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Quality control of tungsten carbide ball mixture preparation process

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Quality control of tungsten carbide ball mixture preparation process


The production process for tungsten carbide ball mainly includes the mixture preparation, forming, sintering, grinding and quality testing. The quality control of each process will affect the final product performance and quality stability. Today we will learn about the quality control of cemented carbide ball mixture preparation process.


1. Raw material control

Regarding the raw materials of cemented carbide balls, WC powder purity is generally required to be greater than 99.7%, and harmful impurity elements such as Ca, Si, Al, Na, S and oxygen content are strictly controlled.Impurity elements can affect wettability;If oxygen content is too high, decarburization will occur in the sintering process of tungsten steel ball.The quality control of binder mainly includes composition, structure and particle size, etc. Generally speaking, different grades of cobalt powder with different particle size, that is, fine WC powder with fine cobalt powder, coarse WC powder with coarse cobalt powder.The particle size, particle size distribution, oxygen content and carbon content of raw material powder were kept stable.


2. Mixing process

Mixture processes mainly include wet grinding, drying and granulation.First of all, the hard phase and the bonded phase are mixed by ball milling in the ball mill. After adding the formative agent (usually paraffin or rubber), the wet abrasive slurry is dried by means of vacuum drying and steam drying. Finally, the dried mixture is rubbed and sifted for granulation.Or through the spray granulation method to achieve the mixture drying and granulation of a complete.


Zhuzhou Jinxin Cemented Co., Ltd is a manufacturer of cemented carbide raw materials. It has its own customized factory for processing cemented carbide non-standard parts. The material standard is carried out according to the national GB/T18376.3-2001, which is higher than the industry standard.



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