连续聚铝碳硅烷纤维的预氧化
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中航复合材料有限责任公司

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TQ343

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Curing of Continuous Polyaluminocarbosilane Fibers
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    摘要:

    聚铝碳硅烷( PACS) 纤维预氧化过程是制备近化学计量比SiC( Al) 纤维的关键步骤ꎮ 而连续
    PACS 纤维预氧化的氧含量控制是关键问题ꎮ 采用实时测量设备对连续PACS 纤维预氧化过程进行跟踪ꎬ用分
    段积分方法对PACS 纤维进行非等温动力学模拟ꎻ利用实时测量数据用非线性优化方法求解ꎬ可以预测PACS
    纤维预氧化增重ꎮ 本文在实验过程中ꎬ采用聚碳硅烷(PCS)纤维和PACS 纤维进行对比研究ꎮ 结果表明:在相
    同的预氧化条件下ꎬ两种纤维均在Si—H 键反应程度为40%时出现凝胶点ꎬ反应后凝胶含量均达到100%ꎬ其
    氧含量分别为9.9wt%和14.7wt%ꎻPACS 纤维的Si—H 键反应程度和增重均比PCS 纤维低ꎮ 利用实时增重数
    据ꎬ用Matlab 的Lsqnonlin 函数进行求解预氧化动力学方程ꎬ得到PACS 的预氧化活化能为62.2 kJ/ molꎬ模型可
    准确的预测其预氧化过程中的增重率变化ꎮ

    Abstract:

    Curing of polyalumninocarbosilane(PACS) is the key process to prepare near ̄stoichometric SiC(Al)
    fibers. It is crucial to control the oxygen content of continuous PACS fibers during curing. In this workꎬa new method
    has been used to predict the oxygen content of PACS fibers during curing exactly and easily. The curing process of
    PACS fibers are traced by in ̄situ measurements. And a non ̄isothermal curing dynamics model has been established
    with section integration. The dynamics model is solved with non ̄linear function using in ̄situ data. As a resultꎬ the
    weight gains during the curing can be predicted. Polycarbosilane(PCS) fiber was cured at the same condition as com ̄
    parison. It is found that:at the same conditionꎬ PACS and PCS fiber both got gel point at the Si—H reaction content
    of 40%ꎬtheir gel content both reached 100% after curingꎬ when their oxygen content is 9.7wt% and 14.7wt%ꎬrespec ̄
    tively.The weight gains and Si—H reaction content of PACS fiber are both lower than that of PCS fibers. The curing
    dynamic equation is solved by lsqnonlin function in matlab using the in ̄situ data. It is calculated that activation energy
    of PACS is 62.2 kJ/ mol. The model can predict the weight gains during curing.

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赵大方 邢 军 李效东.连续聚铝碳硅烷纤维的预氧化[J].宇航材料工艺,2016,46(3).

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  • 在线发布日期: 2016-11-28
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