Alumina Washer
- Custom and standard options available.
- Fast lead times guaranteed.
- High performance at a competitive price.
Alumina washers are high-purity ceramic components offering excellent hardness, wear resistance, and chemical inertness. They are electrically insulating, non-magnetic, and thermally stable up to 1700°C. Ideal for high-temperature, corrosive, or vacuum environments where metal washers may fail. 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 Washer 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 Washer Descriptions
Alumina washers are precision-machined ceramic rings made from 95–99.8% high-purity aluminum oxide. They deliver outstanding compressive strength, extreme surface hardness (HRA 80–90), and excellent resistance to acids, alkalis, and solvents. Unlike conventional metal washers, alumina washers provide reliable electrical isolation (dielectric strength >10 kV/mm), non-magnetic performance, and stable operation from cryogenic temperatures up to 1700°C. These washers are commonly used for load distribution, sealing backup, thread protection, and preventing galvanic corrosion in bolted assemblies. Typical applications include semiconductor process chambers, high-temperature furnace fixtures, chemical reactor seals, vacuum feedthroughs, and medical imaging equipment. Custom dimensions, thicknesses, and surface finishes are available upon request.
Alumina Washer Advantages
- High hardness & wear resistance – Withstands repeated compression and friction without deformation.
- Excellent 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 galvanic corrosion.
- Non-magnetic – Safe for MRI, electron microscopes, and sensitive electronic equipment.
- Vacuum compatible – Non-outgassing, suitable for UHV and semiconductor chambers.
- Low thermal expansion – Maintains dimensional stability under thermal cycling.
- Compressive strength – High load-bearing capacity without cracking or creeping.
- No galvanic corrosion – Eliminates electrochemical reactions when contacting metals.
- Customizable – Available in various sizes, thicknesses, and tolerances.
Alumina Washer Applications
- Semiconductor manufacturing – Used in wafer processing, etching, and CVD/PVD chambers as insulating and load-distributing components.
- High-temperature furnaces – Securing heating elements, thermocouples, and insulation layers in kilns and vacuum furnaces.
- Chemical processing – Sealing and protecting bolted connections in pumps, valves, and reactors handling corrosive fluids.
- Aerospace & defense – Lightweight, non-magnetic fastening assemblies for sensitive instrumentation and high-temperature structures.
- Medical devices – MRI machines, surgical robots, and imaging equipment requiring non-magnetic and non-conductive components.
- Vacuum systems (UHV) – Particle accelerators, space simulation chambers, and analytical instruments where outgassing is prohibited.
- Electronics & electrical insulation – Isolating mounting points in high-voltage power supplies, RF systems, and battery packs.
- Automotive & EV – Thermal management systems, sensor mounts, and high-temperature exhaust or brake assemblies.
- Laboratory & analytical instruments – Spectrometers, chromatographs, and plasma systems requiring chemical inertness and precision.
- Marine & offshore – Corrosion-resistant alternative to metal washers in saltwater and harsh coastal environments.
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 Washer
FAQ
What is an Alumina Washer?
An Alumina Washer is a ceramic ring made from high-purity aluminum oxide, offering high-temperature resistance, corrosion resistance, electrical insulation, and non-magnetic properties for load distribution and sealing protection in bolted assemblies.
What are the main advantages of using an Alumina Washer?
The main advantages of an Alumina Washer include extreme hardness, wear resistance, chemical inertness, high-temperature stability (up to 1700°C), electrical insulation, non-magnetic properties, vacuum compatibility, and no galvanic corrosion.
Where is an Alumina Washer commonly used?
An Alumina Washer is commonly used in semiconductor manufacturing, high-temperature furnaces, chemical processing, aerospace, medical devices (e.g., MRI), UHV systems, electrical insulation, and automotive sensors.
Can an Alumina Washer be used in a vacuum environment?
Yes, an Alumina Washer can be used in vacuum environments. It is non-outgassing and highly stable, making it suitable for UHV applications such as semiconductor process chambers and space simulation equipment.
Is an Alumina Washer chemically resistant?
Yes, an Alumina Washer 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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