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Refractory Metals - Composites -Special Alloys -
Ceramics -Tungsten - Titanium
Aluminum
Oxide (Alumina) & Alumina Products
Alumina is the most versatile
engineered ceramic because of its high temperature service limit
along with its chemical, electrical and mechanical properties.
It is also relatively low cost, is easily formed and finished
using a number of fabrication methods including injection
molding for low cost, high volume production runs. It is often
compounded with silica or trace elements to enhance its
properties or fabrication and commonly will range from 92% to
99.8% Al2O3. Higher purity, gel cast material can be found under
our REPTON brand.
Alumina engineered ceramic parts can
be formed by single axis pressing, isostatic pressing, injection
molding, slip casting, or extrusion. Parts can "green machined"
to near net size before firing and then "hard" ground using
diamond tooling to tolerances less than 0.0002" (0.005 mm).
Special grades of alumina can be metallized and/or brazed to
metal parts.
For special grades of ISOPRESSED alumina for plain and metallized tubes see our
ISO ALUMINA Data Sheet and for very large gel cast
shapes and ultra high purity (99.99%) see our
REPTON and
SEMICONDUCTOR pages.
Alumina Oxide (Alumina) Properties
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| Properties |
Condition |
Units |
960P |
975P |
998P |
96S |
IP-95 |
IP-99 |
| Mechanical |
| Al2O3
Minimum |
- |
% |
96.0 |
97.6 |
99.8 |
96.0 |
99.5 |
95.0 |
| Bulk Density |
20°C |
g/cm3 |
3.67 |
3.72 |
3.96 |
3.77 |
3.65 |
3.85 |
| Tensile
Strength |
20°C |
MPa |
205 |
205 |
220 |
nd |
160 |
240 |
| Flexural
(Bending) Strength |
20°C |
MPa |
375 |
375 |
410 |
295 |
300 |
350 |
| Elastic Modulo |
20°C |
GPa |
300 |
355 |
375 |
nd |
300 |
350 |
| Hardness |
20°C |
MPa |
10 |
12 |
14 |
nd |
nd |
nd |
| Fracture
Toughness |
20°C |
MPa-m1/2 |
4-5 |
4-5 |
4-5 |
nd |
nd |
nd |
| Porosity |
20°C |
% |
0 |
0 |
0 |
0 |
0 |
0 |
| Thermal |
Max. Working temperature
Coef. Thermal Expansion |
- |
°C |
1600 |
1650 |
1700 |
na |
1500 |
1700 |
|
25-300°C |
10-6 /°C |
7.1 |
7.2 |
7.8 |
6.7 |
7.1 |
7.8 |
|
25-1000°C |
10-6 /°C |
7.4 |
7.7 |
8.1 |
7.4 |
8.1 |
8.0 |
| Thermal
Conductivity |
20°C |
W/m°K |
24 |
26 |
28 |
28.6 |
20 |
25 |
| Electrical |
| Dielectric
Strength |
2.5mm tk |
ac-kv/mm |
9.2 |
9.2 |
10 |
30 |
20 |
20 |
| Dielectric
Constant |
1
MHz |
- |
9.0 |
9.4 |
9.7 |
9.8 |
9.0 |
9.2 |
|
Volume Resistivity |
20°C |
Ohm-cm |
>1014 |
>1014 |
>1014 |
>1014 |
>1014 |
>1015 |
|
300°C |
Ohm-cm |
109 |
109 |
1010 |
1012 |
nd |
nd |
|
1000°C |
Ohm-cm |
106 |
106 |
106 |
107 |
nd |
nd |
| Loss Tangent |
1
MHz |
- |
0.028 |
0.012 |
0.009 |
0.0015 |
0.0003 |
0.0002 |
| Dissipation
Factor |
1
MHz |
- |
0.0003 |
0.0002 |
0.0001 |
- |
- |
- |
|
Electrical |
IP,DP,CIM,SC,EX |
TC |
IP |
| IP= Isopress DP= Dry press SC=
Slip cast CIM= Ceramic injection molding TC= Tape cast EX=
Extrusion |
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Chemical names and
formulas: |
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formula |
Al2O3 |
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name |
aluminum
oxide |
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IUPAC name |
oxo-oxoalumanyloxyalumane |
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alternate names |
alumina
| keto-ketoalumanyloxy-alumane | |
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oxo-oxoalumanyloxy-alumane
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oxo-oxoalumanyloxyalumane |
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mass fractions |
Al
(aluminum) 52.9% | O (oxygen) 47.1% |
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Structure Diagram |
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Basic Properties |
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Molecular Weight |
101.9613
g/mol |
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Phase |
solid
(at STP) |
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Melting point |
2040°
C |
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Thermodynamic properties |
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Specific heat of fusion |
1.09
kj/g |
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Chemical identifiers |
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GAS number |
1344-28-1 |
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PubChem CID |
14769 |
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Toxicity properties |
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Odor |
odorless |
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Short-term exposure limit |
20
mg/m3 |
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