A new treatment condition involving superheated steam (SHS) was proposed to achieve optimal carbon fiber recovery with a minimal decrease in fiber strength. Unidirectional carbon fiber reinforced sheets were exposed to SHS at 650 °C for 1 h with the addition of N₂ or CO₂ as process gas. The recovery was assessed based on mass change and using thermogravimetry and differential scanning calorimetry. The results showed that the addition of N₂ efficiently suppressed the decrease in fiber strength and achieved optimal recovery. Weibull parameters indicated that lower strength fibers tended to present a narrower strength distribution. The observation of fracture surfaces and oblique sections indicated that the presence of intrinsic defects and corrosion of surface crystallites under the oxidative condition are responsible for the deterioration of and the changes in the distribution of strength.

提出了一种涉及过热蒸汽（SHS）的新处理条件，以实现最佳的碳纤维回收率，同时纤维强度的降低最小。在添加N ₂或CO ₂作为工艺气体的情况下，将单向碳纤维增强板在650°C的SHS中暴露1 h 。基于质量变化并使用热重分析和差示扫描量热法评估回收率。结果表明，N _2的添加有效地抑制了纤维强度的下降，并实现了最佳的回收率。威布尔参数表明，较低强度的纤维倾向于呈现较窄的强度分布。断裂表面和倾斜截面的观察表明，在氧化条件下固有缺陷的存在和表面微晶的腐蚀是强度变差和强度分布变化的原因。