Mechanical Properties and Crack Growth Behaviors of High-Temperature Protective Coatings by Low-Pressure Plasma Spray.
Mechanical Properties and Crack Growth Behaviors of High-Temperature Protective Coatings by Low-Pressure Plasma Spray.
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低压等离子喷涂高温防护涂层的机械性能和裂纹扩展行为。
DOI：
10.1299/kikaia.60.2538
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. Miyazaki
中科院分区：
文献类型：
--
作者：
Y. Itoh;M. Saitoh;M. Miyazaki
低压等离子喷涂工艺已在燃气轮机领域建立，用于在高温下暴露于腐蚀性气体的零件（涡轮机叶片、管道段等）。基于MCrAlY合金系统（M是Ni、Co或Fe）的覆盖涂层通常用作抗氧化和抗腐蚀涂层。采用有限元方法，从应力强度因子的角度分析了涂层从涂层表面到基体的裂纹扩展行为。通过测量11种MCrAlY合金涂层的杨氏模量和热膨胀系数，研究了涂层对裂纹从涂层表面向基体扩展的抑制作用。结果表明，MCrAlY涂层具有较低的弹性模量和热膨胀系数，有利于防止裂纹从涂层表面向基体扩展
The low-pressure plasma spray coating process has been established in the field of gas turbines and is used for parts (turbine blades, duct segments, etc. ) which are exposed to corrosive gases at high temperatures. Overlay coatings based on the MCrAlY alloy system (M is Ni, Co or Fe) are commonly employed as oxidation-and corrosion-resistant coatings. Crack growth behaviors of coatings from coated surface to substrate were analyzed in terms of the stress intensity factors using the finite-element method. Prevention of crack growth from the coated surface to the substrate was also investigated by measuring Young's modulus and thermal expansion coefficient for eleven kinds of MCrAlY alloy coatings, which were sprayed by the low-pressure plasma spray and heat-treated at 1393 K for 2 h in Ar atmosphere. Results showed that the MCrAlY coatings with low Young's modulus and low thermal expansion coefficient were useful for preventing crack growth from the coated surface to the substrate