Ti_3Al基合金微弧氧化膜的制备和性质  

Fabrication and Properties of Microarc Oxidation Coatings on Ti_3Al-Based Alloy

作　　者：李夕金[1] 程国安[1] 薛文斌[1] 程云君[2] 

机构地区：[1]射线束技术及材料改性教育部重点实验室北京师范大学材料科学与工程系,北京100875 [2]钢铁研究总院TiAl系金属间化合物研究中心,北京100081

出　　处：《航空材料学报》2007年第5期1-6,共6页Journal of Aeronautical Materials

基　　金：国家自然科学基金资助项目(10575011);北京市科技新星计划资助(9558102500)

摘　　要：利用微弧氧化方法在Ti3Al基合金上制备了厚度达120μm的陶瓷膜。研究了陶瓷膜的生长曲线,发现膜层厚度随着氧化时间的增加而增加,在不同氧化阶段生长速度不同,膜层以向外生长为主;显微结构和硬度分析都发现,陶瓷膜分为两层结构,即内层和外层,陶瓷膜内外层的主要物相是(Ti0.6A l0.2Nb0.2)O2相,外层中还有一定数量的无定形SiO2相;陶瓷膜的最大显微硬度可以达到基体硬度的3倍左右。显微划痕实验表明:膜与基体间结合力大于40N,膜与基体结合良好。电化学极化曲线测试显示陶瓷膜在3.5%盐水溶液中的耐蚀性与Ti3Al基体相比有较大的提高。Ceramic coating with a thickness of 120 m was fabricated on a Ti3 Al-based alloy by microarc oxidation in silicate electrolyte. The growth rates of the coating were different during processing with different time. The thickness of ceramic coating increased with increasing of treatment time. Both microstructure and microhardness showed a structure with two layers in the coating： the inner layer and the outer layer. The main phase constituent of the coating was （ Ti0.6Al0.2Nb0.2 ） O2. Microhardness of the coating was about 3 times as that of the substrate. Micro-scratch test revealed that there was a excellent adhesion between coating and substrate. The corrosion resistance of the coating was much better than that of the substrate.

关 键 词：TI3AL 微弧氧化 陶瓷膜 结构与性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]