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为研究飞行器表面硅基热防护材料静电起电和泄漏特性,进行了不同微粒摩擦下的材料起电实验及不同质量烧蚀率、不同温度下的材料表面电阻率实验。结果表明:材料与沙砾摩擦后均带正电,与冰晶摩擦后均带负电,无烧蚀硅基材料起电量明显高于烧蚀后的;随着质量烧蚀率的增加,由于碳化层裸露面积比例增大,材料表面电阻率逐渐降低;当温度<460℃时,随温度的上升,电子和离子的热运动加剧,材料表面电阻率逐渐降低;当温度>460℃时,树脂发生热解,释放气体留下固体碳层,材料表面电阻率出现急剧下降;烧蚀后的(质量烧蚀率≥1.95 g/s)和高温(≥460℃)硅基材料的表面电阻率均达到了静电导体的标准,具有良好的静电泄漏特性。
In order to study the electrification and leakage characteristics of silicon-based heat-protection materials on aircraft surface, experiments of material electrification with different particle friction and experiment of surface resistivity of materials with different mass ablation rates and temperatures were carried out. The results show that both the material and gravel are positively charged and negatively charged when they are rubbed with ice. The non-ablative silicon-based material has a significantly higher electrification than that after ablation. As the mass ablation rate increases, When the temperature is lower than 460 ℃, the thermal motion of electrons and ions intensifies and the surface resistivity of the material decreases gradually. When the temperature is higher than 460 ℃, the resin pyrolysis , The release of gas leaving a solid carbon layer, a sharp decline in the surface resistivity of the material; ablated (mass ablation rate ≥ 1.95 g / s) and high temperature (≥ 460 ℃) the surface resistivity of silicon-based materials reached the electrostatic Conductor standard, with good electrostatic discharge characteristics.