STRUCTURE TRANSFORMATION OF BORON NITRIDE FIBERS
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摘要: 采用化学滴定、X 射线衍射(XRD) 及径向分布函数(RDF) 等方法, 测定了BN 纤维中残余B2O3 含量与氮化温度的关系, 研究了氮化过程中BN 纤维的结构演变规律。分析表明: 经1100℃氮化后,BN 纤维以乱层结构为主, 同时存在少量类六方相(Hexagonal-BN ) 和菱方相(O rthorhombic-BN ) ; 随高温处理温度的升高, 纤维结构逐渐向菱方相结构转变, 经1900℃高温处理后,BN 纤维的结构主要为菱方相。Abstract: The structure transformations have been studied by X ray diffraction (XRD) and radial distribution function (RDF). Chemistry titration has been employed to determine residual B 2O3 content in the BN fibers. The results show that the boron nitride fibers mainly consisted of turbostrastic structure with some hexagonal phase and rhombohedral phase after nitriding at 1100℃, and the main crystallization phase in fibers was affirmed as rhombohedral phase after 1800℃ in nitrogen atmosphere.
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Key words:
- boron nitride fiber /
- nitriding /
- structure transformation
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