摘要
为了提高冷喷涂铝涂层的硬度和耐磨性,把Al粉与α-Al2O3粉按照质量比3∶1进行混合,在汽车用AZ80镁合金表面冷喷涂Al-25%Al2O3涂层,对比该涂层与纯铝涂层的组织结构和耐磨性能。结果表明:Al-25%Al2O3复合涂层衍射峰与Al粉形成的衍射峰吻合,冷喷涂不会改变粉末的相结构;复合涂层和基体之间形成了紧密结合状态,在复合涂层内除包含Al板条之外,在板条中及其边界部位分布着许多弥散态的Al2O3颗粒;纯Al涂层获得了比AZ80镁合金更大的磨损率,Al-25%Al2O3复合涂层磨损率减小;摩擦膜脱落后铝基体形成犁沟并发生较大的塑形变形,表现为磨粒磨损的特征。
In order to improve the hardness and wear resistance of cold-sprayed aluminum coating,the Al powders were mixed with α-Al2O3 powders at a mass ratio of 3 ∶ 1,and Al-25% Al2O3 coating was cold sprayed on the surface of AZ80 magnesium alloy for automobile. The mechanical strength and wear resistance of the composite coatings and pure aluminum coatings were compared. Results showed that the diffraction peaks of Al-25%Al2O3 composite coating were consistent with those of coating formed by Al powder,indicating that the treatment of cold spraying had little influence on the phases composition of powders. A close bond state was observed between the composite coating and the substrate. In addition to the Al lath contained in the composite coating,many dispersive Al2O3 particles were distributed in the lath and its boundary parts. Furthermore,the wear rate of pure Al coating was higher than that of AZ80 magnesium alloy,while the wear rate of Al-25%Al2O3 composite coating declined. After the friction film fell off,the aluminum substrate furrowed and a large plastic deformation took place,which presented the characteristics of abrasive wear.
作者
陈斌星
陈伟
CHEN Bin-xing;CHEN Wei(Electrical and Electronic Engineering Institute,Zhejiang Industry Polytechnic College,Shaoxing 312000,China)
出处
《材料保护》
CAS
CSCD
北大核心
2019年第5期44-47,共4页
Materials Protection
基金
国家基金重大科研仪器研制项目(4142780076)资助
关键词
冷喷涂
AZ80镁合金
复合涂层
耐磨性
cold spraying
AZ80 magnesium alloy
composite coating
wear resistance
