Comparing of Wear Resistance of Crystal GlazesComparing of Wear Resistance of Crystal Glazes

Glaze sign A B C a b c

SiO2 55 52 50 54 52 50

Al2O3 13 17 21 19 17 15

TiO2 0,3 0,2 0,2 0,2 0,2 0,2

Fe2O3 0,3 0,3 0,3 0,3 0,3 0,3

CaO 11 10 9 11 10 9

MgO 2 2 2 2 2 2

K2O 1 1 1 1 1 1

Na2O 4 4 4 4 4 3

ZrO2 7 7 6 0 6 12

ZnO 7 7 7 8 7 7

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

Introduction Characterization of specimens Process of examinations

Conclusion

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=3gwater: V=20 ml

Results / rating: PEI 1-5

•Analyzes of microstructure by Scanning Electron Microscope

Fig.12. Spectrum of the high Al2O3 content glaze

•After analyzing results, we found, that the 2 kind of examined component have different effect on wear resistance.

•Increasing Al2O3 content raise wear resistance.

0

1

2

3

4

5

0 6 12

ZrO2, %

Wea

r re

sist

ance

, PE

I

0

1

2

3

4

5

13 17 21

Al2O3, %

Wea

r re

sist

ance

, PE

I

Results

Fig.1. Spraying gun

Fig.2. Compositions of glazes

Fig.4 Effect of Al2O3 content on wear resistance

Fig.5. Effect of ZrO2 content on wear resistance

Fig.9. SEM image about high Al2O3 content glaze (M=2000X)

Fig.7. SEM image about high ZrO2 content glaze (M=200X)

Fig.8. SEM image about high ZrO2 content glaze (M=2000X)

Fig.10. Spectrum of the high ZrO2 content glaze (point 1)

Fig.6. Worn glaze coatings

•Increasing ZrO2 content cause higher porosity and better wear resistance.

•Analysis by Scanning Electron Microscope shows the inhomogenity of glazes.

Fig.3. Roller kiln

Rates are based on the comparison of the worn and the primary surfaces.

Qualification: turns: 100PEI 0 750, 1500PEI 3

150PEI 1 2100, 6000, 12000PEI 4

600PEI 2 >12000PEI 5

Fig.11. Spectrum of the high ZrO2 content glaze (point 2)