| 残余相和烧结温度对碳化硅陶瓷抗混酸腐蚀特性的影响 |
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| 引用本文： | 刘泽华,齐 倩,闫永杰,张 辉,刘学建,罗宏杰,黄政仁.残余相和烧结温度对碳化硅陶瓷抗混酸腐蚀特性的影响[J].无机材料学报,2016,31(6):661-666. |
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| 作者姓名： | 刘泽华 齐 倩 闫永杰 张 辉 刘学建 罗宏杰 黄政仁 |
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| 作者单位： | (1. 上海大学 材料科学与工程学院, 上海 200444; 2. 中国科学院 上海硅酸盐研究所, 高性能陶瓷和超微结构国家重点实验室, 上海200050) |
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| 摘 要： | 本工作主要研究了残余相和晶粒尺寸对碳化硅的抗混酸(HF-HNO3)腐蚀特性。通过不同的烧结方法(固相烧结、液相烧结、反应烧结)制备出残余相不同的碳化硅材料。结果表明: 与液相烧结碳化硅(LPS SiC)和反应烧结碳化硅(RB SiC)相比, 固相烧结碳化硅(SSiC)具有更好的腐蚀抗性, 这是由于残余相石墨的抗腐蚀性强, 以及残余相在材料中形成不能相互联通的岛状结构。通过调节碳化硅的烧结温度, 可以影响材料中的晶粒尺寸, 研究结果发现相同烧结温度下随着残余相含量的增加, 材料腐蚀失重线性增加, 对曲线进行线性拟合, 其Y轴截距的绝对值代表不含碳的试样在该烧结温度下的腐蚀失重。研究表明随着烧结温度由2100℃升高到2160℃, 晶粒尺寸由2 μm增加到6 μm。此时其Y轴截距的绝对值分别为9.22(2100℃), 5.81(2130℃), 0.29(2160℃), 表明晶粒尺寸的增加有利于提高材料的抗腐蚀能力。
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| 关 键 词： | 碳化硅 抗腐蚀 残余相 晶粒尺寸 |
| 收稿时间： | 2015-11-24 |
Effect of Residual Phase and Grain Size on Corrosion Resistance of SiC Ceramics in Mixed HF-HNO3 Acid Solution |
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| LIU Ze-Hua,QI Qian,YAN Yong-Jie,ZHANG Hui,LIU Xue-Jian,LUO Hong-Jie,HUANG Zheng-Ren.Effect of Residual Phase and Grain Size on Corrosion Resistance of SiC Ceramics in Mixed HF-HNO3 Acid Solution[J].Journal of Inorganic Materials,2016,31(6):661-666. |
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| Authors: | LIU Ze-Hua QI Qian YAN Yong-Jie ZHANG Hui LIU Xue-Jian LUO Hong-Jie HUANG Zheng-Ren |
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| Affiliation: | (1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China) |
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| Abstract: | Effect of residual phase and grain size the corrosion resistance of SiC ceramics in mixed HF-HNO3 acid solution was investigated. Three kinds of fabrication methods (SSiC-solid state sintered SiC, LPS SiC-liquid phase sintered SiC and RB SiC-reaction bonded SiC) were adopted to prepare SiC ceramics. Besides, the grain size in SiC ceramics was adjusted under different sinter temperatures. Compared to RB SiC and LPS SiC ceramics, SSiC ceramics showed a better corrosion resistance for the good corrosion resistance of residual graphite and ‘island’ structure of residual phase in ceramics. The grain size of SiC ceramics sintered at temperature between 2100℃ and 2160℃ increase from 2 μm to 6 μm, and the absolute values of Y intercept, which reflect the corrosion of SSiC ceramics with none residual phase, are 9.22 μg/cm2 (2100℃), 5.81 μg/cm2 (2130℃) and 0.29 μg/cm2 (2160℃), which demonstrate that large grain size is beneficial to the corrosion resistance of SiC ceramics. |
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| Keywords: | SiC corrosion resistance residual phase grain size |
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