In Situ Synthesis of FeAl Dense Coatings by Very Low Pressure Reactive Plasma Spraying
- PDF / 997,552 Bytes
- 6 Pages / 593.972 x 792 pts Page_size
- 73 Downloads / 192 Views
JTTEE5 22:90–95 DOI: 10.1007/s11666-012-9851-1 1059-9630/$19.00 Ó ASM International
In Situ Synthesis of FeAl Dense Coatings by Very Low Pressure Reactive Plasma Spraying Lin Zhu, Nannan Zhang, Baicheng Zhang, Rodolphe Bolot, Hanlin Liao, and Christian Coddet (Submitted May 9, 2012; in revised form October 11, 2012) With the purpose of elaborating high-quality FeAl coatings, a so-called very low pressure reactive plasma spray technique that combines very low pressure plasma spray and self-propagation high-temperature synthesis processes was used in the present study. A dense and homogeneous FeAl coating was thus successfully in situ synthesized by reactive plasma spraying of an Al/Fe2O3 composite powder under 1 mbar. The phase composition and microstructural features of the coating were characterized by XRD and SEM. Results indicated that the B2 ordered FeAl phase was synthesized, and the coating featured a dense and defect-free microstructure. The fracture mechanism of the coating remains mainly a brittle failure but the appearance of some dimples in local zones suggested some unexpected toughness.
Keywords
FeAl coating, reaction, very low pressure plasma spray
1. Introduction Recently, very low pressure plasma spray (VLPPS) technology emerged as a new generation of thermal spray process (Ref 1-3), which allows depositing coatings with uniform, dense, and PVD-like microstructure. Moreover, a working atmosphere of inert gas under controlled low pressure avoids the oxidation and contamination of coating products (Ref 4).
This article is an invited paper selected from presentations at the 2012 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2012: Proceedings of the International Thermal Spray Conference, Air, Land, Water, and the Human Body: Thermal Spray Science and Applications, Houston, Texas, USA, May 21-24, 2012, Basil R. Marple, Arvind Agarwal, Laura Filofteia-Toma, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Andre´ McDonald, Ed., ASM International, Materials Park, OH, 2012. Lin Zhu, Laboratoire dÕEtudes et de Recherches sur les Mate´riaux, les Proce´de´s et les Surfaces, Universite´ de Technologie de BelfortMontbe´liard, Site de Se´venans, 90010 Belfort Cedex, France; and Materials Research Institute for Energy Equipments, China First Heavy Industries, Tianjin 300457, China; Baicheng Zhang, Rodolphe Bolot, Hanlin Liao and Christian Coddet, Laboratoire dÕEtudes et de Recherches sur les Mate´riaux, les Proce´de´s et les Surfaces, Universite´ de Technologie de Belfort-Montbe´liard, Site de Se´venans, 90010 Belfort Cedex, France; and Nannan Zhang, Department of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China. Contact e-mail: [email protected].
90—Volume 22(2-3) March 2013
FeAl intermetallic alloy is a desirable candidate for the intermediate or high temperature applications due to its low density, low cost, high oxidation resistance and good mechanica
Data Loading...
