摘要
采用溶胶-浸渍法,在三维碳纤维编织体(简称:RB)的纤维表面涂覆ZrO2-SiO2复合涂层,通过XRD、SEM、等温氧化失重和非等温TG-DSC等手段研究了制备方法对涂层完整性的影响,并对涂层/编织体材料(简称:CB)氧化反应的动力学进行了系统研究。结果表明:采用该方法所得到的涂层均匀完整,与纤维表面结合良好,能显著提高编织体材料的抗氧化性能;等温条件下,材料失重低于70%时,其失重率与氧化时间呈线性关系,反应速率常数随温度的升高而增大,材料失重高于70%时,其失重率与氧化时间呈抛物线关系;非等温条件下,材料的氧化过程呈现自催化特征。
The oxidation reaction kinetics of ZrO2-SiO2 composite coating/3-D braided carbon fiber, prepared by sol-dipping method, were studied systematically through XRD, SEM. isothermal weight-loss and non-isothermal TG-DTG methods. The results show that the coating is coated symmetrically and combined well with fiber surface; In isothermal condition, when percent of weight loss is lower than 70%, the weight loss versus oxidation time show liner relation and the reaction rate constant increases with the increase of temperature, when percent of weight loss is higher than 70% , the weight loss versus oxidation time show parabolic curve relation; In non-isothermal condition, the oxidation properties of CB exhibit self-catalytic characteristic.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2007年第1期43-47,132,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金项目(90305001)
关键词
涂层
三维碳纤维编织体
氧化动力学
自催化
coating
3-D carbon fiber braid
oxidation kinetics
self-catalytic
