The Influence of Temperature on the Wear Mode and Deterioration of Coatings Used For Titanium Aircraft Engine Components
The Influence of Temperature on the Wear Mode and Deterioration of Coatings Used For Titanium Aircraft Engine Components
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DOI：
10.1080/10402000208982539
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发表时间：
2002-01
影响因子：
2.1
通讯作者：
A. Freimanis;A. Segall;J. C. Conway;E. Whitney
中科院分区：
文献类型：
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作者：
A. Freimanis;A. Segall;J. C. Conway;E. Whitney
研究了喷气发动机钛合金压气机叶片与转子之间的界面，以确定Cu-Ni-In防护涂层问题退化的机理。结果表明，在221℃的工作温度下，钛从未涂层的圆盘上转移到叶片上较软的Cu-Ni-In涂层上。这反过来又产生了钛对钛的接触，导致微动磨损。在454℃的高温下，铜偏析是主要的变质机制。为了模拟这些磨损模式并评估候选涂层，开发了一种独特的测试程序，其中包括一系列总滑移尺度位移。通过该测试程序对钴、钼、碳化钨和镍基涂层进行了评估，首先是低周期的总滑移位移（125μm），然后是高周期的总滑移减小（25μm）。研究结果表明，一种无润滑的纯钴涂层可以保护叶片，而不会在高温下损坏磁盘。虽然没有涂层在较低温度下表现异常，但纯钼显示出一些希望。
The interface between titanium compressor blades and rotors of jet engines was studied to determine the mechanisms responsible for problematic deteriorations of protective Cu-Ni-In coatings. Results indicated that at operational temperatures of 221 °C, titanium from the uncoated disk was transferred to the softer Cu-Ni-In coating on the blade. This in turn created titanium on titanium contact and resulted in fretting wear. At higher temperatures of 454 °C, copper segregation appears to be the dominant deterioration mechanism. In order to simulate these wear modes and evaluate candidate coatings, a unique testing procedure was developed that included a range of gross-slip scale displacements. Cobalt, molybdenum, tungsten carbide, and Nickel-based coatings were evaluated by this testing procedure that first involved a low-cycle series of gross-slip displacements (125μm), followed by a higher cycle series in a reduced (25μm) gross-slip regime. Results of the study revealed that an unlubricated pure-cobalt coating could protect the blade without damaging the disk at elevated temperatures. While no coatings performed exceptionally at lower temperatures, pure molybdenum exhibited some promise.