Excessive creep deformation of PTFE products

PTFE sintered parts creep beyond the allowable value under continuous load. Deformation usually gradually intensifies after demolding of the product, and is more significant especially in parts with asymmetric structures or large wall thickness differences. This problem causes the product dimensions to exceed the tolerance range, affecting assembly accuracy and product function.

(1) Process factor: The weak intermolecular force of PTFE leads to cold flow (creep); this factor affects the '2079851475616104453 and final quality of the product. (2) Crystallization behavior aspect: Insufficient sintering results in low crystallinity; crystallinity changes affect the mechanical properties and dimensional stability of the product. (3) Process aspect: Uneven cooling causes shrinkage differences among regions, generating temperature difference stress. (4) Design aspect: Asymmetric structure or uneven wall thickness distribution causes anisotropic shrinkage. (5) Material aspect: Differences in molecular chain orientation or fiber arrangement direction cause different shrinkage in each direction.

(1) Formulation optimization: Use modified PTFE (adding fillers such as glass fiber, carbon fiber, bronze powder), determine the optimal addition amount through small-batch tests, and verify the impact on the comprehensive performance of the product. (2) Design optimization: Optimize the sintering process to increase the crystallinity to a reasonable range, combine process simulation analysis or trial mold verification, and continuously iteratively improve the design plan. (3) Implementation measure: Consider creep factors in product design., formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (4) Preventive measure: Conduct shrinkage and warpage simulation analysis in the product design stage, and optimize the structure and process plan in advance.

Deformation problems originate from internal stress generated by uneven shrinkage or heating of various parts of the product, and need to be systematically solved from three aspects: structural design, process parameters, and post-processing.