Influence of Boron-doping on Structure and Thermal Oxidation Property of Carbon Fibers
Influence of Boron-doping on Structure and Thermal Oxidation Property of Carbon Fibers
复制标题
硼掺杂对碳纤维结构和热氧化性能的影响
DOI：
10.7209/tanso.1994.15
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发表时间：
1994
期刊：
影响因子：
10.9
通讯作者：
Y. Uchiyama
中科院分区：
文献类型：
--
作者：
Kazuo Kobayashi;H. Funahashi;H. Sano;Hui‐Ming Cheng;Y. Uchiyama
研究了不同掺硼方法对不同微观结构碳纤维的d间距、表观微晶尺寸和抗氧化性能的影响。随着硼在碳纤维中的扩散，d(002)晶面间距减小，微晶尺寸Lc(002)增大。但不同微观结构的碳纤维，其X射线参数的变化不同。在B_2O_3或B_4C粉末作为掺硼添加剂的情况下，碳和硼反应在纤维表面形成了许多细小的析出物。随着析出物的形成，强度退化被观察到，并且退化被认为是由于在析出物周围形成缺陷所致。在所有情况下，氧化温度的失重曲线都比未掺杂的纤维向高温侧移动了约50-150℃。而B_2O_3和B_4C粉末法制备的B_2O_3和B_4C掺硼碳纤维则出现了氧化坑的现象。而气相沉积法制备的掺硼碳纤维表面没有明显的析出物和缺陷，说明均匀掺硼有利于提高碳纤维的抗氧化性。
Influence of boron-doping through different methods was investigated on d-spacing and apparent crystallite size, and oxidation resistance of carbon fibers with different microstructure. With diffusion of boron into carbon fiber, d (002) spacing decreased and crystallite size, Lc (002) , increased. However, the change of the X-ray parameter was different among carbon fibers with different microstructre. Many small grains of precipitates were formed on fiber surface by reaction of carbon and boron in the cases of using B2O3 or B4C powder as boron-dopant. With formation of the precipitates, degradation in strength was observed and the degradation was considered to be due to formation of defects around the precipitates. In all cases, weight-loss curve with oxidation temperature shifted about 50-150°C to higher temperature side than those of non-doped fibers. However, formation of pits by oxidation was observed for the carbon fiber boron-doped by B2O3 and B4C powder method. However, formation of precipitates and defects were not so remarkable on the surface for the fibers boron-doped with vapor deposition method, and this suggested that homogeneous boron-doping is preferable to improve oxidaation resistance of carbon fiber.