Comparing of Wear Resistance of Crystal Glazes

1. Nikoletta Puskás, Dr. László A. Gömze +36-20-5306842, +36-30-7462714 University of Miskolc, Department of Ceramic and Silicate Engineering femniki@uni-miskolc.hu, femgomze@uni-miskolc.hu Comparing of Wear Resistance of Crystal Glazes Introduction Characterization of specimens Process of examinations To get good wear resistance of ceramic products and ceramic coatings is the most important requirement in a lot of cases. To satisfy these requirements sometimes necessary to develop special glazes and coatings not only for technical ceramic items but for building materials like ceramic floor tiles too. Our aims were to increase mechanical properties, hardness and wear resistance of ceramic glazes for ceramic floor tiles. To develop ceramic glazes with the required hardnesss and wear resistance we prepared several types of glazes. • Substrate: 30X30 cm, engobed, bisquit floor tile. • Glazes: 6 kind of glazes, with different mainly in Al2O3 and ZrO2 contain. • Technology: -modelling the industrial production with Disco droops: spray gun • -firing: 1200°C, roller kiln, oxidative atmosphere • Wear resistance examination according to the standard of glazed floor tiles. • Wearing bodies and materials: • steel balls: -w=70g, d=5mm • -w=52,5g, d=3mm • -w=43,75g, d=2mm • -w=8,75g, d=1mm • alumina: w=3g • water: V=20 ml • Results / rating: PEI 1-5 • Analyzes of microstructure by Scanning Electron Microscope Fig.1. Spraying gun Fig.3. Roller kiln Fig.2. Compositions of glazes Results Rates are based on the comparison of the worn and the primary surfaces. Qualification: turns: 100PEI 0 750, 1500PEI 3 150PEI 1 2100, 6000, 12000PEI 4 600PEI 2 >12000PEI 5 Fig.6. Worn glaze coatings Fig.4 Effect of Al2O3 content on wear resistance Fig.5. Effect of ZrO2 content on wear resistance Fig.7. SEM image about high ZrO2 content glaze (M=200X) Fig.8. SEM image about high ZrO2 content glaze (M=2000X) Fig.9. SEM image about high Al2O3 content glaze (M=2000X) Fig.10. Spectrum of the high ZrO2 content glaze (point 1) Fig.11. Spectrum of the high ZrO2 content glaze (point 2) Fig.12. Spectrum of the high Al2O3 content glaze Conclusion • Increasing ZrO2 content cause higher porosity and better wear resistance. • Analysis by Scanning Electron Microscope shows the inhomogenity of glazes. • After analyzing results, we found, that the 2 kind of examined component have different effect on wear resistance. • Increasing Al2O3 content raise wear resistance.