Oxidation Protection Coatings for C/SiC based on Yttrium Silicate
Oxidation Protection Coatings for C/SiC based on Yttrium Silicate
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DOI：
10.1016/s0955-2219(98)00241-6
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发表时间：
1998-12
影响因子：
5.7
通讯作者：
J. Webster;M. Westwood;F. Hayes;R. Day;R. Taylor;A. Durán;M. Aparicio;K. Rebstock;W. Vogel
中科院分区：
文献类型：
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作者：
J. Webster;M. Westwood;F. Hayes;R. Day;R. Taylor;A. Durán;M. Aparicio;K. Rebstock;W. Vogel
目前阻碍碳纤维增强碳化硅（C/SiC）在高温结构应用如燃气涡轮机发动机中使用的因素是碳纤维在高于400°C的温度下的氧化。因此，有必要开发能够在1600°C下长时间保护C/SiC部件免受氧化的涂层。传统的涂层由多层不同材料组成，设计用于通过暴露于氧气时形成玻璃相来密封裂缝。这项工作的目的是开发一种涂层，这是固有的抗裂性，因此，不需要昂贵的密封层。硅酸钇已被证明具有用于防氧化涂层所需的性能。这些要求可以概括为低杨氏模量、低热膨胀系数、良好的耐腐蚀性和低氧气渗透性。介绍了以SiC粘结层为基础，结合硅酸钇抗侵蚀外层和阻氧层的防护涂层的发展。热力学计算机计算和有限元分析已被用于设计涂层。采用化学气相沉积和注浆成型相结合的方法对C/SiC样品进行了涂层处理。评价了涂层的抗氧化性能。
The factor which currently precludes the use of carbon fibre reinforced silicon carbide (C/SiC) in high temperature structural applications such as gas turbine engines is the oxidation of carbon fibres at temperatures greater than 400°C. It is, therefore, necessary to develop coatings capable of protecting C/SiC components from oxidation for extended periods at 1600°C. Conventional coatings consist of multilayers of different materials designed to seal cracks by forming glassy phases on exposure to oxygen. The objective of this work was to develop a coating which was inherently crack resistant and would, therefore, not require expensive sealing layers. Yttrium silicate has been shown to possess the required properties for use in oxidation protection coatings. These requirements can be summarised as being low Young’s modulus, low thermal expansion coefficient, good erosion resistance, and low oxygen permeability. The development of protective coatings based on a SiC bonding layer combined with an outer yttrium silicate erosion resistant layer and oxygen barrier is described. Thermodynamic computer calculations and finite element analysis have been used to design the coating. C/SiC samples have been coated using a combination of chemical vapour deposition and slip casting. The behaviour against oxidation of the coating has been evaluated.