Thermal creep deformation appears when melt-processable polytetrafluoroethylene (PFA) replaces PTFE in sintering

PFA products undergo significant creep at sintering temperature. Deformation usually gradually intensifies after demolding of the product, especially more pronounced in parts with asymmetric structure or large wall thickness differences. This problem causes product dimensions to exceed the tolerance range, affecting assembly accuracy and product function.

(1) Process factor: The molecular weight of PFA is lower than that of PTFE, This factor affects the '2079851475616104453 and final quality of the product. (2) Process factor: The molten state has good flowability, This factor affects the '2079851475616104453 and final quality of the product. (3) Process factor: Creep under gravity, This factor affects the '2079851475616104453 and final quality of the product.

(1) Material selection: During PFA sintering, the product uses a supporting mold to constrain its shape, Establish material selection evaluation criteria, and determine the optimal solution through comparative tests. (2) Parameter adjustment: Reduce the sintering temperature close to the lower melting limit, Note that after lowering the temperature, it is still necessary to ensure the material fully reacts or melts; adjust step by step and observe the effect. (3) Formulation adjustment: Reduce the sintering time., Adjust gradually and verify the effect, ensuring that other performance indicators of the product are not affected. (4) Preventive measure: Perform shrinkage and warpage simulation analysis in the product design stage to optimize the structure and process plan in advance.

The deformation problem originates from internal stress generated by uneven shrinkage or heating of various parts of the product; it needs to be systematically solved from three aspects: structural design, process parameters, and post-treatment.