Uniform design and regression analysis of LPCVD boron carbide from BCl3-CH4-H2 system |
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| Authors: | Yongsheng Liu Litong Zhang Qingfeng Zeng Wenbin Yang Siwei Li |
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| Affiliation: | a National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, You yi Xi LU, Xi’an Shaanxi 710072, People's Republic of China
b Laboratory of Advanced Materials, Department of Materials Science and Engineering, Xiamen University, Xiamen 361005, People's Republic of China |
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| Abstract: | Boron carbide was prepared by low pressure chemical vapor deposition (LPCVD) from BCl3-CH4-H2 system. The deposition process conditions were optimized through using a uniform design method and regression analysis. The regression model of the deposition rate was established. The influences of deposition temperature (T), deposition time (t), inlet BCl3/CH4 gas ratio (δ), and inlet H2/CH4 gas ratio (θ) on deposition rate and microstructure of the coatings were investigated. The optimized deposition parameters were obtained theoretically. The morphologies, phases, microstructure and composition of deposits were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman micro-spectroscopy, transmission electron microscopy (TEM), energy dispersive spectra (EDS), and Auger electron spectra (AES), the results showed that different boron carbides were produced by three kinds of deposition mechanisms. |
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| Keywords: | Uniform design CVD Microstructure Boron carbide Deposition mechanisms |
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