Molds & Tooling
2 views
PTFE Sintering Cracks
Problem Phenomenon
Cracks appear in PTFE compacts after sintering, especially severe in thick-walled and large products, and penetrating cracks affect structural integrity.
Cause Analysis
Too fast heating or cooling rates generate thermal stress; too high sintering temperature causes local overheating; too long holding time causes excessive crystallization; preforms damaged during demolding become crack origins; too fast pressure release after pressing completion causes product bursting.
Solution
①Control the heating rate at 0.4~1℃/min, the larger the product the slower the rate; ②Appropriately lower the sintering temperature; ③Appropriately shorten the holding time; ④Demold carefully to avoid collision, and release pressure slowly after pressing completion.
Key Takeaway
Thermal stress management for PTFE sintering cracks runs through the entire heating, holding, and cooling process; the slow-speed principle for large products is a rigid constraint; demolding protection is an often-overlooked detail.
Was this helpful?
0 people found this helpful
Thank you for your feedback!