| 摘要: |
| 以HVOF梯度功能涂层在结晶器的应用作为研究背景,对CrZrCu表面超音速火焰喷涂CoNiCrAlY+CoCrMoSi梯度涂层与Ni-Co电镀层进行了对比分析,通过SEM,EDS,XRD及X射线应力仪等手段分析了涂/镀层的微观组织结构与应力状态,采用拉伸法测试了结合强度.结果表明,涂层与基体之间的结合比镀层较为紧密;梯度涂层的结合强度远大于镀层的结合强度;涂层均为压应力,表面应力小,界面应力大;镀层中元素和相组成无变化,涂层主要元素含量与粉末基本相当,而涂层中C,O元素含量增加,粉末发生了熔化分解和重结晶.为结晶器HVOF涂层部分性能替代电镀层提供了理论支持. |
| 关键词: 超音速火焰喷涂 梯度功能涂层 组织结构 结合强度 残余应力 |
| DOI： |
| 分类号: |
| 基金项目:哈尔滨市青年科技创新人才资金资助项目(2010RFQXG031) |
|
| Microstructures and adhesive strength of functionally gradient coating on crucible substrate sprayed by HVOF |
|
WANG Jiajie1,2, ZHANG Ying3, MO Shuhua1, WANG Guoxing1, LI Xianshuang1
|
|
1.Department of Materials and Chemistry Engineering, Heilongjiang Institute of Technology, Harbin 150050, China;2.State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China;3.Harbin Institute of Large Electrical Machinery, Harbin 150040, China
|
| Abstract: |
| Based on the application of the functionally gradient coating on crucible substrate, the microstructures and bonding strength of CoNiCrAlY+CoCrMoSi coating deposited on CrZrCu substrate by HVOF process and Ni-Co electroplated coating were investigated. Adhesive strength was tested by adhesive stretching method. Microstructures, micro-region composition, phase structure and stress state of section surface of the coatings were investigated by means of SEM, EDS, XRD and X-ray. The results showed that, the bonding strength of gradient coatings was much greater than that of electroplated coating. Stress was compressive residual stress both on the coating surface and at the coating-substrate interface. The surface stress was small, but that was much greater at interface. The elements content and phase structures of electroplated coatings did not change. The main element content of coating was basically consist with original powder, but the contents of C and O element increased obviously. |
| Key words: high velocity oxy-fuel spraying functionally gradient coatings microstructures bonding strength residual stress |
