Mechanical Properties of Low-Pressure-Plasma Sprayed MCrAlY Coatings.
Mechanical Properties of Low-Pressure-Plasma Sprayed MCrAlY Coatings.
复制标题
低压等离子喷涂 MCrAlY 涂层的机械性能。
DOI：
10.2472/jsms.43.690
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
K. Honda
中科院分区：
文献类型：
--
作者：
Y. Itoh;M. Saitoh;M. Miyazaki;K. Honda
采用低压等离子喷涂技术在MCrAlY合金表面制备了抗高温腐蚀和氧化的涂层。已发现该涂层工艺对于燃气涡轮机部件非常有效。然而，LPPS MCrAlY合金的机械性能，这对涂层寿命有重要影响，并不总是澄清。从LPPS厚涂层上加工出5种MCrAlY独立试样（CoCrAlY、CoNiCrAlY、CoNiCrAlY+Ta、NiCrAlY、NiCoCrAlY）。此外，热处理MCrAlY试样（1393K，2h，Ar气氛）在实验中使用。在室温下测量了LPPS MCrAlY合金的维氏硬度、杨氏模量、泊松比和四点弯曲强度，并与镍基高温合金IN738LC进行了比较。实验结果表明，LPPS MCrAlY合金中析出相铝的体积分数对合金的力学性能有重要影响。也就是说，有一种趋势，即维氏硬度和杨氏模量的增加与铝复合材料的体积百分比，相反，弯曲强度降低与铝复合材料的体积百分比的增加。
The low-pressure-plasma spray (LPPS) process is used to overlay coatings of MCrAlY alloy for protection against high temperature corrosion and oxidation. This coating process has been found to be very effective for gas turbine components. However, mechanical properties of LPPS MCrAlY alloy, which have an important effect on coating life, have not always been clarified. Five kinds of freestanding MCrAlY specimens (CoCrAlY, CoNiCrAlY, CoNiCrAlY+Ta, NiCrAlY, NiCoCrAlY) were machined from the thick LPPS coatings. Also, the heat treated MCrAlY specimens (1393K, 2h, Ar atmosphere) were used in experiments. The Vickers hardness, Young's modulus, Poisson's ratio and four point bending strength of the LPPS MCrAlY alloy were measured at room temperature in comparison with a nickel-base super-alloy, IN738LC. The experimental results suggest that the volume percentage of precipitated aluminum composite in the LPPS MCrAlY alloy has an important effect on the mechanical properties. Namely, there is a tendency that the Vickers hardness and Young's modulus increase with increasing the volume percentage of aluminum composite, and conversely the bending strength decreases with increasing the volume percentage of aluminum composite.