In 1923, Schroeter 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. The hardness is second only to diamond, which is artificially made in the world. The first cemented carbide. When cutting steel with a tool made of this alloy, the blade will wear out quickly, and even the edge will crack. In 1929, Schwarzkov of the United States added a certain amount of compound carbide of tungsten carbide and titanium carbide to the original composition, which improved the tool's ability to cut steel. This is another achievement in the development history of cemented carbide.
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Cemented carbide has a series of excellent functions such as high hardness, wear resistance, good strength and resistance, heat resistance, corrosion resistance, etc., especially its high hardness and wear resistance, even at a temperature of 500 ℃, it is basically unchanged. , It still has high hardness at 1000℃. Cemented carbide is widely used as tool materials, such as turning tools, milling cutters, planers, drills, boring cutters, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone and general steel. It can also be used for cutting Materials that are difficult to process, such as heat-resistant steel, stainless steel, high manganese steel, and east-west steel. Nowadays, the cutting speed of new cemented carbide tools is hundreds of times that of carbon steel.
Cemented carbide can also be used to make rock drilling tools, mining tools, drilling tools, measuring tools, wear-resistant parts, metal abrasive tools, cylinder fabrics, fine bearings, nozzles, etc.
In the past two decades, coated cemented carbide has also been available. In 1969, Sweden successfully developed a titanium carbide coated tool. The matrix of the tool is tungsten-titanium-cobalt cemented carbide or tungsten-cobalt cemented carbide. The thickness of the surface titanium carbide coating is only a few microns, but compared with the alloy tools of the same trademark, use The service life has been extended by 3 times, and the cutting speed has increased by 25% to 50%. In the 1970s, a fourth-generation coating material was presented, which can be used to cut materials that are difficult to machine.
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