Metallurgy

Laboratory can help metal powder screening test, test whether the quality of metal powder is up to standard.

The manufacture and application of metal powder have a long history. In ancient times, gold, silver, copper, bronze and some oxide powders were used as coatings for coloring and decorating pottery, jewelry and other utensils. In the early 20th century, W. D. Coolidge, an American, used hydrogen to reduce tungsten oxide to produce tungsten powder to produce tungsten wire, which was the beginning of modern metal powder production. Since then, copper, cobalt, nickel, iron, tungsten carbide and other powders have been prepared by chemical reduction method, which promoted the development of early powder metallurgy products (oil-bearing, porous filter, cemented carbide, etc.). At this time, carbonyl method was invented to produce iron powder and nickel powder. In the 1930s, iron powder was first produced by eddy current grinding, and then by solid carbon reduction. The cost was very low. In the early 1930s, molten metal atomization also appeared. This method was initially used to produce powders of low melting point metals such as tin, lead and aluminium. By the early 1940s, it was developed to produce iron powder by high pressure air atomization. In the 1950s, alloy steel and various alloy powders were prepared by high pressure water atomization. In the 1960s, a variety of atomization methods were developed to produce high alloy powder, which promoted the development of high performance powder metallurgy products. Since the 1970s, there have been many methods of physical and chemical reactions in gas and liquid phases to produce coated and ultrafine powders with important applications.