Causes of deformation of products in vacuum sintering furnace

There may be several reasons for the deformation of the products in the vacuum sintering furnace:

1. Uneven sintering temperature: uneven temperature distribution in the furnace will cause the local temperature of the product to be too high or too low, resulting in deformation. Possible reasons include unreasonable layout of heating elements, uneven heating power and so on.

2. Thermal stress in the sintering process: During the sintering process, thermal expansion and contraction will occur inside the product, resulting in thermal stress. If the thermal stress exceeds the bearing capacity of the material, it will cause deformation of the product.

3. Mechanical stress in the sintering process: During the sintering process, the product may be subjected to mechanical stress, such as pressure, tension, etc. If the mechanical stress exceeds the bearing capacity of the material, it will also cause deformation of the product.

4. Improper atmosphere control in the sintering process: the atmosphere in the sintering process has an important impact on the sintering effect of the product. If there are harmful gases or oxygen content is too high in the atmosphere, it will lead to oxidation, corrosion and other problems on the surface of the product, and then cause deformation.

5. Unreasonable process parameters in the sintering process: the process parameters in the sintering process, such as sintering temperature, holding time, cooling rate, etc., if the setting is unreasonable, it will also lead to product deformation.

In order to reduce product deformation, the following measures can be taken:

1. Optimize the structure of the furnace and the layout of heating elements to ensure uniform temperature distribution in the furnace.

2. Control the thermal stress and mechanical stress in the sintering process, and the stress can be reduced by adjusting the sintering temperature, holding time and other parameters.

3. Strictly control the atmosphere in the sintering process to ensure that there is no harmful gas in the atmosphere and control the oxygen content.

4. Set the sintering process parameters reasonably and adjust them according to the material characteristics and requirements of the product.

5. Take appropriate support or fixture during the sintering process to reduce the free deformation space of the product.

For products with special shapes or easy deformation, processes such as pre-forming or pre-sintering can be considered to reduce the risk of deformation.