The hardness of cemented carbide is mainly affected by the following factors:
- Grain size: The smaller the grain size of cemented carbide, the higher its hardness. This is because the reduction in grain size will lead to an increase in the area of the grain interface, thereby enhancing the internal bonding force and density of the cemented carbide. Therefore, when manufacturing cemented carbide products, it is necessary to use fine-grained materials and control the grain size through special manufacturing processes.
- Composition and proportioning: The composition and proportioning of cemented carbide also have a great influence on its hardness. Cemented carbide mainly contains carbide, metal powder and bonded components. Among them, carbide is the main hardening phase of cemented carbide, and metal powder and bonded phase are generally used as brazing flux. Carbide with different compositions and proportions has different hardness. Generally speaking, graphitized carbide and tungsten-cobalt cemented carbide have higher hardness.
- Processing technology: Processing technology will also affect the hardness of cemented carbide. The process of preparing cemented carbide is carried out by sintering or hot isostatic pressing under high temperature and high pressure. In this process, it is necessary to control the sintering temperature and holding time, as well as the composition and pressure of the atmosphere. If the processing technology is not good, it will cause pores and defects inside the cemented carbide, thus affecting its hardness.
To sum up, the hardness of cemented carbide is mainly affected by factors such as grain size, composition and proportion, and processing technology. When manufacturing cemented carbide products, these factors need to be considered comprehensively to obtain the best mechanical properties and product quality.
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