Sometimes in order to reduce the pressure andincrease parts density, also can use hot isostatic pressing method.Powder metallurgy is the combination of metalmetallurgy and ceramic sintering process, it is usually go through thefollowing process:First, powder preparation and mouldingcommonly use mechanical crushing, atomization, physical and chemical preparepowder. Due to different kinds of atomicdiffusion under the high temperature, oxide powder surface by reduction andrecrystallization of deformation of powder, the powder particles are combinedwith each other, improve the strength of powder metallurgy products, and get similarorganizations with the general alloy.
In addition, inpowder metallurgy materials usually use manganese powder as themain material or additive, it can help to improve the properties of materialsand the development of new materials. 5, powder metallurgy is suitable for producing the same shape anda large number of products, particularly the high cost of processing gear andother products, powder metallurgy manufacturers can greatly reduce productioncost. The parts after being sintered, there arestill some tiny pores, which belongs to the porous material.The advantages of powder metallurgytechnology, 1, the vast majority of refractory metals and their compounds,pseudo alloy, porous materials can only be manufactured by powder metallurgymethod. 3, the powder metallurgy technology inmaterial production process is not melting materials, and is not afraid ofmixing with the crucible and the impurities deoxy agent, and sintering isgenerally in a vacuum and restore atmosphere, is not afraid of being oxidized, andwill not bring any pollution to material, so it is possible to produce highpurity materials.
Preparation of powder after sieving and mixing, uniform mixing andadding plasticizer, then pressing, atoms in powder through solid phasediffusion and mechanical lock effect make the parts are combined into a certainstrength of the whole. But sometimes it also need necessary post processing.Second, sintering, the pressing part isplaced in the reductive atmosphere closed furnace for sintering, sinteringtemperature around the melting point is 2/3 ^3/4 times of the matrix metal. Use powder metallurgy manufacturingmethods, metal loss is only 1-5%, while using the general method of production,casting, metal loss can reach 80%. 2, the powder metallurgy method can be pressed into the final size ofthe blank, but need not or rarely required subsequent machining, so it cangreatly save metal, reduce the cost of product. Such aspressure processing, improving the work density and size shape accuracy; theiron-based powder metallurgy parts quenching, surface hardening treatment canimprove its mechanical properties; in order to reach lubrication or corrosionresistance for purposes of oil or other liquid lubricant impregnated; lowmelting point metal infiltration pore in parts to infiltration processing, canbe improving the work strength, hardness, plasticity and impact toughness.
The pressure is greater, the density is also wholesale valve parts die casting Manufacturers greater,strength increasing accordingly.Third, after treatment, in general,sintering the good parts can reach the required properties, can be useddirectly. 4, powder metallurgy method can ensure the accuracy and uniformityof materials.mhcmp.Powder metallurgy is a technology used forproducing metal powder, forming and sintering metal powder ( or metal powderand metal powder mixtures) made of materials and products.com