为了改善尼龙66（PA66）的力学性能以及热稳定性，使其在汽车轻量化领域应用更加广泛，在PA66基体中掺杂5%~20%的碳纤维（CF）。结果表明：相比未改性的PA66材料，掺杂15% CF的PA66复合材料具有较好的综合性能。PA66/15%CF的拉伸强度为180 MPa，提升了177%；弹性模量为19 867 MPa，提高7.1倍；弯曲强度为262 MPa，提升212%；弯曲模量为15 867 MPa，提高6.4倍。PA66/15%CF的冲击强度为12.7 kJ/m²，提升49.4%。PA66/15%CF复合材料的质量保留率为22.8%，材料的热稳定性显著提高。研究表明，经CF改性增强的PA66复合材料具有用于汽车轻量化领域的潜力，以15%的掺杂量较好。

In order to improve the mechanical properties and thermal stability of nylon 66 (PA66) and make it widely used in the field of automotive lightweight, 5%~20% carbon fiber (CF) was doped in PA66 matrix. The results show that the PA66 composite doped with 15% CF has better comprehensive properties than the unmodified PA66 material. The universal testing machine test shows that the tensile strength of PA66/15% CF is 180 MPa, increased by 177%, and the elastic modulus is 19 867 MPa, increased by 7.1 times. The bending strength is 262 MPa, which is increased by 212%, and the bending modulus is 15 867 MPa, increased by 6.4 times. The impact strength of PA66/15%CF is 12.7 kJ/m², which increases by 49.4%. The mass residual rate of PA66/15%CF composite is 22.8%, and the thermal stability of the material is significantly improved. The study indicates that CF-modified PA66 composites have the potential for use in the field of automotive light weighting, with a 15% doping amount being preferable.