Original scientific paper
https://doi.org/10.5599/jese.1228
Microstructural and mechanical properties of CNT-reinforced ZrO2-Y2O3 coated boiler tube steel T-91
Sandeep Kumar
; Department of Mechanical Engineering, Guru Kashi University, Bathinda, Punjab, India
Rakesh Bhatia
; Yadavindra Department of Engineering, Punjabi University Guru Kashi Campus, Damdama Sahib, India
Hazoor Singh
; Yadavindra Department of Engineering, Punjabi University Guru Kashi Campus, Damdama Sahib, India
Roshan Lal Virdi
; Department of Mechanical Engineering, Punjabi University, Patiala, India
Abstract
The main purpose of this study was to fabricate carbon nanotubes (CNTs) reinforced zirconnium yttrium coatings on boiler tube steel and to investigate the microstructural and mechanical properties of these coatings. Plasma sprayed conventional ZrO2-Y2O3, ZrO2-Y2O3 and 1 wt.% CNT and ZrO2-Y2O3 and 4 wt.% CNT were prepared and deposited successfully on boiler tube steel material T-91 (ASTM SA-213) by plasma thermal spray technology. Microhardness, porosity, XRD (X-ray diffraction), SEM/EDAX (scanning electron microscopy/energy dispersive X-ray spectroscopy), X-ray mapping and cross-sectional analyses were used to analyse the specimens. The hardness of CNT reinforced ZrO2-Y2O3 increased with the increase in the percentage of CNT, whereas the porosity of the composite coatings decreased with the increase in the CNT percentage. The observed increase in hardness may be attributed to the content of CNT in the composite coating. The present research gives important information related to the fabrication and physical characteristics of CNT-reinforced ZrO2-Y2O3 coatings deposited on T-91 boiler tube steel.
Keywords
Carbon nano tubes (CNT’s); plasma spray; porosity; hardness
Hrčak ID:
284435
URI
Publication date:
14.10.2022.
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