| WANG Yu-xin,DONG Yan-chun,JIANG Jie,LIU Jia-ning,TIAN Yun,CHEN Jing-bai,YANG Yong,HE Ji-ning.Microstructure and Properties of Ni60B-TiN Gradient Coating Synthesized by Plasma Reaction[J],52(4):138-146, 171 |
| Microstructure and Properties of Ni60B-TiN Gradient Coating Synthesized by Plasma Reaction |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.04.010 |
| KeyWord:reactive plasma spraying Ni60B-TiN composite coating composition gradient coating microstructure property |
| Author | Institution |
| WANG Yu-xin |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
| DONG Yan-chun |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
| JIANG Jie |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
| LIU Jia-ning |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
| TIAN Yun |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
| CHEN Jing-bai |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
| YANG Yong |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
| HE Ji-ning |
School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China;Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Tianjin , China |
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| Abstract: |
| In this study, Ni60B-TiN composite coatings with different TiN contents were prepared on 42CrMo steel substrates by reactive plasma spraying technology. By using the formation mechanism of TiN droplets generated by the combustion synthesis reaction of Ti powder with N2 during the plasma spraying process and deposited and solidified simultaneously with Ni-based alloy, Ni60B-TiN composite coatings with well-bonded interphase and dense organization were obtained. Considering the demand for surface strengthening and remanufacturing of mechanical equipment parts in practical engineering applications, a composition gradient coating with a certain thickness (600 μm) and excellent performance was designed and prepared based on the study of composite coatings. By comparing the microstructure and mechanical properties of Ni60B-TiN composite coatings with different TiN contents, the optimum composition content was selected as the working layer of the composition gradient coating, and the properties of the composite coating and the composition gradient coating were compared and analyzed. X-ray diffraction (XRD) was used to analyse the physical phase of the coating. Scanning electron microscopy (SEM) and an equipped energy spectrometer (EDS) were applied to observe and analyse the microstructure of the coating and the constituent elements in specific areas, the wear behaviour of the coating by observing the wear morphology and the toughness of the coating by observing the fracture morphology. A microhardness tester was used to measure the microhardness of the coatings, randomly measuring 20 points and characterising them with a Weibull distribution to obtain data on the hardness of the coatings. The wear resistance of the coating was measured by friction and wear testing machine (a GCr15 steel ball with a radius of 4 mm as a friction pair), and the wear volume of the coating was estimated by a microprobe. A three-point bending test was used to measure the curve relationship between the loading and the displacement center of the coating specimen, and the elastic modulus of the coating was calculated based on the elastic modulus formula derived from the bending model. The bonding strength of the coating was calculated by using the bonding specimen tensile method and the corresponding formula. The results show that Ni60B-TiN composite coating is mainly composed of Ni-base alloy phase (γ-Ni, Cr1.12Ni2.88, FeNi3) and TiN phase. The coating with 30wt.%TiN content has the best microstructure uniformity, the smallest wear trace width and wear volume (0.68 mm3), and has optimal wear resistance. Therefore, the composition gradient of TiN content in Ni60B-TiN gradient coating is selected as 0wt.%, 5wt.%, 10wt.%, 15wt.%, 20wt.%, 25wt.%, 30wt.%. By comparing the properties of the composite coating and the composition gradient coating, it is found that the internal stress of the gradient coating is effectively alleviated, and the problem of poor bonding due to the mismatch of physical properties between the coating and the substrate is improved. The elastic modulus of the coating is significantly enhanced (72 GPa), and the bonding strength is about 1.7 times higher than that of the composite coating, which improves the wear resistance and wear reduction performance of the coating. Ni60B-TiN composition gradient thick coating which can be widely used on the surface of mechanical parts has been successfully obtained. |
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