Al2O3 Ceramic 6mm,20mm Inert Alumina Ceramic Ball as Catalyst Support Media Ceramic Ball

Overview of Alumina Ceramic Balls

High alumina ceramic balls, also known as ceramic alumina balls, are high-performance materials primarily composed of aluminum oxide (Al₂O₃). With alumina content ranging from 92% to 99.5%, these ceramic balls are renowned for their excellent hardness, wear resistance, and thermal stability. They are widely used in a variety of industries, including grinding, milling, chemical processing, and petrochemical applications. High alumina balls offer exceptional resistance to abrasion and corrosion, making them the ideal solution for high-demand applications requiring superior durability and longevity.

Features of Alumina Ceramic Balls

• High Hardness: Rated at 9 on the Mohs scale, these balls provide excellent abrasion resistance, making them ideal for grinding and milling applications.
• Thermal Stability: Capable of withstanding temperatures up to 1700°C, high alumina balls are suitable for high-temperature processing environments.
• Excellent Wear Resistance: Due to their hardness and low wear rates, these ceramic balls last longer than other types of grinding media, reducing maintenance costs and downtime.
• Corrosion Resistance: They are highly resistant to a wide range of acids, alkalis, and other corrosive substances, making them suitable for harsh chemical environments.
• Low Porosity: Their low porosity minimizes water absorption, ensuring consistent performance in moist environments.
• Chemical Inertness: These ceramic balls are chemically inert, providing stability in sensitive processes like catalytic reactions.
• Customization: Available in various sizes (from 0.5 mm to 50 mm) and shapes (spherical, cylindrical, etc.) to meet specific industry requirements.

Specification of Alumina Ceramic Balls

Property	Specification
Primary Material	Aluminum Oxide (Al₂O₃)
Alumina Content	92%, 95%, 99%, or 99.5%
Other Components	Small amounts of silica (SiO₂), iron oxide (Fe₂O₃)
Density	3.50 g/cm³ to 3.90 g/cm³ (depending on grade)
Hardness	9 on Mohs scale (high hardness)
Bulk Density	2.7–3.7 g/cm³
Water Absorption	<0.01%
Compressive Strength	>2500 MPa
Tensile Strength	150–250 MPa
Modulus of Elasticity	300–350 GPa
Fracture Toughness	3–4 MPa·m^1/2
Thermal Conductivity	20–30 W/m·K
Coefficient of Thermal Expansion (CTE)	7–8 x 10⁻⁶/°C
Maximum Service Temperature	Up to 1700°C (higher for 99% alumina)
Size Range	0.5 mm to 50 mm (commonly 1 mm to 30 mm)
Shape	Spheres, cylinders, or custom shapes
Tolerance	±0.1 mm to ±0.5 mm
Acid and Alkali Resistance	Excellent resistance to acids and alkalis
Oxidation Resistance	High resistance to oxidation at elevated temperatures
Applications	Grinding media, catalyst support, insulation, milling, chemical and pharmaceutical industries
Packaging	Bulk, drums, or bags (typically 25 kg or 50 kg)
Storage	Dry, cool place to avoid moisture exposure

Production Method of Aluminum Oxide Ceramic Balls

Raw Material Selection:

High-purity aluminum oxide powder is chosen as the primary raw material. Depending on the application, the purity can range from 90% to 99.7% or higher.

Mixing:

The aluminum oxide powder is mixed with additives such as binders (for example, organic polymers) and plasticizers to improve workability and ensure the mixture can be shaped into spheres.

Forming:

The mixture is then formed into spherical shapes using one of several methods:

Pelletizing: A process where the mixture is tumbled in a rotating drum with water added gradually to form spherical particles.

Extrusion and Cutting: The mixture is extruded through a die and cut into small pieces which are then rounded.

Injection Molding: In some cases, the mixture can be injection molded directly into the shape of a sphere.

Drying:

Once formed, the green bodies (unfired ceramic shapes) need to be dried to remove any residual moisture. This can be done using air drying, microwave drying, or conventional ovens.

Firing (Sintering):

After drying, the balls undergo a firing process at high temperatures (usually between 1400°C and 1800°C). During this step, the binder burns off, and the aluminum oxide particles fuse together, creating a dense structure.

Firing time and temperature depend on the desired characteristics of the finished balls, such as density and hardness.

Cooling:

The balls are cooled down in a controlled environment to prevent thermal shock, which could cause cracking or other defects.

Quality Control:

Inspection for size uniformity, roundness, surface finish, and physical properties like density and hardness is performed.

Any defective pieces are sorted out and may be recycled back into the raw material mix.

Surface Treatment (Optional):

For specific applications, the ceramic balls might undergo additional treatments, such as polishing or coating, to enhance their performance.

Packaging:

Finally, the inspected and approved ceramic balls are packaged according to customer requirements for shipment.

Applications of Alumina Ceramic Balls

1. Grinding & Milling: Commonly used as grinding media in ball mills and other grinding machines to process materials like minerals, pigments, chemicals, and pharmaceuticals. Their high hardness and low wear rates help achieve finer grinding with minimal contamination.
2. Catalyst Support: In petrochemical and chemical industries, these ceramic balls serve as catalyst support media. Their high surface area and resistance to extreme conditions make them ideal for supporting catalysts in chemical reactions, such as in refining processes and petrochemical production.
3. Heat-Resistant Insulation: Due to their high-temperature resistance, high alumina balls are used in industries that require high-performance insulation materials, such as in furnaces and reactors.
4. Ceramic and Glass Manufacturing: Used as grinding and polishing media in the production of ceramics and glass, where maintaining surface finish quality and consistency is critical.
5. Water Treatment & Filtration: Used in water filtration systems as support for catalytic filtration processes or for mechanical filtration due to their uniform size and chemical stability.
6. Chemical & Pharmaceutical Industry: In chemical reactors, high alumina balls are employed for their ability to resist corrosive chemicals and high temperatures, often acting as support structures in various types of chemical processes.
7. Abrasives & Polishing: These ceramic balls are used in abrasive and polishing applications due to their hardness and smooth surface finish, perfect for polishing delicate or sensitive materials.

Company Profile

Advanced Ceramics founded on October 17, 2012, is a high-tech enterprise committed to the research and development, production, processing, sales and technical services of ceramic relative materials and products.. Since its establishment in 2012, 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 Aluminum Nitride Ceramic Products, Boron Carbide Ceramic Products, Boron Nitride Ceramic Products, Silicon Carbide Ceramic Products, Silicon Nitride Ceramic Products, Zirconium Dioxide Ceramic Products, Quartz Products, etc. 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.

FAQs about Alumina Ceramic Balls

1. What are high alumina ceramic balls made of?

• High alumina ceramic balls are primarily composed of aluminum oxide (Al₂O₃), with varying alumina content (92%, 95%, 99%, or 99.5%) depending on the grade and application.

2. What are the key benefits of using high alumina ceramic balls in grinding?

• The primary benefits include high hardness (9 on Mohs scale), excellent wear resistance, long lifespan, low water absorption, and high chemical and thermal stability. These features make them ideal for grinding hard materials with minimal contamination and maintenance.

3. What industries use high alumina ceramic balls?

• High alumina balls are used in a variety of industries, including mining, cement, ceramics, petrochemicals, pharmaceuticals, chemicals, and water treatment. They are commonly found in applications like grinding, catalyst support, high-temperature insulation, and polishing.

4. How do high alumina balls compare to other grinding media?

• Compared to traditional grinding media such as steel balls, high alumina balls have a higher hardness, lower wear rate, and better corrosion and chemical resistance, which makes them more durable and effective for certain grinding and milling processes, especially in sensitive or aggressive environments.

5. Are high alumina ceramic balls resistant to heat?

• Yes, high alumina ceramic balls are highly resistant to heat and can withstand temperatures up to 1700°C (depending on the alumina content). This makes them suitable for high-temperature applications in industries like ceramics, metallurgy, and chemical processing.

6. How are high alumina balls used as catalyst support media?

• In catalytic processes, high alumina ceramic balls serve as support structures for catalysts in chemical reactors. Their high surface area, stability, and resistance to high temperatures make them ideal for supporting catalytic materials that facilitate chemical reactions.

7. What sizes do high alumina ceramic balls come in?

• High alumina ceramic balls are available in a range of sizes, from 0.5 mm to 50 mm in diameter, with spherical being the most common shape. They can also be customized for specific industrial applications.

8. How should high alumina ceramic balls be stored?

• High alumina balls should be stored in a dry, cool environment, away from moisture, to prevent any potential damage or degradation. Proper storage ensures their longevity and performance.