Buta Singh Sidhu
IKG Punjab Technical University, India
Title: Characterization of plasma sprayed CNT reinforced alumina coatings on ASME-SA213-T91 boiler tube steel
Biography
Biography: Buta Singh Sidhu
Abstract
Erosion-Corrosion in boiler steels is both costly and dangerous. Many times hot corrosion and erosion are the main causes for shutdown of power plants. Apart from shut down in power plants it limits steam temperature, reduces thermal efficiency of boilers and loss of billions of dollars for the replacement of corroded structures, machinery and equipment.
In this research work, Alumina coatings reinforced with various percentages of carbon nano tubes (CNTs) were prepared and has been successfully deposited on ASME-SA213-T91 boiler tube steel with purpose to enhance the corrosion resistance. Plasma spray process methodology was used to deposit these coatings. Ni-20Cr was used as bond coat before applying CNTs- Al2O3 coatings. The coatings were subjected to metallography, XRD, SEM/EDAX and X-Ray mapping analysis.
A decrease in the porosity has been observed with increase in CNTs content. The carbon nano tubes were found to be uniformly distributed within the Al2O3 matrix. The CNTs were chemically stable during the spray forming. These carbon nano tubes found to be stable even at high processing temperature and have not reacted to form oxides.