| Al2O3-TiO2对铝合金表面激光熔覆NiAl涂层组织性能的影响 |
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| 引用本文： | 雷临苹,叶宏,宋坤,卢秀华,郑杰,欧林南,冯凯. Al2O3-TiO2对铝合金表面激光熔覆NiAl涂层组织性能的影响[J]. 表面技术, 2018, 47(10): 145-150 |
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| 作者姓名： | 雷临苹 叶宏 宋坤 卢秀华 郑杰 欧林南 冯凯 |
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| 作者单位： | 重庆理工大学,重庆,430000;重庆理工大学,重庆,430000;重庆理工大学,重庆,430000;重庆理工大学,重庆,430000;重庆理工大学,重庆,430000;重庆理工大学,重庆,430000;重庆理工大学,重庆,430000 |
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| 基金项目： | 重庆理工大学研究生创新基金（YCX2016240）;重庆市大学生创新创业训练计划项目（201711660008） |
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| 摘 要： | 目的 进一步提高6061铝合金表面的硬度、耐磨性。方法 应用脉冲Nd:YAG激光器在6061铝合金表面制备了NiAl合金涂层和NiAl/Al2O3-TiO2复合涂层。通过SEM、X射线衍射仪系统研究了Al2O3-TiO2陶瓷相添加对NiAl熔覆层组织形貌、成分分布、物相组成的影响。利用HVS-1000硬度测试仪及HSR-2M高速摩擦磨损机,对熔覆层硬度分布及耐磨性进行测试分析。结果 Al2O3-TiO2陶瓷颗粒加入使涂层宏观成形质量明显提高,表面平整光滑、波纹均匀,熔覆层枝晶间距减小,组织结构明显细化。与NiAl熔覆层相比,在NiAl/Al2O3-TiO2复合涂层中,具有较高硬度的Al3Ni、Al3Ni2硬质相含量增大。同时,高硬度Al2O3和良好韧性的TiO2、NiTi金属间化合物在复合涂层内部形成。NiAl/Al2O3-TiO2复合涂层的显微硬度平均可达650HV0.2,相比NiAl涂层提高了300HV0.2;磨损体积仅为铝合金基体的1/9,相比NiAl涂层降低了35%。干摩擦条件下,NiAl/Al2O3-TiO2复合涂层的犁削、剥落现象显著降低。结论 在细晶强化、硬质相弥散强化及良好韧性的NiTi金属间化合物共同作用下,6061铝合金表面硬度和耐磨性得到显著提高。
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| 关 键 词： | 铝合金 激光熔覆 NiAl涂层 Al2O3-TiO2 组织 耐磨性 |
| 收稿时间： | 2018-03-23 |
| 修稿时间： | 2018-10-20 |
Effect of Al2O3-TiO2 on Microstructure and Properties of NiAl Coating by Laser Cladding on Aluminum Alloy |
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| LEI Lin-ping,YE Hong,SONG Kun,LU Xiu-hu,ZHENG Jie,OU Lin-nan and FENG Kai. Effect of Al2O3-TiO2 on Microstructure and Properties of NiAl Coating by Laser Cladding on Aluminum Alloy[J]. Surface Technology, 2018, 47(10): 145-150 |
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| Authors: | LEI Lin-ping YE Hong SONG Kun LU Xiu-hu ZHENG Jie OU Lin-nan FENG Kai |
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| Affiliation: | Chongqing University of Technology, Chongqing 430000, China,Chongqing University of Technology, Chongqing 430000, China,Chongqing University of Technology, Chongqing 430000, China,Chongqing University of Technology, Chongqing 430000, China,Chongqing University of Technology, Chongqing 430000, China,Chongqing University of Technology, Chongqing 430000, China and Chongqing University of Technology, Chongqing 430000, China |
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| Abstract: | The work aims to improve the abrasion resistance on 6061 aluminum alloy further. NiAl and NiAl/Al2O3-TiO2 composite coatings were prepared on the surface of 6061 aluminum alloy by pulse Nd:YAG laser. SEM and X-ray diffraction were used to investigate the effects of Al2O3-TiO2 ceramic phase on microstructure, element distribution and phase composition of NiAl coating. The hardness distribution and wear resistance of the coating were analyzed by HVS-1000 hardness tester and HSR-2M high-speed friction tester, respectively. Al2O3-TiO2 ceramic particles added to the cladding coating improved the quality of macromorphology and led to a smooth and uniform surface. The dendrite spacing decreased and the microstructure refined obviously. Compared with NiAl cladding coating, the amount of Al3Ni and Al3Ni2 with higher hardness in NiAl/Al2O3-TiO2 composite coating increased. Meanwhile, the Al2O3 reinforced phase and TiO2 and NiTi with better toughness were formed in the composite coating. The average microhardness of NiAl/Al2O3-TiO2 composite coating was about 650HV0.2, which was 300HV0.2 higher than that of NiAl coating and the wear volume was only 1/9 to matrix, which was 35% lower than that of NiAl coating. Under the condition of dry friction, the plowing and peeling of NiAl/Al2O3-TiO2 composite coating decreased significantly. With the combination effect of the grain refinements, dispersion strengthening and better toughness of the NiTi intermetallic compounds, the microhardness and abrasion resistance of 6061 aluminum alloy significantly improve. |
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| Keywords: | aluminum alloy laser cladding NiAl coating Al2O3-TiO2 microstructure abrasion resistances |
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