崔长春,李奇林,谈志东,单大平,丁凯,韩锦锦,葛源.石墨烯改性Ni-Cr合金激光钎焊金刚石界面组织与力学性能研究[J].表面技术,2025,54(7):109-117.
CUI Changchun,LI Qilin,TAN Zhidong,SHAN Daping,DING Kai,HAN Jinjin,GE Yuan.Interface Structure and Mechanical Properties of Laser-brazed Diamond of Graphene-modified Ni-Cr Alloy[J].Surface Technology,2025,54(7):109-117 |
| 石墨烯改性Ni-Cr合金激光钎焊金刚石界面组织与力学性能研究 |
| Interface Structure and Mechanical Properties of Laser-brazed Diamond of Graphene-modified Ni-Cr Alloy |
| 投稿时间：2024-06-27 修订日期：2024-11-14 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.07.009 |
| 中文关键词: 激光钎焊 石墨烯 金刚石 微观组织 热损伤 耐磨性 |
| 英文关键词:laser brazing graphene diamond microstructure thermal damage abrasive resistance |
| 基金项目:国家自然科学基金(51905234);江苏省高等学校自然科学研究重大项目(22KJA460004);江苏省基础研究计划自然科学基金项目(BK20220692);江苏省研究生科研与实践创新计划(SJCX23_1635) |
| 作者 | 单位 |
| 崔长春 | 江苏理工学院，江苏 常州 213001 |
| 李奇林 | 江苏理工学院，江苏 常州 213001 |
| 谈志东 | 江苏理工学院，江苏 常州 213001 |
| 单大平 | 中国航发动力股份有限公司，西安 710021 |
| 丁凯 | 江苏理工学院，江苏 常州 213001 |
| 韩锦锦 | 江苏理工学院，江苏 常州 213001 |
| 葛源 | 熔创金属表面科技常州有限公司，江苏 常州 213164 |
|
| Author | Institution |
| CUI Changchun | Jiangsu University of Technology, Jiangsu Changzhou 213001, China |
| LI Qilin | Jiangsu University of Technology, Jiangsu Changzhou 213001, China |
| TAN Zhidong | Jiangsu University of Technology, Jiangsu Changzhou 213001, China |
| SHAN Daping | Aecc Aviation Power Co., Ltd., Xi'an 710021, China |
| DING Kai | Jiangsu University of Technology, Jiangsu Changzhou 213001, China |
| HAN Jinjin | Jiangsu University of Technology, Jiangsu Changzhou 213001, China |
| GE Yuan | Meltron Metal Surface Technology Changzhou Co., Ltd., Jiangsu Changzhou 213164, China |
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| 中文摘要: |
| 目的 针对采用Ni-Cr合金制备钎焊金刚石砂轮时金刚石表面石墨化严重、内应力较大等热损伤问题，采用不同含量的石墨烯改性Ni-Cr合金，制备钎焊金刚石试样，研究石墨烯含量对激光钎焊金刚石界面组织及力学性能的影响。方法 采用同轴送粉末法制备石墨烯改性钎焊金刚石试样，并分析质量分数为0.00%、0.01%、0.02%、0.03%的石墨烯改性钎焊金刚石试样的界面组织、物相、显微硬度、金刚石石墨化程度及金刚石颗粒的残余应力等，同时在相同工艺条件下制备不添加金刚石的石墨烯改性钎焊试样，并研究石墨烯改性钎焊层的耐磨性能。结果 金刚石表面与钎料的界面处存在显著的元素相互扩散现象，其中Cr元素在金刚石附近明显偏析，界面反应生成的片状化合物主要为Cr3C2。随着石墨烯含量的增加，界面区域的C、Cr元素明显减少，金刚石石墨化程度及残余应力降低。钎焊层晶粒明显细化。钎焊层的显微硬度由866.6HV逐步上升到1 119.0HV，平均摩擦因数从0.71降至0.61，磨损体积从4.03×10−2 mm3降至1.86×10−2 mm3。测试结果显示，当石墨烯的质量分数为0.03%时，钎焊金刚石石墨化程度及残余应力较低，且钎焊层具有更好的晶粒结构、耐磨性及更高的显微硬度。结论 在镍铬钎料中适量添加石墨烯，将降低钎焊金刚石石墨化程度及残余应力等，提高钎焊层的显微硬度和摩擦磨损性能。 |
| 英文摘要: |
| Compared with electroplated diamond grinding wheel and sintered diamond grinding wheel, the brazed diamond grinding wheel has the characteristics of high bonding strength, large grits exposure, and high grinding performance, which is widely used in the grinding of engineering ceramics, optical glass, etc. However, thermal damage such as graphitization and residual stress will occur during the brazing of diamond with Ni-Cr alloy, which reduces the grinding performance of the brazed diamond grinding wheels remarkably. In order to solve this problem, the work aims to investigate the effect of the graphene addition on the interface structure and mechanical properties of laser-brazed diamond. ANSI 1 045 steel with size of 100 mm× 35 mm×10 mm was used as the matrix, Ni-Cr powder was evenly mixed with graphene powder of different mass fractions, i.e. 0.00%, 0.01%, 0.02% and 0.03% separately. The graphene-modified Ni-Cr alloy was then mixed with diamond by ball milling according to the mass ratio of 7∶1. The samples were prepared on the matrix by laser brazing based on coaxial-powder feeding method. The brazed samples were tested and analyzed with SEM, XRD, Laser Raman spectroscopy, Vickers hardness tester, etc. The results showed that there was significant element diffusion at the interface between the diamond surface and the brazing alloy, and the width of diffusion layer was about 2 μm, in which the concentration distribution of Cr in the interface region was relatively high, and the Cr element was obviously segregated near the diamond grit. The flake compound formed by the interface reaction was mainly Cr3C2. With the increase of graphene content, due to its large specific surface area and excellent adsorption capacity, the reaction between the C element on the diamond surface and the Cr element in the brazing alloy was inhibited and reduced and the C and Cr elements in the interface region were significantly reduced. The carbides formed by the reaction at the interface between the diamond and the brazing metal were significantly reduced, and the morphology of carbides was transformed from dense small flakes to discontinuous large flakes. The degree of graphitization of the diamond was reduced, and the residual stress decreased from 1.049 GPa to 0.693 GPa, with a decrease of about 34%. The average grain size of the brazing layer was 3.8, 2.0, 1.8 and 0.7 μm, respectively, and the grain size gradually decreased, which was significantly refined. The micro-hardness of the brazing layer gradually increased from 866.6HV to 1 119.0HV. The average friction factor decreased from 0.71 to 0.61, and the wear volume decreased from 4.03×10−2 mm3 to 1.86×10−2 mm3, with a decrease of 53.8%. Additionally, the test results showed that when the mass fraction of graphene was 0.03%, the graphitization degree and residual stress of brazed diamond were lower, and the brazed layer had better grain structure, micro-hardness and wear resistance. It is proved that the addition of graphene to Ni-Cr alloy can reduce the thermal damage such as graphitization and residual stress of brazed diamond, enhance and improve the micro-hardness and the wear properties of the brazing layer separately. |
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