Extrusion & Post
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Large Dimensional Change of CMC with Temperature
Problem Phenomenon
Dimensions of CMC products change >2% in the range of -20 to 60°C
Cause Analysis
CMC thermal expansion coefficient is large; low crystallinity leads to high dimensional temperature sensitivity; no annealing treatment leaves residual stress
Solution
1)Add rigid filler to reduce thermal expansion coefficient; 2)Annealing treatment to stabilize dimensions; 3)Select high-crystallinity grade to reduce temperature sensitivity
Key Takeaway
Dimensional temperature sensitivity is caused by large thermal expansion coefficient; adding filler and annealing are the key
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