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Thesis Advisor袁方利 ; 白柳杨
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Discipline化学工程
KeywordZrc Zrb2 X射线衍射 含氧量 存在形态


Other Abstract

ZrC and ZrB2 ceramics, as high temperature materials, are widely used in aerospace and other fields. But oxygen element in ZrC and ZrB2 ceramics always have adverse effects on the performance of the ceramics. Therefore, more and more attention has been attracted on how to control the oxygen content in ZrC and ZrB2 ceramic powders and obtain high performance ceramics. The analysis of oxygen state in ZrC and ZrB2 ceramic powders can help to understand the evolution process of oxygen element in powders, which is of great significance to synthesize ZrC and ZrB2 ceramic powders with low oxygen content and high performance ceramics.In this paper, the oxygen existing forms and the total oxygen content in ZrC and ZrB2 ceramic powders were measured by oxygen-nitrogen analyzer and X-ray diffraction, respectively. The evolution process of the oxygen element in the synthesis of ZrC and ZrB2 ceramic powders was analyzed based on the oxygen state in ZrC and ZrB2 ceramic powders. The total oxygen content was studied by oxygen-nitrogen analyzer, and the oxygen content in zirconium oxides was studied by X-ray diffraction. The grain size and the crystal cell parameters of ZrC and ZrB2 were determined by X-ray diffraction. Then, the total oxygen content measured by oxygen-nitrogen analyzer, the oxygen content measured by X ray diffraction, and the difference between these two oxygen content values, were compared with the grain size of ZrC and ZrB2 powders and the crystal cell parameters of nanometer ZrC and ZrB2 respectively. Results showed that the total oxygen content and the oxygen content in oxides have no significance in relation to the grain size and crystal cell parameters. However, the difference between the two oxygen content value and the grain size and the crystal cell parameters showed linear correlation between each other. It indicated that part of oxygen element in ZrC and ZrB2 powders entered the crystal lattice of the sample and existed in the form of solid-solution-oxygen, which have affected the crystal lattices and made the change. So oxygen element in ZrC and ZrB2 powders existed in forms as not only oxides but also solid-solution.In short, some oxygen element contained in non-oxide ceramics such as ZrC and ZrB2 ceramic powders can enter the crystal lattice and existed in forms of solid-solution, which in forms that it would help to reduce the oxygen content and get high purity powders by inhibiting the formation of solid solution. 

Document Type学位论文
Recommended Citation
GB/T 7714
倪寿亮. XRD测定氧在碳化锆和硼化锆中存在形态的研究[D]. 北京. 中国科学院研究生院,2016.
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XRD测定氧在碳化锆和硼化锆中存在形态的(2407KB)学位论文 限制开放CC BY-NC-SAApplication Full Text
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