History of powder metallurgy
Powder metallurgy products is a process technology that uses forming and sintering processes to make metal powder (or a mixture of metal powder and non-metal powder) into materials and products. It is a branch of metallurgy and materials science.
The application range of powder metallurgy products is very wide, from ordinary machinery manufacturing to precision instruments; from hardware tools to large-scale machinery; from electronics industry to motor manufacturing; from civil industry to military industry; from general technology to cutting-edge high technology, you can see The figure of powder metallurgy process.
History of powder metallurgy development:
The powder metallurgy method originated in more than three thousand BC. The first method of making iron is essentially the powder metallurgy method.
There are three important signs in the development of modern powder metallurgy technology:
1. Overcome the difficulties in the process of refractory metal melting and casting. The manufacture of tungsten wires for electric lamps in 1909 promoted the development of powder metallurgy; the emergence of powder metallurgy cemented carbide in 1923 was hailed as a revolution in machining.
2. In the 1930s, porous oil-impregnated bearings were successfully produced; then the development of powder metallurgy iron-based mechanical parts gave full play to the advantages of powder metallurgy with little or no cutting.
3. To develop towards more advanced new materials and new processes. In the 1940s, cermets, dispersion strengthening and other materials appeared. From the late 1960s to the early 1970s, powdered high-speed steel and powdered high-temperature alloys appeared one after another; the use of powder metallurgy forging and hot isostatic pressing has been able to produce high-strength parts.