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Ti3SiC2表面渗硅涂层的抗高温氧化性能
Oxidation performance sof silicide coatings on Ti_3SiC_2-based ceramic
查看参考文献10篇
文摘
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采用固体粉末包埋法在Ti3SiC2陶瓷上渗硅,研究了渗硅涂层的抗高温氧化性能,用XRD及SEM/EDS分析了渗硅涂层及其氧化后产物的成分,结构和形貌等。结果表明:渗硅层主要由TiSi2和SiC组成,在空气中氧化时形成了SiO2和TiO2的混合氧化物膜,渗硅样品在1100℃和1200℃下的恒温氧化速度比Ti3SiC2降低了2-3个数量级,1100℃下抗循环氧化性能也优于Ti3SiC2,但由于渗硅层中存在裂纹,循环过程中当裂纹贯穿整个渗硅层时,涂层的氧化速度开始增加,其保护作用逐步退化。在1100℃下空气中循环氧化时,经400次循环后涂层已基本失效。 |
其他语种文摘
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Silicide coating was prepared on Ti_3SiC_2 base ceramic by pack cementation. The microstructure, phases and oxidation resistance of the coating were investigated. The results show that, the silicide coating is mainly composed of TiSi_2 and SiC; one layer of the mixture of SiO_2 and TiO_2 is formed when the coating is oxidized. At 1 100 ℃ and 1 200 ℃, the oxidation rate of silicide coat-ing is 2-3 order lower than that of Ti_3SiC_2. The cyclic oxidation resistance of the coating is much higher than that of Ti_3SiC_2. There are a great number of fine cracks in the outer layer of the coating. When these cracks penetrate whole coating during the cyclic oxida-tion, the oxidation rate begins to increase, which is the main reason for the loss of the protection of coating. |
来源
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中国有色金属学报
,2002,12(4):629-633 【核心库】
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关键词
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钛碳化硅
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渗硅
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高温氧化
;
涂层
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地址
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中国科学院金属研究所, 沈阳材料科学国家(联合)实验室, 沈阳, 110016
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1004-0609 |
学科
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金属学与金属工艺 |
文献收藏号
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CSCD:1132195
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