Alumina Ring

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

Custom sizes and standard sizes in stock
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The alumina ring is a high-performance ceramic material composed primarily of alumina with a purity ranging from 90% to 99.9%. Additives are used to enhance its properties. It is widely used in mechanical seals, electronic insulation, high-temperature furnace components, and chemical equipment. As a leading supplier and manufacturer of premium alumina products, we can supply high-quality alumina rings with various specifications and competitive prices, offering customized solutions to meet specific requirements.

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Technical data sheet for the alumina ring

Reference Code:	HM1977
Purity:	95%, 96%, 99%, 99.5%, 99.7%, 99.95%
Color:	White or Ivory
Density	3.7-3.98 g/cm³

Alumina ring

The alumina ring is primarily manufactured from high-purity aluminum oxide with rare additives, sintered at a high temperature of 1700℃. The molding process may 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 rings with customized dimensions, shapes, and surface finishes to meet diverse industrial and research requirements.

Advantages of the alumina ring

Low dielectric loss
Large volume resistivity
High resistance
Great hardness
Low coefficient of thermal expansion
Excellent wear and heat resistance

Applications of the alumina ring

Mechanical sealing : Alumina rings can be used as sealing rings in pumps, valves and similar equipment, offering wear resistance, corrosion resistance and high hardness to prolong the life of the seal.
Electronics industry : Alumina rings can be used as insulating rings to support and insulate electronic components, especially in high temperature or high voltage environments.
Chemical equipment : Alumina rings can serve as corrosion-resistant gaskets or lining rings in pipes or reactors, withstanding aggressive acids and alkalis.
High-temperature furnaces : Alumina rings can be used as insulating or support rings, capable of withstanding extreme conditions in high-temperature furnaces.
Grinding and processing : Alumina rings can be used as wear-resistant rings in grinding equipment, improving processing efficiency and accuracy.

Electrical and Electronic Area
High-temperature Lab
High-temperature ovens
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 ring, please provide the following details:

Dimensions : Inner diameter × outer diameter × height (thickness).
Purity of the material (95%, 96%, 99%, 99.7%, 99.95%, etc.)
Tolerances : Specify the required tolerances.
Surface finishes : Polished, rough, etc.
Quantity of rings 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.

La cerámica de alúmina es un material cerámico de alto rendimiento compuesto de alúmina con una pureza que oscila entre 90%~99,9%. Tiene una excelente resistencia al calor, a la corrosión y una gran dureza, y se utiliza habitualmente en componentes industriales, sustratos electrónicos y dispositivos médicos.

Alumina 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 ceramic is cost-effective, with excellent hardness and wear resistance, ideal for industrial use.
Zirconium ceramics offer greater 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 Ring

Alumina Ring

Technical data sheet for the alumina ring

Alumina ring

Advantages of the alumina ring

Applications of the alumina ring

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 Ring

Technical data sheet for the alumina ring

Alumina ring

Advantages of the alumina ring

Applications of the alumina ring

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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Contacts