CeO_2对金属镍-陶瓷涂层组织与性能的影响  

Influences of CeO_2 Powder Addition on Microstructure and Properties of Metal Ni/Ceramic Composite Coatings

作　　者：龙亚雄 谭澄宇[1] 唐子杰 曾凡[1] 夏长青[1] 古一[1] 

机构地区：[1]中南大学材料科学与工程学院有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《腐蚀与防护》2015年第2期187-191,205,共6页Corrosion & Protection

基　　金：军工配套项目(MKPT-04-106)

摘　　要：在BaO-Al2O3-B2O3体系玻璃相中分别磨加和熔加CeO2粉体(16%),同时加入适量的镍粉,成功地制备了含CeO2的金属镍-陶瓷复合涂层。利用XRD和DSC技术分析了CeO2粉体的存在状态以及对玻璃相软化温度的影响;采用热震试验和维氏硬度试验测试对比了CeO2添加方式对金属镍-陶瓷复合涂层性能的影响;根据宏观形貌观察并结合SEM/EDS微观分析了涂层的形貌特点以及界面结构。结果表明,添加16%CeO2粉末可显著改善BaOAl2O3-B2O3涂层体系的涂覆性能,并提高涂层与基体金属之间的结合力。熔加的CeO2粉末在玻璃块料中主要以立方萤石结构的形式存在,且对玻璃相软化温度无明显影响。与磨加方式相比,熔加的CeO2颗粒更为细小,分布更加均匀。By melting and grinding 16% CeO2 powder into B2O3-Al2O3-BaO glass and then adding appropriate amount of nickel powder,a novel metal Ni/ceramic composite coating containing CeO2 was prepared.XRD was used to investigate the existing form of CeO2 powder and the influence of CeO2 addition on the softening temperature of the prepared glass system was determined by DSC.The morphology characteristics of coatings were identified by both the macroscopic observation and SEM with EDS analysis.Thermal shock test and micro-hardness test were performed to compare the coating properties caused by different addition ways of CeO2.The results showed that the addition of CeO2 powder could obviously improve the adhesion ability of coatings and enhance the bonding strength between the coating and substrate.In the case of glass system with CeO2 powder added by melting method,CeO2 still existed as the form of cubic fluorite structure and had no obvious influence on softening temperature.While compared the way of grinding CeO2 into the coating,the way of melting CeO2 into the glass could make CeO2 powder distribute more uniform and get finer CeO2 particles.

关 键 词：CEO2 镍金属-陶瓷复合涂层 显微组织 玻璃相 性能 

分 类 号：TG115.5[金属学及工艺—物理冶金]