NiCrAlY薄膜对Sm_2Co_(17)磁体高温抗氧化性的影响  

Effect of NiCrAlY Coating on Oxidation Resistance of Sm_2Co_(17) Magnets at High Temperatures

作　　者：晏敏胜 何进[1,2] 冒守栋 杨丽景 聂霞 宋振纶 詹肇麟[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室,宁波315201

出　　处：《中国腐蚀与防护学报》2015年第2期183-188,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家科技支撑计划项目(2012BAE02B01);浙江省自然科学基金项目(Q14E010014);宁波市自然基金项目(2012A610053)资助

摘　　要：采用直流磁控溅射方法在Sm2Co17磁体表面制备Ni Cr Al Y薄膜,分别探讨了Ni Cr Al Y薄膜防护的Sm2Co17(Ni Cr Al Y/Sm2Co17)磁体在500,600和700℃空气中的氧化行为,测试了磁体的氧化增重和磁性能,并用SEM,EDS和XRD对薄膜的微观形貌、化学成分和相组成进行表征。结果表明,Ni Cr Al Y薄膜在600℃以下可明显减缓O向Sm2Co17基体的扩散速率,提高Sm2Co17磁体的抗氧化性;当氧化温度升高到700℃,Ni Cr Al Y薄膜的防护效果有所下降。在高温氧化过程中,Ni Cr Al Y薄膜选择性氧化形成富Al2O3的致密氧化膜,可提升薄膜的高温抗氧化性能。Air oxidation behavior of Sm2Co17 magnets coated with magnetron sputtered Ni Cr Al Y coating was studied at 500, 600 and 700 ℃ in terms of variations of mass gains and magnetic properties. Microstructures, chemical composition, and phase constitution of the coating were analyzed by using scanning electron microscopy(SEM) with energy dispersive spectrometer(EDS) and Xray diffraction(XRD). The results show that the Ni Cr Al Y coating can improve the oxidation resistance of Sm2Co17 magnets in air at 500 and 600 ℃, and its protectiveness declined with the increase of temperature up to 700 ℃. During the oxidation process, the Al atoms moved to the surface and combined with the oxygen atoms to form an oxide film on the surface of Ni Cr Al Y coating, which can effectively maintain the oxidation resistance of Ni Cr Al Y coating.

关 键 词：NiCrAlY薄膜 Sm2Co17磁体 氧化 磁性能 磁控溅射 

分 类 号：TB383.2[一般工业技术—材料科学与工程]