Alumina Tube
Alumina Tube
Purity: 95%, 96%, 99%, 99.5%, 99.7%, 99.95%
Diameter: 1-150 mm, or customized
- Custom sizes and standard sizes in stock
- Quick Lead Time
- Competitive Price
Alumina Tube is a high-performance ceramic material primarily composed of alumina with the purity ranging from 90%-99.9%. The additives is designed to enhance its properties. As a leading supplier and manufacturer of premium alumina products, Shanghai Yuepeng utilizes advanced machining centers to produce high-quality alumina tubes for a wide range of applications.
Alumina Tube Data Sheet
| Reference Code: | HM1976 |
| Purity: | 95%, 96%, 99%, 99.5%, 99.7%, 99.95% |
| Color: | White |
| Density: | 3.7-3.98 g/cm3 |
| Outer Diameter: | 1-150 mm, or customized |
| Inner Diameter: | 0.5-140 mm, or customized |
| Wall Thickness: | 0.25-15 mm, or customized |
| Length: | 1-1000 mm, or customized |
Alumina Tube Description
Alumina Tube is made from high-purity aluminum oxide (Al2O3) with typical purities ranging from 90%-99.9%. It has exceptional high-temperature resistance, corrosion resistance, and mechanical strength. With a smooth surface, high hardness, and excellent electrical insulation properties, it performs reliably in demanding conditions. Shanghai Yuepeng can supply customized solutions for various diameters, wall thicknesses, lengths, and surface finishes to meet diverse industrial and research requirements.
Alumina Tube Specifications
| Outer Diameter: | Φ1-150 mm |
| Inner Diameter: | Φ0.5-140 mm |
| Wall Thickness: | 0.25-15 mm |
| Length: | 1-1000 mm |
| Note: Customized services can be available according to specific drawings. | |
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 Tube Advantages
- Excellent electrical insulation properties
- High hardness and mechanical strength
- Wear and abrasion-resistant
- High thermal conductivity and thermal shock resistance
- Low density
- Resistant to strong acid and alkali attack at high temperatures
- Transparent to microwave radio frequencies
- High compressive and dielectric strength
- Very specific thermal conductive and thermal expansion rates
Alumina Tube Applications
- High-Temperature Furnaces: Alumina tubes are widely used as protective sheaths and structural parts in high-temperature furnaces due to their ability to withstand temperatures up to 1700 °C.
- Thermocouple Protection: With excellent thermal shock resistance and insulation, alumina tubes serve as protective housings for thermocouples in harsh industrial environments.
- Electrical Insulation: Alumina tubes act as insulating components in electrical and electronic systems, offering high dielectric strength and stability.
- Chemical Processing Equipment: Their strong resistance to acids, alkalis, and corrosive gases makes alumina tubes suitable for use in chemical reactors, fluid handling, and laboratory equipment.
- Wear-Resistant Parts: Alumina tubes are applied in machinery and industrial systems where abrasion resistance and durability are critical, extending the service life of equipment.
Electrical and Mechanical Applications
High-Temperature Furnaces
Electrical Insulation Layers
Chemical Processing
Industrial Machinery
Alumina Material Properties
Alumina Material Grades
It has a very high purity (99.95%) grade of Alumina (Aluminum Oxide) exhibiting an exceptional combination of mechanical and electrical properties. It features very high hardness, exceptional electrical resistivity, high-temperature mechanical stability and strength in addition to corrosion resistance and bio/chemical inertness.
Its high-temperature stability and electrical stability make it particularly suitable for high-temperature applications such as high voltage/frequency insulators, heating elements supports, etc
Physical Properties:
- Color: White
- Density: 3.98 g/cm3
Applications:
- High-temperature electrical insulators
- Very high voltage/frequency insulators
- Machine components where high wear resistance
is required in an oxidizing environment - Precision shafts in high-wear condition
- Unlubricated (vacuum) or gas/water lubricated
high speed sliding bearings - Shot blast nozzles
- Abrasive flow deflector plates/cones
- Valve seats
- Wire guides
It’s a high-purity grade of Alumina (Aluminum Oxide) and one of the high-performance grades in this range of materials. It features a 99.7% purity Alumina base material that provides a superior set of mechanical and electrical properties while maintaining a reasonable cost. It is a very hard-wearing technical ceramic offering and is ideally suited to a wide range of industrial applications where mechanical and electrical performance is of the essence and the material needs to perform adequately in aggressive environments.
It can be machined in the “green state”- that is before sintering takes place, thus ensuring a large variety of shapes and sizes. It can also be diamond ground to tight tolerances in the fully sintered state using diamond grinding.
Physical Properties:
- Color: Ivory
- Density: 3.9 g/cm3
Applications:
- Electronic components & substrates
- High-temperature electrical insulators
- High voltage insulators
- Laser tubes
- Machined components
- Mechanical seals
- Precision shafts and axles in high-wear environments
- Roller and ball bearings
- Seal rings
- Semiconductor parts
- Shot blast nozzles
- Thermocouple tubes
- Tap plates
- Valve seats
- Wear components
- Wire and thread guides
- Ballistic Armor
99.5% Purity Alumina is a high-performance engineering material with exceptional mechanical strength, high-temperature resistance, and excellent electrical insulation properties. It is widely used in industrial equipment, electronic components, medical devices, and aerospace applications.
Physical Properties:
- Color: Ivory
- Density: 3.9 g/cm3
Applications:
- Electronic components & substrates
- High-temperature electrical insulators
- High voltage insulators
- Laser tubes
- Machined components
- Mechanical seals
- Precision shafts and axles in high-wear environments
- Roller and ball bearings
- Seal rings
- Semiconductor parts
- Shot blast nozzles
- Thermocouple tubes
- Tap plates
- Valve seats
- Wear components
- Wire and thread guides
- Ballistic Armor
99% Purity Alumina Is a premium industrial ceramic material with excellent mechanical properties, ultra-high hardness, high-temperature resistance, and insulation performance. It can maintain stable chemical and physical properties even in extreme environments, making it widely used in semiconductors, electronic components, laser technology, and aerospace.
Physical Properties:
- Color: Ivory
- Density: 3.85 g/cm3
Applications:
- Electronic components & substrates
- High-temperature electrical insulators
- High voltage insulators
- Laser tubes
- Machined components
- Mechanical seals
- Precision shafts and axles in high-wear environments
- Roller and ball bearings
- Seal rings
- Semiconductor parts
- Shot blast nozzles
- Thermocouple tubes
- Tap plates
- Valve seats
- Wear components
- Wire and thread guides
- Ballistic Armor
It is a regular purity grade Alumina (Aluminum Oxide) and it is one of the workhorses of the technical ceramics industry. It features a 96% purity Alumina base material providing a balanced “cost to quality” ratio. It is a hard-wearing technical ceramic offering an excellent combination of both mechanical and electrical properties and is ideally suited to a wide range of industrial applications where cost is of the essence, but the material still needs to perform adequately from a mechanical and electrical standpoint.
It can be machined in the “green state”- that is before sintering takes place, thus ensuring a large variety of shapes and sizes. It can also be diamond ground to tight tolerances in the fully sintered state using diamond grinding.
Physical Properties:
- Color: White
- Density: 3.75 g/cm3
Applications:
- Electronic components & substrates
- High-temperature electrical insulators
- High voltage insulators
- Laser tubes
- Machined components
- Mechanical seals
- Precision shafts and axles in high-wear environments
- Roller and ball bearings
- Seal rings
- Semiconductor parts
- Shot blast nozzles
- Thermocouple tubes
- Tap plates
- Valve seats
- Wear components
- Wire and thread guides
- Ballistic Armor
95% Purity Alumina is an economical and practical engineering material. Its slightly lower alumina content reduces production costs while maintaining decent wear resistance and processing flexibility. It is commonly used in mechanical parts, electrical insulators, and wear-resistant bushings, offering an excellent cost-performance balance.
Physical Properties:
- Color: White
- Density: 3.7 g/cm3
Applications:
- Electronic components & substrates
- High-temperature electrical insulators
- High voltage insulators
- Laser tubes
- Machined components
- Mechanical seals
- Precision shafts and axles in high-wear environments
- Roller and ball bearings
- Seal rings
- Semiconductor parts
- Shot blast nozzles
- Thermocouple tubes
- Tap plates
- Valve seats
- Wear components
- Wire and thread guides
- Ballistic Armor
Alumina Ceramic Machining
Advanced ceramics are formed using methods such as injection molding, die pressing, isostatic pressing, slip casting, and extrusion. After sintering and densification, machining requires diamond grinding. Shanghai Yuepeng applies advanced green and biscuit machining to achieve complex shapes beyond traditional methods. Our machining center offers drilling, grinding, milling, polishing, sawing, tapping, threading, and turning, enabling the production of alumina ceramic components with high precision and complexity. During machining, 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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