Hangzhou Powder Metal parts

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The silica powder is an important raw material for the production of polysilicon. Silica powder reacts with anhydrous hydrogen chloride in a fluidized bed reactor. It generates trichlorosilane.

After further purification of SiHCl3, it is restored and deposited to polysilicon in hydrogen. Polysilicon is the main raw material for solar cells of photovoltaic industry. In recent years, with sustained tension of global energy, it makes developing solar energy became the focus of world's energy strategy. And with the mounting of photovoltaic industry, prices of raw materials polysilicon have rapid growth. It also promotes market demand of polysilicon. There is a short supply of silica powder. So the metal powder supplier enjoys the outrageous profits.

Production capacity of silica powder is about 250,000 tons in China. They are mainly silica powder. The high purity and ultrafine silica powder rely heavily on imports. China's demand for ultra-fine silica powder will reach 60,000 tons in 2012. Among them, the rubber industry is the largest user, the coatings industry is important to have great potential applications, electronic molding compounds, silicon-based board materials and electrical and electronic castable to rely on imports of high purity and ultrafine silica powder raw materials, only the price of the ordinary spherical silica powder -3 RMB/ton, while the price of high purity and ultrafine silica powder is as high as several hundred thousand dollars / ton.

Silica powder is processed from pure quartz powder by advanced ultra-fine grinding process, is extremely versatile inorganic non-metallic materials are widely used in optical glass, electronic packaging, electrical insulation, high-grade ceramic, paint and coatings, precision casting silicone rubber, pharmaceuticals, cosmetics, electronic components, and ultra LSI, mobile communications, Chinese Powder Metal parts portable computers, aerospace and other areas of production. The microsilica is still an important raw materials for production of polysilicon.

Ultrafine silica powder has a small size, large surface area and high chemical purity, and good dispersion properties. Its superior stability, reinforcement, thickening and thixotropic, rubber, paint, pharmaceutical, paper, and so many other areas of widely used, and its related industries, the development of new materials base and technology to ensure the enjoyment of the origin of the reputation of the monosodium glutamate industry, materials science. Since its inception, has become the most able to adapt to the times and the fastest-growing varieties, one of today's time of materials science.

The developed countries have made fine inorganic materials with high performance, high added value as the focus in development of new materials in the new century

In recent years, markets of computer, network IT and the CPU sets are getting bigger and bigger. The computing speed becomes faster. And there are more and more home computers and Inteet users, computer and network technology is also growing as technical support in the microelectronics industry obtained the rapid development of the P III, P IV processor, broadband high-capacity transmission network, are inseparable from support of large-scale, ultra-large scale integrated circuit hardware.

With the rapid development of microelectronics industry, requirements for large-scale and ultra LSI packaging materials are getting higher and higher. The markets not only require superfine silicon powder. The requirements are also about high purity and low radioactive element content. There is a spherical requirement especially for particle shape. Because of its high dielectric constant, high heat, high humidity, high filler content, low thermal expansion, low stress, low impurities, low coefficient friction and other superior performances, high purity ultrafine molten spherical quartz powder has become an indispensable materials in substrate and encapsulation compound of

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