NanoFractalAlumina™
NanoFractalAlumina™ engineered products may be used where high stiffness is required or
where high resistance to thermal condition is desired.

Typical Chemical Composition:
99.9% or better Al2O3
Custom shapes available

Typical Properties:
Color: Ivory
Water absorption: 0%
Gas Permeability: 0%
Flexural Strength (MOR), 20 °C: 460 MPa.
Elastic Modulus, 20 °C: 480 GPa.
Poisson’s Ratio, 20 °C: 0.22
Compressive Strength, 20 °C: 2900 MPa.
Hardness (Knoop, 1Kg): 15.1 GPa.
Fracture Toughness, KIc: 4-5 MPam1/2
Thermal Conductivity, 20 °C: 30W/m°K

Density depends on the shape, typically from 3.8-3.98g/cc.  Please discuss requirement with Mattech.

Picture shows a complex shape made from NanoFractalAlumina™.

This shape is used in superalloy manufacture.

NanoFractalAlumina™ is useful where high toughness, low contamination, high shock resistance and other similar properties are required.

Best Properties of NanoFractal Alumina

 

 

Chemical Formula

 Al2O3

 

Physical

crystal system

hexagonal

Properties

 

chemical formula

Al2O3

 

purity

99.99%

 

 

 

 

specific gravity

3990 Kg/m3

 

 

 

Thermal

melting point

2173K

Properties

softening point

2073 K

 

specific heat at 25°C

800/Kg

 

thermal conductivity at 25°C

(35- 44) J / m . s. K

 

thermal expansion

 

 

face perpendicular to c axis

5.4 x 10/K

 

face parallel to c axis

 

 

Average for NanoFractal

6.2 x 10/K

 

 Average 500-1000K

 (5-8)x 10/K

Mechanical

Hardness Mohs

9-15 approximate

Properties

Knoop scale face perpendicular to c axis

1800

 

Knoop scale face parallel to c axis

2200

 

cleavage

conchoid

 

modulus of elasticity

(4.4 - 4.8) GPa

 

dislocation density

 Approximately 10^9/m^2 (error approximately 2%)

 

modulus of rupture at 25°C

4000 kg/cm

 

compressive strength at 25°C

21000 kg/cm

 

ultimate tensile strength

1900 kg/cm

 

chemical resistance

unattacked by

 

 

common acids

 

 

or NaOH

Chemical

acids and alkalis attack at 300°C

0 (small)

Properties

porosity

0  (small)

Electrical

dielectric constant (permittivity)

7.5 at 10.5

Properties

electrical resistance at 500°C

10 ohm/cm

 

electrical resistance at 1000°C

10 ohm/cm

 

electrical resistance at 2000°C

10 ohm/cm