Microstructure and reaction mechanism of SiC ceramic with mullite-zircon as a new liquid-phase sintering additives system
Microstructure and reaction mechanism of SiC ceramic with mullite-zircon as a new liquid-phase sintering additives system
复制标题
莫来石-锆石新型液相烧结添加剂体系SiC陶瓷的微观结构及反应机理
DOI：
10.1016/j.msea.2012.08.133
复制
发表时间：
2013
期刊：
影响因子：
6.4
通讯作者：
杨勇
中科院分区：
文献类型：
--
作者：
杨勇
为了改善碳化硅陶瓷的力学性能和热震性能，在碳化硅陶瓷中引入了莫来石-锆英石(Al_2O_3-SiO_2-ZrSiO_4)作为一种新型的液相烧结添加剂体系。通过热力学计算分析了添加体系的碳化硅陶瓷在烧结过程中的反应机理，最终样品中检测到了莫来石-锆石体系。SiO_4相是由ZrB_2和SiO_2在空气中反应生成的，并均匀分布在碳化硅基体中。晶须状莫来石相在1350℃完全晶化，随着烧结温度从1350℃升高到1400℃，微晶尺寸增大，这一过程可用气-液-固(VLS)机理解释。研究了烧结温度和ZrB2含量对其性能的影响，并对反应机理进行了探讨。结果表明，在1400℃烧结时，样品致密性较好，而ZrB2含量对致密化过程起着重要作用。
Mullite-zircon (Al2O3–SiO2–ZrSiO4), as a new liquid-phase sintering (LPS) additives system, was introduced into the silicon carbide (SiC) ceramics in order to improve the mechanical and thermal shock properties. The reaction mechanism of the SiC ceramics with additive system during the sintering process was analyzed by thermodynamic calculation and the mullite-zircon system was detected as expected in the final specimens. The ZrSiO4phase was generated from the reactions of ZrB2and SiO2in air and distributed homogeneously in the SiC matrix. The mullite phase in the form of crystal whisker was completely crystallized at 1350°C, and the size of the crystallite increased with the increase of the sintering temperature from 1350°C to 1400°C. This process was explained by vapor–liquid–solid (VLS) mechanism. The influences of sintering temperature and the content of ZrB2content on their properties and the reaction mechanism were studied. It was found that the specimens were compact when sintered at 1400°C, and the content of ZrB2played an important role in the densification process.
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DOI：
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发表时间：
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