Molding Process
8 visualizaciones
PEEK Coefficient of Thermal Expansion Tg Jump
Fenómeno del problema
【Problem Phenomenon】PEEK precision parts undergo sudden dimensional changes when working conditions cross 143℃, and the fitting clearance goes out of control
Análisis de la causa
The coefficient of thermal expansion of PEEK is about 55ppm/K below Tg (143℃) and jumps to 120-140ppm/K above it; dimensional changes across Tg working conditions are nonlinear, so the design must be calculated in segments
Solución
For cross-Tg applications, check the dimensional chain according to segmented CTE; precision fitting parts avoid working temperatures spanning 143℃; design conservatively at 140ppm/K for the high-temperature segment
Conclusión clave
CTE doubles on both sides of 143℃; precision parts should avoid working across the Tg range; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!