| LI Hua,LI Liuhe,LI Duoduo,TANG Ling,LUO Yang,HAN Mingyue,ZHENG Yingxiao,SONG Wanwan.Effect of Modulation Periods on Erosion Performance of CrNx/TiAlSiN Multilayer Coatings[J],53(19):82-92, 140 |
| Effect of Modulation Periods on Erosion Performance of CrNx/TiAlSiN Multilayer Coatings |
| Received:October 20, 2023 Revised:March 13, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.19.008 |
| KeyWord:arc composite magnetron multilayer coating modulation period erosion resistance damage mechanism |
| Author | Institution |
| LI Hua |
School of Mechanical Engineering and Automation, Beihang University, Beijing , China |
| LI Liuhe |
School of Mechanical Engineering and Automation, Beihang University, Beijing , China |
| LI Duoduo |
School of Mechanical Engineering and Automation, Beihang University, Beijing , China |
| TANG Ling |
School of Mechanical Engineering and Automation, Beihang University, Beijing , China |
| LUO Yang |
School of Mechanical Engineering and Automation, Beihang University, Beijing , China |
| HAN Mingyue |
School of Mechanical Engineering and Automation, Beihang University, Beijing , China |
| ZHENG Yingxiao |
Shenyang Aircraft Corporation, Shenyang , China |
| SONG Wanwan |
Shenyang Aircraft Corporation, Shenyang , China |
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| Abstract: |
| Particle erosion is a seriously problem threatening the safety of high-speed rotating mechanical components in a dusty service environment. TiAlSiN coatings with high hardness and some extent toughness is a kind of promising erosion protective ceramic hard coatings. In this paper, CrNx sublayers were introduced to explore its impacts on the erosion performance of TiAlSiN coatings at high angle sand erosion. On TC6 substrates, CrNx/TiAlSiN multi-layer coatings with different modulation cycles (1, 2, 4, 6, 8, 10) were prepared by combining arc ion plating and high-power pulsed magnetron sputtering. The sectional and surface morphology, phase composition, hardness, elastic modulus, toughness and adhesion strength between the deposited coating and the substrate were analyzed by scanning electron microscope (SEM), X-ray diffractometer (XRD), nano-indentation tester and scratch meter respectively. The erosion performance of the coating was evaluated on an erosion test platform, where the particle had an average size of 50 μm, a speed of 30 m/s and feed rate 2 g/min, and impacted at an angle of 90° relative to the sample surface. The results showed that the structure of CrNx/TiAlSiN multilayer coating were compact, composed of face-centered cubic structure c-(Ti,Al)N, c-Cr, c-CrN and hexagonal h-Cr2N phases. Owning to the arc ion plating, the co-deposited droplets during the CrNx introduction appeared on the surface of multilayer coatings. The (220) orientation from the TiAlSiN sublayer gradually disappeared, but the (111) diffraction plane gradually appeared. With the decrease of the modulation period, the number and size of the droplet defects on the coating surface slightly increased, and the diffraction peak intensity of h-Cr2N (300) and c-CrN (220) decreased gradually before increasing in the CrNx sublayer. The adhesion strength between the coating and the substrate increased yet not significantly with the reduction in the modulation period, which was in the range of 68-71 N. The hardness and elastic modulus gradually decreased with the modulation period, from (37.5±0.46) GPa and (339.92±1.85) GPa for single TiAlSiN coating to (31.2±0.40) GPa and (267.50±7.98) GPa for M10 obtained under the minimum modulation period. However, the toughness index H/E ratio almost presented an upward trend, from 0.110 to 0.116. The anti-erosion properties of the coatings seemed to be positively correlated with their toughness and accomplished the optimal for the sample M10. Its erosion rate, with a value of 0.008 mg/g, was only ~ 1/5 of the single-layer TiAlSiN hard coating, with a value of 0.045 mg/g. Moreover, the increased numbers of interface for the reduced modulation period along the thickness direction of the multi-layer structure seemed to play a great role in deflecting the propagation direction of cracks, improving the toughness of the coating, and thus enhancing the erosion resistance of the multilayer coatings. The eroded spot exhibits layer-by-layer spalling failure on the coating surface. The erosion damage mechanism is the interaction of lateral and vertical fatigue cracks during the repeatedly particles impacting. Introducing CrNx sublayers and adjusting its modulation periods with TiAlSiN sublayer is finally proved to be an effective way to improve the coating toughness, and enhance the erosion resistance of TiAlSiN coating. |
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