ADVANCED CERAMICS SELECTION GUIDE

	Material	Alumina 96%	Alumina 99.7%	Alumina 99.9%	ZTA 90%Al2O3 / 10% 3Y-TZP	Ce-Y stabilised Zirconia 85% TZP / 15% Al2O3	ATZ 80% 3Y-TZP / 20% Al2O3	Zirconia 3Y-TZP	Zirconia1.5Y-TZP	Zirconia Mg-PSZ	Zirconia Ce-TZP	Sapphire/ruby	Silicon Carbide sSiC	Silicon nitride Si3N4-Y2O3	SiAlON	Aluminum NitrideAlN	Alumina 99.9%	Zirconia 3Y-TZP	ATZ 80% 3Y-TZP / 20% Al2O3	Polycristalline Ruby
Note	Units					Shock resistant											HIP	HIP	HIP	HIP
General
Density	g.cm-3	3.75	3.85	3.95	4.13	5.70	5.40	6.06	6.10	5.74	6.2	3.99	3.1	3.21	3.24	3.20	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	0	0
Gas permeability	%	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Color	-	white	ivory	ivory-white	white	brown	white	white/black	white	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	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	0.2±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	1200	1100	400	600	200	400	850	750	350	550	1700	1600	600
Weibull modulus	-	13	14	15	17	15	15	10	15	25	10		12	16	10		16	18	15
Compression strength	MPa	2500	3500	4000	4000	2500	2500	2200	2000	1600	2000	2000	2000	3000			4000	2000	2500	4000
K1c	MPa.m1/2	4	4	4	5	12	5	8	15	8	8		4	7	5.5	3	5	9	5	4
Young modulus	GPa	350	400	400	380	250	250	210	210	210	200	400	400	300	350	300	400	210	250	400
Poisson ratio	-	0.23	0.23	0.23	0.25	0.26	0.26	0.3	0.3	0.3	0.25		0.15	0.25		0.25	0.23	0.3	0.26	0.23
Hardness Vickers	Hv	1500	1700	1900	1800	1200	1400	1200	1200	1200	800	2000	2200	1600	1800		1900	1300	1400	2000
Thermal
Conductivity 20°C	W.m-1.k-1	20	25	30	20		10	2.5	2.5	3	3.5		100	20	20	170	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	10	9	6	3.5	3.2	3.3	5	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	11.7	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		0.4	0.6	0.7	0.7	0.8	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	1000	800	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	1.1012	5.1012	1.1013	109	5.107	1.1014		1.1012	5.1014	1.1012
Resistivity 400°C	Ω.cm	1.108	5.108	5.108	109			104	104	105	106		1.1071	1.1010			5.108	104
Dielectric strength	kV.mm-1	17	18	19				19	19	19	25		0	19		30	19	19
Dielectric constant	-	8 (1MHz)	9 (1MHz)	9 (1MHz)	10 (1MHz)			29 (1MHz)	29 (1MHz)	27 (1MHz)	30 (1MHz)			8 (1MHz)	9 (1MHz)	9 (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)	2.10-3 (1GHz)	1.10-3 (1MHz)			4.10-3 (1GHz)	1.10-3 (1MHz)	5.10-3 (9GHz)	5.10-3 (9GHz)	2.10-3 (1GHz)

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