Wear And Corrosion Resistant Industrial Ceramic Parts Petroleum Industry Equipment
Machinable Glass Ceramic is an outstanding engineering material and is machinable with ordinary metalworking tools. It has a low thermal conductivity and is a useful high temperature insulator. Further more, it is an excellent electrical insulator and has a high maximum use temperature (800°C continuous, 1000°C peak). No longer is it necessary to staff a ceramic specialist with high temperature kilns or specialized diamond grinding equipment.
Main Properties of Machinable Glass Ceramic
| ITEM | UNIT | MGC |
| Type | - | Glass Ceramic |
| Density | g/cm3 | 2.55 |
| Color | - | white |
| Water Absorption | % | 0 |
| Young Modulus | Gpa | 65 |
| Vickers Hardness | Gpa | - |
| Compressive Strength | Mpa | 500 |
| Flexural Strength | Mpa | 100 |
| Thermal Conductivity | W/m.K | 1.70 |
| Thermal Shock Resistance | Δ(°C) | 25 - 100 |
| Max. Working Temp. | °C | 1000 |
| Volume Resistivity | Ω ·cm | 10^16 |
| Dielectric Constant | - | 6.02 |
| Dielectric Strength | kV/mm | 40 |
* Tests under room temperature environment;
* The above information is offered for comparison only. Exact
properties will vary depending on the manufacturing method
Machining
Machining tolerances are surprisingly tight, up to10 microns (.0005”).It can bemachined to a surfacefinishof less than 0.5 micron (20 microinch) and polished to a smoothness of 125 angstroms 0.5 microinch) average roughness. Most conventionalmachining processes can be used. Configurationsare limited only by available equipment and theexperience of the machinist.
>>> Typical Applications
- Precision coil formers, high voltage insulators
- Laser industry
- Spacers/reectors/cavities in laser assemblies
- High vacuum industry
- Thermal breaks
- Coil supports
- Vacuum feedthroughs
- Aerospace/space industry
* We also provide machining services according
to customers specifications or drawings.
We are 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, food industrials, medical, chemical etc. and also consulting & working with most advanced ceramics manufacturing companies around the world.
| Unit | 95Al2O3 | 99Al2O3 | ZrO2 | GP-Si3N4 | 99BN | Glass Ceramic |
|
| Color | - | white | ivory | white | black | white | white |
| Density | g/cm³ | 3.65 | 3.88 | 5.95 | 3.20 | 2.00 | 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 ( at R.T. ) | Mpa | 280 | 300 | 900 | 650 | 51 | 100 |
| Compressive Strength ( at R.T. ) | Mpa | 2000 | 2500 | 2200 | 2200 | 230 | 500 |
| Thermal Conductivity ( at R.T. ) | W/(m.K) | 18-25 | 30 | 2.20 | 25 | 20 | 1.70 |
| Thermal Shock Resistance | ΔT(°C) | 220 | 180-200 | 280-350 | 450-650 | >1500 | 25-100 |
| Max. Using Temp. ( at R.T. ) | °C | 1500 | 1700 | 850 | 1200 | 960 | 800 |
| Volume Resistivity ( at R.T. ) | Ω.cm | >10^15 | >10^14 | >10^12 | >10^14 | >10^13 | >10^16 |
| Dielectric Constant (1 MHz at R.T. ) | - | 9.50 | 9.80 | 26 | 8.20 | 4.08 | 6.02 |
| Dielectric Strength | KV/mm | 16 | 22 | - | 16 | 375 | 40 |
The manufacturing route for advanced ceramics include: consolidation of the powder, green machining of the compacted powder, sintering and finally, when required diamond grinding.
>>> Green Machining
This technique is commonly applied to as-pressed parts which are still in a chalky condition. Common metalworking machines are used to machine the part in this soft condition, as greater material removal rates are possible than by post-sintering operations such as diamond grinding. As-fired green machined components are subject to tolerances of approximately +/- 1%. To achieve tighter tolerances, diamond grinding must be employed.
Industrial Ceramic Intriduction
Aluminium Oxide, Al2O3 is the mos
