| Erosion Response of High-Velocity Oxy-Fuel Sprayed
Marble Dust-NiCr Coatings |
Sandip Kumar Nayak,1,* Alok Satapathy,1 Sisir Mantry2 and Laxmidhar Besra2
Pages : 149-157
DOI : 10.1080/0371750X.2022.2149626 |
| Abstract |
| In the present research, raw marble dust (an ornamental stone waste) with and without
pre-mixing of nickel chrome (NiCr) powder are used as the feedstock material to deposit
overlay coatings on the mild steel substrates through HVOF spraying technique. The
physical as well as mechanical characterizations of the deposited coatings in terms
of deposition efficiency, adhesion strength, coating thickness and micro-hardness
are done at controlled laboratory conditions. To get an insight to the erosion behavior
of the deposited coatings, high temperature solid particle erosion trials on them are
carried out as per ASTM G76 considering the test parameter combinations obtained
from Taguchi’s L16 orthogonal array. On analyzing the experimental outcomes, impact
velocity, NiCr content in the feedstock, erodent temperature and impingement angle
are found to be sequentially significant in terms of affecting the wear loss of the
coatings. Based on the findings from the analysis, further experimentations are
conducted at different levels of the significant control factors to ascertain their effects
on the wear rate more precisely. The micrographs of the worn surfaces taken using a
scanning electron microscope are studied to identify the possible damage mechanisms
causing the erosion loss.
[Keywords: HVOF spray coating, Ornamental stone waste, Marble dust, Nickel chrome,
Solid particle erosion, Wear mechanism] |
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