摘要
采用液体燃料氧气-空气混合助燃超音速火焰喷涂(HVO/AF)工艺在45钢表面制备WC-Co涂层,采用扫描电镜(SEM)、X射线衍射(XRD)表征了涂层的微观结构及相组成,并对涂层的孔隙率、显微硬度和结合强度进行了分析。研究结果表明,采用液体燃料氧气-空气混合助燃超音速火焰喷涂制备的涂层均具有较好的性能,超音速火焰喷涂氧气与空气混合比例对涂层的性能影响较大,采用HVO/AF喷涂技术能有效地抑制WC的氧化和分解,降低了涂层的孔隙率,提高了WC-Co涂层的硬度和结合强度等性能。涂层质量要好于传统的氧气助燃超音速火焰喷涂。
WC-Co coatings were prepared by HVO/AF on 45 steel.The properties such as microstructure,phase composition were investigated by SEM and XRD.Porosity,microhardness and bond strength of WC-Co coating were studied and analyzed.The results showed that the coating prepared with HVO/AF has better performance,and the mixing ratio between oxygen and compressed air has great influence on the performance of the coating.The HVO/AF spraying technology can effectively control the decomposition and oxidation of the WC,so the porosity is decreased and the microhardness and the bonding strength are increased significantly.The coating has better quality than that of the traditional HVOF spraying.
出处
《焊接》
北大核心
2008年第8期49-52,共4页
Welding & Joining
基金
天津市科技发展计划科技攻关专项资助项目(043104011)
中国民航大学科研基金资助项目(06kys10)
