Properties of Advanced Technical Ceramics
(1). Excellent in electrical insulation;
(2). High hardness and wear/corrosion resistance;
(3). High working temperature;
(4). Good thermal shock resistance;
UNIPRETEC manufactures & machines industrial ceramic parts and components for the aerospace, industrial, laser, and semiconductor industries. Materials include aluminum oxide, aluminum nitride, zirconia, silicon carbide, silicon nitride, boron carbide, boron nitride, sapphire, cordierite, mullite and others.
Aluminum ceramics are the most widely used ceramics because they offer superior wear and corrosion resistance. Additionally, the raw materials are plentiful, so the powders are low-cost. Compared to other ceramics, aluminum oxide is the lowest cost with one of the highest hardness properties. Aluminum is gas-tight with no open porosity. It is diamond ground to achieve polished surface finishes. Common applications include:
- Sand Blast Nozzles
- Mechanical Seals
- Mud Pump Liners
- Microwave Components
- Grinding Media
- Textile and wire guides
- Oil and Gas choke beans
- Electrical Insulators
Zirconium Oxide (Zirconia) is the toughest ceramic commercially available. We actually have a hammer made out of this ceramic. This high-strength material exhibits excellent wear and corrosion properties. The material can also be HIP'd for added strength and edge retention. Zirconia exhibits a very low coefficient of friction and is available in MgO or Yttria stabilized grades. Common applications include:
- Ceramic razor blades
- Catalyst Extrusion Dies
- Sucker Rod Balls and Seats
- Wear Bushings
- Valve Trim
- Orifice plates
- Guide Rollers and sleeves in metal
- Computer drive components
Sintered Alpha silicon carbide is one of the hardest, most corrosion resistant ceramics commercially available. With no free silicon, this material resists even the strongest acids. Silicon carbide also exhibits excellent thermal conductivity making it a good material for mechanical seals. SIC offers exceptional hardness, heat resistance and thermal shock resistance. Applications:
- Mechanical Seals
- Bushings
- Heat Exchanger tubes
- Spray Nozzles
- Faucet Washers
- Automatic water pump seals
- Valve Trim
Silicon nitride offers one of the best combinations of toughness and hardness of commercially available ceramics. In addition, its low thermal expansion coefficient offers superb thermal shock resistant compared with most other ceramics. Complex geometries can be made with sintered material. The material also exhibits low density, high temperature strength, excellent wear resistance and good facture toughness. Common applications include:
- Diesel engine glow plugs
- Rocker arm pad
- Ceramic ball bearings
- Check Valves for Oil Well Applications
- Resistance Welding Fixtures
- Sand blasting nozzles
- MWD wear parts in Oil Well Drilling
- Poppet valves
- Guide rollers for steel rods and cable
- Molten Aluminum Nozzles and trim
- Valve Trim
Boron Nitride is a high temperature, lubricious ceramic. It offers excellent electrical resistance, chemical stability and wet ability. Common applications include:
- Electric insulators in PVD and CVD Vacuum Coating chambers
- Break Rings for Horizontal Steel Casting
- Evaporator Boats for Aluminum Metallization
- Components for semiconductor manufacturing equipment
- Neutron absorbers
- Boron dopant for Silicon wafer
- Electronic component assembling jigs
- Spacers for glass melts and nonferrous
- Feedthroughs for high voltage equipment
- Nozzles for nonferroud metals
- Crucibles for crystal growth
- Diffusion source wafers
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.