Alumina Washer

Purity: 95%, 96%, 99%, 99.5%, 99.7%, 99.95%

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Alumina washers are high-performance ceramic materials manufactured primarily from high-purity aluminum oxide (Al2O3) through high-temperature sintering. They offer high strength, excellent dielectric properties, wear resistance, high-temperature resistance, and corrosion resistance. As a leading supplier and manufacturer of premium alumina products, we can supply high-quality alumina washers in various specifications at competitive prices, offering customized solutions to meet specific requirements.

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Alumina Washer technical data sheet

Reference Code:	HM1978
Purity:	95%, 96%, 99%, 99.5%, 99.7%, 99.95%
Color:	White or ivory
Density:	3.7-3.98 g/cm³

Alumina washer

The alumina washer is primarily manufactured from high-purity aluminum oxide with rare additives, sintered at a high temperature of 1700℃ to obtain a fully dense product. The molding process can vary depending on the product, with common methods including dry pressing and isostatic pressing. It possesses high-temperature resistance, high strength, excellent wear resistance, good electrical insulation, corrosion resistance, and chemical stability. Advanced Ceramic Hub can supply high-precision alumina washers with tight tolerances, offering customized solutions to meet diverse industrial and research requirements.

Multi-Bore Alumina Tube

Multi-bore alumina ceramic tubes are primarily used as thermocouple protection tubes to protect temperature-sensing elements from corrosion, oxidation, or damage by external substances during use. They are suitable for temperature measurement in air, steam, hydrogen, argon, carbon monoxide, and vacuum environments within the range of 600-1700°C. These tubes come in dual, four, and multi-hole configurations, with a minimum hole diameter of 0.5 mm and lengths up to 2600 mm. Customization is available based on specific customer requirements.

Alumina Washer Advantages

Excellent strength and rigidity
Extremely high hardness (Mohs hardness 9)
Excellent wear resistance
Good resistance to acid and alkali corrosion
High temperature resistance up to 1750°C
Superior electrical insulation
Low dielectric constant and dielectric loss

Alumina Washer Applications

Mechanical sealing : Alumina washers can serve as sealing gaskets in pumps or valves, offering resistance to wear and corrosion.
Electronics industry : Alumina washers can be used as insulating gaskets to insulate and support electronic components in high temperature or high voltage environments.
Chemical equipment : Alumina washers can be used as corrosion-resistant gaskets in pipes or containers, resisting acid and alkaline erosion.
High temperature environments : Alumina washers can be used as insulating or support gaskets in furnaces or heat treatment equipment.

Electrical and Electronic Area
High-temperature Lab
High-temperature Furnaces
Aerospace

Alumina Material Properties

Material	Unit	95% Al2O3	96% Al2O3	99% Al2O3	99.5% Al2O3	99.7% Al2O3	99.95% Al2O3
Density	g/cm³	3.7	3.7	3.85	3.9	3.95	3.98
Bending Strength (20℃)	Mpa	300	300	330	360	380	500-600
Compressive Strength (20℃)	Mpa	2000	2000	2000	2350	2000	3500
Young’s Modulus (20℃)	Gpa	270	275	370	370	380	400
Fracture Toughness (20℃)	MPam^½	3.5	3.5	4	4	4	4.5
Poisson’s Ratio(20℃)	\	0.2	0.22	0.22	—	0.23	0.23
Mohs Hardness(20℃)	HRA	8.0-8.5	8.0-8.5	8.5-9.0	9.0	9.0-9.5	9.0-9.5
Vickers Hardness (HV1)	kg/mm²	1600	1600	1600	1650	1750	1800

Material	Unit	95% Al2O3	96% Al2O3	99% Al2O3	99.5% Al2O3	99.7% Al2O3	99.95% Al2O3
Thermal Expansion Coefficient (25-300 ℃）	10^-6K^-1	6.5	6.5	7.6	7.2	7.2	7.5
Thermal Conductivity (20℃)	W/mk	20	25	27.5	32	32	45
Thermal Shock Resistance	△T·℃	200	200	200	250	—	400
Specific Heat Capacity	J/g·k	—	—	0.79	0.78	0.79	0.80
Max Operating Temperature (Oxygen Condition)	℃	1600	1600	1650	1650	1700	1750

Material	Unit	95% Al2O3	96% Al2O3	99% Al2O3	99.5% Al2O3	99.7% Al2O3	99.95% Al2O3
Volume Resistivity (20℃)	Ω·cm	10¹⁴	10¹⁴	10¹⁴	10¹⁴	10¹⁴	10¹⁴
Dielectric Strength	KV/mm	10	10	10	15	15	16
Dielectric Constant (1 MHz, 25℃)	\	9	9	9.1	9.9	9.9	9.9
Dielectric Loss Tangent (1MHz, 20℃)	tanδ	3*10^-4	2*10^-4	3*10^-4	1*10^-4	1*10^-4	1*10^-4

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Semiconductor parts
Shot blast nozzles
Thermocouple tubes
Tap plates
Valve seats
Wear components
Wire and thread guides
Ballistic Armor

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

Alumina Ceramic products are typically packaged in vacuum-sealed bags to prevent moisture or contamination and wrapped with foam to cushion vibrations and impacts during transport, ensuring the quality of products in their original condition.

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To customize your alumina washer, please provide us with the following information:

Dimensions: Diameter × wall thickness × length.
Purity of the material (95%, 96%, 99%, 99.7%, 99.95%, etc.)
Tolerances: Specify the required tolerances.
Surface Finishes: Polished, rough, etc.
Quantity of the tubes you need
Alternatively, you can provide a drawing with your specifications.

Once we have these details, we can provide you with a quote within 24 hours.

We carry a wide variety of alumina products in stock, and for these, there is generally no minimum order requirement. However, for custom orders, we typically set a minimum order value of $200. The lead time for stock items is usually 1-2 weeks, while custom orders usually take 3-4 weeks, depending on the specifics of the order.

Alumina ceramics is a high-performance ceramic material composed of alumina with a purity ranging from 90%~99.9%. It has excellent heat resistance, corrosion resistance, and high hardness, commonly used in industrial components, electronic substrates, and medical devices.

Alumina ceramic substrates are classified by alumina content, prepAlumina ceramics offers advantages including high strength, wear resistance, high-temperature tolerance (up to 1700 ℃), excellent electrical insulation, and chemical stability, performing exceptionally in harsh conditions.

Alumina ceramics is cost-effective with excellent hardness and wear resistance, ideal for industrial use.
Zirconia ceramics offer higher toughness and fracture resistance and are often used in medical and precision parts.

Advanced Ceramic Hub, established in 2016 in Colorado, USA, is a specialized supplier and manufacturer of graphene products. With extensive expertise in supply and export, we offer competitive pricing and customized solutions tailored to specific requirements, ensuring outstanding quality and customer satisfaction. As a professional provider of ceramics, refractory metals, specialty alloys, spherical powders, and various advanced materials, we serve the research, development, and large-scale industrial production needs of the scientific and industrial sectors.

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Alumina Washer

Alumina Washer

Alumina Washer technical data sheet

Alumina washer

Multi-Bore Alumina Tube

Alumina Washer Advantages

Alumina Washer Applications

Alumina Material Properties

Physical Properties:

Applications:

Physical Properties:

Applications:

Physical Properties:

Applications:

Physical Properties:

Applications:

Alumina Ceramic Machining

Alumina Ceramic Packaging

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Alumina Washer

Alumina Washer technical data sheet

Alumina washer

Multi-Bore Alumina Tube

Alumina Washer Advantages

Alumina Washer Applications

Alumina Material Properties

Physical Properties:

Applications:

Physical Properties:

Applications:

Physical Properties:

Applications:

Physical Properties:

Applications:

Alumina Ceramic Machining

Alumina Ceramic Packaging

Download

Get A Quote

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