4.7 Article

Erosion behavior of arc sprayed FeTi/CrB MMC coating at elevated temperature

Journal

SURFACE & COATINGS TECHNOLOGY
Volume 262, Issue -, Pages 141-147

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.12.027

Keywords

MMC coating; Cored wire; Arc spraying; Circulating fluidized bed boiler; High temperature erosion

Funding

  1. National Scientific and Technological Project [2013AA09A222]

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A self-developed FeTi/CrB composite cored wire and the commercially available stainless amorphous metal (SH-SAM) cored wire were used to form the composite coatings by arc spraying on 20 g steel substrates. The coating composition and microstructure were characterized by energy dispersive X-ray spectra, X-ray diffraction and scanning electron microscope. The high temperature erosion properties of FeTi/CrB and SH-SAM coatings were determined at different impact angles and environmental temperatures. The results show that the matrix phase of FeTi/CrB coating consists of FeCr solid solution, with a certain amount of oxide inclusions and boride hard phase, forming a metal matrix composites (MMC) coating reinforced by ceramic particles. Compared with the SH-SAM coating, the FeTi/CrB coating has lower porosity and higher bond strength. The high temperature erosion rate of FeTi/CrB coating is much lower than that of SH-SAM coating at all experimental conditions. The FeTi/CrB coating exhibits good toughness and high spalling resistance attributed to the hard phase at elevated temperature. By contrast, the SH-SAM coating presents more brittle characteristics. The FeTi/CrB MMC coating presents itself as a potential protective coating for circulating fluidized bed boiler. (C) 2014 Elsevier B.V. All rights reserved.

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