What are the sintering processes for cemented carbide?
The sintering process of cemented carbide is to heat the powder compact to a certain temperature and keep it for a certain time, and then cool it down, so that the porous powder compact becomes a product with certain structure and performance. A series of physical and chemical changes will occur in this process, including the elimination of contact stress between powder particles, the recovery and recrystallization of bonding metal powder, surface diffusion, and the improvement of compact strength.
According to different classification methods, the sintering process of cemented carbide can be divided into the following types:
- **According to the number of components of the sintered product**:
- **Unit system sintering**: such as sintering of tungsten and molybdenum bars.
- **Multi-component system sintering**: such as sintering of cemented carbide.
- **According to the state of the phase in the component during sintering**:
- **Solid phase sintering**: such as sintering of tungsten and molybdenum, no liquid phase appears during the sintering process.
- **Liquid phase sintering**: such as cemented carbide products, liquid phase will appear during the sintering process.
- **According to process characteristics**:
- **Hydrogen sintering**: sintering in a hydrogen atmosphere.
- **Vacuum sintering**: Sintering in a vacuum environment is conducive to removing adsorbed gases and impurities, and improving the organizational structure and performance of the sintered body.
- **Activated sintering**: By adding activators or using special sintering processes, the density and performance of the sintered body can be improved.
- **Hot isostatic pressing sintering**: Sintering under high temperature and high pressure can significantly eliminate microscopic pores and improve the mechanical properties of cemented carbide.
In addition, it can also be divided according to the name of the sintered material, such as cemented carbide sintering, molybdenum plug sintering, etc.
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