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In 1923, Germany schleicester added 10%-20% cobalt to tungsten carbide powder as a binder, and invented tungsten carbide and cobalt alloy whose hardness was second only to diamond, which was the world's first hard alloy.When tools made of this alloy are used to cut steel, the blades wear out quickly and even crack.In 1929, schwartzkopf added a certain amount of tungsten carbide and titanium carbide compound carbide to the original composition, which improved the performance of steel cutting tools.This is hard alloy another achievement on phylogeny.
Hard alloy has high hardness, wear resistance, strong toughness, heat resistance, corrosion resistance and a series of excellent properties, especially its high hardness and wear resistance, even at 500℃ is basically unchanged, still has a higher hardness and wear resistance.At 1000℃, hard alloy is widely used as cutting tool materials, such as turning tool, milling cutter, planer, drill bit, boring tool, for cutting cast iron, non-ferrous metals, plastics, chemical fiber, graphite, glass, stone and ordinary steel.It can also be used for cutting refractory materials such as heat-resisting steel, stainless steel, high manganese steel and tool steel.The new carbide cutter now cuts hundreds of times faster than carbon steel.
Hard alloy rotary file can also be used to make rock drilling tools, digging tools, drilling tools, measuring tools, wear-resistant parts, metal abrasive, cylinder liner, precision bearing, nozzle, metal mold (such as drawing die, bolt die, nut die, all kinds of fastener die, etc.) gradually formed the good performance of hard alloy.It replaces the old steel mold.
Coated cemented carbide has also been developed in the past 20 years.TIC coating tools were developed in Sweden in 1969.The cutter seat is tungsten, titanium and cobalt carbide or tungsten and cobalt carbide.The TiC coating on the tool surface is only a few microns thick, but the service life of the tool is three times longer and the cutting speed is improved by 25% to 50% compared with the same brand alloy tool.In the 1970s, the fourth generation of coated cutters appeared for cutting difficult materials.
How is cemented carbide sintered?
Cemented carbide is a metal material made of hard alloy and this or a variety of refractory metals by combining metal powder metallurgy.