CeramTec RK 87 Alumina, 99.8%

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CeramTec RK 87 Alumina, 99.8%
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	Aluminas exhibit good mechanical properties such as hardness, compressive and tensile strength, and elastic modulus. They perform well at elevated temperatures.
Key Words:	Al2O3, aluminum oxide
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Physical Properties	Original Value	Comments

Density	3.96 g/cc	DIN EN 623-2
Water Absorption	0.00 %	Open Porosity; DIN EN 623-2
Permeability	0.00	%, Gas
Weibull Modulus	15	DINV ENV 843-5

Mechanical Properties	Original Value	Comments
Vickers Microhardness	2000	HV1; DINV ENV 843-4
Tensile Modulus	406 GPa	Young's; DINV ENV 843-2
Flexural Strength	630 MPa	DIN EN 843-1
Compressive Strength	4000 MPa	DIN 51067T1
Poissons Ratio	0.23	DINV ENV 843-2
Fracture Toughness	4.30 MPa-m½	K_IC (SEVNB); DIN CEN/TS 14425-1
Shear Modulus	165 GPa	Calculated

Electrical Properties	Original Value	Comments
Volume Resistivity	5.00e+8 ohm-cm @Temperature 400 °C	IEC 672-1
	5.00e+14 ohm-cm @Temperature 20.0 °C	IEC 672-1
Dielectric Constant	9.0 @Frequency 1e+6 Hz	IEC 672-1
Dielectric Strength	19.0 kV/mm	IEC 672-1
Dielectric Loss Index	0.0050 @Frequency 9.00e+9 Hz	IEC 672-1

Thermal Properties	Original Value	Comments
CTE, linear	7.50 µm/m-°C @Temperature 20.0 - 400 °C	DIN EN 821-1
	8.50 µm/m-°C @Temperature 20.0 - 1000 °C	DIN EN 821-1
Specific Heat Capacity	0.900 J/g-°C	DINV ENV 821-3
Thermal Conductivity	30.0 W/m-K	DIN EN 821-2
Maximum Service Temperature, Air	1500 °C
Maximum Service Temperature, Inert	1500 °C

Component Elements Properties	Original Value	Comments
Al2O3	99.8 %

Descriptive Properties
Ra = Arithmetic Mean Roughness Value (µm)	<0.05
Thermal Shock Resistance R1 (K)	159	calculated; R1 = [σ_s (1-µ)] / (α·E)

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CCERA906 / 107506

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