Microporosity and delamination mechanisms in thermally sprayed borosilicate glass coatings

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 o 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 as well as deposit coatings of over 1 mm in 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 3 deposited with enhanced properties. The influence of the type of thermal-spray technique on coating quality is also discussed.

Functional Protective Coatings for Steel Architectural Construction Panels

“…cladding steel panels, engaged in a large number of scientific staff. They carry out many studies in the field of formation of glass enamel coatings and the development of new deposition technologies [1,2], synthesize new compositions of glass enamel coatings [3][4][5], and also study their properties [6][7][8].…”

Development of Compositions of New Enamel Coatings with Various Operational and Decorative Properties to Protect Steel Architectural and Construction Panels

“…However, both in Russia and in foreign countries, the problems of enameling steel products, incl. steel panels, a large number of scientists are engaged, including research in the development of new technologies for the application and formation of glass enamel coatings [1,2], in the synthesis of new compositions of glass enamel coatings [3][4][5], as well as research on the properties of glass enamel coatings [6][7][8].…”