Advanced Ceramics – Materials Properties for Impervious and Porous Haldenwanger Ceramics

Sponsored by Morgan Advanced Materials - Technical CeramicsFeb 9 2007

Properties of Impervious Materials without Zirconia Y-TZP

Table 1 provided below gives the properties of impervious materials without zirconia Y-TZP.

Table 1. Properties of impervious materials without Zirconia Y-TZP

Material	Units	Alsint 99.7	Pythagoras 1800Z	Pythagoras	Zirconia MgO-PSZ	Zirconia CaO-FSZ	Halsic-I	Halsic-S
Al₂O₃ content	%	99.7	76	60	-	-	-	-
Alkali content	%	-	0.5	3	-	-	-	-
SiC content	%	-	-	-	-	-	88-92	99
Si-free	%	-	-	-	-	-	8-12	0.1
Type according to DIN EN 60672	-	C 799	C 620	C 610	-	-	-	-
Water absorption capacity	%	≤0.2	≤0.2	≤0.2	≤0.2	≤0.2	≤0.1	≤0.1
Leakage rate at 20°C	hPa dm³s^-1	10^-10	-	10^-10	-	-	-	-
Bulk density	g.cm^-3	3.75-3.94	3	2.6	5.6	5.4	3.1	3.1
Flexural strength 20°C (3-point)	MPa	300	150	120	500	200	240-280	350-400
Flexural strength 1300°C (3-point)	MPa	-	-	-	-	-	250-300	370-420
Young’s modulus	GPa	300-380	150	100	-	-	370	420
Hardness (Mohs scale)	-	9	8	8	-	-	-	-
Thermal expansion 20-700°C	10^-6 K^-1	7.8	5.6	5.4	9.8	9.9	3.7	-
Thermal expansion 20-1000°C	10^-6 K^-1	8.6	6	6	10.3	-	4.3	5
Thermal conductivity 200°C	Wm^-1K^-1	25	6	2	-	-	100	124
Maximal approximate temp for load-bearing elements³	°C	1700	1600	1400	1500	2000 (w/o load)	1350	1600⁴
Dielectric strength (IEC 672-2)	kV.mm^-1	17	17	17	-	-	-	-
Resistivity at DC voltage 20°C	Ω.cm	10¹⁴	10¹³	10¹³	-	-	-	-
Thermal shock resistance	-	good	excellent	good	good	-	good	excellent
Diameter of pores, av	µm	-	-	-	-	-	-	-
Specific heat capacity 20-100°C	J.kg^-1.K^-1	990	900	900	-	-	-	-

Properties of Porous Materials

Table 2 shows the properties of porous materials.

Table 2. Properties of porous materials

Material	Units	Alsint porous	Sillimantin 60	Sillimantin 65	Sillimantin 60 NG	Sillimantin KS	SiC clay bonded¹	Halsic-R	Halsic-RX	Fused silica
Al₂O₃ content	%	99.5	72-74	78-80	72-74	70	-	-	-	-
Alkali content	%	-	1	1	1	1	-	-	-	-
SiC content	%	-	-	-	-	-	70-90	99	99	-
Si-free	%	-	-	-	-	-	-	0.1	0.1	-
Type according to DIN EN 60672	-	-	C 530	-	-	-	-	-	-	-
Water absorption capacity	%	2.7	9	11	6	9	8-13	5	5	4.6
Leakage rate at 20°C	hPa dm³s^-1	-	-	-	-	-	-	-	-	-
Bulk density	g.cm^-3	3.6	2.40-2.45	2.45-2.50	2.60	2.40-2.45	2.2-2.5	2.7	2.7	1.92-2
Flexural strength 20°C (3-point)	MPa	70-110	45	55	60	45	30	80-100	80-90	30-40
Flexural strength 1300°C (3-point)	MPa	-	-	-	-	-	-	90-110	90-110	45-60²
Young’s modulus	GPa	-	60	75	85	60	-	280	280	30-40
Hardness (Mohs scale)	-	-	-	-	-	-	-	-	-	-
Thermal expansion 20-700°C	10^-6 K^-1	7.8	5.3	5.3	5.2	5.3	5	3.9	3.9	-
Thermal expansion 20-1000°C	10^-6 K^-1	8.6	5.7	6.3	5.7	5.7	5	4.5	4.5	0.5-0.9
Thermal conductivity 200°C	Wm^-1K^-1	-	1.4	1.4	-	1.4	-	35	35	-
Maximal approximate temp for load-bearing elements³	°C	1700	1350	1400	1600	1350	1300	1600⁴ 2000⁵	approx 1650⁴	1000
Dielectric strength (IEC 672-2)	kV.mm^-1	-	-	-	-	-	-	-	-	-
Resistivity at DC voltage 20°C	Ω.cm	-	-	-	-	-	-	-	-	-
Thermal shock resistance	-	good	excellent	excellent	good	excellent	excellent	excellent	excellent	excellent
Diameter of pores, av	µm	1-3	2	1.5	8.5	2	3	24	24	0.2
Specific heat capacity 20-100°C	J.kg^-1.K^-1	-	800	900	900	-	-	-	-	-

Results and Discussion

The listed values pertain to test specimens. They are only for reference purposes and cannot be unconditionally applied to other dimensions and shapes. Practically, Alsint 99.7 components provide mechanical strength values between 160 and 300 MPa, based on their actual shape, wall thickness, surface finish, post-processing and shaping process.

The test specimens were subject to the following conditions:

Since different qualities are available (and for reference purposes only)
At 700°C
Dependent upon load
Under oxidizing conditions
Under inert atmosphere

This information has been sourced, reviewed and adapted from materials provided by Morgan Advanced Materials.

For more information on this source please visit Morgan Advanced Materials.

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