenreductionmethodusingcarbonateasrawmaterialbysteel-beltcontinuousfumace.Discussionwasmadeontheeffectofreductiontemperatureandtimeonthepropertiesofcobaltpowder, involvingparticlesize, oxy-genandcarboncontent.Resultsshowedthatthegrainsizeofcobaltpowderincreasedwiththeincreasingoftemperatureandtime, buttheoxygencontentdecreased. Andcarboncontenthadalittlechange.Reducecarbonateat420% -460 ~ for2.5-3.0h, cobaltpowderwiththeaveragesizeof0.9p.mcouldbeproduced; also, morphologyofcobaltpowderfromcarbonatewasspherical, whichisabettermaterialforproducingultra-finecementedcarbidecomparedtothetree-likecobaltfromoxalate.KEYWORDScobaltcarbonate; ultra-finesphericalcobaltpowder; morphology; reductiontechnology a Carbide is based on the production of liquid phase sintering process, in the liquid phase sintering, dissolution / re-precipitation process leads to WC grain growth and the formation of low-energy interface prism, prismatic grains that have sharp edges and corners, the load load led to the concentration of tensile stress, the results of the promotion and propagation of the crack. sintered WC alloy microstructure in the grain tend to access to the material toughness. sintered WC grain carbide to get round a prerequisite is the use of circular particle WC powder, the powder is based on the spherical tungsten powder, the powder preparation through appropriate technology, carbonation process of the powder grain will remain circular shape,air jordans, and preferably a single crystal, or grain in the milling and (or) rupture of sintering due to the formation of sharp edges. to as raw material, the use of mild, short-term grinding (group element WC grain growth inhibition process of the most effective tools to maintain a round WC grains,stivali ugg, VC showed the strongest inhibitory effect of grain growth) for sintering WC particles can be maintained round, get a small plane , multi-step surface of the
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