低压冷喷涂铝涂层微观结构与沉积特性研究

材料开发与应用, 2012, 27(6): 43-53.

低压冷喷涂铝涂层微观结构与沉积特性研究

邱善广 ^1, , 李相波 ^2, , 王佳 ^3, , 程旭东 ^4, , 柳敏志 ^5,

1.海洋腐蚀与防护重点实验室,中国船舶重工集团公司第七二五所,山东青岛266101;中国海洋大学化学化工学院,山东青岛266100

2.海洋腐蚀与防护重点实验室,中国船舶重工集团公司第七二五所,山东青岛266101

3.中国海洋大学化学化工学院,山东青岛266100

4.武汉理工大学,材料复合新技术国家重点实验室,湖北武汉430070

5.海洋腐蚀与防护重点实验室,中国船舶重工集团公司第七二五所,山东青岛266101;武汉理工大学,材料复合新技术国家重点实验室,湖北武汉430070

基金项目: 国防预研:长效防腐涂层低压冷喷涂制备技术,基金(51318030308)

关键词：低压冷喷涂 , Al-Al2O3涂层 , 沉积效率

Research on Microstructure and Deposition Mechanism of Aluminium Coatings Prepared by Low Pressure Cold Spray

低压冷喷涂技术是一种不同于高压冷喷涂技术的新型喷涂工艺.本文以体积比为3∶7的氧化铝粉末和铝粉的混合粉末为原料,以压缩空气为工作气体,利用低压冷喷涂设备在Q235钢基体上制备Al涂层,研究了温度、喷距、送粉速率和喷嘴横向移动速度等工艺参数对涂层沉积效率的影响.采用光学显微镜、扫描电镜,研究了涂层的微观结构和沉积特性.实验结果表明:在工作气体压力保持0.6 MPa不变的情况下,温度400℃、喷距25mm、送粉速率为30-40 g/min、喷嘴横向移动速度4.0m/min时,铝涂层沉积效率最佳；同时Al2O3陶瓷相的加入有利于涂层的沉积.

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