Overview of Alumina Ceramic Rings
An alumina ceramic ring is a ceramic product with alumina as the main component. Its hardness is extremely high, second only to diamond, with strong wear resistance; good chemical stability can maintain performance in corrosive environments; high mechanical strength can withstand large pressure and impact. Alumina ceramic rings are widely used in electronics, machinery, the chemical industry and other fields, such as insulating components, wear-resistant parts, sealing elements, etc., to provide reliable protection for the operation of related equipment and products.
Alumina Ceramic Rings
High-temperature resistance: can remain stable in a high-temperature environment, not melting and stable structure
High hardness and abrasion resistance: hardness is second only to diamond, effectively resisting abrasion and scratching.
High Strength: high resistance to pressure and impact, maintains shape stability under vibration and high-pressure environments.
Excellent insulation: high resistivity, insulator at room temperature, suitable for insulating equipment.
Low coefficient of thermal expansion: adapts to thermal expansion and contraction at high temperatures, reducing stress and damage caused by temperature changes.
Chemical stability and biological inertness: suitable for a variety of harsh environments, including the medical field.
Aluminum oxide ceramic ring specification table
| Specification |
Details |
| Material |
Al₂O₃ |
| Purity |
85%-99.8%, common specifications include 95%, 99%, 99.7%, etc. |
| Color |
White or ivory |
| Density (g/cm³) |
3.70-3.92 |
| Hardness (Mohs) |
9 |
| Hardness (HRA) |
85-91 |
| Hardness (HV₁) |
13.8-18 GPa |
| Tensile Strength (Kpsi) |
32-38 |
| Flexural Strength (Kpsi) |
52-55 |
| Compressive Strength (Kpsi) |
300-377 |
| Elastic Modulus (GPa) |
330-380 |
| Fracture Toughness (MPa·m¹/²) |
3-4.5 |
| Thermal Expansion Coefficient (10⁻⁶/℃) |
6.8-7.8 |
| Thermal Conductivity (W/m·K) |
25-32 |
| Thermal Shock Stability (ΔT, ℃) |
198-220 |
| Max Working Temperature (℃) |
1350-1750 |
| Volume Resistivity (25℃, Ω·cm) |
≥10¹⁴ |
| Dielectric Strength (KV/mm) |
15-22 |
| Dielectric Constant (20℃, 1MHz) |
7.6-11.5 |
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Applications of Alumina Ceramic Rings
Chemical industry: used in distillation, gas-liquid absorption, desulfurization systems, gas-liquid separators and other equipment, with corrosion resistance and high-temperature resistance characteristics become the ideal material.
Electronic industry: insulation sleeves, electronic ceramic capacitors and other components provide reliable insulation for electronic equipment.
Mechanical field: manufacturing bearings, seals and other wear-resistant parts, high hardness and wear resistance to effectively extend the life of the equipment.
Aerospace: used for sealing and insulating parts of engines and gas turbines, withstanding high temperature and pressure environments to ensure flight safety.
Medical field: used in the production of artificial joints and other medical devices, good biocompatibility and chemical stability to meet medical needs.
Environmental protection: as a high-efficiency filtration material used in the hydrocarbon adsorption process, removing impurities to ensure a smooth production process.
Company Profile
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials, including boride powder, nitride powder, graphite powder, ceramic products, 3D printing powder, etc.
The company has a professional technical department and Quality Supervision Department, a well-equipped laboratory, and equipped with advanced testing equipment and after-sales customer service center.
If you are looking for high-quality Ceramic Products please feel free to contact us or click on the needed products to send an inquiry.
Applications of Ceramic Products
Process of Ceramic Products
Payment Term
T/T, Western Union, Paypal, Credit Card etc.
Shipment Term
By air, by sea, by express, as customers request.
5 Frequently Asked Questions about Alumina Ceramic Rings
Q1: What are the causes of quality problems such as spots, patches and color differences on the surface of alumina ceramic rings?
Black, brown, brown, and pink spots appear on the surface of alumina ceramic rings: the main impurity is Fe, and pink spots contain Fe, Cr, and Ni, usually caused by raw materials or mechanical iron particles mixed in the production process. Dark color spots (negative spots), black cloudy patches: mainly caused by ceramic formula, production process problems. Overall yellowish or grayish color difference: mainly caused by impurity pollution introduced during the production process.
Q2: How to solve the problems of spots, plaques and color differences on the surface of alumina ceramic rings?
Choose high-quality raw materials with low iron content when molding, and carry out magnetic separation to remove iron if necessary. Check whether the lining bricks of the ball mill fall off and repair them in time. Install magnetic separation and iron removal devices in slurry conveying, hot air furnace and hot air filtering to prevent rust from mixing with materials in the hot air system. Use polyurethane lining for conveying pipes as far as possible.
Q3：How to use alumina ceramic ring correctly?
Avoid rapid temperature change; use slow heating up and cooling down. Check whether there are obvious defects before use, and avoid using cracked or broken products. Handle gently during operation and avoid collision or dropping.
Q4: How to clean and maintain the alumina ceramic ring?
Regularly wipe the surface with mild detergent and a soft cloth; avoid using strong corrosive cleaning methods. Store properly and avoid moisture, high temperature or contact with other chemicals.
Q5: What is the replacement cycle for alumina ceramic rings?
The replacement cycle for alumina ceramic rings depends on the environment and conditions of use. It is generally recommended that after 8-10 months of use, 1/4 of the ceramic ring should be removed, a new ring added, and so on until all rings have been replaced.
