Damage Analysis of TiN/Ti Coatings Under Cycling Impact with Hard Particles

doi:10.11933/j.issn.1007-9289.20170406003

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China Surface Engineering ›› 2017, Vol. 30 ›› Issue (5) : 28-35. DOI: 10.11933/j.issn.1007-9289.20170406003

XU Wei-sheng, HE Guang-yu, CAI Zhen-bin, LIAO Bin, CAO Xin and HE Wei-feng

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Hard thin coatings deposited on blades of the compressor of an aircraft engine can improve the anti-erosion performance; however, the coatings hardly protect particle damage with a high impact angle and brittle cracks occur easily. A kinetic energy controlled cycling impact test was applied to simulate the normal impact to coatings. The influence of the volume fraction and layers on the impact damage of TiN/Ti coatings was investigated. The failure mechanism of coatings was analyzed through damage characteristics, impact mechanics response, and stress distribution. The results show that spalling and circular crack failures occur in TiN/Ti coatings. The spalling and circular cracks are induced by high stress gradient existing in the hard layer and the interface between the hard layer and the adhesive/transition layer, tensile stress in the upper surface of the hard layer at the edge of the impact zone, and material pilling under cycling impacts. The impact dynamic response remarkably differs with volume fractions and layers. The bilayer coating with a volume fraction of 3:1 shows better anti-impacting performance among different volume fractions, and the coatings with 4 layers shows better anti-impact performance among different layers sharing the same volume fraction of 9:1.

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TiN/Ti coating;cycling impact;engine-blade;energy absorption rate;contact force

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XU Wei-sheng, HE Guang-yu, CAI Zhen-bin, LIAO Bin, CAO Xin and HE Wei-feng. Damage Analysis of TiN/Ti Coatings Under Cycling Impact with Hard Particles[J]. China Surface Engineering, 2017, 30(5): 28-35 https://doi.org/10.11933/j.issn.1007-9289.20170406003

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2023-12-19

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