Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第11期    总第176期    2013年11月

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文章编号:1004-0609(2013)11-3171-08
Nb-Cr基涂层的微观结构及初期氧化
李月巧1,李伟洲1, 2, 3,刘会群2,易丹青2,Albano CAVALEIRO3

(1. 广西大学 材料科学与工程学院,南宁 530004;
2. 中南大学 材料科学与工程学院,长沙 410083;
3. SEG-CEMUC-Department of Mechanical Engineering, University of Coimbra,
Rua Luís Reis Santos, P-3030 788 Coimbra, Portugal
)

摘 要: 由磁控溅射技术沉积Nb-Cr、Nb-Cr-Al和Al/Nb-Cr 3种涂层,对涂层的微观结构和初期抗氧化性进行研究。结果表明:Nb-Cr涂层呈柱状结构,含Cr2Nb相;Nb-Cr-Al涂层为含非晶组织的柱状结构;Al/Nb-Cr复合涂层的内层保留了Nb-Cr的柱状结构,外层无明显特征,涂层包含面心立方(FCC) Al、Cr2Nb和NbAl3等相。在1 200 ℃氧化60 min后,3种涂层显示出不同的氧化增质方式及生成了性质各异的氧化产物:Nb-Cr涂层呈抛物线方式增质,表面产物为Cr2O3和CrNbO4多孔混合氧化物;Nb-Cr-Al涂层表现出近线性的氧化增质,表面生成以Cr2O3和CrNbO4为外层、Al2O3为内层的复合氧化物层,氧化膜中有裂纹和脱落,涂层主体呈多孔结构;Al/Nb-Cr复合涂层氧化增质轻微,表面膜以Al2O3为主、连续且致密,涂层中保持高Cr含量,Al/Nb-Cr涂层有较强的抗氧化能力。

 

关键词: Nb-Cr基涂层;微观结构;高温氧化;表面氧化膜

Microstructures and initial oxidation of Nb-Cr based coating systems
LI Yue-qiao1, LI Wei-zhou1, 2, 3, LIU Hui-qun2, YI Dan-qing2, Albano CAVALEIRO3

1. School of Materials Science and Engineering, Guangxi University, Nanning 530004, China;
2. School of Material Science and Engineering, Central South University, Changsha 410083, China;
3. SEG-CEMUC-Department of Mechanical Engineering, University of Coimbra,
Rua Luís Reis Santos, P-3030 788 Coimbra, Portugal

Abstract:Nb-Cr, Nb-Cr-Al and Al/Nb-Cr coatings were deposited by DC reactive magnetron sputtering and the microstructures and initial oxidation resistance of the three coatings were studied. The results show that the as-deposited Nb-Cr coating is composed of Cr2Nb phase and exhibits columnar structure. The Nb-Cr-Al coating is columnar with amorphous phases. The structure of Al/Nb-Cr duplex coatings is a combination of columnar structure in the Nb-Cr and featureless in the Al overlayer. The main phases in the Al/Nb-Cr duplex coatings include FCC Al, Cr2Nb and NbAl3. During thermal exposure at 1 200 ℃ in air for 60 min, the Nb-Cr coating exhibits a parabolic mass gain vs time and the mixture of Cr2O3 and CrNbO4 is formed on the surface. The Nb-Cr-Al coating presents a linear increase in mass gain and the oxidation products are Cr2O3and CrNbO4 on the surface and Al2O3 in the sub-layer. The mass gain is slight and the Cr content remains high in the Al/Nb-Cr coating after exposure. Continuous, dense and mainly Al2O3 scales are formed on the surface. It can be concluded that the Al/Nb-Cr coating possesses strong high temperature oxidation resistance.

 

Key words: Nb-Cr based coating; microstructures; high temperature oxidation; surface scales

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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