In 1923, Schleter of Germany added 10% to 20% of cobalt to tungsten carbide powder as a binder, and invented a new alloy of tungsten carbide and cobalt, whose hardness is second only to diamond. The first cemented carbide made. When cutting steel with a tool made of this alloy, the cutting edge will wear out quickly, and even the cutting edge will crack. In 1929, Schwarzkov in the United States added a certain amount of compound carbides of tungsten carbide and titanium carbide to the original composition, which improved the performance of the tool in cutting steel. This is another achievement in the history of cemented carbide development.
Carbide can also be used to make rock drilling tools, mining tools, drilling tools, measuring tools, wear-resistant parts, metal abrasives, cylinder liners, precision bearings, nozzles, metal molds (such as wire drawing dies, bolt dies, nut dies, and Various fastener molds, the excellent performance of cemented carbide gradually replaced the previous steel molds).
Coated cemented carbides have also been around for nearly two decades. In 1969, Sweden successfully developed a titanium carbide coated tool. The base of the tool is tungsten-titanium-cobalt carbide or tungsten-cobalt carbide. The thickness of the titanium carbide coating on the surface is only a few microns, but compared with the same brand of alloy tools, The service life is extended by 3 times, and the cutting speed is increased by 25% to 50%. In the 1970s, a fourth generation of coated tools appeared for cutting difficult-to-machine materials.
How is cemented carbide sintered?
Cemented carbide is a metal material made by powder metallurgy of carbides and binder metals of one or more refractory metals.