Effect of nano yttria-stabilized zirconia on properties of Ni-20Cr composite coatings

Journal of Electrochemical Science and Engineering

article

Sukhjinder Singh¹  Khushdeep Goyal¹  Rakesh Bhatia² 

[1] Department of Mechanical Engineering, Punjabi University;Yadavindra Department of Engineering, Punjabi University Guru Kashi Campus

关键词: Thermal spray coatings;    nanocomposites;    porosity;    hardness;    microstructure;    oxy-fuel;    HVOF;   

DOI  :  10.5599/jese.1319

学科分类：内科医学

来源: International Association of Physical Chemists (IAPC)

【 摘 要 】

In the present work, 5 and 10 wt.% yttria-stabilized zirconia (YSZ) nanoparticles were reinforced in Ni-20Cr powder and deposited on boiler tube steel using a high-velocity oxy-fuel spraying process. The effect of YSZ reinforcement on microhardness, surface roughness and porosity were investi­ga­ted. The hardness was the highest for nanocomposite coating reinforced with 10 wt.% YSZ and hard­ness was found to increase with a decrease in porosity. The coating microstructure and elements were characterized using field emission scanning electron microscopy (FE-SEM) with an energy dispersive spectroscope (EDS). The constituents of the coating were identified using X-ray diffracto­meter. It was found that the composite coating with 10 wt.% YSZ reinforced nanocomposite coating has the highest microhardness, in the range of 1008-1055 hv. During the coating process, nano YSZ particles were dispersed in the gaps between the micrometric Ni-20Cr particles, providing a better coating matrix than conventional Ni-20Cr. The Ni-20Cr with 10 wt.% of YSZ nanoparticles showed better results in terms of mechanical and microstructural properties during the investigation.

【 授权许可】

CC BY