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Oxide Ceramics (ZrO2 (Fig 11) (Polymorphic Forms (Monoclinic, Tetragonal,…
Oxide Ceramics
ZrO2 (Fig 11)
Hardness
Low Thermal Conductivity
High MP
Chemical Inertness
Wear Resistance
Polymorphic Forms
Monoclinic
Tetragonal
Cubic
Liquid
Stabilisation
By Alloy Oxides
MgO
CaO
CeO2
Fracture Toughness
~ Flaw Tolerance
Al2O3
Polycrystalline Form
Applications
Refractories
Abrasives
Processing
Bauxite: Bayer Chemical Process => Metallic Aluminium: Electrolysis in Alumina Refinery
Properties
Electrical Insulator
High Thermal Conductivity
High Hardness
High Wear Resistance
High Strength
Good Thermal Stability
Problems
Slow Crack Growth
Delayed Failure
Thermal Shock & Strength