| SHEN Tong-wei,ZHU Li-hui.Comparison of Microstructure and Properties between TiN/TiCN/Al2O3/TiN and TiN/TiCN/Al2O3/TiCNO Multilayer Coatings[J],49(7):141-148 |
| Comparison of Microstructure and Properties between TiN/TiCN/Al2O3/TiN and TiN/TiCN/Al2O3/TiCNO Multilayer Coatings |
| Received:December 07, 2019 Revised:July 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.07.018 |
| KeyWord:TiCNO multilayer coating CVD microstructure mechanical properties friction and wear properties |
| Author | Institution |
| SHEN Tong-wei |
School of Materials Science and Engineering, Shanghai University, Shanghai , China |
| ZHU Li-hui |
School of Materials Science and Engineering, Shanghai University, Shanghai , China |
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| Abstract: |
| The work aims to compare the microstructure and properties of TiN/TiCN/Al2O3/TiN and TiN/TiCN/Al2O3/ TiCNO multilayer coatings. The two kinds of multilayer coatings were deposited on cemented carbides by chemical vapor deposition. The microstructure of coatings was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The nano-hardness and elasticity modulus of top-layer were measured by nano-mechanical testing system. The micro-hardness and adhesion strength coatings were tested by micro-hardness tester and scratch tester, respectively. The friction and wear properties of coatings were investigated by reciprocating tribometer. The grains of TiN and TiCNO top-layer displayed columnar and needle-like morphology, respectively. Compared with TiN top-layer, TiCNO top-layer had higher hardness and resistance to plastic deformation. However, the surface roughness and friction coefficient of the multilayer coating with TiCNO top-layer were higher, and its adhesion strength was lower than the multilayer coating with TiN top-layer. When the wear took place in the top-layer, the wear resistance of multilayer coating was determined by the performance of top-layer. The wear volume and wear rate of TiN/TiCN/Al2O3/TiN coating were 1.2 times of TiN/TiCN/Al2O3/TiCNO coating. When the wear occurred at the interface between top-layer and Al2O3 layer, the wear resistance was also affected by the adhesion strength. The wear volume and wear rate of TiN/TiCN/Al2O3/TiN coating were 82% of those of TiN/TiCN/Al2O3/TiCNO coating. Compared with TiN/TiCN/Al2O3/TiN coating, TiCNO top-layer of TiN/TiCN/Al2O3/TiCNO coating has higher nano-hardness, stronger resistance to plastic deformation and better wear resistance. The friction and wear properties of TiN/TiCN/Al2O3/TiCNO coating are expected to be enhanced by improving the surface roughness and adhesion strength. |
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