The manufacturing process of modified PTFE parts is a perfect fusion of materials science and precision engineering. Cold compression molding is used in the pre-molding stage, precisely controlling the pressure (typically 8-15 MPa) and the dwell time (3-5 minutes) to ensure uniform distribution of the filler within the PTFE matrix. The sintering process is a critical step, requiring a strict step-by-step heating curve: heating from room temperature to 380°C at a rate of 2-3°C/min, holding at 380°C for 2 hours to fully crystallize the PTFE, and then slowly cooling to room temperature to avoid internal stress. Advanced manufacturers use vacuum sintering furnaces with nitrogen protection to maintain dimensional tolerances within ±0.05mm.
For parts with complex geometries, specialized cutting techniques are employed for subsequent processing. The use of diamond-coated tools enables surface roughness to reach Ra 0.2μm or less, and CNC turning precision reaches IT7. For ultra-precision requirements, electrical discharge machining (EDM) and precision grinding processes can further reduce dimensional tolerances to ±0.01mm and achieve flatness of 0.002mm/m. The integrated application of these precision manufacturing technologies ensures the reliable performance of modified PTFE parts under demanding operating conditions.
