热处理对聚苯酯铝硅封严涂层硬度的影响
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摘要
研究了聚苯酯铝硅封严涂层硬度随温度的变化规律及其微观机理。采用显微维氏硬度计对涂层进行硬度测试;通过扫描电镜及能谱分析,研究了Si、Al等元素在基体、Ni5Al过渡层及聚苯酯铝硅涂层内的分布变化,以此对硬度测试结果进行了分析。结果表明:Ni5Al过渡层的硬度随热处理温度的升高而增加;聚苯酯铝硅涂层的硬度随热处理温度的升高整体呈下降趋势,当温度超过200℃以后,其硬度显著降低,400℃时硬度下降为室温下硬度的13.7%。聚苯酯铝硅涂层中Si元素向过渡层方向扩散,并在过渡层内部及与基体结合处聚集,生成SiO_2。温度越高,扩散现象越明显,过渡层硬度增强。此外,随热处理温度的升高,过渡层内部区域Al元素含量增高,也使过渡层硬度增大。当温度升高时,由于聚苯酯与Al Si热膨胀系数不同且聚苯酯发生晶型转变,导致组织疏松甚至形成孔洞,使涂层硬度降低。
The changes of the hardness of Al Si-polyphenylester seal coating with the temperature and its micromechanism were studied. The hardness of the coating was tested by micro Vickers hardness tester. The distribution changes of Si, Al and other elements in the matrix, Ni5 Al transition layer and Al Si-polyphenylester coating were studied by scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS). The hardness test results were analyzed. The results show that the hardness of the Ni5Al transition layer increases with the increase of heat treatment temperature. The hardness of the Al Si-polyphenylester coating decreases slowly with the increase of heat treatment temperature, when the temperature is over 200 ℃, the hardness of the coating decreases obviously, and the hardness at 400 ℃decreases to 13.7% of the hardness at room temperature. Si element in theAlSi-polyphenylester coating diffuses into the direction of the transition layer. The Si element accumulates at the interface between the transition layer and the matrix, and then SiO_2 forms. The higher the temperature is, the more obvious the diffusion phenomenon is, and the hardness of the transition layer increases. In addition, with the increase of heat treatment temperature, the content of Al in some regions of the transition layer increases,then the hardness of the transition layer increases. When the temperature increases, due to different thermal expansion coefficients of polyphenylester and Al Si, and the crystal transformation of polyphenylester, the microstructure becomes loose or even forms the holes, which can result in the decrease of the hardness of the coating.
The changes of the hardness of Al Si-polyphenylester seal coating with the temperature and its micromechanism were studied. The hardness of the coating was tested by micro Vickers hardness tester. The distribution changes of Si, Al and other elements in the matrix, Ni5 Al transition layer and Al Si-polyphenylester coating were studied by scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS). The hardness test results were analyzed. The results show that the hardness of the Ni5Al transition layer increases with the increase of heat treatment temperature. The hardness of the Al Si-polyphenylester coating decreases slowly with the increase of heat treatment temperature, when the temperature is over 200 ℃, the hardness of the coating decreases obviously, and the hardness at 400 ℃decreases to 13.7% of the hardness at room temperature. Si element in theAlSi-polyphenylester coating diffuses into the direction of the transition layer. The Si element accumulates at the interface between the transition layer and the matrix, and then SiO_2 forms. The higher the temperature is, the more obvious the diffusion phenomenon is, and the hardness of the transition layer increases. In addition, with the increase of heat treatment temperature, the content of Al in some regions of the transition layer increases,then the hardness of the transition layer increases. When the temperature increases, due to different thermal expansion coefficients of polyphenylester and Al Si, and the crystal transformation of polyphenylester, the microstructure becomes loose or even forms the holes, which can result in the decrease of the hardness of the coating.
引文
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[2]程旭东,高忠宝,李其连,等.高温封严涂层材料的基本性能研究与评价[J].表面技术,2008,37(4):21-22.
[3]刘正发,温凤春,王铮,等.叶片转速对铝硅聚苯酯涂层刮磨性能的影响[J].表面技术,2016,45(9):112-117.
[4]何勇.聚苯酯铝硅涂层在航空发动机上的应用与研究[J].中国表面工程,1995(2):14-15.
[5]刘永,滕志强,施国梅,等.铝硅渗层中不同硅含量对渗层及材料性能的影响[J].热加工工艺,2014,43(24):158-160.
[6]章德铭,任先京,腾佰秋,等.可磨耗封严涂层性能评价技术研究进展[J].热喷涂技术,2009(2):19-22.
[7]Oksuz M,Yidirim H.Structure and properties of AlSi/Polyester coating[J].Journal of Applied Polymer Science,2004,93:2437-2444.
[8]张俊红,鲁鑫,何振鹏,等.航空发动机可磨耗封严涂层技术研究及性能评价[J].材料工程,2016,44(4):94-109.
[9]蔡丽清.维氏硬度试验及其主要影响因素分析[J].物理测试,2008,26(5):21-23.
[10]贾鹏,宫劭佳.两种不同成分NiAl涂层性能的对比研究[J].中国民航大学学报,2011,29(2):32-35.
[11]赵琦,尹付成,赵满秀,等.硅对45钢热浸镀铝层真空扩散处理显微组织的影响[J].材料热处理学报,2011,32(10):50-55.
[12]杨争,于佩潜,谢美菊,等.聚苯酯的热分析研究[J].四川大学学报,2001,38(6):888-891.
[13]王冠.快冷与普通Al-Si钎料钎焊试样中Si元素的扩散行为研究[D].兰州:兰州理工大学,2005.