反应烧结碳化硅陶瓷内筒的损毁机制

发布时间：2018-04-20 18:07

本文选题：预热器 + 内筒　；参考：《工程科学学报》2016年05期

【摘要】：以X射线衍射仪、扫描隧道电子显微镜、能量散射光谱仪等手段对在悬浮预热器内筒上使用前后的反应烧结碳化硅陶瓷进行分析,研究该陶瓷应用于悬浮预热器上的损毁机制.碳化硅陶瓷中残存金属硅和表面的碳化硅在高温使用工况下首先氧化成Si O_2,Si O_2在K2O(g)、Na2O(g)、KCl(g)、Na Cl(g)等蒸气以及氯化物作用下黏度降低,形成覆盖于陶瓷表面的氧化层,继而被高速的气固流体冲蚀和磨损掉,并导致新的界面出现.如此循环,使碳化硅陶瓷的外侧逐渐变薄和断裂,直至损毁.提高陶瓷的致密性和降低残余硅含量是改进反应烧结碳化硅陶瓷在悬浮预热器中使用性能的有效途径.
[Abstract]:By means of X-ray diffractometer, scanning tunneling electron microscope and energy scattering spectrometer, the reaction-sintered silicon carbide ceramics before and after use on the inner cylinder of the suspension preheater were analyzed, and the damage mechanism of the ceramic applied to the suspension preheater was studied. The residual metal silicon and silicon carbide on the surface of silicon carbide ceramics were first oxidized into Sio _ 2O _ 2 under the condition of high temperature operation. The viscosity of silicon carbide ceramics was reduced under the influence of vapor such as K _ 2O _ 2, Na _ 2O _ 2 and Na _ Cl _ 2, thus forming an oxide layer covering the surface of the ceramics. It is then eroded and worn out by high-speed gas-solid fluids, resulting in the emergence of new interfaces. Such circulation, make the outside of silicon carbide ceramic gradually thinning and fracture, until damage. Increasing the densification of ceramics and reducing the content of residual silicon is an effective way to improve the performance of reactive sintering silicon carbide ceramics in suspension preheater.
【作者单位】：北京科技大学材料科学与工程学院;中国矿业大学(北京)机电与信息工程学院;山东圣川陶瓷材料有限公司;
【基金】：国家科技支撑计划资助项目(2013BAF09B01)
【分类号】：TQ172.6;TQ174.75

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