Alumina

Modern alumina (Al2O3) products are among the strongest and hardest of all ceramic materials. They also have a high dielectric strength and at elevated temperatures, such as those encountered in many applications, their electrical resistance is excellent.

Alumina ceramics also feature very high mechanical strength, high thermal conductivity, and high resistance to chemical and corrosion attack at room and elevated temperatures. Further, this valuable class of materials can be made extremely hard - second only to diamond on the Mohs' scale, for resistance to wear and abrasion.

Many of alumina's outstanding properties can be enhanced through variation in manufacturing methods and in chemistry. Texas Technical Ceramics, Inc. has earned a reputation for achieving dimensionally accurate alumina parts with excellent quality and reproducibility.
 

Alumina
Properties
Units
ACT 800-850
ACT 900,920,960
ACT 990,997,999
ACTMA 99
Alumina Content
 
80-85%
90-96%
> 99.5%
99%
General Application
 
Lower Cost Electrical & Mechanical
High Strength, Wear Resistant, Electronic, Insulating, Mechanical, Structural & Metalizing
Extremely High Purity, Temperature & Strength; Excellent Corrosion & Wear Resistance
Porous, Easily Degassed & Machinable
Color (Fired)
 
White
White
Off White
White
Porosity
%
0-.05
0-.05
0-.05
Variable
Density
gm/cm3
3.45-3.50
3.55-3.75
3.75-3.95
2.4
Flexural Strength
kpsi
35.0-40.0
40.0-50.0
50.0-55.0
-
Comprehensive Strength
kpsi
260.0
> 300.0
> 300.0
-
Tensile Strength
kpsi
15.0-20.0
20.0-28.0
20.0-28.0
-
Linear Coefficient of Thermal Expansion
(cm/cm/°C)
25-300°C
25-700°C
5.9X10-6
6.5X10-6
6.3X10-6
7.0X10-6
6.5X10-6
7.5X10-6
6.5X10-6
7.5X10-6
Dielecctric Constant at 25°C
1 MH
10 MH
8.5-8.9
8.4-8.8
9.2-9.8
9.0-9.6
9.5-9.9
9.3-9.7
-
Dielectric Strength
Volt/mil
200
225
225
-
Te Value
°F
°C
1472
800
> 1832
> 1000
> 1832
> 1000
> 1832
> 1000
Thermal Conductivity at 25°C
cal/sec/cm2/cm/°C
.03-.04
.04-.06
.07-.08
-
Thermal Shock
 
Good
Good
Good
Good
Safe Use
Temperature
°F
°C
2550
1400
3000-3100
1650-1700
3275
1800
3275
1800

Need a RFQ? Fill out the form to get started!

Texas Technical Ceramics, Inc. (TTC) has a longstanding commitment to our clients, which includes our ability to incorporate traditional business values with innovative advancements in manufacturing.

...more about TTC