Abstract
Sand erosion has always been a key threat to the performance and service life of aero-engines. The compressor, the key component installed at the front of the aero-engine, suffers the most from sand erosion, especially compressors serving in deserts. Ceramic hard coating is a traditional way to improve the hardness and wear resistance of cutting and grinding tools. It may also be used to improve the erosion resistance of aero- engine compressor. However, the mechanism of erosion damage is complicated, which may include wear, secondary erosion, anisotropic erosion, impact, and fatigue. Recent research discovered the major problems with ceramic hard coating on aero-engine compressors. In this paper, these following problems are discussed: the design of coating material and structure, the preparation method and technology, the effects of droplets and clusters of coating surface, microstructure and characteristics of interface. The review of the major problems and possible solutions discussed in this paper may contribute to the future research on erosion coating theoretically and practically.
Highlights
Sand erosion is a common phenomenon in the industrial field [1,2,3], especially in area with both wind and sand such as power and energy equipment, resulting erosion on inner wall of the pipeline and so on
The collision velocity between sand particles and blade is calculated to be exceeding the speed of sound (340 m/s), and the velocity of blade tip can reach as high as 400–500 m/s
The mechanical strengthening of nano-multilayer coatings is essentially resulted by the hindrance of high density interface to dislocation movement in nano-thickness single-layer [36,37,38]
Summary
Sand erosion is a common phenomenon in the industrial field [1,2,3], especially in area with both wind and sand such as power and energy equipment, resulting erosion on inner wall of the pipeline and so on. Erosion has become a serious problem affecting the service in harsh environment of equipment, which needs to be solved urgently. In order to solve the problem of sand erosion of aero-engine compressors and improve the performance of service in desert, many methods have been tested, such as the design of special particle separation devices for aero-engines [9], a change of engine compressor material [10], and so on.
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