Zirconia (zirconium dioxide)is a ceramic material that has rapidly found use in many applications such as structural ceramics, automotive oxygen sensors and dental ceramics. The superior wear resistance and mechanical strength of zirconia has also led to its use in applications such as bearings and grinding media. Instead of pure zirconia material, additions of some oxides (MgO, CaO, Y2O3) are put in to make zirconia more stable. Yttria stabilized zirconia is most widely used, its main properties are:
*High temperature capability up to 850oC
*High density
*High strength and fracture toughness
*High hardness and wear resistance (far higher than Stainless steel, Brass, Plastics)
*Low thermal conductivity (20% that of Alumina)
*Good chemical resistance
*Ionic conductivity
Unipretec is a professional advanced ceramic expert focusing structural parts, our zirconia products include:
Ceramic Grinding Medias(grinding balls, grinding cylinders), Ceramic Tubes/Bushings/Sleeves, Ceramic Rods, Ceramic Nozzles, Ceramic Cutters, Ceramic Ball Valves(balls and seats), Ceramic pump seals and shafts and other wear resistant components.
Manufacturing of Advanced Ceramics
The manufacturing of ceramics is done with powders. These are formed either by moulding or pressing, and then fired at high temperature well above 1200° C - called sintering. The ceramic material forms litteraly up during that sintering process and acquires its final properties. This densification stage of the material goes along with a reduction in size - shrinkage - that alters the original dimensions.
The final shape can then be achieved by various methods depending upon the required precision. If the tolerances are loose, direct moulding may be sufficient or additional machining before sintering can be operated when the material is still soft and easy to machine. If the tolerances are tight, the part will have to be ground after sintering once the material is hard.
About Unipretec
UniPreTec, advanced ceramics expert, provides component and custom integrated packaging solutions for Aerospace, Medical, Power Generation & Distribution, Automotive, Process Control & Monitoring, Industrial Equipment, Electronic & Electrical. Our materials include Alumina, Zirconia, Zirconia Toughened Alumina, Silicon Carbide, Silicon Nitride and further special materials. Our technologies and equipments allow us to provide various and flexible forming processes, like dry pressing, isostatic pressing, extrusion, injection moulding and slip casting.
Characteristics |
Unit |
95 Al2O3 |
99 Al2O3 |
ZrO2 |
GPSi3N4 |
BN |
Glass Ceramic |
Crystal Structure |
- |
hexagonal |
hexagonal |
tetragonal |
hexagonal |
hexagonal |
- |
Color |
- |
white |
ivory |
white |
gray |
white |
white |
Density |
g/cm³ |
3.65 |
3.88 |
5.95 |
3.22 |
2.26 |
2.55 |
Water Absorption |
% |
0 |
0 |
0 |
0 |
0.0-1.0 |
0 |
Young's Modulus |
Gpa |
280 |
350 |
205 |
295 |
670 |
65 |
Vickers Hardness |
Gpa |
14 |
20 |
12 |
18-20 |
- |
- |
Flexural Strength |
Mpa |
280 |
300 |
900 |
650 |
51 |
100 |
Compressive Strength |
Mpa |
2000 |
2500 |
2200 |
2200 |
230 |
500 |
Thermal Conductivity |
W/(m•K) |
18-25 |
30 |
2.2 |
25 |
20 |
1.70 |
Thermal shock resistance |
ΔT(C°) |
220 |
180-200 |
280-350 |
450-650 |
>1500 |
25-100 |
Max. Working Temperature |
C° |
1500 |
1700 |
850 |
1200 |
960 |
800 |
Volume Resistivity |
Ω . cm |
>10^15 |
>10^14 |
>10^12 |
>10^14 |
10^13 |
10^16 |
Dielectric Constant |
- |
9.50 |
9.80 |
26 |
8.20 |
4.08 |
6.02 |
Dielectric Strength |
kV/mm |
16 |
22 |
- |
16 |
375 |
40 |
UNIPRETEC is in providing solutions to difficult problems using the most high-tech advanced ceramics precision components and products. We develop, manufacture and supply precision products which required hard wearing, lightweight, non-contaminating, with excellent chemical resistance, good thermal shock and offer enhanced electrical and thermal insulation properties.
With many years of experience in research and development in advanced technical ceramic materials, process development, manufacturing of precision components and small assemblies for the various niche applications for the automotive, aerospace, oil & gas industries, foundries, industrials, food, medical, chemical etc. and also consulting & working with most advanced ceramics manufacturing companies around the world, we are now able to offer following services:
- Design, research & development of materials
- Material processes and manufacturing of precision components & assemblies
- Manufacturer & supplier of quality precision components made from advance technical ceramics with reasonable price and excellent delivery
- Consultation for product development, manufacturing & quality control
- Business development
- Sales & Marketing.
Advance engineering ceramic materials:
- Aluminium Oxide (Al2O3)
- Zirconium Oxide (ZrO2)
- Silicon Carbide (SiC, SiSiC)
- High pressured & Hot pressed sintered Silicon Nitride (GPSN & HPSN)
- Boron Carbide (B4C)
- Aluminium Nitride (AlN)
- Machinable Ceramics (Glass Ceramic & Boron Nitride)
We welcome any opportunity related to above products from any one who are interested in for development or sourcing high tech ceramic components from us. If you need any further information, please do not hesitate to contact us at our office or if you may need my visit for further detail discussion, please do not hesitate to contact me either.