黄旭,徐伟麒,张家诚,江吉彬,练国富,黄文泰,胡新新,玉津宇.激光熔覆(Ni60+NbC)+h-BN@Cu涂层组织与性能研究[J].表面技术,2023,52(9):430-438, 468.
HUANG Xu,XU Wei-qi,ZHANG Jia-cheng,JIANG Ji-bin,LIAN Guo-fu,HUANG Wen-tai,HU Xin-xin,YU Jin-yu.Microstructure and Properties of Laser Cladding (Ni60+NbC)+h-BN@Cu Coatings[J].Surface Technology,2023,52(9):430-438, 468 |
| 激光熔覆(Ni60+NbC)+h-BN@Cu涂层组织与性能研究 |
| Microstructure and Properties of Laser Cladding (Ni60+NbC)+h-BN@Cu Coatings |
| 投稿时间：2022-08-21 修订日期：2023-01-08 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.039 |
| 中文关键词: 激光熔覆 NbC h-BN@Cu 硬度 XRD 摩擦磨损性能 |
| 英文关键词:laser cladding NbC h-BN@Cu hardness XRD friction and wear performance |
| 基金项目:福建省高校创新团队发展计划(闽教科〔2020〕12号);长服役期铝合金建筑模板制造关键技术及智能装备研发(2021H4107);福建省2022年中央引导地方科技发展资金项目(2022L3014) |
|
|
| Author | Institution |
| HUANG Xu | Fujian Key Laboratory of Intelligent Machining Technology and Equipment, Fuzhou 350118, China ;School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
| XU Wei-qi | School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
| ZHANG Jia-cheng | School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
| JIANG Ji-bin | School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
| LIAN Guo-fu | School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
| HUANG Wen-tai | School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
| HU Xin-xin | School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
| YU Jin-yu | School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 通过添加铜包覆六方氮化硼(h-BN@Cu)粉末，改善激光熔覆Ni基NbC涂层的性能。方法 采用激光熔覆技术，使用添加不同质量分数铜包覆六方氮化硼的镍基碳化铌复合粉末，在45钢基体表面沉积镍基复合涂层。利用扫描电子显微镜(SEM)和X射线衍射(XRD)设备，研究h-BN@Cu对Ni60/NbC的激光熔覆镍基复合涂层微观结构的影响，利用显微硬度计和布鲁克UMT-2摩擦磨损试验机及白光干涉模块，测量熔覆层的显微硬度、摩擦磨损系数和磨痕宽度。结果 熔覆层中的主相为Ni-Cr-Fe，除此之外还存在FeNi3、CrB、M7C3、NbC、M23C6、Cr2Nb等多种相。研究发现，添加的润滑相h-BN@Cu与硬质相NbC会发生部分分解，Nb原子和B原子进入熔池，与熔池中的Cr原子反应，生成CrB、Cr2Nb等，这些金属间化合物具有硬度高、耐磨性好等特点。当h-BN@Cu的质量分数为10%时，熔覆层的显微硬度为650HV1.0，摩擦系数为0.4，磨痕宽度为0.406 mm。结论 相比于不添加h-BN@Cu的Ni60/NbC熔覆层，添加h-BN@Cu的Ni60/NbC熔覆层的平均硬度略微下降，但熔覆层硬质相分布更加均匀，此时硬度仍为45钢基体硬度的3.1倍，摩擦系数降低约27%，磨痕宽度减小约21%。 |
| 英文摘要: |
| The performance of laser cladding Ni-based NbC coatings was improved by adding copper-clad hexagonal boron nitride (h-BN@Cu) powder. Nickel-based Niobium carbide composite powder with different mass fractions of copper coated with hexagonal boron nitride was deposited on the surface of 45 steel matrix by laser cladding technology. A scanning electron microscopy (SEM) was used to analyze the microstructure and hard phase distribution of the coating; The phase composition was analyzed with an energy dispersive spectroscopy (EDS); The phase in the coating was characterized by X-ray diffraction (XRD); The microhardness of the cladding layer was measured with a microhardness tester; The wear resistance of the cladding layer was tested with a Bruker UMT-2 friction testing machine, and a white light interference module was used. The three-dimensional topography of the wear scar was measured, and the wear volume was calculated. The results showed that the main phase in the cladding layer was Ni-Cr-Fe, and other phases such as FeNi3, CrB, M7C3, NbC, M23C6 and Cr2Nb existed. The study found that when h-BN@Cu was not added, the cladding layer was mainly composed of Ni-Cr-Fe, FeNi3, CrB, M7C3, NbC, M23C6 and other phases, and the shape of NbC particles was mainly irregular polygons. After the addition of h-BN@Cu, the unmelted h-BN phase in the cladding layer increased, and the NbC morphology changed to a cross-like and petal-like structure, and the other phase compositions did not change significantly. This was due to the coating effect of Cu powder, which prevented the melting of part of h-BN, while with the increase of h-BN@Cu content, the laser absorption efficiency during the cladding process was improved, so that the molten pool absorbed more energy and promoted NbC particles disintegrate and re-grow. And after the addition of h-BN@Cu, the reflectivity of the laser was reduced and the dilution rate was increased. Excessive addition of h-BN@Cu would cause pores in the cladding layer and reduce the performance of the cladding layer. This was because after the addition of h-BN@Cu, the molten pool absorbed too much energy, which leaded to the decomposition of part of h-BN into B and N. N and O in the surrounding environment generated NO, which was then melted under the action of Marangoni flow. Pore defects were formed in the middle and lower part of the cladding layer, which affected the performance of the cladding layer. When the h-BN@Cu content gradually increased, the wear resistance of the cladding layer first increased and then decreased due to the good lubricating properties of Cu and h-BN. When the h-BN@Cu content was 10%, the friction coefficient of the cladding layer was 0.4, the wear scar width was 0.406 mm, and the wear resistance was the best. Compared with the Ni60/NbC cladding layer without h-BN@Cu, the average hardness of the Ni60/NbC cladding layer with h-BN@Cu is slightly decreased, but the hard phase distribution of the cladding layer is more uniform, and the hardness is still 3.1 times that of the 45 steel matrix. The friction coefficient is reduced by about 27%, and the wear scar width is reduced by about 21%. The research results provide a reference for the preparation of nickel-based composite coatings with excellent performance. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号