Some information about cemented carbide

September 17,2021



Cemented carbide has high hardness, strength, wear resistance and corrosion resistance. It is known as "industrial tooth". It is used to manufacture cutting tools, cobalt tools and wear-resistant parts. It is widely used in military industry, aerospace, machining, metallurgy, oil drilling, mining tools, electronic communication, construction and other fields. With the development of downstream industries, the market demand for cemented carbide is increasing.




Cemented carbide can be used to make rock drilling tools, mining tools, drilling tools, measuring tools, wear-resistant parts, metal abrasives, cylinder liners, precision bearings, nozzles and hardware molds (such as wire drawing molds, bolt molds, nut molds and various fastener molds. The excellent performance of cemented carbide has gradually replaced the previous steel molds).



Performance characteristics:


High hardness (86-93HRA, equivalent to 69-81hrc);


Good thermal hardness (up to 900-1000℃, maintained at 60HRC);


Good wear resistance;


The cutting speed of cemented carbide tools is 4-7 times higher than that of high-speed steel, and the tool life is 5-80 times higher. The service life of manufacturing molds and measuring tools is 20-150 times higher than that of alloy tool steel. It can cut hard materials of about 50HRC.


However, cemented carbide is brittle and can not be cut, so it is difficult to make an integral tool with complex shape. Therefore, it is often made into blades with different shapes, which are installed on the tool body or die by welding, bonding, mechanical clamping and other methods.



Material properties:


Cemented carbide is a powder metallurgy product sintered in vacuum furnace or hydrogen reduction furnace with carbide (WC, TIC) micron powder of high hardness refractory metal as the main component and cobalt (CO), nickel (Ni) and molybdenum (MO) as the binder.


The carbides, nitrides and borides of group IVB, VB and VIB metals are collectively referred to as cemented carbide due to their high hardness and melting point.





The production of cemented carbide is to mix tungsten carbide and cobalt in a certain proportion, press them into various shapes, and then semi sinter them. This sintering process is usually carried out in a vacuum furnace. Put it in a vacuum furnace to complete sintering. At this time, the temperature is about 1300 to 1500 degrees Celsius.


Cemented carbide sintering molding is to press the powder into blank, heat it to a certain temperature (sintering temperature), maintain it for a certain time (holding time), and then cool down, so as to obtain cemented carbide materials with required properties.



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