CeramTec 975 Alumina, 99.5%

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CeramTec 975 Alumina, 99.5%
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	975 (99.5%) offers unique technology by virtue of its optimal dispersion of the MgO phase with the alumina grains. With virtually no transgranular porosity in its microstructure, 975 exhibits high density, superior wear resistance, and moderate flexural strength. Another advantage is its highly uniform white color compared to conventional 99.5% aluminas. The material’s white color remains consistent under either reducing or oxidizing conditions. It can be used for ballistic protection and ceramic armor.
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Physical Properties	Original Value	Comments

Density	3.90 g/cc	DIN EN 623-2 / ASTM-C373 / ASTM-C20
Water Absorption	0.00 %	DIN EN 623-2 / ASTM-C373
Particle Size	2.0 - 3.0 µm	Median Grain (d50)

Mechanical Properties	Original Value	Comments
Vickers Microhardness	1700	HV 0.5; DINV ENV 843-4
Tensile Strength at Break	172 MPa	ACMA Test #4 / DIN EN 843-1
Tensile Modulus	380 GPa	Young's; DINV ENV 843-2 / ASTM-F417
Flexural Strength	310 MPa	20 x 40 mm
Compressive Strength	2400 MPa	ASTM C-773-88 / DIN 51067T1
Poissons Ratio	0.30	DINV ENV 843-2
Fracture Toughness	4.00 MPa-m½	DIN 51109
Shear Modulus	131 GPa

Electrical Properties	Original Value	Comments
Volume Resistivity	>= 1.00e+14 ohm-cm	ASTM-D257
Dielectric Constant	10 @Frequency 1e+6 Hz	IEC 672-1 / ASTM-C150
Dielectric Strength	7.874 kV/mm	6.35 mm (1/4") IEC 672-1
Dissipation Factor	0.00010 @Frequency 1e+6 Hz
Dielectric Loss Index	0.0010 @Frequency 1e+6 Hz	IEC 672-1 / ASTM-D149,150

Thermal Properties	Original Value	Comments
CTE, linear	7.30 µm/m-°C	DIN EN 821-1
	5.60 µm/m-°C @Temperature 20.0 - 200 °C
	7.00 µm/m-°C @Temperature 20.0 - 600 °C	ASTM-C373
	8.00 µm/m-°C @Temperature 20.0 - 1000 °C
Specific Heat Capacity	0.900 J/g-°C @Temperature 100 - 200 °C	DINV ENV 821-3
Thermal Conductivity	35.4 W/m-K	DIN EN 821-2 / ASTM-C408
Maximum Service Temperature, Air	1530 °C

Component Elements Properties	Original Value	Comments
Al2O3	99.5 %

Descriptive Properties
Color	White
Thermal Shock Resistance R1 (K)	225	Hasselman (Experimental)

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CCERA932 / 107532

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