Material Analysis
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Fast UV Aging of CMC
Problem Phenomenon
After 48h of UV irradiation, CMC mechanical properties decrease by >20% and yellowing occurs
Cause Analysis
CMC molecular chains rapidly degrade by photo-oxidation under UV; surface molecular chains break to form microcracks
Solution
1)Add UV absorber 0.3-0.5wt% to block UV; 2)Add HALS 0.2wt% for radical scavenging; 3)Carbon black 2wt% to physically shield UV
Key Takeaway
Fast UV aging is caused by photo-oxidation; UV absorber and HALS are the key
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