Zirconia Ceramics

Zirconia materials are used in very high wear applications under very high pressure requiring improved fracture toughness and stiffness over alumina. Zirconia is noted for its high strength, toughness, wear and thermal properties. Its high material cost usually warrants its usage extending longer life and reduce down time where alumina fails in this applications.

During manufacture, the zirconia powder is combined with oxides such as Yttria, magnesia or tetragonal and the material is said to be partially stabilised or even it can be fully stabilised if required, varying the composition allows different properties to be enhanced.

Yttria (Y-PSZ) stabilised zirconia are mainly used for excellent wear resistance up to 400’C temperature while Magnesia (MgO-PSZ) zirconia are very good at high temperature offering excellent thermal shock and also wear resistance. Y-TZP Zirconia material has tetragonal in structure and has the highest flexural strength of all the zirconia based materials. The fine grain size of Y-TZP lends itself to be used in cutting tools where a very sharp edge can be achieved and maintained due to its high wear resistance. The fine grade size leads to a fully dense with excellent mechanical strength, corrosion resistance, impact toughness, thermal shock resistance and very low thermal conductivity.

Advantages of Zirconia Ceramics

  • High strength
  • High toughness
  • Excellent wear resistance
  • High hardness
  • Low thermal conductivity
  • Good chemical and corrosion resistanc

Applications of Zirconia Ceramics

  • Various wear parts for wear applications
  • Valves and pump components
  • Ceramic plain, balls and roller bearings
  • Tubes, fixtures etc. for High temperature
  • Copper tube extruding & reducer dies
  • Thermal insulation components
  • Wear resistance and Cutting blades
  • Ceramic knives
  • Grinding media

Properties of Ziroconia Materials

Magnesia ZrO2+MgO Yttria ZrO2+Y2O3 Tetragonal ZrO2+ YTZP Toughened ZrO2+Al2O3
Density- g/cm3 5.70 6.02 6.04 5.5
Water Absorption-% 0.00 0.00 0.00 0.0
Compressive strength-Mpa 1700 2000 4000 2000
Flexural Strength – Mpa 600 950 2500 1800
Fracture Toughness- Mpa.m1/2 8-9 c 10 8
Young Modulus-Gpa 250 205 210 220
Max. Temperature °C 1000 1000 1000 1000
Thermal Conductivity-W/m’K 2.5 2.0 2.0 6.0
Thermal Expansion of Coefficient linear -10-6/°C 10.0 10.0 11.0 9.0
Volume resistance – Ohm cm 1010 1010 107 n/a
Dielectric Constant 1MHz 28 8.3 2.4 n/a
Dielectric Strength – kV/mm 9.0 9.0 8.7 n/a
All properties are at room temperature unless otherwise noted. Engineering data are representative, and are not intended as absolute nor warrantable and therefore it is for guidance only.

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