| GENG Ming-zhang,WANG Wen-quan,ZHANG Xin-ge.Microstructures and Properties of Ni/Ti(C,N) Composite Cermet Coating Prepared by Electrospark Deposition[J],49(4):222-229 |
| Microstructures and Properties of Ni/Ti(C,N) Composite Cermet Coating Prepared by Electrospark Deposition |
| Received:June 30, 2019 Revised:April 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.04.025 |
| KeyWord:electrospark deposition H13 steel Ni/Ti(C,N) composite cermet coating microstructures wear resistance wear mechanism |
| Author | Institution |
| GENG Ming-zhang |
School of Materials Science and Engineering, Jilin University, Changchun , China |
| WANG Wen-quan |
School of Materials Science and Engineering, Jilin University, Changchun , China |
| ZHANG Xin-ge |
School of Materials Science and Engineering, Jilin University, Changchun , China |
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| Abstract: |
| The work aims to improve the surface wear resistance of H13 die steel and explore the application of cermet composite coating. The Ni/Ti(C,N) composite cermet coating was prepared on the surface of H13 steel by electrospark deposition with Ti(C,N)-based cermet rods and pure nickel rods as electrode materials and argon gas as shielding gas. The phase composition of the coating was analyzed by X-ray diffraction (XRD). Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to study the surface and cross-section morphologies and elements distribution of the coating. The microhardness and wear resistance of the coating under different loads were measured with a microhardness tester and a CSM ball-on-disk tribometer. The surface of the coating was sputtered by single-pulse deposition spots. Fe and Ti elements exhibited the characteristics of partition enrichment. The main phases of the strengthening layer included TiC0.7N0.3, Ni17W3, Ni-Cr-Co-Mo and Fe3Ni2. The coating had a uniform cross-section structure with few defects and a thickness of about 31 μm. Fe, Ti and Ni elements were all diffused at the interface to form a good metallurgical bond. The transition layer and the substrate were mixed with each other to present a mechanical occlusion structure. The measured microhardness of the coating was up to 1420 HV, which was about 5.4 times as much as that of the steel. The average friction coefficient of the coating was lower than that of the H13 steel substrate, and the wear weight loss within 30 min was only 1/2 of that of the substrate. The main wear mechanism of the coating was slight abrasive wear and adhesive wear. The Ni/Ti(C,N) composite cermet coating deposited on the surface of H13 steel can improve the hardness and wear resistance and has certain antifriction, which can play a role in prolonging the service life of the die. |
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