| 纳米CeO2对激光熔覆Ni基合金层组织与性能的影响 |
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| 引用本文： | 宋传旺,李明喜. 纳米CeO2对激光熔覆Ni基合金层组织与性能的影响[J]. 激光技术, 2006, 30(3): 228-231 |
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| 作者姓名： | 宋传旺 李明喜 |
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| 作者单位： | 1.华南理工大学, 机械工程学院, 广州, 510640; |
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| 基金项目： | 安徽省教育厅自然科学基金;安徽省科技厅科研项目 |
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| 摘 要： | 为了研究纳米CeO2颗粒对激光熔覆层的组织和性能的影响,在Q235钢基体上制备了加入不同量纳米CeO2的Ni基合金熔覆层,利用OLMPUS PME-3型光学显微镜,XD-3A型X射线衍射仪,HV-1000型显微硬度计,MM-200型环-块磨损试验机和扫描电镜等对激光熔覆层显微组织、相结构、显微硬度、磨损性能和磨损机理进行了研究。结果表明,在激光熔覆层中添加纳米CeO2能够细化组织,改变凝固组织的形态。当加入质量分数为1.5%的纳米CeO2时,熔覆层凝固组织形态为等轴树枝晶;生成了含Ce的新相Ce2Ni21B6,明显提高了熔覆层的显微硬度和耐磨性;熔覆层磨损由严重磨损转化为轻微磨损。但是加入过量的纳米CeO2,硬度反而降低。
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| 关 键 词： | 激光技术 激光熔覆 纳米CeO2 显微组织 显微硬度 耐磨性 |
| 文章编号： | 1001-3806(2006)03-0228-04 |
| 收稿时间： | 2005-07-08 |
| 修稿时间： | 2005-08-16 |
Effect of nano-CeO2 on the microstructure and properties of laser clad nickel-based alloy coating |
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| SONG Chuan-wang,LI Ming-xi. Effect of nano-CeO2 on the microstructure and properties of laser clad nickel-based alloy coating[J]. Laser Technology, 2006, 30(3): 228-231 |
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| Authors: | SONG Chuan-wang LI Ming-xi |
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| Affiliation: | 1. Department of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China ;2. Research Center for Laser Processing, Anhui University of Technology, Maanshan 243002, China |
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| Abstract: | The microstructure and properties of laser clad coating are introduced after adding nano particles.Nickel-based alloy powder with different addition of nano-CeO_2 is laser cladded onto Q235 steel substrate.The coating is examined to reveal the microstructure,phase composition,microhardness and wear resistance using optical microscope(OP),X-ray diffractometer(XRD),microhardness tester,block-on-ring wear tester and scanning electron microscope(SEM) respectively.The results show that fine dendrite and equiaxed dendrite are observed by adding nano-CeO_2.Equiaxed dendrite across the section is obtained when the additive reaches to 1.5%(mass fraction).A new phase(Ce_2Ni_(21)B_6) is found.The microhardness and wear resistance of the coating are much higher than those of the substrate,and further improved by adding nano-CeO_2.But the hardness decreased when the additive amount is much high.The mechanism of these effects is also discussed. |
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| Keywords: | laser technique laser clad nano-CeO_2 microstructure microhardness wear resistance |
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