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金属学报  2012, Vol. 48 Issue (8): 957-964    DOI: 10.3724/SP.J.1037.2012.00298
  论文 本期目录 | 过刊浏览 |
双脉冲电沉积纳米晶Ni-CeO2复合镀层的微观结构及其高温抗氧化性能
周小卫,  沈以赴, 顾冬冬
南京航空航天大学材料科学与技术学院, 南京 210016
MICROSTRUCTURE AND HIGH TEMPERATURE OXIDATION RESISTANCE OF NANOCRYSTALLINE Ni–CeO2 COMPOSITE COATINGS DEPOSITED BY DOUBLE–PULSED ELECTRO DEPOSITION
ZHOU Xiaowei, SHEN Yifu, GU Dongdong
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016
全文: PDF(2750 KB)  
摘要: 在超声波振荡环境下, 用双脉冲电源在Watt-Ni电解液体系中电沉积了纳米晶Ni-CeO2复合镀层, 采用E-SEM, TEM 和XRD对镀层的形貌,微观结构及相组成进行分析; 通过循环氧化增重曲线和DSC曲线,比较研究了纯Ni镀层和Ni-CeO2复合镀层的高温抗氧化性能与热稳定性.结果表明, 超声波振荡能有效抑制纳米颗粒在镀液中的团聚;添加20 g/L CeO2, 可使Ni晶粒细化; 在873 K空气中退火处理2 h,复合镀层中的CeO2沿裂纹扩展间隙处析出并形成含有稀土元素的弥散相,可起到钉扎晶界和阻止热裂纹萌生的作用. 晶界作为Ni的快速扩散通道,促进稀土弥散相沿晶界析出并形成连续的致密氧化膜, 能有效抑制O与Ni原子在氧化膜中互扩散, 从而降低镀层的氧化速率. 通过测定不同升温速率下镀层DSC曲线的吸热峰对应温度, 由Kissinger方程求得Ni-CeO2复合镀层中Ni晶粒长大的表观活化能为243.3 kJ/mol,明显高于纯Ni的晶粒长大表观活化能(159.2 kJ/mol),吸热峰对应温度也较纯Ni镀层提高约130 K,因此Ni-CeO2复合镀层具有更高的热稳定性.
关键词 热稳定性 高温抗氧化性 双脉冲电沉积 活化能 Ni-CeO2    
Abstract:Ni–CeO2 nanocomposite coatings were successfully electrodeposited from a standard Watts–nickel solution by a pulsed current (PC) method under ultrasonic field (UF). The surface morphology, microstructural evolution and phase composition of both pure Ni and Ni–CeO2 coatings were characterized using E–SEM, TEM and XRD, respectively. The curves of oxidation kinetics and DSC analysis were employed to evaluate high temperature oxidation resistance and thermal stability of these coatings. The experimental results indicate that the effect of acoustic streaming produced by ultrasonic field can effectively promote the uniform distribution of CeO2 nanoparticles in electrolyte. The adding of 20 g/L CeO2 can make the Ni grains refined in the Ni–CeO2 coating. During annealing at 873 K for 2 h, a sort of precipitated phase named NiCe2O4 is formed along the edge of crack propagation in this coating to bond or heal up the existing grain–boundaries, and to make them far from the initiation and extension of thermal cracks. A large volume fraction of grain–boundaries act as diffusion channels to make NiCe2O4 precipitated and form a continuous and compact layer enriched with Ce alloying element leading to inhibition of mutual diffusion between O and Ni atoms in this layer and reduction of the oxidation rate. According to different endothermic peaks of DSC curves, the activation energy of crystallization calculated by Kissinger equation displays the better thermal stability of 243.3 kJ/mol for Ni grains in the Ni–CeO2 coating than 159.2 kJ/mol for pure Ni coating, and the corresponding endothermic peak is about 130 K higher than that of the latter.
Key wordsthermal stability    high temperature oxidation resistance    double–pulsed electro deposition    activation energy     Ni–CeO2
收稿日期: 2012-05-24      出版日期: 2012-08-11
ZTFLH:  TG172.5  
基金资助:

江苏省普通高校研究生科研创新计划资助项目CXLX12-0151

通讯作者: 沈以赴     E-mail: yifushen@nuaa.edu.cn
Corresponding author: Xiao-Wei ZHOU     E-mail: yifushen@nuaa.edu.cn
作者简介: 周小卫, 男, 1983年生, 博士生

引用本文:

周小卫 沈以赴 顾冬冬. 双脉冲电沉积纳米晶Ni-CeO2复合镀层的微观结构及其高温抗氧化性能[J]. 金属学报, 2012, 48(8): 957-964.
ZHOU Xiaowei SHEN Yifu GU Dongdong. MICROSTRUCTURE AND HIGH TEMPERATURE OXIDATION RESISTANCE OF NANOCRYSTALLINE Ni–CeO2 COMPOSITE COATINGS DEPOSITED BY DOUBLE–PULSED ELECTRO DEPOSITION. Acta Metall Sin, 2012, 48(8): 957-964.

链接本文:

http://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00298      或      http://www.ams.org.cn/CN/Y2012/V48/I8/957

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