摘要
Cr3C2-NiCr涂层是中高温下理想的耐磨、抗氧化、耐蚀涂层,常用于高温下的燃气冲蚀磨损、磨粒磨损、微动磨损、硬表面磨损等场合.文中采用超音速等离子喷涂的方法在CuCrZr合金表面制备Cr3C2-NiCr涂层,并采用超声冲击的方法对涂层进行后处理.结果表明,经超声冲击处理后,涂层孔隙率由2.34%降低至1.83%;涂层的平均显微硬度由8.9 GPa提高至9.6 GPa,且硬度分布更均匀;在650℃下进行热震试验,涂层的热震寿命显著提高,热震裂纹的扩展路径也发生了变化.
For the ideal resistance characteristics to wear,oxidation and corrosion,Cr3C2-NiCr coating has been widely used in the gas erosive wear,abrasive wear,fretting wear and hard surface wear under high temperature conditions.In this paper,Cr3C2-NiCr coating on CuCrZr was obtained by supersonic plasma-spraying method,and the post-processing ultrasonic impact treatment was utilized to certain coating.The results show that porosity of the coating decreases from 2.34 percent to 1.83percent,and average micro-hardness of coating increases from 8.9 GPa to 9.6 GPa and hardness distribution becomes uniform.Coating thermal shock life at 650 ℃ improves markedly; meanwhile,crack path of thermal shock also changes.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第2期95-98,118,共4页
Transactions of The China Welding Institution
基金
江苏高校优势学科建设工程资助项目
