Hangzhou Powder Metal parts

Compressed iron powder sintering is usually by adding some alloying elements to iron powder to improve the sinteringperformance. Due to the presence of boron, when sintering temperature is above 1165-1175 will appear liquid..

Powder metallurgy as a metal-processing technology containing metal powder preparation and sinter it as close meshed component. This rearrangement has two stages, primary rearrange mainly consist of individual particles, that is the random filled of mixing powder and the non-uniform capillary forces produced by liquid not evenly distributed in all contact particles, thus giving rise to sintering densification. The balance system of boron and iron does not allow the three allotropes of iron dissolved in it. However, the void ratio of vast majority of powder sintering parts are more than 5l%, so there have been all kinds of sintering technology used for getting higher density and improving sintered components performance.6% boron in iron alloy can get completely compact and materials mechanical properties significantly improved.mhcmp. For complete dense can select different boron additives, this is due to its excellent wetting properties and the very low solubility in the solid. It is well known that during the sintering process, because of the capillary forces to wetting liquids, materials liquid-phase will rearrange. Traditional powder metallurgy including metal powder mixed powder pressing and pressed body sintering under different climate.4-0.

Material loss is performance as the area, volume and quality, expressed as the abrasion value and abrasion rate, its loads way and loads time is closely related. Relatively small particles have a greater degree of capillary stresses, which pulls together particles lead to material rapidly shrink, therefore total phase improve the material density and hardness. Observe from added 1WT% boron additives alloy microstructure found that all grains are surrounded by eutectic phase. Use the countdown of wear extent express wear-resistant ability, and the economic life of most structural parts are qualified by the wear extent.Powder metallurgy as a metal-processing technology containing metal powder preparation and sinter it as close meshed component. When some materials are wearing because of contacts with other hard surfaces, their wear materials are ductility materials, and the presents sub-surface deformation and hard phase will affect material's wear performance. Therefore, abrasion resistance value is as important as material yield strength and materials fracture toughness. Some alloy iron atoms by providing easy diffusion path in terms of enhancing sinter iron powder compression capability. Due to the limited solubility of boron in iron, so that the sintered will be conducted in the presence of liquid phase, which will change the morphology and the porosity of the material, so as to improve the density of materials, improving the mechanical and wear properties of materials.

Powder Metallurgy Sintered Sprocket Metal Parts

Sintering not added boron additives sample in 1150 for 30 minutes, the holes of inside material contact area including circular and irregular shape. A large number of studies have shown that boron as FeB, Fe2B, NiB, CrB2 form added to iron or stainless steel can get higher density.

Many studies of iron-based powder metallurgy alloys indicated that sintering of boron as sintering additives can improve the material density.

The metallographic microstructure analysis showed that, after adding boron powder to the material, the porosity of the material has changed, and the development of eutectic liquid phase in Golden world place make grain thick, at the same time, with the boron content of materials rising, eutectic phase network will cover almost all of the grain boundary, in addition, the shape of the hole close to circular, and the size is relatively small.com