防热材料用氮化硼纤维的制备及其在空间技术领域中的应用

Preparation of BN fiber for Thermostable Material and Its Application in Space Field

氮化硼(BN)纤维与某些无机纤维相比,具有耐高温、耐化学腐蚀、电热性能好、耐辐射等优良特性。它的抗氧化温度比碳纤维、硼纤维的高。在惰性条件下2500℃以上仍保持稳定,在氧化气氛中850℃仍是稳定的。因此,它可作为防热、隔热材料、高温过滤材料和电器绝缘材料,特别是该纤维在宇航技术领域方面的潜在应用前景更为广阔,可做抗烧蚀罩、电绝缘器、雷达天线窗、军用防护宇航服、抗中子防护罩和重返大气层的降落伞等。

Compared with other inorganic fibers, BN fiber has the excellent properties of thermostable and chemical corrosion resistance, radiolytic stability, and electrothermal. It＇s still stable in inert atmosphere at 2500℃ and in Oxygen atmosphere at 850℃. So it can he used as thermostahle material, filtering material used in high temperature and electric insulation material, especially its application prospect in the field of space is promising. For instance, it can he used as ignition loss resistance cover, insulator, radar window, space suit, protection cover resisting neutrons and parachute returning to atmosphere.