Molding Process
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Coarse Internal Crystallization of CMC
Problem Phenomenon
Internal spherulites of CMC products >50μm are coarse, causing decreased transparency and low impact
Cause Analysis
Cooling rate is too slow <5°C/min, allowing spherulites to fully grow; no nucleating agent is used to control crystallization
Solution
1)Increase cooling rate to >20°C/min to refine spherulites; 2)Add 0.2-0.3wt% nucleating agent to control crystallization; 3)Lower mold temperature to accelerate cooling
Key Takeaway
Coarse crystallization is caused by slow cooling; fast cooling and nucleating agent are the key
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