| 电沉积nano-Al_2O_3/Ni+Co梯度复合镀层 |
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| 引用本文： | 刘燕,于思荣,任露泉,韩志武. 电沉积nano-Al_2O_3/Ni+Co梯度复合镀层[J]. 吉林大学学报(工学版), 2009, 0(Z1) |
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| 作者姓名： | 刘燕 于思荣 任露泉 韩志武 |
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| 作者单位： | 吉林大学地面机械仿生技术教育部重点实验室;吉林大学材料科学与工程学院; |
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| 基金项目： | 国家自然科学基金重点项目(50635030);;国家重大基础研究项目(2007CB616913) |
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| 摘 要： | 采用电沉积方法以灰铸铁为基体制备了金属与纳米陶瓷复合镀层,基质金属为镍钴,第二相纳米陶瓷颗粒选用Al2O3。通过表面形态观察可知,由于纳米颗粒的高活性表面为沉积过程提供了大量的核心,使得复合镀层较金属镍钴镀层组织致密,晶粒细小。线扫描成分分析表明:镀层中纳米颗粒含量呈梯度分布。对其显微硬度进行测量,结果显示:复合镀层显微硬度由表层到里层呈梯度分布。耐磨性试验表明:复合镀层中Al2O3纳米颗粒产生的弥散强化效应和晶粒细化效应使复合镀层耐磨性显著优于纯镍钴镀层。对复合镀层和纯镍钴镀层磨损形貌的观察分析表明:复合镀层磨损表面出现沿摩擦副运动方向的犁沟,而纯镍钴镀层磨损表面呈现大片剥落,磨损机制为黏着磨损。
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| 关 键 词： | 材料表面与界面 复合电沉积 梯度复合镀层 纳米氧化铝 组织 耐磨性 |
nano-Al_2O_3/Ni+Co gradient composite coating by electrodeposition |
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| LIU Yan,YU Si-rong,REN Lu-quan,HAN Zhi-wu. nano-Al_2O_3/Ni+Co gradient composite coating by electrodeposition[J]. Journal of Jilin University:Eng and Technol Ed, 2009, 0(Z1) |
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| Authors: | LIU Yan YU Si-rong REN Lu-quan HAN Zhi-wu |
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| Affiliation: | 1.Key Laboratory for Terrain-Machine Bionics Engineering;Ministry of Education;Jilin University;Changchun 130022;China;2.College of Materials Science and Engineering;China |
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| Abstract: | The metal and nano-ceramic nanocomposite coatings were prepared on gray cast iron surface by electrodeposition method.The nickel and cobalt were used as metal matrix,and the nano-Al2O3 was chosen as secondphase particulates.To avoid bad interface bonding and stress distribution,the gradient composite coating was prepared.Due to the high actively surface of nanoparticles provides an amount of nucleus the morphology of composite coatings was flatter and microstructure was denser than pure nickel and cobalt co... |
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| Keywords: | surface and interface of materials composite deposition gradient composite coating nano-Al2O3 microstructure wear-resistance |
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