Alloy Powders Metallurgy Industry Development
Alloy Powders metallurgy industry development
China's metallurgical powder metallurgy technology developed in the seventies and eighties of last century, not too late, but the development is not fast enough, not only to improve the number of varieties and quality also need to improve such as Alloy Powders performance Need to improve, compressibility, chemical composition needs to be improved, varieties, specifications and grades to further enrich and consistency issues need to be resolved as soon as possible, in particular, to improve production efficiency and reduce manufacturing costs to meet the increasingly fierce international and domestic market competition The
The first problem in the development of metallurgical powder metallurgy is education. It is understood that only the country Central South University, Northeastern University, Beijing University of Science and Technology, Hefei University of Technology and several other institutions have Alloy Powders metallurgy. Second, go out, the introduction. In order to promote the development of China's metallurgical metallurgical industry, China's metallurgical metallurgical industry should strengthen communication with the international industry.
Third, the development of appropriate policies to support the emerging industry as a metallurgical powder metallurgy technology development. Over the years, China has been imported from abroad a large number of MNS pre-alloy cutting steel and low-alloy steel powder, water mist powder manufacturers to promote the development and application of pre-alloy steel powder is obligated but the government should have the appropriate policy support
The basic process of metallurgy powder metallurgy includes Alloy Powders preparation, molding and sintering. The preparation method of the Alloy Powders includes mechanical crushing method, reduction method, atomization method, electrolysis method, vapor deposition method, liquid deposition method and reduction method.
Die casting (steel mold) is the most widely used method for metallurgical production of Alloy Powders. It is a semi-finished or finished product with a predetermined shape, size, density and strength. Sintering is a complex process of material transfer between alloy particles at high temperatures, which leads to the strengthening of the Alloy Powders particles and the densification of the Alloy Powders.
(1) production of Alloy Powders. The Alloy Powders production process includes the preparation of Alloy Powders, Alloy Powders mixing and other steps. In order to improve the formability and plasticity of the Alloy Powders, gasoline, rubber or waxes are added.
(2) press molding. The Alloy Powders was pressed at a pressure of 500-600 MPa into the desired shape.
(3) sintering. In the atmosphere of protection of high temperature furnaces or vacuum furnaces. Sintering is different from metal melting, sintering at least one element is still in a solid state. Become a metallurgical product, with a certain porosity and sintering process of the Alloy Powders particles through the diffusion, recrystallization, welding, compounds, dissolved a series of physical and chemical processes.
(4) after treatment. In general, sintered components can be used directly. However, for some of the high precision and high hardness requirements, the abrasion resistance of the finished parts will be processed. Post-treatment includes embossing, rolling, extrusion, quenching, surface hardening, impregnation and penetration.