The manufacturing process of cemented carbide mainly includes the following steps:
Mixture preparation: The carbide and bonding metal are mixed together in fine powder form and mixed thoroughly, and other elements are added if necessary. This is one of the key steps in making cemented carbide because it directly affects the chemical composition, structure and properties of the alloy.
Shaping: The mixture is formed into compacts with certain shapes, dimensions and properties. Commonly used forming methods include cold pressing and hot pressing. Cold pressing is a common forming method. It is a process in which the mixture is made into a compact with a certain density, strength, shape and size. Hot pressing is also a common method, mainly used for the production of large or special products.
Sintering: The compact is sintered at high temperature so that the bonding metal in the compact is in a liquid phase to form an alloy. The sintering temperature is usually between 1350°C and 1600°C. During sintering, the linear shortening rate of the compact is about 18%, and the volume reduction is about 50%.
The manufacturing process of cemented carbide also includes some auxiliary processes, such as grinding, pressing and testing. These processes can affect the quality and performance of the final product. For example, grinding is usually carried out in organic solutions such as alcohol and ethane, which can improve the homogeneity and fineness of the mixture; pressing is to press the mixture into a compact of a specific shape and size under high pressure; Inspection is the inspection and testing of the performance and quality of the final product to ensure that it meets relevant standards and customer requirements.
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