Corundum Tube

High-Performance Corundum Tube for Industrial Heat Treatment Applications

Our Corundum Tube delivers exceptional thermal stability and chemical resistance for demanding industrial furnace environments. Manufactured from high-purity alpha-phase alumina (Al₂O₃) at 95% to 99.7% concentration, this ceramic tube maintains structural integrity at continuous operating temperatures up to 1700°C, with intermittent capability reaching 1800°C. You'll benefit from its superior gas-tightness, electrical insulation properties exceeding 10¹⁴ Ω·cm at room temperature, and hardness rating of 9 Mohs scale. Our product solves critical challenges in thermocouple protection, vacuum atmosphere processing, and lithium-ion battery material production where contamination control is essential. The tube's thermal shock resistance and minimal outgassing characteristics make it your reliable choice for precision heat treatment operations.

With over a decade of experience in thermal engineering, Hebei Bolin Electric Furnace Manufacturing delivers alumina ceramic tubes that meet stringent industrial standards. Your applications requiring clean, high-temperature environments will benefit from this proven solution.

Technical Specifications

Structural Design and Working Principle

The tube comprises of polycrystalline alumina grains reinforced through high-temperature sintering at 1650°C. This microstructure makes a thick ceramic network with negligible porosity, regularly underneath 2%.

When you coordinated this tube into your heater framework, it capacities through three key mechanisms:

Thermal Boundary Assurance: The thick alumina structure avoids gas saturation and segregates thermocouples or warming components from destructive airs. This expands sensor life by 3-5 times compared to unprotected installations.

Heat Exchange Administration: The tube's warm conductivity permits uniform warm dissemination whereas keeping up a steady warm slope over the divider thickness. Your prepare benefits from reliable temperature profiles.

Chemical Segregation: The inactive Al₂O₃ composition stands up to assault from acids, soluble bases, and liquid metals at lifted temperatures. You dodge defilement issues common with silica-containing ceramics.

Key Performance Advantages

High-Temperature Steadiness: You can work ceaselessly at 1700°C without distortion or stage changes. This temperature capability suits your glass fabricating, metal warm treatment, and progressed ceramic sintering requirements.

Exceptional Wear Resistance: The 9 Mohs hardness avoids disintegration from rough particles in gas streams. Your tube keeps up dimensional exactness all through amplified benefit life.

Electrical Separator: Volume resistivity over 10¹⁴ Ω·cm at room temperature guarantees secure operation in electrically dynamic heater situations. This property is basic for acceptance warming and RF applications.

Chemical Idleness: The tube remains steady in oxidizing, lessening, and unbiased airs. You can handle responsive materials without cross-contamination concerns.

Low Warm Development: The controlled development coefficient of 8.0 × 10⁻⁶ /K minimizes warm push amid warming cycles. This characteristic decreases break arrangement chance.

Primary Applications

Thermocouple Protection: Install the Corundum Tube as a protective sheath for Type R, S, or B thermocouples in steel mills, glass furnaces, and ceramic kilns. The tube shields your expensive sensors from mechanical damage and chemical attack.

Vacuum Furnace Components: Use as work tubes or muffle tubes in high-vacuum sintering furnaces. The minimal outgassing rate maintains vacuum integrity during your precision sintering processes.

Battery Material Processing: Apply in rotary kilns and calcination furnaces for lithium-ion cathode material production. The alumina tube prevents iron and silicon contamination that degrades battery capacity.

Laboratory Analysis: Integrate into combustion analyzers, thermal gravimetric systems, and controlled atmosphere furnaces. Your analytical results benefit from the tube's dimensional stability and purity.

Semiconductor Manufacturing: Deploy in CVD reactors and diffusion furnaces where silicon wafer processing demands ultra-clean conditions. The tube's low sodium content prevents mobile ion contamination.

Selection Guidance

Immaculateness Level Choice: Select 95% alumina for common mechanical heaters working underneath 1600°C. Select 99.7% immaculateness for applications requiring most extreme temperature capability, chemical resistance, or contamination-free environments.

Dimensional Contemplations: Indicate external breadth, divider thickness, and length based on your heater chamber estimate and mechanical stack prerequisites. We prescribe divider thickness of at slightest 10% of the external breadth for auxiliary integrity.

Thermal Cycling Prerequisites: If your handle includes fast warming or cooling, ask controlled warming rate determinations. Standard proposal is 5°C/min underneath 500°C and greatest 10°C/min over this temperature.

Atmosphere Compatibility: Confirm your heater air composition. The tube performs ideally in discuss, nitrogen, argon, hydrogen, and carbon monoxide environments.

Customization Services

Hebei Bolin Electric Heater Fabricating gives ODM and OEM administrations custom-made to your particular necessities. You can customize:

· Tube measurements: breadth, divider thickness, and length

· End setups: open closes, closed closes, flanged connections

· Surface wrap up: standard sintered, accuracy ground, or polished

· Purity grades: from 95% to 99.7% alumina content

· Quantity: model single pieces to generation batches

We work from your specialized drawings and determinations. Our building group helps with plan optimization for warm and mechanical performance.

Delivery and Support

Production Lead Time: Standard tubes dispatch inside 10-15 days. Custom setups require 25-40 days depending on complexity and quantity.

Quality Affirmation: Each tube experiences dimensional assessment, visual examination, and fabric composition confirmation some time recently shipment.

Technical Bolster: Our building group gives establishment direction, warm cycle programming proposals, and investigating assistance.

Warranty Scope: We offer a 1-year guarantee covering fabric absconds and fabricating issues beneath ordinary working conditions.

Frequently Asked Questions

Q: Can I utilize the tube in a hydrogen atmosphere?

A: Yes, high-purity alumina tubes stay steady in hydrogen and other decreasing environments. Not at all like silica-containing ceramics, they do not experience lessening reactions.

Q: What causes breaking amid starting heating?

A: Warm push from quick warming is the essential cause. Control your warming rate to 5°C/min underneath 500°C. Over this temperature, constrain increments to 10°C/min maximum.

Q: How do I clean sullied tubes?

A: Light stores react to 10% hydrochloric corrosive washing taken after by intensive washing. Resolved defilement may require high-temperature air-firing at 1400°C for 2 hours. Maintain a strategic distance from cleaning strategies that make eutectic stages with alumina.

Q: What's the distinction between alumina and mullite tubes?

A: Alumina tubes offer higher temperature capability and predominant chemical virtue. Mullite tubes taken a toll less and give way better warm stun resistance for applications underneath 1300°C.

Q: Do you give establishment services?

A: We offer on-site establishment bolster, commissioning help, and administrator preparing. Contact our specialized group to examine your particular requirements.

Q: What is the least arrange quantity?

A: We acknowledge orders from single model tubes to generation amounts. Little bunch testing makes a difference you confirm execution some time recently bigger commitments.

Contact Information

For technical specifications, custom quotations, or application support, reach our engineering team directly:

Email: 15720259172@163.com 

Our specialists respond within 24 hours to discuss your Corundum Tube heat treatment equipment requirements and provide detailed technical recommendations.