Molds & Tooling
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PTFE Sintering Cracks
Fenómeno do problema
Cracks appear in PTFE compacts after sintering, especially severe in thick-walled and large products, and penetrating cracks affect structural integrity.
Análise das causas
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.
Solução
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.
Conclusão principal
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.
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