In order to reasonably control the carbon content in cemented carbide balls, two carbon control methods are usually used in the powder preparation of ordinary cemented carbide balls: unsaturated carbon WC and saturated carbon WC are used as raw material powders. Let me explain it to you below.
The first method is to add a small amount of carbon black to the powder to achieve the purpose of carbon control, but this is easy to cause carbon segregation during wet grinding and abnormal growth of WC grains during sintering; Adjust the amount of glue mixed in the process and control the degumming process of the sintering process to meet the requirements of carbon increase. However, if the amount of glue added is too much, it will cause the alloy porosity to increase, which will adversely affect the performance of cemented carbide balls.
The second method is mainly to add W powder during batching to control the total carbon of the mixture. This method is simple in process, good in process stability, and has no special requirements for forming agents and sintering equipment. It is a high-quality hard material with stable production quality. Effective method for alloy balls. In addition, in order to reduce the sensitivity of cemented carbide balls to carbon content, a small amount of two-phase region broadening agents, such as TaC, TiC, NbC, Ni, etc., can be added to the powder. At the same time, rare earth will also affect the carbon content in the cemented carbide ball, because rare earth will exist in the alloy as RE2C3, and adding rare earth will reduce the effective carbon content in the alloy.
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