Powder metallurgy is an advanced manufacturing technology that collecting material preparation and parts forming, energy saving, material saving, high efficiency and near net forming (final) and no (little) pollution. It has an irreplaceable position and role in the material and parts manufacturing, has become the frontier of modern material science development. Powder metallurgy materials is a complex of matrix and pore. Its inherent pore, not only significantly affects the powder metallurgy material mechanics, physics, chemistry and technology of the performance, but also increase the difficulty of the powder precision forming process.
Enlarge the applied range of powder metallurgy parts, must be so as to realize the high densification, high performance products into a platform, the powder metallurgy technology is developing towards high densification, high performance-based, integration, optimization direction and low cost. In recent years, a series of powder metallurgy new technology, new processed emerge in endlessly, and presents the accelerate development situation, warm pressing, flow warm pressing, die wall lubrication, high speed suppression, dynamic magnetic suppression technology, explosion suppression technology, the discharge plasma sintering, etc. New technology constantly emerging, trying to build for high density, high performance, low cost and green manufacturing of complex parts system of powder forming technology.
Enlarge the applied range of powder metallurgy parts, must fulfill high-performance products, and to be the most effective way to achieve this goal is to make the material high densification. Warm-pressing of powder metallurgy compaction at a relatively low cost to create high density of powder metallurgy parts, found a best combining site for powder metallurgy parts between performance and cost.
Difference warm-pressing and general powder metallurgy process is, the use of metal powder and compacting under special lubricant in 130 ~ 150 ℃, to obtain high density products, compact density of about 0.15 ~ 0.3 g/cm3 growing rate, and cost only a little higher than the conventional powder metallurgy technology. Powder metallurgy with unique chemical composition and mechanical and physical properties, and the performance is unable to get with traditional casting method. Using powder metallurgy technology can be directly made into porous, half density or fully dense material and products, such as the oil bearing, gear, CAM, guide,cutting tool, etc., is a less, no cutting process.
