EFFECT OFLa2O3ON HIGH-TEMPERATURE OXIDATION RESISTANCE OF ELECTROSPARK DEPOSITEDNi-BASED COATINGS

Yuxin Gao (), Jian Yi, Zhigang Fang and Hu Cheng
Additional contact information
Yuxin Gao: School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China
Jian Yi: School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China
Zhigang Fang: School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China
Hu Cheng: School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China

Surface Review and Letters (SRL), 2014, vol. 21, issue 05, 1-8

Abstract: The oxidation tests of electrospark depositedNi-based coatings without and with 2.5 wt.%La2O3were conducted at 960°C in air for 100 h. The oxidation kinetic of the coatings was studied by testing the weight gain. The phase structures and morphologies of the oxidized coatings were investigated by XRD and SEM. The experimental results show that the coatings with 2.5 wt.%La2O3exhibits excellent high-temperature oxidation resistance including low oxidation rate and improved spallation resistance, due to the formation of a denser and more adherent oxide scale compared with that withoutLa2O3. The effects ofLa2O3on the oxidation resistance include the following two aspects: First, refinement of the coating grains promotes the selective oxidation ofCr, leading to the formation of protective chromia scale in a short time, and second, refinement of the oxide grains enhances the high-temperature creep rate, resulting in decrease of inner stress and improvement of spallation resistance of the oxide layer.

Keywords: High-temperature oxidation; La2O3; Ni-based coatings (search for similar items in EconPapers)
Date: 2014
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X14500711
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:21:y:2014:i:05:n:s0218625x14500711

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X14500711

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().