Influence of niobium addition on microstructure, mechanical properties and oxidation resistance of ZrN coatings

被引:19
作者
Wu, Z. T. [1 ]
Qi, Z. B. [2 ]
Jiang, W. F. [1 ]
Wang, Z. C. [1 ]
Liu, B. [3 ]
机构
[1] Xiamen Univ, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China
[2] Xiamen Univ Technol, Sch Mat Sci & Engn, Xiamen 361005, Peoples R China
[3] Xiamen Annaiwy New Mat CO LTD, Xiamen 361005, Peoples R China
基金
中国国家自然科学基金;
关键词
Zr-Nb-N coatings; Microstructure; Hardness; Adhesion; Oxidation resistance; INDUSTRIAL APPLICATIONS; VAPOR-DEPOSITION; PHASE-STABILITY; LOW-TEMPERATURE; FILMS; EVOLUTION; YTTRIA;
D O I
10.1016/j.tsf.2014.05.019
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this study, Zr-Nb-N coatings with 0-3.8 at.% Nb addition were deposited by magnetron co-sputtering deposition. The results reveal that Nb atoms substitute Zr atoms in Zr-N lattice, forming the solid solution structure. All the Zr-Nb-N coatings illustrate a dense columnar structure with the preferred orientation of (200), showing independent of Nb addition. Nanoindentation result reveals a promoted hardness of the Zr-Nb-N coatings from 23.9 +/- 0.7 GPa to 28.4 +/- 0.5 GPa with enhanced Nb content from 0 to 2.8 at.% due to both the solid solution strengthening and Hall-Petch effect. Scratch tests show that adhesion between substrates and coatings can be improved by Nb addition. After oxidation in air at 600 degrees C for 2 h, microstructural studies indicate the oxide scales consist of monoclinic-ZrO2 outer layer and tetragonal-ZrO2 inner layer. Moreover, ZrO2 can be stabilized in the tetragonal phase by Nb doping. The Zr-Nb-N coating with 1.3 at.% Nb addition exhibits superior oxidation resistance, while excess Nb addition produces detrimental effects on oxidation resistance. (C) 2014 Elsevier B. V. All rights reserved.
引用
收藏
页码:256 / 261
页数:6
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