In 1923, Schreiter of Germany added 10% to 20% of cobalt as a binder to tungsten carbide powder, inventing a new alloy of tungsten carbide and cobalt, which is second only to diamond in hardness. The first type of cemented carbide. When a tool made of this alloy cuts steel, the blade wears quickly and even the edge of the blade breaks. In 1929, Schwarzkov in the United States added a certain amount of complex carbides of tungsten carbide and titanium carbide to the original composition, which improved the performance of the tool cutting steel. This is another achievement in the history of cemented carbide development.

Cemented carbide has a series of excellent properties such as high hardness, wear resistance, strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which remains basically unchanged even at a temperature of 500 ° C. It still has a high hardness at 1000 °C. Carbide is widely used as a tool material, such as turning tools, milling cutters, planers, drills, boring tools, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fiber, graphite, glass, stone and ordinary steel, can also be used for cutting Hard-to-machine materials such as heat-resistant steel, stainless steel, high manganese steel, and tool steel. The cutting speed of new cemented carbide tools is now several hundred times that of carbon steel.

Cemented carbide can also be used to make rock drilling tools, mining tools, drilling tools, measuring gages, wear parts, metal grinding tools, cylinder liners, precision bearings, nozzles, metal molds (such as wire drawing dies, bolt dies, nut dies, and Various fastener molds, the excellent properties of cemented carbide gradually replaced the previous steel mold).

Coated cemented carbide has also been available for nearly two decades. In 1969, Sweden successfully developed a titanium carbide coated tool. The base of the tool is tungsten-titanium cobalt hard alloy or tungsten-cobalt hard alloy. The thickness of the surface titanium carbide coating is only a few microns, but compared with the same grade alloy tool. The service life is extended by 3 times and the cutting speed is increased by 25% to 50%. The fourth generation of coating tools appeared in the 1970s for cutting difficult materials.

How is cemented carbide sintered?

Cemented carbide is a metal material produced by powder metallurgy of carbides and binder metals of one or more refractory metals.

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