The high performance carbon fibers could be obtained from wastes of CF/EP composites by thermal excitation of Cr₂O₃. Recycling experiment was designed by response surface method to investigate quantitative model, then quantitative relationship between degradation ratio of epoxy resin and process parameters was established based on the higher order response model. The effect of process parameters on degradation ratio was analyzed by graph optimization. The morphology, surface elements and functional groups, and mechanical performances of the recycled carbon fiber were analyzed and characterized under optimal process parameters. The results indicated that the error of the quantitative model was within ±5 % for wastes of leftover materials, and the error was within ±11 % for wastes of composite products; the effect degree of process parameters on degradation ratio: temperature > treatment time > O₂ concentration > O₂ flow; the optimal process parameters were temperature of 500 °C, treatment time of 25 min, O₂ concentration of 80 % and O₂ flow of 180 ml/min; the surface microlite of the recycled carbon fiber underwent oxide etching resulting in a slight graphitization; the ratio of O to C content of the recycled carbon fiber decreased by 16.67 % compared with the original carbon fiber, and monofilament tensile strength was 108 % of that of the original carbon fiber.

通过Cr ₂ O _{3 的}热激发可以从CF/EP复合材料的废料中获得高性能碳纤维. 采用响应面法设计回收实验以研究定量模型，然后基于高阶响应模型建立环氧树脂降解率与工艺参数之间的定量关系。通过图形优化分析工艺参数对降解率的影响。在最佳工艺参数下对再生碳纤维的形貌、表面元素和官能团以及力学性能进行了分析和表征。结果表明：边角料废料定量模型误差在±5%以内，复合制品废料误差在±11%以内；工艺参数对降解率的影响程度：温度>处理时间>O ₂浓度> O₂流量；最佳的工艺参数为500℃温度，在25分钟的治疗时间，O- ₂的80％和O浓度₂ 180米流量升/分钟; 再生碳纤维表面微晶经过氧化蚀刻，产生轻微石墨化；再生碳纤维的O/C含量比原碳纤维降低16.67%，单丝抗拉强度为原碳纤维的108%。