Material Analysis
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Uneven Conductivity of Carbon Fiber Reinforced PEEK
Problem Phenomenon
The surface resistivity of carbon fiber reinforced PEEK products is unevenly distributed, local conductive paths are poor, and electromagnetic shielding performance test results fluctuate greatly.
Cause Analysis
Carbon fibers orient during filling flow, making the conductive network anisotropic along the orientation direction; conductive paths are interrupted in areas of fiber breakage and poor dispersion; fiber arrangement is most disordered at weld lines where conductivity is worst.
Solution
①Optimize the injection speed profile to reduce fiber breakage; ②Design the gate to guide uniform fiber orientation; ③Verify fiber length retention and dispersion; ④Arrange conductivity test points covering weld lines and ends.
Key Takeaway
The conductivity of carbon fiber PEEK is directly related to fiber morphology management; orientation anisotropy is an inherent characteristic, and test evaluation must be carried out by zones; gentle shear protects fiber length.
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