Ultra-Pure, High-Temperature Alumina Ceramic Ring for Advanced Industrial Applications

Overview of Alumina Ceramic Rings

Alumina ceramic rings are a type of ceramic product with alumina as the main component. Alumina ceramic rings have high hardness, second only to diamond, and are very wear-resistant. They have good chemical stability and can maintain performance in corrosive environments.

Alumina ceramic rings are commonly used in electronics, machinery, chemical industry and other fields, such as insulating parts, wear-resistant parts, sealing elements, etc., providing reliable protection for the operation of related equipment and products.

Features of Alumina Ceramic Rings

High-Temperature Resistance: They can maintain stability in high-temperature environments without melting or losing structural integrity.

Corrosion Resistance: These rings can resist erosion from a variety of chemicals, including acids and alkalis.

High Hardness and Wear Resistance: With a hardness second only to diamonds, they effectively resist wear and scratches.

High Mechanical Strength: Alumina ceramic rings have high mechanical strength, strong pressure and impact resistance and can maintain a stable shape under vibration and high-pressure environments.

Excellent Insulation Properties: With high resistivity, they act as insulators at room temperature, making them suitable for equipment requiring insulation.

Low Thermal Expansion Coefficient: They can adapt to thermal expansion and contraction under high-temperature conditions, reducing stress and damage caused by temperature changes.

Good Chemical Stability and Biological Inertness: These properties make them suitable for a variety of harsh environments.

Specifications Table of Alumina Ceramic Rings

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
Dielectric Loss Factor (tanδ, 1MHz)	1×10⁻³-3×10⁻³

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Applications of Alumina Ceramic Rings

Due to their excellent properties, alumina ceramic rings play a crucial role in many fields:

Chemical Industry: Widely used in equipment such as distillation columns, absorption towers for liquids and gases, desulfurization systems, and gas-liquid separators. Their corrosion resistance and high-temperature stability make them an ideal material choice.

Electronics Industry: Used as insulating sleeves, electronic ceramic capacitors, and other components to provide reliable insulation for electronic equipment.

Mechanical Field: Employed to manufacture wear-resistant parts like bearings and sealing rings. Their high hardness and wear resistance help extend the service life of machinery.

Aerospace Field: Used for sealing and insulating parts of engines and gas turbines, ensuring flight safety in high-temperature and high-pressure environments.

Medical Devices: Used to manufacture artificial joints due to their good biocompatibility and chemical stability.

Company Profile

Alumina Technology Co., Ltd.! We focus on the research and development, production and sales of alumina products, serving the electronics, ceramics, chemical and other industries. Since its establishment in 2005, the company has been committed to providing customers with the best products and services, and has become a leader in the industry through continuous technological innovation and strict quality management.

Our products includes but not limited to Alumina Boat, Alumina Crucible, Alumina Dish, Alumina Foam Filter, Alumina Plate, Alumina Rod, Alumina Bar, Alumina Balls, Filter Alumina, Nano Alumina Powder, Spherical Alumina Powder, ect. please feel free to contact us.(nanotrun@yahoo.com)

Payment Methods

T/T, Western Union, Paypal, Credit Card etc.

Shipment Methods

By air, by sea, by express, as customers request.

5 FAQs of Alumina Ceramic Rings

Q1: What causes surface quality issues such as spots, plaques, and color differences on alumina ceramic rings?

Surface defects like black, brown, and pink spots are mainly due to iron (Fe) impurities. Pink spots often contain Fe, Cr, and Ni, typically resulting from mechanical iron particles mixing into raw materials or the ceramic production process. Dark spots and plaques are usually caused by ceramic formula, production process, and procedural issues. Overall yellow or gray color differences are mainly due to impurity contamination introduced during production.

Q2: How can surface issues like spots, plaques, and color differences be resolved?

During molding, select high-quality raw materials with low iron content and perform magnetic separation to remove iron when necessary. Check if the ball mill’s lining bricks have fallen off and repair them promptly. Install magnetic separation during slurry transportation and use hot air filtration to prevent rust from entering the material in the hot air system. Line all conveying pipelines with polyurethane whenever possible.

Q3: How should alumina ceramic rings be used correctly?

When using alumina ceramic rings, avoid rapid temperature changes and opt for slow heating and cooling methods. Inspect for obvious defects before use and avoid using cracked or damaged products. Handle and store with care to prevent collisions or drops.

Q4: How should alumina ceramic rings be cleaned and maintained?

Regularly clean the product surface using a mild detergent and a soft cloth. Avoid intense cleaning methods that could damage the surface. Store alumina ceramic rings properly to prevent exposure to moisture, heat, or other chemical substances.

Q5: What is the replacement cycle for alumina ceramic rings?

The replacement cycle of alumina ceramic rings depends on the environment and conditions of use. Generally, it is recommended to remove 1/4 of the ceramic rings after 8-10 months of use and add new ones, and so on, until all the old ceramic rings are replaced.