Al-Ti-O/ZrO2涂层高温性能的研究
2020-11-18
作者：鲜广1，赵海波2，鲜丽君2，何洪3，王晨丞1
单位：1四川大学机械工程学院；2四川大学分析测试中心；3柴油机高增压技术国防科技重点实验室
摘要：采用阴极电弧离子镀方法在镍基高温合金表面制备了Al-Ti-O/ZrO2涂层，采用扫描电镜和X射线衍射仪分析了涂层的组织形貌、成分和物相结构。结果表明，Al-Ti-O/ZrO2涂层是以Al-Ti-O层与ZrO2层交替堆积形成的层状组织，从表面观察到涂层组织呈球状；涂层的物相由m-ZrO2、t-ZrO2、TiO2和α-Al2O3组成。Al-Ti-O/ZrO2涂层与基底之间的NiCoCrAlSiY合金粘结层具有改善涂层结合性的作用，压痕法测试Al-Ti-O/ZrO2涂层与镍基高温合金基底的结合等级为HF2。高温处理试验表明，Al-Ti-O/ZrO2涂层有效保护了镍基高温合金，经过1000℃~1200℃高温保温2h后，有Al-Ti-O/ZrO2涂层的镍基高温合金表面仍然完整；AlTiO/ZrO2涂层经过1100℃及以上温度的高温处理后，αAl2O3的结晶度明显改善。隔热试验表明，Al-Ti-O/ZrO2涂层在850℃恒温条件下的隔热温度达35℃以上。
关键词：阴极电弧离子镀；Al-Ti-O/ZrO2涂层；高温处理；抗氧化性；隔热
中图分类号：TG178文献标志码：ADOI：10.3969/j.issn.1000-7008.2020.11.007
Study on High Temperature Properties of AlTiO/ZrO2 Coating
Xian Guang，Zhao Haibo，Xian Lijun，He Hong，Wang Chencheng
Abstract:AlTiO/ZrO2 coating is prepared on nickel based superalloy by cathodic arc ion plating.The microstructure，composition and phase structure of the coating are analyzed by SEM and XRD.The results show that the AlTiO/ZrO2 coating is a layered structure formed by alternating accumulation of AlTiO layer and ZrO2 layer.The coating surface exhibites a spherical microstructure.The phase of the coating is composed of mZrO2，tZrO2，TiO2 and αAl2O3.The NiCoCrAlSiY bonding layer existe between AlTiO/ZrO2 coating and substrate improved the adhesion of the coating.The adhesion of AlTiO/ZrO2 coating on nickel based superalloy substrate is identified HF2 by indentation test.The result of the high temperature treatment showes that AlTiO/ZrO2 coating effectively protected the nickel base superalloy substrate.After holding at 1000℃~1200℃ for 2 hours，the surface of nickel base superalloy with AlTiO/ZrO2 coating is still intact.After high temperature treatment at 1100℃ and above，the crystallinity of αAl2O3 within AlTiO/ZrO2 coating is obviously improved.The thermal insulation test showes that the thermal insulation temperature of AlTiO/ZrO2 coating is above 35℃ at 850℃.
Keywords:cathodic arc ion plating; AlTiO/ZrO2 coating; high temperature treatment; oxidation resistance; heat insulation