Properties of induction brazing diamond/Ni-based alloy composite coating
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摘要: 以45钢为基体，采用感应钎涂工艺在其表面制备金刚石/镍基合金复合涂层，通过洛氏硬度计、磨粒磨损试验机对涂层进行硬度和耐磨性测试，采用超景深显微镜、扫描电子显微镜对涂层、钎料和金刚石形貌进行观察，采用EDS对金刚石表面微区进行成分分析，初步研究了复合涂层的微观形貌、磨损规律及机制. 结果表明，金刚石颗粒在镍基合金复合涂层中弥散分布，与钎料合金实现了良好的冶金结合. 随着金刚石含量增加，可显著提高复合涂层的硬度及耐磨性. 当金刚石质量分数为20%时，涂层的宏观硬度达到63 HRC，较纯钎料涂层提高1.5倍；在相同的磨损试验条件下，纯钎料涂层的磨损失重为0.335 4 g，金刚石含量为20%的复合涂层磨损失重为0.097 9 g，仅为纯钎料涂层的29.2%.Abstract: Diamond /Ni-based alloy composite coating was made on the surface of 45 steel by induction brazing process. The hardness and wear resistance of the coating were tested by Rockwell hardness tester and abrasive wear tester, and the morphology of the coating, brazing filler metal and diamond were observed by ultra-depth of field microscopy and scanning electron microscopy, the micro-region compositions on the diamond surface were analyzed by energy dispersive spectroscopy. The micro-morphology, wear laws and mechanisms of the coating were preliminarily studied. The results showed that the diamond is dispersed in the Ni-based alloy composite coating and achieved a good metallurgical bond with the brazing alloy. The increase in the content of diamond particles can significantly improve the hardness and wear resistance of the coating. When the mass fraction is 20%, the macrohardness reached 63 HRC, which was 1.5 times higher than that of the pure brazing coating; under the same wear test conditions, the wear loss of the pure brazing filler metal coating reached 0.335 4 g while the 20% diamond/Ni-based alloy composite coating was 0.097 9 g, which was only 29.2% of the pure brazing filler metal coating.
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Keywords:
- induction brazing /
- diamond /
- Ni-based alloy /
- wear resistance
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图 1 钎涂用镍基钎料粉末和金刚石颗粒形貌
Figure 1. Morphology of Ni-based solder powder and diamond particle for brazing coating. (a) Ni-based solder powder; (b) diamond particles
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图 2 不同金刚石含量的涂层表面微观形貌
Figure 2. Surface micromorphology of coatings with different diamond content. (a) 0%; (b) 5%; (c) 10%; (d) 15%; (e) 20%
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图 3 涂层表面金刚石形貌及碳化物层能谱图
Figure 3. Diamond morphology of coating surface and energy spectrum of carbide layer. (a) diamond morphology of coating surface; (b) energy spectrum of carbide layer
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图 4 不同金刚石含量的涂层横截面微观形貌
Figure 4. Micromorphology of the cross-section of the coating with different diamond content. (a) 0%; (b) 5%; (c) 10%; (d) 15%; (e) 20%
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图 5 20%金刚石含量的涂层磨损界面形貌
Figure 5. Worn interface morphology of coating with 20% diamond content
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图 7 金刚石含量对涂层耐磨性的影响
Figure 7. Effect of diamond content on the wear resistance of the coatings
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图 8 不同金刚石含量的涂层被磨损表面形貌
Figure 8. Worn surface morphology of coatings with different diamond content. (a) 0%; (b) 5%; (c) 10%; (d) 15%; (e) 20%
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图 9 磨损时间对20%含量金刚石涂层耐磨性的影响
Figure 9. Effect of wear time on the wear resistance of 20% diamond coating
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图 11 金刚石磨损形貌
Figure 11. Diamond wear morphology. (a) complete; (b) ground; (c) broken; (d) deciduous
表 1 复合粉末的成分(质量分数，%)
Table 1 Composition of composite powder
编号 镍基钎料 金刚石 1 100 0 2 95 5 3 90 10 4 85 15 5 80 20 
下载: 导出CSV
表 2 镍基钎料化学成分(质量分数，%)
Table 2 Chemical composition of Ni-based brazing
Cr B Si Fe C Ni 7 3.1 4.5 3.0 0.02 余量
下载: 导出CSV
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