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CeramTec Rubalit® A 1894 Alumina, 94%

Category Ceramic , Oxide , Aluminum Oxide
Manufacturer CeramTec North America
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF CeramTec Rubalit® A 1894 Alumina, 94%.pdf
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Material Notes:
Rubalit® A 1894 (94%) was specifically developed in response to electrical and electronic engineering needs. In conjunction with CeramTec's complementary metallization systems, a vacuum-tight bond of high strength is achieved. Rubalit® A 1894 has high dielectric strength and volume resistivity combined with good thermal conductivity. The metallization system consists of tungsten overplated with nickel for effective hard solder wetting properties. For soft soldering purposes, an additional tin layer can be applied. The use of special brazing materials (e.g., AgCu solder) assures a reliable interface during processing and handling. Brazing is performed in an inert gas atmosphere or vacuum, using temperature/time profiles specifically adapted for each product. The result is a vacuum-tight ceramic-to-metal joint with high bond strength. Glazes can be optionally applied to each product in order to prevent contamination of the ceramic surface, which helps preserve the ceramic's insulating properties under operating conditions.
Physical Properties Metric English Comments
Density 3.70 g/cc
0.134 lb/in³
Water Absorption 0.00 %
0.00 %
Permeability 0.00
0.00
%, Gas
Weibull Modulus 11
11
Mechanical Properties Metric English Comments
Vickers Microhardness 1290
1290
HV 10
Modulus of Elasticity 320 GPa
46400 ksi
Flexural Strength 380 MPa
55100 psi
Compressive Strength 3600 MPa
522000 psi
Poissons Ratio 0.22
0.22
Fracture Toughness 4.20 MPa-m½
3.82 ksi-in½
K<sub>IC</sub>
Shear Modulus 131 GPa
19000 ksi
Calculated
Thermal Properties Metric English Comments
CTE, linear 5.00 µm/m-°C

@Temperature 20.0 - 200 °C
2.78 µin/in-°F

@Temperature 68.0 - 392 °F
6.50 µm/m-°C

@Temperature 20.0 - 400 °C
3.61 µin/in-°F

@Temperature 68.0 - 752 °F
7.50 µm/m-°C

@Temperature 20.0 - 600 °C
4.17 µin/in-°F

@Temperature 68.0 - 1110 °F
8.30 µm/m-°C

@Temperature 20.0 - 1000 °C
4.61 µin/in-°F

@Temperature 68.0 - 1830 °F
Specific Heat Capacity 0.900 J/g-°C

@Temperature 20.0 - 100 °C
0.215 BTU/lb-°F

@Temperature 68.0 - 212 °F
Average
Thermal Conductivity 18.0 W/m-K

@Temperature 20.0 - 100 °C
125 BTU-in/hr-ft²-°F

@Temperature 68.0 - 212 °F
Component Elements Properties Metric English Comments
Al2O3 94 %
94 %
Electrical Properties Metric English Comments
Volume Resistivity >= 1.00e+7 ohm-cm

@Temperature 800 °C
>= 1.00e+7 ohm-cm

@Temperature 1470 °F
>= 1.00e+11 ohm-cm

@Temperature 400 °C
>= 1.00e+11 ohm-cm

@Temperature 752 °F
>= 1.00e+14 ohm-cm

@Temperature 20.0 °C
>= 1.00e+14 ohm-cm

@Temperature 68.0 °F
Dielectric Constant 10

@Frequency 1.00e+7 Hz
10

@Frequency 1.00e+7 Hz
Dielectric Strength 25.0 kV/mm
635 kV/in
Dissipation Factor 0.0010

@Frequency 1.00e+7 Hz
0.0010

@Frequency 1.00e+7 Hz
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