论文部分内容阅读
从粘胶纤维出发制成连续的ＳｉＣ涂层的碳纤维。在热解过程中进行聚碳硅烷溶液的ＰＳＩ处理。纤维经１０００℃高温烧成后得到Ｃ／ＳｉＣ纤维。因为碳与外表的ＳｉＣ同时在高温下生成，ＳｉＣ渗透到纤维内部，呈梯度结构。制备中使用了一种含多元胺的阻燃剂，这不仅使烧成时间大为缩短，而且使纤维的收率提高。Ｃ／ＳｉＣ纤维的收率为３５－３８％，拉伸强度为１．３－２．０ＧＰａ，弹性模量为７０－１３０ＧＰａ，纤维平均直径为４至６μ。本文还对纤维的热解动力学进行了研究，提出新的动力学模型，由此设计纤维的烧成程序。
Starting from viscose fibers, a continuous SiC-coated carbon fiber is made. The PSI treatment of the polycarbosilane solution was performed during the pyrolysis. C / SiC fibers were obtained after the fibers were fired at 1000 ℃. Because of the appearance of carbon with the appearance of SiC at high temperatures, SiC penetrates into the interior of the fiber, showing a gradient structure. A polyamine-containing flame retardant is used in the preparation, which not only shortens the firing time but also increases the fiber yield. C / SiC fibers yield 35-38%, tensile strength 1.3-2.0 GPa, modulus of elasticity 70-130 GPa, average fiber diameter 4 to 6 μ. In this paper, the kinetics of fiber pyrolysis was also studied, and a new kinetic model was proposed, from which the fiber firing procedure was designed.