Carbon fiber reinforced polypropylene-based composites with different contents of Al2O3 particles were prepared by twin-screw extrusion granulation and injection molding. The effects of Al2O3 particles on the mechanical properties and tribological properties of the composites were studied through various tests. The results show that with the increase in the content of Al2O3 content, the elastic modulus increases, the impact strength first decreases and then increases (min at 4% Al2O3), the COF first increases and then decreases (max at 6% Al2O3), and the wear resistance is best at 6% Al2O3 with a wear rate one-fifth of that without particles. This provides a basis for composite optimization.
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