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Advanced Ceramics Selection Guide

Material Alumina
96%
Alumina
99.7%
Alumina
99.9%
ZTA
90%Al2O3 / 10% 3Y-TZP
APTZNA
75% TZP / 25% Al2O3
APTZHT
85% TZP / 15% Al2O3
ATZ
80% 3Y-TZP / 20% Al2O3
Zirconia
3Y-TZP
Zirconia
Mg-PSZ
Zirconia
Ce-TZP
Sapphire/ruby Silicon Carbide
sSiC
Silicon nitride
Si3N4-Y2O3
Alumina
99.9%
Zirconia
3Y-TZP
ATZ
80% 3Y-TZP / 20% Al2O3
Polycristalline Ruby
Note Units No aging Shock resistant HIP HIP HIP HIP
General
Density g.cm-3 3.75 3.85 3.95 4.13 5.40 5.70 5.40 6.06 5.74 6.2 3.99 3.1 3.21 3.97 6.07 5.43 3.99
Water adsorption % 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Gas permeability % 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Color - white ivory ivory-white white brown brown white white/black orange light yellow transparent/red black grey translucent white white rubis
Structure - Polycristal Polycristal Polycristal Polycristal Polycristal Polycristal Polycristal Polycristal Polycristal Polycristal Monocristal Polycristal Polycristal Polycristal Polycristal Polycristal Polycristal
Average Grain size µm 4±1 4±2 3±1 3±1 0.5±0.1 0.5±0.1 0.5±0.1 0.5±0.1 20±5 1±0.5 - - - 3±1 0.5±0.1 0.5±0.1 3±1
Mechanical
Bending strength 20°C MPa 300 400 500 600 1000 1000 1000 1200 400 600 200 400 850 550 1700 1600 600
Weibull modulus - 13 14 15 17 15 15 15 10 25 10 12 16 16 18 15
Compression strength MPa 2500 3500 4000 4000 2500 2500 2500 2200 1600 2000 2000 2000 3000 4000 2000 2500 4000
K1c MPa.m1/2 4 4 4 5 6 12 5 8 8 8 4 7 5 9 5 4
Young modulus GPa 350 400 400 380 250 250 250 210 210 200 400 400 300 400 210 250 400
Poisson ratio - 0.23 0.23 0.23 0.25 0.26 0.26 0.26 0.3 0.3 0.25 0.15 0.25 0.23 0.3 0.26 0.23
Hardness Vickers Hv 1500 1700 1900 1800 1300 1200 1400 1200 1200 800 2000 2200 1600 1900 1300 1400 2000
Thermal
Conductivity 20°C W.m-1.k-1 20 25 30 20 10 2.5 3 3.5 100 20 30 2.5 10 30
Conductivity 1000°C W.m-1.k-1
CTE
20-100°C 10-6.k-1
20-400°C 10-6.k-1 7.6 7.5 7.5 8 9 10 10 9 6 3.5 3.2 7.5 10 9 7.5
20-600°C 10-6.k-1
20-1000°C 10-6.k-1 8.8 8.7 8.5 11.7 11 10 5 4.3 8.5 11.7 8.5
Specific heat 20°C kJ.kg-1.k-1 0.9 0.9 0.9 0.9 0.5 0.4 0.4 0.4 0.6 0.7 0.9 0.4 0.5 0.9
Temperature max
oxygen °C 1200 1500 1500 1000 1000 1000 1000 1000 850 500 1500 1400 1300 1500 1000 1000 1000
inert °C 1200 1500 1500 1000 1000 1000 1000 1000 850 500 1500 1800 1600 1500 1000 1000 1000
Electrical
Resistivity 25°C Ω.cm 1.1015 1.1014 5.1014 1014 1.1012 5.1012 1.1013 109 5.107 1.1014 5.1014 1.1012
Resistivity 400°C Ω.cm 1.108 5.108 5.108 109 104 105 106
1.1071 10 5.108 104
Dielectric strength kV.mm-1 17 18 19 19 19 25 0 19 19 19
Dielectric constant - 8 (1MHz) 9 (1MHz) 9 (1MHz) 10 (1MHz) 29 (1MHz) 27 (1MHz) 30 (1MHz) 8 (1MHz) 9 (1MHz) 29 (1MHz)
tan δ - 5.10-3 (9GHz) 5.10-3 (9GHz) 5.10-3 (9GHz) 2.10-3 (1GHz) 2.10-3 (1GHz) 1.10-3 (1MHz) 4.10-3 (1GHz) 5.10-3 (9GHz) 2.10-3 (1GHz)
For further information about technical ceramics :

Technical ceramics

The advantages of advanced ceramics