| 引用本文: | 朱剑威,李国栋,马飞,黄国龙,齐少豹,郭灵燕,李光,夏原.氟锆酸钾添加浓度对铝基PEO涂层热物理性能的影响∗[J].中国表面工程,2021,34(3):59~65 |
| Zhu Jianwei,Li Guodong,Ma Fei,Huang Guolong,Qi Shaobao,Guo Lingyan,Li Guang,Xia Yuan.Effects of K2FZr6 Concentration on Thermo-physical Properties of Aluminum Based PEO Coating[J].China Surface Engineering,2021,34(3):59~65 |
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| 氟锆酸钾添加浓度对铝基PEO涂层热物理性能的影响∗ |
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朱剑威1,2, 李国栋1,2, 马飞3, 黄国龙3, 齐少豹3, 郭灵燕3, 李光1,2, 夏原1,2
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1.中国科学院力学研究所 北京 100190;2.中国科学院大学材料科学与光电工程中心 北京 100049;3.潍柴动力股份有限公司 潍坊 261061
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| 摘要: |
| 为了研究氟锆酸钾(K2ZrF6 )添加对铝基 PEO 涂层热物理性能的影响。 在硅酸盐-氢氧化钠电解液体系下,通过掺杂不同浓度的氟锆酸钾 (0, 0. 5, 1. 5 和 3 g / L),使用等离子体电解氧化技术(PEO)在纯铝基体表面制备得到了氧化铝-氧化锆复合陶瓷涂层。 采用 DSC 以及 LFA 对涂层的热物理性能(比热容、热导率)进行了表征,并通过 SEM、XRD、EDS 等测试手段分析不同添加浓度下铝基 PEO 陶瓷涂层的显微形貌以及相结构组成,对其变化趋势及对热物理性能的影响机理进行讨论与分析。 结果表明:氟锆酸钾掺杂后,涂层相结构主要由 α-Al2O3 、γ-Al2O3 、莫来石与 t-ZrO2 组成;随着添加浓度的增加,陶瓷涂层的生长速率不断提高、内部的微孔数量增多、氧化锆含量持续上升,涂层密度先下降后增加,涂层表面出现局部放电现象;锆元素掺杂后涂层比热容呈现出波动下降趋势,热导率数值显著降低,当氟锆酸钾添加浓度为 1 g / L 时,涂层的热导率最低,为 0. 148 W/ (m·K),较添加前降低了 72. 5%。 对于纯铝基体,在硅酸盐体系电解液引入氟锆酸钾成分可以有效降低涂层的热导率,提高涂层的隔热性能。 |
| 关键词: 氟锆酸钾 等离子体电解氧化 陶瓷涂层 比热容 热导率 |
| DOI：10.11933/j.issn.1007-9289.20210208001 |
| 分类号:TG148 |
| 基金项目:国家自然科学基金资助项目(51871230,51701229) |
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| Effects of K2FZr6 Concentration on Thermo-physical Properties of Aluminum Based PEO Coating |
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Zhu Jianwei1,2, Li Guodong1,2, Ma Fei3, Huang Guolong3, Qi Shaobao3, Guo Lingyan3, Li Guang1,2, Xia Yuan1,2
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1.Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 , China;2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049 , China;3.Weichai Power Co., Ltd, Weifang 261061 , China
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| Abstract: |
| In order to explore the influence of K2ZrF6 on thermal-physical properties and improve the thermal insulation performance of aluminum based PEO coating, in this paper, plasma electrolytic oxidation (PEO) was used to deposit Al2O3 -ZrO2 ceramic coating on aluminum substrate with different K2ZrF6 addition ( 0, 0. 5, 1. 5and 3g / L) in the NaSiO3 -NaOH electrolyte. Thermo-physical properties of ceramic coating were tested by differential scanning calorimeter ( DSC) and laser flash met hod ( LFA), and the mechanism of that properties were discussed by analyzing the variation of surface / cross-section morphology, phase structure and element content using SEM, XRD andEDS. The result shows that ceramic coatings phase structure in K2ZrF6 containing electrolytes mainly consists of α-Al2O3 , γ-Al2O3 , mullite and t-ZrO2 ; with the increase of the K2ZrF6 , the growth rate and micro pore amounts increase, which means the micro-discharge is more intense through the reaction process; the density of coating decrease first and then increase, and the partial discharge appeared when the K2ZrF6 was 3 g / L. With the addition of K2ZrF6 , the specific heat capacity of the coating showed a fluctuating decreasing trend, and the heat conductivity decreased significantly. When the added concentration of K2ZrF6 was 1g / L, ceramic coating has the minimum heat conductivity of 0. 148 W/ (m·K), which is less than normal 8YSZ coating (1. 68 ~ 2 W/ ( m·K)) and decreased by 72. 5% compared with that before K2ZrF6 adding. Besides, the coating at 1g / L K2ZrF6 addition also has a lower volume heat capacity (681 kJ/ (m3·K)) compared with 8YSZ ( ＞2 500 kJ/ (m3·K)) and SiRPA coating (1 300 kJ/ (m3·K)). As the thermal barrier coating for internal combustion engine, characteristic of low volume heat capacity can prevent intake air heating and reduce the heat loss. In conclusion, for aluminum substrate, the addition of K2ZrF6 in silicate electrolyte can increase the amount of micro-pores, effectively reduce the thermal conductivity and improve the thermal insulation performance of PEO coating. |
| Key words: K2FZr6 PEO ceramic coating specific heat capacity heat conductivity |
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