Abstract
TiAlN coatings with different Al ratios were deposited by the cathodic arc ion plating (AIP) method, and the relationship between solid particle erosion resistance and structural, mechanical properties was investigated by a micro slurry-jet erosion (MSE) test. The crystal structure of TiAlN coating changes depending on the Al ratio. The coating shows a B1 single cubic phase between the Al ratio of 0 and 0.58; above this ratio, formation of a B4 hexagonal phase is observed. The mechanical properties such as hardness and Young’s modulus of the TiAlN coating also depend on the Al ratio and the crystal structure. The erosion rate decreases by increasing the Al ratio up to 0.58, as the coating is a cubic single phase. The TiAlN coating shows the lowest erosion rate at an Al ratio of 0.58. The erosion rate increases drastically as the crystalline phase changes from the B1 cubic to B4 hexagonal phase at the Al ratio of more than 0.58. The change in erosion rate is also discussed in connection with mechanical properties such as erodent particle hardness to coating hardness ratio and coating hardness to Young’s modulus ratio.
Highlights
Erosion by hard and solid particles is commonly observed for various machine elements in many industrial applications, such as the blades used in gas and steam turbines [1,2,3]
The TiAlN coatings were deposited by cathodic arc deposition, and the relationship between the Al content and coating properties such as crystal structure, hardness and residual stress was studied
Althe ratios was investigated with developed micro slurryTiAlN
Summary
Erosion by hard and solid particles (solid particle erosion or SPE) is commonly observed for various machine elements in many industrial applications, such as the blades used in gas and steam turbines [1,2,3]. To prevent SPE, various surface modification techniques are used, such as cladding, thermal spraying, diffusion treatment [4], chemical vapor deposition (CVD) [5,6] and physical vapor deposition (PVD) Among these surface treatments, PVD coating is widely used for erosion resistant applications and various coating materials and architectures of coatings are investigated. The TiAlN coatings were deposited by cathodic arc deposition, and the relationship between the Al content and coating properties such as crystal structure, hardness and residual stress was studied. For these TiAlN coatings, SPE evaluation was conducted by our developed micro slurry-jet erosion (MSE) equipment using an impacting slurry-jet containing angular alumina particles
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