Cobalt in the Cemented Carbide Process

2022-11-17 Share

Cobalt in the Cemented Carbide Process


Nowadays, because cemented carbide has high hardness, wear resistance, and elastic modulus, cemented carbide tools play important roles when you are looking for modern tool materials, wear-resistance materials, high-temperature materials, and corrosion-resistance materials. Since Co has good wettability and adhesive to WC and TiC, it is widely used as an adhesion agent in the industry as a cutting tool material. Using Co as an adhesion agent makes the cemented carbide the advantages of high strength, high hardness, and high wear resistance.

However, due to the high price of cobalt metal and the scarcity of resources, people have been looking for substitutes for cobalt metal. The common substitutes that have now been used are nickel and iron. Unfortunately, using iron powder as an adhesion agent usually has low mechanical strength. Using pure nickel as a carbide adhesion agent physical and mechanical properties of the cemented carbide is not as good as those using cobalt as the adhesion agent. The process control is also difficult if using pure nickel as an adhesion agent.

The role of cobalt in cemented carbide is as an adhesion agent metal. Cobalt can impact the toughness of cemented carbide through its plastic deformation ability at room temperature. Cemented carbide is formed by a sintering process. Cobalt and nickel become the universal adhesion agent of cemented carbide. Cobalt has an important impact on cemented carbide production, and around 90% of cemented carbides use cobalt as an adhesion agent. 

Cemented carbide is composed of hard carbides and soft adhesion agent metals. Carbide provides the ability to withstand load and wear resistance to alloy, and the adhesion agent provides the ability to plastically deform at room temperature. Impact toughness of carbide. To make sure sintered products are in good condition, adhesion agents play an important role in wetting the cemented carbide.

A Series of tungsten-cobalt carbides is used for cutting tool tips and mining equipment that need to work on high-hardness surfaces. Some durable surgical instruments and permanent magnets are also made of cobalt alloys.

The ductility and toughness of the cemented carbide products can be given by the adhesion agent. At the same time, an adhesion agent provides the ability for high-melting cemented carbide can be made into parts at a temperature far below the melting point 

The best adhesion agent should be able to completely wet the high melting point of cemented carbide. Iron, cobalt, and nickel all can meet the requirements for a good adhesion agent.

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