摘要
为了研究冷喷涂Cu/Ni/Al复合涂层内部粒子间的结合特性,采用冷喷涂技术制备了Cu/Ni/Al复合涂层,并通过真空热处理在颗粒界面形成金属间化合物的方法来判定粒子间结合相对强弱。采用光镜、扫描电镜以及聚焦离子束对喷涂粉末、真空退火前后涂层的显微组织结构特点进行表征。结果表明,冷喷涂层组织致密,气孔率低;3种粒子变形程度不同,其中Al粒子的变形程度最大,形成连续相;真空热处理后,在涂层内部结合较好的粒子界面处形成较厚的金属间化合物,且该金属间化合物层越厚表明此处粒子间结合更好;涂层中粒子间的结合方式以机械结合为主。
In order to research bonding characteristics of particles in cold spraying Cu/Ni/Al composite coating, cold spraying technology was used for Cu/Ni/Al composite coating preparation, the interparticle bonding features were judged by an intermetallic method produced with post-spray vacuum heat treatment. The microstructural characteristics of the spraying powders and the heat-treated coating were investigated by optical microscope, scanning electron microscope and focused ion beam. The results showed that the coating was compact and low porosity; the deform degree of 3 particles were different, and Al particles had the maximum deformation and formed the continuous phase; after vacuum heat treatment, thick intermetallics was formed in particle interface of coating internal, and the thicker the intermetallics was, the better the particle bonding was. Mechanical interlocking was the main bonding mechanism in the composite coating between particles.
出处
《焊管》
2018年第1期15-20,共6页
Welded Pipe and Tube
基金
新金属材料国家重点实验室开放基金(2013-ZD07)对本课题的支持
