Damage evolution and mechanism of TiN/Ti multilayer coatings in sand erosion condition

Study on the Damage Mechanism of TiN/Ti Coatings Based on Multi-Directional Impact

“…Those areas of high tensile stresses S11 are the main reason for the development of surface cracks. This type of stress pattern leads to the formation of circular cracks, which has been reported in many researches [2,8,30]. It can clearly be seen that the amplitudes of the tensile stresses at 90 • are larger than that of 60 • and 45 • .…”

“…The stress concentration phenomena easily occurs at the border between the bottom TiN layer and the substrate. Therefore, there is usually high tensile stress in the subsurface of the TiN layer, which has been mentioned in many reports [2,8]. When the stress concentration reaches the material strength of the TiN, micropore and microcracks form in the bottom TiN layer and are enlarged further, driven by the tensile stress ( Figure 7b) [34].…”

“…Especially for helicopters and transporters serving in the desert, the problem of solid particle erosion is more prominent and urgent. An anti-erosion coating has been considered as an effective way to improve the server life of aero-engines in the past decades [1][2][3][4]. Coatings also face erosion problems brought by solid particles, and the knowledge of the performance of the coating during erosion remains insufficient due to the complexity of the damage mode and mechanism [5,6].…”

A Method for Evaluating the Impact Wear Behavior of Multilayer TiN/Ti Coating

“…Due to the MEVVA process before the coating deposition, the adhesion strength between the coating and substrate is quite high. Therefore, the coating was assumed to be perfectly bonded to the substrate in the numerical model [15].…”

Key Problems Affecting the Anti-Erosion Coating Performance of Aero-Engine Compressor: A Review

“…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. However, the erosion issue in the field of aviation is quite different and more severe than the above [4][5][6][7], such as helicopters and transports taking off and landing in desert areas, as sand particles are sucked into the engine at high speed, as shown in Figure 1. High concentration of sand leads to serious damage to high speed rotating compressor located at the front of the engine [8], which may further lead to downgrade of engine performance, decrease in reliability and even shorter the service life.…”