| 摘要: |
| 为了研究喷涂参数对涂层性能的影响规律，采用高速电弧喷涂技术制备铝基非晶纳米晶复合涂层，利用正交试验法系统研究喷涂电流、喷涂电压、喷涂距离、喷枪移动速度和雾化空气压力对涂层性能的影响规律。优化后的工艺参数为喷涂电流160 A，喷涂电压36 V，喷涂距离200 mm，喷枪移动速度300 mm/s，雾化空气压力0.7 MPa，喷涂参数对涂层性能影响的主次顺序为：雾化空气压力、喷涂电压、喷枪移动速度、喷涂电流和喷涂距离。采用扫描电子显微镜(SEM)、能谱仪（EDS）、X射线衍射仪（XRD）和透射电镜（TEM）对工艺优化后的涂层进行分析，同时对涂层的显微硬度和孔隙率进行了测试。结果表明，采用优化参数制备的涂层组织结构致密，孔隙率为1.13%，硬度可达392 HV0.1，涂层具有明显的非晶纳米晶相，非晶含量约为24.2%。 |
| 关键词: 高速电弧喷涂 铝基非晶纳米晶 孔隙率 显微硬度 |
| DOI：10.11933/j.issn.1007-9289.2015.06.014 |
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| Spraying Process of Al-based Amorphous and Nanocrystalline Composite Coatings |
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ZHANG Qinliang, LIANG Xiubing, ZHANG Zhibin, CHEN Yongxiong, HU Yaoqiang
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National Engineering Research Center for Mechanical Product Remanufacturing, Academy of Armored Forces Engineering
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| Abstract: |
| To investigate the effect of spray parameters on coating properties, the Albased amorphous and nanocrystalline composite coatings were prepared by high velocity arc spraying technique under different spraying processes. The effects of spray parameters, such as spray current, voltage, distance, gun movement speed and air pressure on the coating characterizations were investigated. The orthogonal experiment results show that the optimum spraying process parameters are sprayed by a current of 160 A, spray voltage of 36 V, pray distance of 200 mm, gun transverse speed of 300 mm/s, and air pressure of 0.7 MPa. The primary and secondary orders of spray parameters on coating performance is air pressure, spray voltage, gun transverse speed, spray current, and pray distance. The microstructures of the coatings were analyzed by the scanning electron microscope (SEM), energy dispersive spetrometer (EDS), Xray diffraction (XRD) and transmission electron microscope (TEM). The microhardness and porosity of the coating were tested. The results show that the composite coatings under the spraying parameters have a compact structure with a low porosity of about 1.13%, and the microhardness value of 392 HV0.1. The volumn fraction of amorphous phase is 24.2%. |
| Key words: high velocity arc spraying Albased amorphous and nanocrystalline porosity microhardness |
