ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The coatings for elevated temperature erosion resistance in circulating fluidized bed (CFB)boilers were fabricated by high velocity arc spraying process and CrB powder wire. Themicrostructure and phase component of the coating were examined by optical microscopy(OM) andTransmission electron microscopy (TEM). The properties including microhardness, adhesionstrength and in-situ erosion rate of the coating were measured. The failure mechanism was alsodiscussed based on the experimental data. The OM results showed that the coating consisted ofindividual flat lamella, thin oxide layer, porosity and very small amount of particle whichcharacterized as different shape and color respectively. TEM results indicated that the phases withinthe lamella were mainly composed of α phase, amorphous phase and other nanosized particle phaseof Fe23(C,B)6, Cr23C6 etc.. The amount of amorphous phase near the substrate was more than that inthe other area indicating that the appearance of amorphous phase was related to the high cooling rateof the coating. The microhardness was about 860~1100HV0.2. The coating exhibited higherosion-corrosion resistance, which was about six times as 20G steel. The advantage of the coatingwith excellent performance, simple process and low cost made it possible to find potential applicationin power plants
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.85.pdf
Permalink