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APPLICATION OPPORTUNITIES OF DIFFERENT GLAZES TO AL 2 O 3 TECHNICAL CERAMICS

APPLICATION OPPORTUNITIES OF DIFFERENT GLAZES TO AL 2 O 3 TECHNICAL CERAMICS. Nikoletta PUSKÁS Dr. László A. GÖMZE Ildikó LUKÁCS University of Miskolc, Department of Ceramics and Silicate Engineering. microCAD 2005 Miskolc 10-11 March 2005. Introduction.

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APPLICATION OPPORTUNITIES OF DIFFERENT GLAZES TO AL 2 O 3 TECHNICAL CERAMICS

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  1. APPLICATION OPPORTUNITIES OF DIFFERENT GLAZES TO AL2O3 TECHNICAL CERAMICS Nikoletta PUSKÁS Dr. László A. GÖMZE Ildikó LUKÁCS University of Miskolc, Department of Ceramics and Silicate Engineering microCAD 2005 Miskolc 10-11 March 2005

  2. Introduction How develop the smoothness of the technical ceramics? • Experiments and investigations at the Department of Ceramics and Silicates Engineering • Using of porcelain and earthenware glazes microCAD 2005

  3. Materials – Composition • 4 sorts of glazes • 1: earthenware glaze material • 2, 3, 4: porcelain glaze materials microCAD 2005

  4. Materials – Grain structures • 1 • 3 • 2 • 4 • Inhomogenity, grain size 0,5 – 30 m microCAD 2005

  5. Materials – Technology • Densities of glaze suspensions: • 1: 1450 g/l • 2: 1250 g/l • 3: 1350 g/l • 4: 1275 g/l • Firing temperature: 1270 °C • Dipping microCAD 2005

  6. Unusable results • Glazes marked 2, 3 and 4 did not develop perfect coatings • Glaze skips • Pinholes microCAD 2005 • Too thin coating

  7. Further examinations • Further examinations, using glaze material marked 1 in different densities: • 1350 g/l • 1450 g/l • 1500 g/l • Different dry material content alumina substrates made by casting: • Porous • Medium • Compact microCAD 2005

  8. Testing methods – Microhardness measurement • Applied loading force: 2N • Time of loading: 10 sec • Medium compact bodies with different density of glazes • Different compact base ceramics with 1350 g/l density glaze microCAD 2005

  9. Testing methods – Scratch test • Table speed: 10 mm/min • Loading gradient: 10 N/mm • Starting load: 10 N • Final load: 100 N microCAD 2005

  10. Results – Microhardness microCAD 2005

  11. Results – Scratch test microCAD 2005

  12. Results – Scratch test microCAD 2005

  13. Results – Roughness microCAD 2005

  14. Conclusions • Nowadays glazing of technical ceramics exposed to heavy duty use is a current and important challenge. • The quality of the ceramic glazes strongly depends on the density of the glaze liquids and the geometrical shapes and sizes of solid ceramic particles in the glaze slurries. • Using the ceramic glazes we can considerably reduce the roughness of the surfaces of the alumina technical ceramics, increasing with this the estimated life cycles of these valuable technical items. • The scratch tests are necessary to reach the required hardness of the ceramic glazes and adhesive strength between the glazes and the alumina substrates. microCAD 2005

  15. Acknowledgement • Department of Physical Metallurgy and Metallforming • Department of Mechanical Technology microCAD 2005

  16. Many thanks for your attention!

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