Microstructure and properties of laser cladding diamond-metal wear-resistant coating
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摘要:
在10～30 μm的细颗粒金刚石表面进行镀Cr处理，并将其与Ni-Cr-B-Si粉末混合置于碳钢表面，采用激光热源将预置粉末熔覆于碳钢表面制备耐磨涂层。结果表明：金刚石表面的增厚镀Cr层在激光高温热场中可有效保护金刚石，避免金刚石在高温下发生氧化及石墨化，且可使金刚石与金属基体间实现冶金结合。对涂层的金相、物相及形貌进行分析，发现金刚石可显著提升涂层的冷却速率，同时细化冷凝组织，提高其硬度并增强其耐磨性。添加质量分数为20%镀Cr金刚石的熔覆涂层的耐磨性较未添加镀Cr金刚石时的提升了4.6倍，摩擦系数降低近50%。
Abstract:The surface of 10 to 30 μm fine-grained diamond was plated with Cr, and the Cr- plated diamond was mixed with Ni-Cr-B-Si powder and placed on the surface of carbon steel. The wear-resistant coating was prepared by using a laser heat source to melt the preset powder on the surface of carbon steel. The results show that the thickened Cr coating on the diamond surface can effectively protect the diamond in the laser high-temperature thermal field, avoids oxidation and graphitization of the diamond at high temperatures, and achieves metallurgical bonding between the diamond and the metal matrix. The metallography, phase and morphology of the coating are analyzed, and it is found that the diamond can significantly improve the cooling rate of the coating, refine the condensing structure, increase the hardness, and enhance the wear resistance of the coating. The wear resistance of the cladding coating with a mass fraction of 20% Cr-plated diamond is 4.6 times higher than that of without diamond, and the corresponding friction coefficient is nearly 50% lower.
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Key words:
- diamond /
- surface metallization /
- wear-resistant coating /
- laser cladding
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图 2 镀Cr金刚石的SEM形貌和XRD图谱
Figure 2. SEM morphology and XRD pattern of Cr-coated diamond
SEM morphology of the Cr-coated diamond XRD pattern of the Cr-coated diamond
图 3 试样A、B、C激光熔覆层的XRD图谱
Figure 3. XRD patterns of the laser cladding layers of samples A, B and C
图 4 试样熔覆层的横截面尺寸及金相形貌
Figure 4. Cross-section size and metallographic morphology of sample cladding layers
图 5 试样A、B、C激光熔覆层不同部位的金相组织照片
Figure 5. Metallographic photos of different parts of laser cladding layers on samples A, B, and C
图 6 B、C试样熔覆层断口的SEM形貌
Figure 6. SEM Morphologies of fracture surfaces of sample B and C cladding layers
图 7 B、C试样熔覆层内部金刚石与基体结合的SEM形貌
Figure 7. SEM morphologies of diamond and matrix bonding inside the cladding layers of sample B and C
图 8 A、B、C试样沿平行或垂直于涂层熔合线方向的SEM及元素线扫描结果
Figure 8. SEM and element line scanning results along the directions parallel or perpendicular to the fusion line of cladding layer of sample A, B and C
图 9 A、B、C试样熔覆层不同位置的硬度值
Figure 9. Hardness values of cladding layers at different positions of sample A, B and C
图 10 试样A、B、C的摩擦磨损质量及摩擦系数测试结果
Figure 10. Test results of wear quality and friction coefficients of samples A, B and C
表 1 金刚石微粉外部杂质的ICP检测结果
Table 1. ICP detection results of external impurities in diamond powder
元素 质量分数 ω1 / % Si 0.003 2 Fe 0.001 9 Ni 0.000 3 Mn 0.000 3 Ca 0.002 7 Mg 0.003 1 合计 0.011 5 
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表 2 中碳钢基板的化学成分
Table 2. Chemical compositions of medium carbon steel substrate
元素 质量分数 ω2 / % C 0.440 Si 0.160 Mn 0.500 P 0.015 S 0.035 Fe 余量
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表 3 Ni-Cr-B-Si合金粉末的化学成分
Table 3. Chemical compositions of Ni-Cr-B-Si alloy powder
元素 质量分数 ω3 / % C 0.5～1.1 Si 3.5～5.5 B 3.0～4.5 Cr 15.0～20.0 Fe ≤5.0 Ni 余量
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