Development of Fly Ash Containing Catalytic Vitreous Enamel Coatings

Abstract

Fly ashes are the by products from coal based raw materials of thermal power plants that are gathered with electro filters or cyclones.Due to the utilization possibility of fly ash particles varying applications Fly Ash is considered as a byproduct of thermal power plants.İnvestigation on possible use of fly ash in enamel production are reported. New enamel frits compositions were developed in order toutilize the fly ash in most efficient in their glass – ceramic matrix. Catalytic enamel frits were selected to be studied due to their highmetallic oxide amounts compared to other enamel frits. Fly ash particles are added to the developed catalytic enamel frit in 1 wt.%, 5wt.% and 10 wt.% in order to investigate the possible alternative usage of fly ash by products. Catalytic activity of the prepared enamelstested with ISO 8291 Test Standard and also, the surface roughness and gloss values are determined. Gloss values were increasedcompared to the standart enamel compositions in a tolerable amount. 1 wt.%, 5 wt.% and 10 wt.% fly ash addition, the gloss valueswas increased up tp 3.3, 10 and 36.6 %, respectively. Surface roughness of the standard enamel coating was 96 µm and with 1 wt.%, 5wt.% and 10 wt.% fly ash addition the roughness values increase 14.5, 28.1 and 33.3 %. The results showed that addition of fly ash intothe catalytic enamel frit did not change the ISO 8291 Test results which are 8 cycles for all the samples. Fly ash particles did not distortthe catalytic enamel layer and did not impair the catalytic properties.