Alumina Ring
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- High performance at a competitive price.
Alumina rings are precision-engineered ceramic components made from high-purity aluminum oxide. They offer excellent wear resistance, chemical inertness, electrical insulation, and thermal stability up to 1700°C. Ideal for use in high-temperature furnaces, semiconductor equipment, vacuum systems, and corrosive environments. Available in custom sizes and thicknesses.NexusX Advanced Materials, as a premier manufacturer and supplier of high-quality. Alumina (Al2O3) products, focuses on producing high-precision aluminum nitride silicon structural compenents through advanced technologies for diverse application fields.
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Alumina Ring Technical Data Sheet
Purity: | 95%, 96%, 99%, 99.5%, 99.7%, 99.95% |
Color: | White or Ivory |
Density | 3.7-3.98 g/cm3 |
Alumina Ring Descriptions
Alumina rings are high-performance ceramic components manufactured from 95%–99.8% high-purity aluminum oxide (Al₂O₃). They provide exceptional surface hardness (HRA 80–90), outstanding wear resistance, and superior chemical inertness against most acids, alkalis, and solvents. Unlike metal rings, alumina rings are electrically insulating (dielectric strength >10 kV/mm), non-magnetic, and thermally stable from cryogenic temperatures up to 1700°C. These rings are widely used for sealing, spacing, load distribution, and thermal insulation in demanding applications. Typical industries include semiconductor processing, high-temperature furnace construction, chemical reactor sealing, medical imaging equipment (MRI), ultra-high vacuum (UHV) chambers, and precision instrumentation. Custom inner/outer diameters, thicknesses, tolerances, and surface finishes are available upon request.
Alumina Ring Advantages
- High hardness & wear resistance – Excellent resistance to abrasion and surface damage.
- Chemical inertness – Resists most acids, alkalis, and organic solvents.
- High-temperature stability – Operates reliably from cryogenic up to 1700°C.
- Electrical insulation – Dielectric strength >10 kV/mm, prevents current leakage.
- Non-magnetic – Safe for MRI, electron microscopes, and sensitive electronics.
- Vacuum compatible – Non-outgassing, suitable for UHV and semiconductor chambers.
- Low thermal expansion – Maintains dimensional stability under thermal cycling.
- High compressive strength – Withstands heavy loads without cracking or creeping.
- No galvanic corrosion – Eliminates electrochemical reactions when contacting metals.
- Customizable – Available in various diameters, thicknesses, and tolerances.
Alumina Ring Applications
- High-temperature furnaces – Used as spacers, insulation rings, and support components in kilns and vacuum furnaces.
- Semiconductor manufacturing – Precision rings for wafer handling, etching chambers, and CVD/PVD equipment.
- Chemical processing – Sealing rings and gasket backups in pumps, valves, and reactors handling corrosive fluids.
- Vacuum systems (UHV) – Feedthrough rings and spacers in particle accelerators, space simulation chambers, and analytical instruments.
- Medical devices – Non-magnetic, insulating rings for MRI machines, surgical robots, and imaging equipment.
- Electronics & electrical insulation – Mounting rings, standoffs, and isolation rings in high-voltage power supplies and RF systems.
- Aerospace & defense – Lightweight, high-temperature rings for sensors, actuators, and structural assemblies.
- Automotive & EV – Thermal management rings, sensor spacers, and insulation components in battery systems.
Alumina Ceramic Machining
Alumina ceramics are produced through methods such as injection molding, die pressing, isostatic pressing, slip casting, and extrusion. After sintering and densification, machining requires diamond grinding techniques. Advanced Ceramic Hub utilizes cutting-edge green and biscuit machining technology to produce more complex components with traditional methods. Our advanced machining center includes drilling, grinding, milling, polishing, sawing, tapping, threading, and turning, enabling the manufacture of alumina ceramic components with tight tolerances and high complexity. During the machining process, the following precautions should be observed:
- Shrinkage Control: Alumina ceramics shrink by about 20% during sintering, requiring dimensional adjustments in the green body stage.
- Tolerance Control: Precise tolerances are unachievable in the green or pre-sintered state; fine machining should follow sintering.
- Diamond Grinding: Post-sintering, high-hardness alumina requires diamond grinding, as conventional methods fall short.
- Tool Selection: Diamond-coated tools or grinding wheels are essential to handle ceramic hardness and prevent tool damage.
- Temperature Control: Strict temperature management during sintering prevents cracking or deformation.
- Stress Management: Excessive stress during machining must be avoided to prevent brittle failure.
- Cutting Speed and Feed Rate: Controlled speeds and feeds ensure quality and extend tool life.
- Surface Treatment: Post-machining polishing removes defects, enhancing performance and appearance.
Alumina Ceramic Packaging
The Alumina Ceramic products are carefully placed in wooden cases or cartons with additional support from soft materials to prevent any shifting during transportation. This packaging method guarantees the integrity of the products throughout the delivery process.
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- SAFETY DATA SHEET (SDS) -Alumina Ring
FAQ
What is an Alumina Ring?
An Alumina Ring is a ceramic ring made from high-purity aluminum oxide, offering high-temperature resistance, corrosion resistance, electrical insulation, and non-magnetic properties for sealing, thermal isolation, spacing, and load distribution.
What are the main advantages of an Alumina Ring?
The main advantages of an Alumina Ring include extreme hardness, wear resistance, chemical inertness, high-temperature stability (up to 1700°C), electrical insulation, non-magnetic properties, vacuum compatibility, low thermal expansion, and no galvanic corrosion.
Where is an Alumina Ring commonly used?
An Alumina Ring is commonly used in high-temperature furnaces, semiconductor equipment, chemical reactors, UHV systems, medical imaging devices (e.g., MRI), electronic insulation assemblies, and aerospace applications.
Is an Alumina Ring electrically conductive?
No, an Alumina Ring is not electrically conductive. It is an excellent electrical insulator with a dielectric strength >10 kV/mm, ideal for preventing current leakage and galvanic corrosion in high-voltage equipment.
Is an Alumina Ring chemically resistant?
Yes, an Alumina Ring is chemically resistant to most acids, alkalis, and organic solvents, with the exception of hydrofluoric acid (HF) and strong hot alkalis.
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