摘要
利用电弧喷涂技术、渗铝和扩散处理工艺,在铸铁表面制作了具有微冶金结合的18-8不锈钢耐热耐蚀涂层。采用光学显微镜,SEM及X射线衍射等方法,对经过不同渗铝和扩散处理工艺得到的涂层的组织形貌,相结构及成分进行了分析研究。并采用热疲劳试验对渗铝和扩散处理后涂层的结合强度进行评价。结果表明,通过渗铝和扩散处理,涂层与基体之间产生了微冶金结合,涂层的结合强度得到了显著提高。并且渗铝时间过长不利于提高涂层结合强度,应合理控制渗铝时间。
Corrosion-resisting and heat-resisting coatings of 18-8 stainless steel were made by arc spraying, aluminizing and diffusion treatment on cast iron. The microstructures and chemical compositions of coatings with aluminizing and diffusion treatment were studied by optical microscope, scanning electron microscope and X-ray diffraction. And the adhesive strength of coatings was evaluated by thermal fatigue tests. The results show that there is some regions with metallurgy bonding on the interface between coatings and substrates through aluminizing and diffusion treatment, therefore, the adhesive strength of coatings were improved greatly. And a long period of aluminizing time is adverse to the adhesive strength of coatings, so aluminizing time should be controlled well.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第10期61-64,共4页
Transactions of The China Welding Institution
关键词
电弧喷涂
渗铝
扩散处理
结合强度
arc spraying
aluminizing
diffusion
adhesive strength
