Microporosity and delamination mechanisms in thermally sprayed borosilicate glass coatings
Journal article
Gao, J, Bao, Y and Gawne, DT (2016). Microporosity and delamination mechanisms in thermally sprayed borosilicate glass coatings. Surface & Coatings Technology. 304 (25 Oct), pp. 195 - 202. https://doi.org/10.1016/j.surfcoat.2016.07.008
Authors | Gao, J, Bao, Y and Gawne, DT |
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Abstract | Conventional enamelling requires both the feedstock powder and the substrate component to be heated one or more times in a furnace at 800–900 °C. The process can degrade the substrate and limit the size of the component to the furnace dimensions, which are serious restrictions on the technology. This study concerns the use of combustion- flame spraying as an alternative technique for enamelling. In this process, the heat source (the flame) is separated from the substrate, which enables much lower substrate temperatures and avoids thermal damage. It also removes the need for furnace treatment and opens up the possibility of on-site enamelling and repair. However, experimental trials showed that thick flame-spray coatings delaminated during cooling and had high microporosities due to quenching stresses at the glass-steel interface and inadequate splat flow of small feedstock particles. The research shows that these adverse mechanisms could be overcome by pre-heating the substrate surface to the dilatometric softening temperature and removing fines from the feedstock powder. The control of these two parameters was found to double the adhesion strength, provide coatings of very similar hardness and fracture toughness to conventional enamel aswell as deposit coatings of over 1mmin thickness for heavy-duty corrosion protection. Thermal spraying is well established for ceramic and metal coatings but the fundamentally different structure of glasses requires a different approach. An advantage of combustion flame spraying shown up by this research is that the high energy of the flame accelerates the particles to a high velocity and the resulting impact forces promote the flow of the glass. As a result, lower substrate temperatures may be used with reduced risk of degradation or higher viscosity glasses may be deposited with enhanced properties. The influence of the type of thermal-spray technique on coating quality is also discussed |
Year | 2016 |
Journal | Surface & Coatings Technology |
Journal citation | 304 (25 Oct), pp. 195 - 202 |
Publisher | Elsevier |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.surfcoat.2016.07.008 |
Publication dates | |
04 Jul 2016 | |
Publication process dates | |
Deposited | 07 Sep 2016 |
Accepted | 02 Jul 2016 |
Accepted author manuscript | License File Access Level Open |
https://openresearch.lsbu.ac.uk/item/8735v
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Accepted author manuscript
Microporosity and delamination mechanisms in thermally sprayed borosilicate glass.pdf | ||
License: CC BY-NC-ND 4.0 | ||
File access level: Open |
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