Boron powder is one of the basic raw materials for powder metallurgy industry. The annual productions of boron powder are about 850 000 tons in every year
85% of boron powders are used in the manufacturing powder metallurgy parts, while 70% to 83% of powder metallurgy parts are applied in automobile industry. The rest boron powder is used in the chemical industry, magnetic materials, cutting, welding rod and heating materials.
As the economic and technological development, the fluctuations in the development of automobile industry, the overall trend of boron powder is stable and rose slightly, from 8% to 10% of the passive margin, the peak can reach 850 000 t 780 000 t trough, however, car increase in the amount of powder metallurgy parts for motorcycles. Vehicle production fluctuations, but the total production of boron powder is not less than 850 000 t, before the new process, the capacity surplus.
From the powder metallurgy product performance requirements of the development of new products came into being, for example, to improve the density and strength of powder metallurgy parts, adding a nickel, copper, chromium, molybdenum and other elements, so the diffusion alloy powder, researchers continue to deepen. In order to improve the uniformity of the density of green products to improve the repression process, pre-mixed powder is now maturing to adapt to the temperature and pressure process to improve the green density, temperature and pressure flour into a big step. Technology development with the powder forging, powder forging using the powder has matured. Of particular note is the powder lubricant, temperature and pressure, the die wall lubrication, evil strength of the lubricant. Green strength over 40 MPa can be machined. Boron powder production atomization of boron powder with water-based, improve its R & D work more, not much improved restore the performance of the boron powder.
According to the powder metallurgy history and national conditions, the number of Chinese metal powder exporter in production of high strength, high-density parts is small. And Due to the technical and development capabilities of powder metallurgy products, most of China's production is in low-density parts. Therefore, the reduction of boron powder in China occupy the boron powder market, the opposite is true with other countries. The next few years to restore the boron powder is an important part of industry development and research of boron powder. Dense particles of water atomized powder of boron powder, high purity, good compression, and easy to alloying, the manufacture of high school strength and density of powder metallurgy parts in China, efforts to promote, in particular, is pre-mixed powder. Promotion of water-atomized iron powder is a general trend, but now accounts for 80% of the market to restore the boron powder, which is the international problems encountered with Chinese characteristics.
Research and development direction of Chinese boron powder is to improve the purity, retain high compression and solve the structural problems of aggregation of inclusions. It adapt to moderate-intensity parts. Due to the limitations of manufacturing process, with the guarantee of high compression, how to improve the bulk density is an important problem. As the qualified boron dwindling and chemical composition mixed, it is bound to promote the ore powder and restored boron powder. Because the concentrate powder’s compositions are stabile, it improves the stability of boron powder. So developing ore powder and restored boron powder will become a future direction.Source:http://www.mhcmp.com
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