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Development of Ceramic Materials with Extreme Mechanical Properties Dr. László A. Gömze H-3515 Miskolc-Egyetemváros, Hungary Tel. +36-30-7462714 EUROMAT.

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Presentation on theme: "Development of Ceramic Materials with Extreme Mechanical Properties Dr. László A. Gömze H-3515 Miskolc-Egyetemváros, Hungary Tel. +36-30-7462714 EUROMAT."— Presentation transcript:

1 Development of Ceramic Materials with Extreme Mechanical Properties Dr. László A. Gömze H-3515 Miskolc-Egyetemváros, Hungary Tel EUROMAT 2005 Conference PRAGUE

2 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc ABSTRACT  Mechanical properties of ceramics  Factures influence on mechanical properties of ceramics  Microstructure and Morphology of technical ceramics  Distribution of pressure stresses in ceramic powders during their compacting  Ceramic items with extreme mechanical properties

3 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE MECHANICAL PROPERTIES OF CERAMICS  STRENGTH  Pressure strength (Rp)  Shearing strength (Rs)  Bending strengt (Rb)  Tensile strength (Rh)  HARDNESS  Micro-hardness (HVmi)  Macro-hardness (HVma)  RHEOLOGICAL PROPERTIES (  i, E i,  0,  ) Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc

4 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE FACTURES, INFLUENCE ON MECHANICAL PROPERTIES OF TECHNICAL CERAMICS  Chemical composition (C c )  Shapes (S g ) and grain sizes (G s ) of used ceramic powders  Distribution of grain shapes and sizes in forming dies (D g )  Distribution of pressure stresses in ceramic bidies during their compacting (D p )  Temperature (T s ) and atmosphere (S a ) of sintering

5 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE PRESSURE STRENGTH AND MICRO HARDNESS AS FUNCTION OF INFLUENCE FACTURES Rp = f(C c, D g, D p, G s, S a, S g, T s ); HVmi = f(C c, D g, D p, G s, S a, S g, T s )

6 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE THE TIPICAL SHAPES AND DISTRIBUTION OF ATOMIZER POWDERS IN FORMING DIES

7 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE INFLUENCE OF POWDER GRAIN SIZES AND THEIR DISTRIBUTION ON MICROSTRUCTURE AND MORPHOLOGY OF FIRED CERAMIC ITEMS

8 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE DISTRIBUTION OF PRESSURE STRESSES IN CERAMIC POWDERS DURING THEIR COMPACTING WITH UNIAXIAL TECHNOLOGY [MPa]

9 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE PRESSURE DISTRIBUTION IN FORMING DIES WITH TRUNCATED CONE SHAPES [MPa]

10 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE PRESSURE DISTRIBUTION IN FORMING DIES WITH RECTANGULAR PRISMATIC SHAPES [MPa]

11 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE PRESSURE DISTRIBUTION IN FORMING DIES WITH REGULAR HEXAGONAL PRISMATIC SHAPES [MPa]

12 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE PRESSURE DISTRIBUTION IN FORMING DIES WITH TRUNCATED PYRAMID SHAPES [MPa]

13 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE PRESSURE DISTRIBUTION IN FORMING DIES WITH SPHERICAL SEGMENT OF SHAPES [MPa]

14 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE PRESSURE DISTRIBUTION IN FORMING DIES WITH QUARTERED TORUS SHAPES [MPa]

15 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE THE REQUIRED „MINIMUM” VALUE OF DEVELOPED PRESSURE STRESS IN CERAMIC BODIES DURING THEIR FORMING IN DIES WITH CYLINDRICAL SHAPES [MPa]

16 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE THE REQUIRED „MINIMUM” VALUE OF DEVELOPED PRESSURE STRESS IN CERAMIC BODIES DURING THEIR FORMING IN DIES WITH TRUNCATED CONE SHAPES [MPa]

17 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE THE REQUIRED „MINIMUM” VALUE OF DEVELOPED PRESSURE STRESS IN CERAMIC BODIES DURING THEIR FORMING IN DIES WITH SPHERICAL SEGMENTS OF SHAPES [MPa]

18 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE THE SYMBOLS USED IN MATHEMATICAL EQUATIONS a, A, b, B, r, r0, R, R0, d, D, , ,  and  - are geometrical parameters f, fb –friction ratios p – the outside pressure, developed by pressing punchers L – distance from the contact surface of pressing punchers to the examined place in ceramic powders

19 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE INFLUENCE OF THE PRESSURE STRESSES ON THE MICROSTRUCTURE AND MORPHOLOGY OF FIRED ALUMINA CERAMIC ITEMS UNDER PRESSED POWDERSWELL PRESSED POWDERS

20 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE OPTIMUM PRESSED POWDERS INFLUENCE OF THE PRESSURE STRESSES ON THE MICROSTRUCTURE AND MORPHOLOGY OF FIRED ALUMINA CERAMIC ITEMS WELL PRESSED POWDERS WITH OPTIMUM GRAIN SIZE DISTRIBUTION IN FORMING DIE

21 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE CONCLUSION 1. THE FAILURES AND MISTAKES MADE DURING COMPACTING OF CERAMIC ITEMS CAN NOT BE CORRECTED WITH SINTERING AND OTHER TECHNOLOGICAL OPERATIONS 2. THE VALUES AND DISTRIBUTION OF PRESSURE STRESSES ARE THE MAIN FACTURES WHICH INFLUENCE ON PRESSURE STRENGTHES OF TECHNICAL CERAMIC ITEMS MADE FROM AL2O3 POWDERS 3. WE ARE THE FIRST WHO COULD DESCRIBE THE MATEMATICAL EQUATIONS OF PRESSURE DISTRIBUTION IN CERAMIC BODIES DURING THEIR COMPACTING IN DIES OF DIFFERENT GEOMETRICAL SHAPES

22 Dr. GÖMZE A. László, Department of Ceramics and Silicate Engineering, University of Miskolc EUROMAT 2005 Conference PRAGUE THANK YOU FOR YOUR ATTENTION


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