Introduction to powder metallurgy

Update:25 May 2019
Summary:

In the 1930s, after the advent of vortex-ground iron po […]

In the 1930s, after the advent of vortex-ground iron powder and carbon-reduced iron powder, the manufacture of iron-based mechanical parts by powder metallurgy was rapidly developed. After the Second World War, powder metallurgy technology developed rapidly, new production processes and technical equipment, new materials and products continued to emerge, and opened up some areas that can produce special materials, becoming an important part of modern industry. powder Long time.

In the early days of mankind, powders of gold, silver, copper and bronze were obtained by mechanical pulverization, and used as decorative coatings for pottery and the like. In the second half of the 18th century and the first half of the 19th century, Russia, Britain, Spain and other countries used sponge scales for the production of coins and valuables through hot pressing, forging and molding, and sintering. In 1890, Kulige of the United States invented the use of powder metallurgy to produce tungsten filaments for light bulbs, laying the foundation for modern powder metallurgy.

By around 1910, people have used tungsten metallurgy to produce tungsten-molybdenum products, hard alloys, bronze oil-bearing bearings, porous filters, collector brushes, etc., and gradually formed a complete set of powder metallurgy technology. Powder metallurgy technology is developing in the direction of high density, high performance, integration and low cost. New forming technologies for powder metallurgy are emerging, such as powder injection molding, warm press forming, flow temperature forming, spray forming, high speed press forming and other new technologies. China's powder metallurgy products industry started in the mid-1950s.

Later, with the development of the automobile industry and its own materiality, it has been paid more and more attention. From 1991 to 2004, the output of China's powder metallurgy parts increased by 7.3 times in 14 years. Has entered a period of rapid development. It is expected that the average powder metallurgy weight for passenger cars in the next five years will reach 3.5 kg or more. In recent years, due to the rise of some new technologies, such as mechanical alloying, powder injection molding, warm press forming, spray forming, microwave sintering, discharge plasma sintering, self-propagating high-temperature synthesis, sintering hardening, etc., powder metallurgy materials and technologies have been obtained. The universal attention of all countries and its application are becoming more and more extensive.

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