| WANG Nan,ZHOU Yong.Supersonic Arc Spraying Coating NiTi Composite Structure and Tissue Characterization[J],45(9):76-81 |
| Supersonic Arc Spraying Coating NiTi Composite Structure and Tissue Characterization |
| Received:January 17, 2016 Revised:September 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.09.012 |
| KeyWord:supersonic arc spraying NiTi coating NiTi/NiAl mixed coating NiTi/Ni coating characterization of the organization |
| Author | Institution |
| WANG Nan |
School of Material Science and Engineering, Xi′an Shiyou University, Xi′an , China |
| ZHOU Yong |
School of Material Science and Engineering, Xi′an Shiyou University, Xi′an , China |
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| Abstract: |
| Objective To improve deficiencies of NiTi coating in engineering applications and find a superior performance surface coating material. Methods The 0Cr13Ni5Mo stainless steel substrate surface was preprocessed by washing with acetone (degreasing and derusting) and sandblasting (corundum particles). NiTi/Ni, NiTi and NiTi/NiAl mixed coatings were prepared on the substrate surface by HVOF technology. Microscopic structure, morphology and phase composition of the three coatings were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Meanwhile hardness test was conducted on hardness tester to measure thickness and hardness of the three coatings. The topography of bonding interface between substrate and coating was observed. Characterization of the organizational structures of three coatings were compared and studied. Results The average hardness of NiTi/Ni, NiTi and NiTi/NiAl were 574.3, 683.3 and 735 respectively; average thickness of NiTi/Ni, NiTi and NiTi/NiAl coating specimens were 279.3 μm, 270.5 μm and 229.4 μm respectively. The main organization of NiTi/Ni coating was Ni3Ti and Ni. The main organization of NiTi coating was NiTi(B2) phase, NiO, TiO and a small amount of NiO2. The main organization of NiTi/NiAl coating was NiTi, NiAl and a small amount of simple substance Ni and NiO2. Conclusion NiTi/NiAl mixed coating has the highest hardness and densest bonding interface with the substrate and enjoys strong antioxidant activity and more uniform organization. In general, NiTi/NiAl mixed coating with stable performance is expected to become an even more desirable coating material in engineering application. |
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