In 1923, Germany le shi into tungsten carbide powder, adding 10% ~ 20% of the cobalt adhesive, invented new tungsten carbide and cobalt alloy, hardness is second only to diamond, it is hard alloy artificial made the first one in the world. Made of this alloy tool cutting steel, the blade will soon wear, even the edge split. In 1929 the United States of schwarzkopf in original ingredients added to a certain amount of tungsten carbide and titanium carbide compound carbides, to improve the performance of the cutting tool steel. This is another achievement in the history of the development of cemented carbide.
Cemented carbide with high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and a series of excellent properties, especially its high hardness and wear resistance, even at 500 ℃ temperature basic remains the same, there are still very high hardness at 1000 ℃. Hard alloy are widely used as a cutting tool material, such as turning, milling, planing tool, drilling, boring cutter, etc., used for cutting cast iron, non-ferrous metal, plastic, chemical fiber, graphite, glass, stone and ordinary steel, can also be used for cutting heat resistant steel, stainless steel, high manganese steel, tool steel and other hard processing material. Now new type of cemented carbide cutting tools for hundreds of times of the cutting speed is equal to the carbon steel.
Carbide rotary file can also be used to make the drilling tools and mining tools, drilling tools, measuring gage, wear-resistant parts, metal abrasive, cylinder liner, precision bearings, nozzle, hardware mold (such as wire drawing die, bolt moulds, nut moulds, as well as a variety of fastener moulds, hard alloy of good performance gradually replaced the previous steel mold).
Over the past twenty years, coated cemented carbide also appeared. Sweden in 1969 the successful development of titanium carbide coating tool, cutting tool matrix is cobalt tungsten titanium carbide or cobalt tungsten carbide, titanium carbide coating on the surface of the thickness of just a few microns, but compared with the same brand of alloy cutting tools, 3 times longer service life, cutting speed increased by 25% ~ 50%. Have appeared in the 1970 s the fourth generation of coating tools, can be used for cutting hard material to processing.
What is sintering of hard alloy?
Cemented carbide is this kind of or many kinds of refractory metal carbides and adhesive metal, metal material is made by powder metallurgy method.