Home      Exposition      To Register      ASM Homepage
Back to "Session 4: Cold Spray 4: Coating Development" Search
  Back to "Cold Spray" Search  Back to Main Search

Monday, May 15, 2006 - 4:40 PM
CSP5.4

Formation of Fe-Al Intermetallic Compound Coating through Cold Spraying

C. J. Li, H. T. Wang, G. J. Yang, C. X. Li, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China

Intermetallic materials have excellent high temperature oxidation resistance and erosion and cavitation resistances. It is the promising coating materials with many potential industrial applications. In this study, formation of Fe-Al intermetallic compound based coating was performed through using cold spraying assisted by post annealing treatment. Fe-Al alloy composite powder containing 20wt% WC-Co was produced by ball milling process. Nano-structured Fe-Al alloy coating was deposited through cold spraying. The coating was annealed at different temperatures. The microstructure of the coating was characterized by scanning electron microscopy, transmission electron microscopy, x-ray diffraction analysis. The effect of annealing temperature on the coating microstructure evolution was examined. It was found that the microstructure of the as-sprayed coating depends significantly on the microstructure of powder. Fe-Al intermetallic phase was evolved during annealing at a temperature higher than 500oC. Moreover, grain growth occurred with the increase of annealing temperature. The results showed that microhardness of the as-sprayed coating reached to over 600Hv. The effect of annealing treatment and coating microstructure on coating hardness was examined.

Summary: Fe-Al intermetallic compound based coating was performed through cold spraying assisted by post annealing treatment. The effect of powder microstructure and annealing temperature on the coating microstructure evolution was examined. The effect of annealing treatment and coating microstructure on coating hardness was investigated.