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Research on Preparation and Microstructures of Zirconium Doped C/C Composites

Author: ShiYue
Tutor: ChiWeiDong
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: C / C composites Nano - ZrO2 Nano - ZrC Uniform distribution Antioxidant
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 133
Quote: 0
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Abstract


To address the refractory metal oxide, carbide distribution in the C / C composite material, the paper prepared by different raw materials and process three kinds of zirconium-doped C / C composites. Form of zirconium in the presence of C / C composite material, microscopic morphology, crystalline state, distribution, and composite antioxidant properties, the main work is as follows: 1, for the synthesis of zirconium oxychloride with Zirconium liquid phase precursor and its impregnating agents to an initial density of pure C / C composites doped zirconium processing to study the variation of density and ZrO2 content, zirconium in the composite form of existence and distribution status and antioxidant properties. The results showed that: Precursor after treatment at 1000 ° C and 1600 ° C, complete conversion of the nano-ZrO2 crystals and nano-crystal ZrC and evenly distributed in the surface of the substrate material with the surface of the carbon fiber. ZrC is generated in the liquid reaction mechanism in the high temperature process. Nano-ZrO2 prepared C/C- and C/C- nano-ZrC composite antioxidant performance improved significantly. 2, zirconium acetate solution and asphalt materials, prepared ZrO2 content up to 70% C/C- nano-ZrO2 composites and C / ZrC composite materials, its densification law of the material in the presence of zirconium in the form and distribution of , high temperature oxidation resistance. The results showed that: zirconium complete conversion after 1000 ° C and 1600 ° C. The process as ZrC crystal of monoclinic nano-ZrO2 crystals and cubic nanometer and uniformly distributed in the matrix material and the surface of the carbon fiber. The ZRC based liquid phase reaction mechanism generated. Nano-ZrO2 not only interacts with the C / C composite material of carbon matrix, while reinforced carbon fiber interaction, so that the fiber surface defects and holes, the lower part of the fiber reinforced role. Synthesized benzoic zirconyl, and prepared its source is zirconium a different zirconium content of the modified asphalt, and a zirconium content of modified asphalt. The zirconium content of 3% modified asphalt prepared by the oxidation resistance of zirconium-doped C / C composite materials, the existence of different state of zirconium in the C / C composite. The results showed that: change the softening point and viscosity increases with zirconium content. Complete conversion after treatment at 1000 ℃ and 1600 ℃ monoclinic nano-of ZrO2 crystal and cubic nanometer of ZrC crystal and evenly distributed in the matrix material and the carbon fiber surface, oxidation resistance compared to the pure C / C composites improved.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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