石绪忠,许康威,武笑宇.等离子喷涂纳米氧化铝钛涂层机械性能研究[J].表面技术,2018,47(4):96-101.
SHI Xu-zhong,Xu Kang-wei,WU Xiao-yu.Mechanical Behavior of Plasma Sprayed Nano-Al2O3/TiO2 Coatings[J].Surface Technology,2018,47(4):96-101 |
| 等离子喷涂纳米氧化铝钛涂层机械性能研究 |
| Mechanical Behavior of Plasma Sprayed Nano-Al2O3/TiO2 Coatings |
| 投稿时间：2017-12-05 修订日期：2018-04-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.04.014 |
| 中文关键词: 等离子喷涂 纳米氧化铝钛 机械性能 断裂韧性 杯突试验 摩擦磨损 |
| 英文关键词:plasma spraying nanostructured Al2O3/TiO2 mechanical performance fracture toughness cupping test friction and wear |
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| 中文摘要: |
| 目的 摸索纳米氧化铝钛喷涂工艺，并重点研究其机械性能。方法 采用大气等离子喷涂方法在金属表面制备了纳米结构的氧化铝钛系陶瓷涂层，固定喷涂电流、喷涂距离和送粉器转速，通过调整主气压强和喷涂电压，制备了四组工艺的热喷涂试样，优化了制备工艺。表征了优化后涂层的结合强度、显微组织、硬度及断裂韧性、杯突性能和抗热震性能，并研究了纳米陶瓷涂层在球盘模式下的摩擦和磨损性能。结果 综合涂层的显微硬度、裂纹抵抗能力和断裂韧性数据，确定了喷涂纳米陶瓷涂层AT13的最佳工艺。纳米陶瓷涂层结合强度及硬度较高，原始粉体的纳米组织可在涂层中得以遗传。纳米涂层抗杯突性能优异，韧性明显好于传统微米涂层，经过50次400 ℃～室温水淬循环试验后，涂层未出现任何失效。在大载荷的球盘摩擦磨损中，纳米陶瓷涂层的磨损量小，摩擦系数平稳，显示出了良好的耐磨性能。结论 纳米氧化铝钛陶瓷涂层的结合强度高、抗杯突性能优异、耐磨损，其综合机械性能良好，可用于苛刻工作环境。 |
| 英文摘要: |
| The work aims to explore nano-Al2O3/TiO2 spraying process, and study its mechanical properties emphatically. Nanostructured Al2O3/TiO2 ceramic coatings were fabricated on metallic surface in the method of atmospheric plasma spraying. Provided with permanent spraying current, spraying distance and powder feeder speed, thermal sprayed samples were prepared by applying four groups of process and adjusting main pressure intensity and spraying voltage, and the preparation technology was optimized. Bonding strength, microstructure, hardness, fracture toughness, cupping property and thermal shock resistance of the optimized coatings were characterized. Friction and wear properties of the nano-ceramic coatings in ball-disk mode were studied. The optimum process of spraying nano-ceramic coatings AT13 was determined by analyzing microhardness, crack resistance and fracture toughness data of the composite coatings. The bonding strength and hardness of nano-ceramic coatings were both high. The nanostructure in original coating was inherited from the coatings. The nano-coatings exhibited excellent cupping resistance, and better toughness than traditional micron coatings. After 50 cycles of water quenching at 400 ℃ to room temperature, no failure occurred in the coatings. During frictional wear of large load ball-disk, abrasion loss of nano-ceramic coatings was slight and friction coefficient was stable, the coatings showed good tribological properties. Nano-alumina titanium ceramic coatings feature in high bonding strength, excellent cupping resistance, wear resistance and good overall general mechanical performance, hence they are applicable to harsh working environment. |
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