Wear Resistance of Metal Oxide Sol-Gel Coatings Deposited over Ceramic Glazes

Abstract

This paper analyse the wear resistance of high reflective metal oxide films of TiO2 (anatase), Fe2O3 (hematite), ZrO2 (Zirconia) and SnO2 (Casiterite) deposited by screen printing over a conventional ceramic glaze (molar composition 0,2CaO.0,15ZnO.0,05K2O.0,1Al2O3 0,45SiO2.0,05ZrO2). All oxide coatings increase the gloss of the substrate producing a lustre effect. Anatase films stand out for their high gloss valour and low roughness Ra. Likewise, all lustres improve the wear resistance of the glaze substrate. Hematite and casiterite coatings stand out for their relatively high wear resistance maintaining relatively high reflectivity.

Studies on surface characteristics and chemical resistance of zirconia nano coating developed on glazed ceramic wall tiles

“…1) [IS] of the coating compared to that of the glaze (1.54-1.56) [2] as it is also reported elsewhere [2,11] that reflectivity (gloss) of glass/glaze surfaces can be increased simply by covering its surface with a single layer of metal oxide having a higher refractive index than that of glass.…”

“…Hence, the films are widely used in optical coatings with high gloss [2], heat resistant materials [3], optical filters [4], sensors [5], fuel cells [6] and so on. It is reported that hydrophobic and anti-wear properties on table ware can be developed by application of zirconia coatings [7] by sol-gel method and the same coating was developed by inductively coupled oxygen plasma sputtering [8] on ceramic surfaces such as china and porcelain and reported the development of contact angle of water as 90' in [7].…”

Effect of Curing Temperature on Surface Characteristics of TiO2-Fe2O3Multi Oxide Thin Film Deposited over Glazed Ceramic Wall Tiles

“…Further, high gloss of the coated substrate can be attributed to the high refractive index (RI) of TiO 2 and Fe 2 O 3 23 in comparison to the normal zircon opacified glaze (1.54) as it is reported that reflectivity of glaze can be increased by applying a layer of oxide having high RI than that of glaze. 6,24,25 The increase in gloss of coated tile enhances its aesthetic appeal and thus could result in high demand in the market. Images of paper weight on uncoated and coated substrates cured at 700 o C are shown in Figs.…”

“…1 Recently, a lot of investigations have been carried out on glazed ceramic tiles to improve its surface functional properties such as soiling, cleanability, wear resistance, gloss and antibacterial property in addition to the above mentioned properties by applying additional coating on the glazed surfaces. [2][3][4][5][6] Coating with a specific or multiple functional properties is applied on glazed surfaces according to the need as these tiles are exposed to different types of environment. In hospitals and bathrooms, antibacterial property is required prior to other properties.…”

“…A lot of investigations have been carried out to study the effect of inorganic oxide based sol-gel coatings on glazed ceramic tiles with respect to functional surface characteristics. 2-6, 12, 13 Investigations on sol-gel based metal oxide films such as TiO 2 , Fe 2 O 3 , ZrO 2 and SnO 2 have been done by researchers 6 and it has been reported that these coatings improved not only reflectivity but also wear resistance. In the present study, sol-gel based TiO 2 -Fe 2 O 3 coating has been developed on glazed ceramic wall tiles and the effect of curing temperature on various surface characteristics of glazed ceramic surfaces such as microstructure, gloss, aesthetics, stain resistance, hardness, etc are reported.…”