Corundum, Aluminum Oxide, Alumina, 99.9%, Al 2 O 3

Login to see your most recently viewed materials here. Or if you don't have an account with us yet, then click here to register.

(Viewing data as-entered. Click here to return)

Corundum, Aluminum Oxide, Alumina, 99.9%, Al₂O₃
Categories:	Ceramic; Oxide; Aluminum Oxide
Material Notes:	Alpha aluminum oxide ('corundum' is the mineral name) is the stable form of pure aluminum oxide. Property values below are taken from literature and manufacturer sources. Variations are possible among various commercial grades.
Key Words:	Alpha alumina, Al2O3, aluminum oxide, corundum, aluminium oxide
Vendors:	No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
Printer friendly version Download as PDF Download to Excel (requires Excel and Windows) Export data to your CAD/FEA program Add to Folder:

Physical Properties	Original Value	Comments

Density	3.96 g/cc
Water Absorption	0.00 %
a Lattice Constant	4.7591 Å
c Lattice Constant	12.9894 Å
Formula Units/Cell (Z)	6
Molecular Weight	101.961 g/mol
Weibull Modulus	>= 10

Chemical Properties	Original Value	Comments
Molar Volume	25.575 cc/mol

Mechanical Properties	Original Value	Comments
Hardness, Knoop	1700 - 2200
Hardness, Vickers	1365
Vickers Microhardness	2085
Hardness, Mohs	9.0
Abrasive Hardness	1000
Drilling Hardness	189000
Tensile Strength, Ultimate	300 MPa
Modulus of Elasticity	370 GPa
Flexural Strength	400 MPa
Compressive Strength	3000 MPa
	1900 MPa @Temperature 1000 °C
Poissons Ratio	0.22
Fracture Toughness	4.00 MPa-m½
Shear Modulus	150 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	1.00e+14 ohm-cm
	2.50e+6 ohm-cm @Temperature 900 °C
Magnetic Susceptibility	-0.0000370	cm^3/mol
	-2.30e-7	alternate reference
Dielectric Constant	9.9
Dielectric Strength	10.0 kV/mm	Wide Variation Between Grades

Thermal Properties	Original Value	Comments
Heat of Fusion	1093 J/g
Heat of Vaporization	19380 J/g
CTE, linear	0.600 µm/m-°C @Temperature -173 °C
	3.30 µm/m-°C @Temperature -73.0 °C
	5.50 µm/m-°C @Temperature 25.0 °C
	7.10 µm/m-°C @Temperature 127 °C
	7.50 µm/m-°C @Temperature 227 °C
	7.90 µm/m-°C @Temperature 327 °C
	8.50 µm/m-°C @Temperature 527 °C
	9.10 µm/m-°C @Temperature 727 °C
	9.60 µm/m-°C @Temperature 927 °C
	10.1 µm/m-°C @Temperature 1127 °C
	10.5 µm/m-°C @Temperature 1327 °C
Specific Heat Capacity	0.850 J/g-°C
	0.126 J/g-°C @Temperature -173 °C
	0.502 J/g-°C @Temperature -73.0 °C
	0.753 J/g-°C @Temperature 25.0 °C
	0.920 J/g-°C @Temperature 127 °C
	1.046 J/g-°C @Temperature 227 °C
	1.088 J/g-°C @Temperature 327 °C
	1.172 J/g-°C @Temperature 527 °C
	1.216 J/g-°C @Temperature 727 °C
	1.238 J/g-°C @Temperature 927 °C
	1.247 J/g-°C @Temperature 1127 °C
	1.255 J/g-°C @Temperature 1327 °C
Thermal Conductivity	30.0 W/m-K
	0.0251 cal cm/sec-cm²-°C @Temperature 727 °C
	0.0310 cal cm/sec-cm²-°C @Temperature 527 °C
	0.0451 cal cm/sec-cm²-°C @Temperature 327 °C
	0.0579 cal cm/sec-cm²-°C @Temperature 227 °C
	0.0773 cal cm/sec-cm²-°C @Temperature 127 °C
	0.110 cal cm/sec-cm²-°C @Temperature 25.0 °C
	0.196 cal cm/sec-cm²-°C @Temperature -73.0 °C
	1.075 cal cm/sec-cm²-°C @Temperature -173 °C
	6.30 W/m-K @Temperature 800 °C
Melting Point	2054 °C
Boiling Point	>= 3000 °C
Maximum Service Temperature, Air	1750 °C	No Load
Heat of Formation	-1675.3 kJ/mol	Crystalline

Optical Properties	Original Value	Comments
Refractive Index	1.761	ω, Na
	1.769 @Wavelength 589.3 nm	η, Na

Component Elements Properties	Original Value	Comments
Al2O3	99.9 %

Descriptive Properties
Color	White
Crystal Structure	Rhombohedral	Corundum

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to go back to viewing the property data in MatWeb's normal format.

Users viewing this material also viewed the following:
Aluminum A357.0-T62, Cast
Overview - Alumina, 98%, Al₂O₃
Alumina, alpha Al2O3, 99.5%
Tungsten Carbide, WC
Aluminum, Al

BA1A / 134

	Advertise with MatWeb!
	Data sheets for over 180,000 metals, plastics, ceramics, and composites.
	HOME • SEARCH • TOOLS • SUPPLIERS • FOLDERS • ABOUT US • FAQ • LOG IN

System Message