Alumina ceramic ( Aluminum Oxide or Al2O3 ) is an excellent electrical insulator and one of the most widely used  advanced ceramic materials. Additionally, it is extremely resistant to wear and corrosion. Alumina components are  used in a wide range of applications such as electronics & electrical, pump components and automotive  sensors, medical, semiconductor, furnace parts...

 UNIPRETEC offers a variety of alumina compositions, typical grades that are used for modern industrial applications  are of high purity from 90% to 99.7%.

 Alumina components can be formed by a variety of manufacturing techniques such as dry pressing, cold isostatic  pressing, injection molding and extrusion. Finishing can be accomplished by precision grinding and lapping, laser  machining, metallizing and a variety of other processes.

 Overview of typical properties:

 • Good electrical insulation;

 • High mechanical strength;

 • Excellent wear resistance;

 • Excellent corrosion resistance;

 • Low dielectric constant;

 • High using temperature;

 • High thermal shock resistance...

 Overview of typical applications:

 • Pump seals and other components;

 • Wear resistant inserts;

 • Insulating washers or bushings;

 • Semiconductor components;

 • Aerospace components;

 • Automotive sensors;

 • Electrical or electronic insulators...

Unit

95% Al2O3

99% Al2O3

ZrO2

GP-Si3N4

Color

-

white

ivory

white

gray

Density

g/cm³

3.65

3.88

5.95

3.22

Water Absorption

%

0

0

0

0

Young's Modulus

Gpa

280

350

205

295

Vickers Hardness

Gpa

14

20

12

18-20

Flexural Strength ( at R.T. )

Mpa

280

300

900

650

Compressive Strength ( at R.T. )

Mpa

2000

2500

2200

2200

Thermal Conductivity ( at R.T. )

W/(m.K)

18-25

30

2.2

25

Thermal Shock Resistance

ΔT(°C)

220

180-200

280-350

450-650

Max. Working Temperature ( at R.T. )

°C

1500

1700

850

1200

Volume Resistivity ( at R.T. )

Ω.cm

>10^15

>10^14

>10^12

>10^14

Dielectric Constant  (1 MHz at R.T. )

-

9.50

9.80

26

8.20

Dielectric Strength

kV/mm

16

22

-

16

 - Aluminium Oxide / Alumina ( 95% 96% 99% 99.5% 99.7% Al2O3 )
 - Zirconium Oxide / Zirconia ( Yttria stabilized ZrO2 )
 - Silicon Nitride ( Gas pressure sintered & Hot pressed Si3N4 )
 - Boron Carbide ( B4C )
 - Boron Nitride ( Hot pressed hexagonal BN )
 - Machinable Glass Ceramic

 Aiming at building long term cooperation relationship with our clients, we set our motto as "Quality First". Far now,  our products have been exported to North Amirica, East Europe, West Europe, East Asia, Southeast Asia and get  good reputation from our client.

 >>> Advanced ceramics - also referred to as engineering, structural or technical ceramics - have been processed to  be very pure and, in general, have superior properties to unrefined ceramics. Many are man-made, i.e. they do not  occur naturally, e.g. silicon nitride, and their properties can be enhanced to produce very high strength at high  temperatures, good corrosion resistance, etc.

 Q2: What types of ceramic do you supply?
 >>> Alumina in purity from 90% to 99.7%, yttria stabilized zirconia (Y-PSZ), hot pressed boron nitride, machinable  glass ceramic, boron carbide, silicon nitride, mullite and cordierite.

 Q3: Can I machine the ceramics myself?
 >>> The harder ceramics like alumna and zirconia will require diamond tooling but other materials like Machinable  Glass Ceramic and Hot Pressed Boron Nitride can be machined. To get the right result it does take time, experience  and semi-specialised tooling but it can be done and many of our customers take advantage of this when they need  extremely fast solutions in-house.

 Q4: Can I get a sample or purchase a small quantity?
 >>> Yes, we are happy to supply small samples of material for you to test. We can also supply prototype quantities  through to volume production to suit your needs.

 Q5: How long will it take for you to send me a quote?
 >>> This depends totally on the complexity of your requirements. For simple items such as bars and rods, we can  generally supply a quotation within 24 hours.

 Q6: What's the delivery time?
 >>> For our standard products, like ceramic protection tubes and insulating rods, delivery time is normally 7 working  days. For hot pressed boron nitride and machinable glass ceramic, it's about 10 working days. For customized  products made of alumina, zirconia, boron carbide and silicon nitride, total producing time is about 30 working days.