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Technical Properties of Zirconia and Alumina

Characteristics (could vary from raw material suppliers)

	Units	Zirconia	Alumina
Physical Properties
Composition		ZrO2 95%	Al2 O3 99.9%
Density	g.cm3	6.00	3.90

Mechanical Properties
Water absorption	Volume %	0.00	0.00
Bending strength	MPa N.mm-2	1000	320
Compressive strength	Mpa N.mm-2	3000	2000
Young modulus E	GPa	210	360
Rupture modulus K1C	MPa.m 1/2	8	4
Vickers hardness	Kg.mm-2	1200	1700

Thermical Properties
Linear expansion cefficient	10-6. K-1	10.0	8.5
Thermal conductivity	W.m-1. K	3	30
Heat to weight ratio	J.Kg-1, K	450	830
Using temperatur	Deg. C	1000	1500

Electric Properties
Resistivity at 20 deg. C	Ohm.cm	>10/ 9	>10/ 14

Physical Properties