| TENG Da,GAO Shan,LIU Yunfeng,ZHOU Bingwen,ZHANG Xingguo.Effect of B4C-60Ni Addition on the Wear Resistance of WC-B4C-Ni Composite Coating[J],54(1):110-119 |
| Effect of B4C-60Ni Addition on the Wear Resistance of WC-B4C-Ni Composite Coating |
| Received:January 22, 2024 Revised:April 16, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.01.010 |
| KeyWord:HVAF titanium alloy B4C-60Ni WC10Co4Cr coating wear wear mechanism |
| Author | Institution |
| TENG Da |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
| GAO Shan |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China |
| LIU Yunfeng |
Ningbo Institute of Dalian University of Technology, Zhejiang Ningbo , China |
| ZHOU Bingwen |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China;Ningbo Institute of Dalian University of Technology, Zhejiang Ningbo , China |
| ZHANG Xingguo |
School of Materials Science and Engineering, Dalian University of Technology, Liaoning Dalian , China;Ningbo Institute of Dalian University of Technology, Zhejiang Ningbo , China |
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| Abstract: |
| Hard wear-resistant coatings can enhance the wear resistance of TC4 titanium alloy surface and prolong its service life. In this study, the 100 mm×100 mm×6 mm TC4 titanium alloy plate was selected as the substrate, and the WC10Co4Cr powder was mixed with different mass fractions (10%, 20%, 30%, 40%) of B4C-60Ni powder for spraying. WC10Co4Cr-B4C- 60Ni composite coatings with varying mass fractions of B4C-60Ni were prepared on the TC4 titanium alloy by high velocity air fuel (HVAF) technology. XRD was employed to analyze the phase of the coatings. Morphological analysis was conducted by SEM and EDS to explore the element distribution and wear morphology of the coating. The hardness distribution of the coating was analyzed with a Vickers-1000A hardness tester. Friction and wear experiments were conducted to analyze the wear resistance and wear mechanism of the composite coating. According to the results, similarities were observed in the phase of the composite coating, mainly including WC, B4C, Co3W3C, W2CoB2, Ni4B3, and Al3Ni phases. The WC and B4C hard phases were dispersed in metal bonding phases such as Co, Cr, and Ni, forming a multiphase structure. The coating thickness was distributed between 330 μm and 360 μm. At the interface, a strong bonding was observed between the coating and substrate, while the addition of B4C-60Ni made the interior of the composite coating denser without obvious pores. The coating displayed overall porosity of less than 1%, and the surface roughness was less than 3 μm. The coating had good flatness and high density. Compared to the TC4 substrate, the coating had a higher microhardness, which was evenly distributed in the thickness direction of the coating. Among them, the composite coating with a B4C-60Ni mass fraction of 10% had the highest microhardness of 1 228HV0.3, which was approximately four times that of TC4. With the increase of B4C-60Ni, the proportion of hard phase decreased relatively, leading to a decrease in the coating hardness. High hardness ensured good wear resistance. Under dry friction conditions at room temperature, the average friction coefficient of the coating in the stable stage was less than 0.5, and the wear mark depth of the coating was less than 15 μm, far less than the wear depth of the substrate (203 μm). The width of the wear marks on the coating was less than one-third of that on the substrate. The wear amount of the coating increased with the increase of B4C-60Ni mass fraction. Among these, the WC10Co4Cr-10B4C-60Ni coating demonstrated the greatest wear resistance with a volume wear rate of only 4.588×10–7 mm3/(N.m), which was four orders of magnitude lower than that of the bare TC4 substrate (3.059×10–4 mm3/(N.m)). The primary wear mechanisms observed in the coating are adhesive wear and fatigue wear. This observation indicates that the inclusion of an appropriate quantity of B4C-60Ni improves the densification of the coating, support and fill with the metal bonding phase, forming a hook claw locking structure between each other, thereby exhibiting excellent wear resistance. However, excessive addition of B4C-60Ni can lead to the decomposition of WC, resulting in a decrease in friction performance. |
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