Molds & Tooling
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Poor Wear Resistance of PEEK Due to Insufficient Crystallinity
Fenómeno do problema
After use, PEEK wear parts show abnormally large wear, the surface quickly loses gloss and powders, and service life is far below the nominal value in the material handbook, while appearance and dimensions show no obvious abnormality.
Análise das causas
Low mold temperature leads to insufficient crystallization and an excessively high amorphous region proportion, and material hardness and wear resistance decrease simultaneously; such hidden defects cannot be identified by appearance and can only be confirmed through the DSC cold crystallization peak.
Solução
①Raise the mold temperature to around 180℃ and verify the actual cavity surface temperature; ②Perform DSC sampling inspection on stocked products to check the cold crystallization peak; ③Establish a corresponding archive of mold temperature–crystallinity–performance.
Conclusão principal
PEEK hidden performance defects are more dangerous than appearance defects; wear parts must use DSC crystallinity verification as the basis for shipment; actual cavity temperature measurement is more credible than the temperature controller reading.
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