Dry pressing molding (or mold pressing molding) is a commonly used molding method in the preparation of advanced ceramics. It is formed by mixing ceramic powder with organic or inorganic additives, and then putting the mixture into a special mold under certain temperature and pressure conditions. Compression molding has the advantages of precise shape control, high density, and efficient production, and is widely used in ceramic products, electronic devices, automotive parts, and other fields.
Basic steps of ceramic compression molding
1. Prepare the mixture: Mix the required ceramic powder with the necessary additives. The purpose of the additives can be to enhance the molding performance, improve the fluidity of the powder, control shrinkage, etc.
2. Filling the mold: Fill the mixture into a pre-designed mold. The mold can have the desired shape and size, such as a flat plate, a pipe, a ring, etc. The filling process can be done manually or mechanically.
Molds can be divided into many types according to their structure and function. Common mold types include flat molds, cylindrical molds, ring molds, complex shape molds, etc. The choice of mold depends on the shape and size requirements of the final product.
3. Pressing: The mixture is filled into the mold and pressed using a press, hydraulic press, or other appropriate equipment. The purpose of pressing is to deform and combine the powder particles to form a dense molded body.
4. Demolding: After the pressing is completed, the molded body is removed from the mold. This may require some technical means, such as vibration, heating or the use of separate parts of the mold to help demolding.
5. Subsequent processing: After the compression molding is completed, the molded body may need to go through some subsequent processing steps, such as drying, sintering, heat treatment, surface finishing, etc., to obtain the desired final properties and appearance. Drying is to remove moisture from the molded body, while sintering is to heat the molded body to a high temperature to combine its particles and form a dense ceramic material.
Auxiliary means: In order to improve the effect of compression molding, some auxiliary means can be used. For example, vibration can help the ceramic powder be more evenly distributed in the mold and reduce the formation of voids and defects. Heating the mold can improve the fluidity and density of the powder.
Edgetech can provide various precision ceramic machined parts such as tubes, washers, insulators, rods, flanges, and other high-strength ceramic parts to meet customers’ customized requirements.