Product Details
1. Overview of Aluminum Nitride (AlN) Ceramic Tubes
1.1 General introduction
Aluminum Nitride (AlN) ceramic tube is a high-performance hollow cylindrical ceramic component that combines ultra-high thermal conductivity, superior electrical insulation and outstanding high temperature resistance. It is widely adopted in high-power electronics thermal dissipation, high-voltage insulation and high-temperature testing fields, as a premium alternative to ordinary alumina ceramics, beryllium oxide and silicon nitride materials.
1.2 Chemical Composition & Microstructure
- Single-phase dense inorganic ceramic, main component aluminum nitride with tiny sintering aids for compact crystal bonding;
- Fully dense, zero open porosity, smooth solid inner & outer tube walls with excellent air tightness;
- Density: 3.26 g/cm³, lighter than most metal heat sinks, with stable crystal structure without internal crack risks.
2. Manufacturing Process
2.1 Raw Material Batching & Mixing
High-purity AlN powder matched with small amount of sintering additives, uniformly ball milled to remove particle agglomeration, strictly proportioned to guarantee high thermal conductivity and compact sintering effect.
2.2 High Temperature Sintering
Step A: Feed mixed AlN powder into nitrogen atmosphere kilns at 1800–1900 ℃;
Step B: Hold temperature long enough for full densification and grain uniform growth;
Step C: Form compact pure AlN ceramic blank without internal pores;
Step D: Strictly control temperature curve to avoid deformation and internal stress.
2.3 Precision Casting / Extrusion Forming & Controlled Cooling
Step A: Mould AlN powder slurry into hollow tubular blanks via isostatic pressing or extrusion moulds;
Step B: Slow programmed cooling to eliminate uneven internal stress inside tube bodies;
Step C: Cooled tube blanks maintain complete round shape without deformation before post-processing.
2.4 Controlled Finishing Heat Treatment
Secondary annealing treatment to release residual forming stress, improve tube body toughness and avoid cracking during precision machining.
2.5 Blank Cutting & Stock Shaping
Saw large sintered AlN blanks into standard semi-finished tubular stock; grind inner & outer tube surfaces to uniform dimensional standards for commercial supply. Inspect tubes for internal defects (cracks, bubbles, uneven wall thickness) via ultrasonic visual testing; reject defective blanks. This semi-finished tubular stock is raw material set to component manufacturers.
3. Core Performance Profile
3.1 Dominant Thermal Performance (Defining Feature)
- Ultra-high thermal conductivity, close to beryllium oxide but completely non-toxic, ideal for critical heat dissipation scenarios;
- Continuous service temperature: 800 ℃; short peak temperature resistance up to 1000 ℃;
- Excellent thermal stability, withstands rapid heating & cooling without tube cracking;
- Tunable low coefficient of thermal expansion (CTE), compatible with brazing & sealing with common metals.
3.2 Excellent Electrical Insulation
- Ultra-high volume resistivity across wide temperature & frequency ranges;
- High dielectric strength and extremely low dielectric loss, perfect for high-voltage, high-frequency electronic insulation;
- Insulating performance remains stable at elevated temperatures where polymer plastics degrade rapidly.
3.3 Chemical & Vacuum Compatibility
- Resistant to most acids, alkalis, organic solvents and oils; only vulnerable to hydrofluoric acid and strong molten alkali metals;
- Ultra-low outgassing rate after baking, zero trapped gas pores — fully compatible with ultra-high vacuum (UHV) chambers for semiconductor and optical systems;
- Radiation stable under X-ray, gamma and particle irradiation, suitable for nuclear and aerospace equipment.
3.4 Mechanical & Safety Performance
- High compressive strength, rigid tubular structure with strong pressure resistance;
- Non-toxic clean inorganic material without volatile organics, safe for electronic and medical equipment;
- High hardness, wear-resistant inner and outer tube walls, long service life under fluid or gas flushing.
4. Key Limitations
- Not suitable for continuous long-term working environments above 800 ℃.
- Susceptible to corrosion and etching when exposed to hydrofluoric acid.
- Hardness and wear resistance are lower than alumina and silicon carbide ceramics, not the first choice for heavy-duty severe abrasion working conditions.
5. Main Industrial Applications
5.1 Vacuum & Semiconductor
UHV chamber fixing jigs, vacuum feedthrough insulating sleeves, heat conduction isolation spacers, wafer transfer and handling ceramic tubes.
5.2 Aerospace & Spacecraft
Satellite sensor supporting sleeves, space shuttle thermal insulation brackets, radiation-resistant hollow structural components.
5.3 High-Voltage Power Electronics
Coil insulating spools, power supply insulation sleeves, laser resonant cavity isolation tubes.
5.4 Optics & Precision Instruments
Optical platform base sleeves, reflector fixing tube fittings, precision metrology equipment insulating fixtures.
5.5 Medical & Nuclear Industry
Radiation test shielding tubes, non-contaminating laboratory precision positioning jigs, radiation protection insulation parts.
6. Material Positioning
Aluminum Nitride (AlN) ceramic tube fills the performance gap between plastics, metals and ordinary sintered ceramics. It delivers ceramic-grade stable thermal and electrical performance, while possessing unique hollow tubular structural design for heat conduction and insulation. Compared with machinable glass ceramic, AlN owns far superior thermal conductivity for heat dissipation scenarios, and outperforms plastics and metals on high-temperature insulation and vacuum compatibility. It is the preferred high-performance hollow tube material for customized precision parts with low-to-medium production volume, serving harsh working environments including high temperature, ultra-high vacuum and high voltage.
| Technical Data of AlN |
| Property Content |
Unit |
Property Index |
| Density |
g/cm3 |
≥3.30g/cm3 |
| Water absorption(%) |
% |
0 |
| Thermal conductivity |
(20 ℃,W/m.k) |
≥170 |
| Linear expansion coefficient |
(RT-400℃,10-6) |
4.4 |
| Flexural strength |
Mpa |
≥330 |
| Bulk resistance |
Ω.cm |
≥1014 |
| Dielectric constant |
1 MHz |
9.0 |
| Dissipation factor |
1 MHz |
3 x 10-4 |
| Dielectric strength |
KV/mm |
≥15 |
| Surface roughness |
Ra(μm) |
0.3~0.5 |
| Camber |
(~25.4(length)) |
0.03~0.05 |
| Appearance |
|
Dense |
Attention:
1.Surface roughness can be reached 0.1μm after polished.
2.Size tolerance can be controlled in +-0.10mm with laser machined
3.Special specifications can be supplied upon requests.
|
Note: The above data is only for your reference.
Development History
Patents and certification
We’ve obtained various global certifications including CE, EMC, LVD, RoHS, FDA, MSDS, ISO 9001, SGS and TUV. We also own eight registered trademarks and forty technical patents to support independent R&D.
Our proprietary core technologies run through all product lines: porous ceramics, industrial ceramic components, special glass, metallized ceramics, liquid absorption cotton, ozone generators and silicone goods. All products are manufactured in strict accordance with international quality standards, delivering reliable and high-performance solutions that have gained wide recognition and market trust worldwide.
Package
We adopt scientific and standardized packaging solutions tailored to product characteristics to effectively prevent collision, extrusion, dust and moisture damage. With mature global transportation system and strict shipment inspection procedures, we ensure all products remain intact and stable during long-distance delivery, providing customers with safe, efficient and reliable one-stop logistics service.
Services
Inquiry & Customization
We provide fast and accurate quotation response for all your inquiries. Flexible OEM & ODM customization solutions are available to meet your unique product design, packaging and branding requirements.
Order Quality Control
We keep clients updated with full production progress throughout the whole order cycle. Our QC team carries out strict comprehensive pre-shipment inspection to guarantee all goods comply with your quality standards before delivery.
Customs Document Support
We prepare a full set of standard export documents including commercial invoice, packing list, certificate of origin and other certification papers, to ensure smooth global customs clearance for shipments to all destinations worldwide.
One-Stop Logistics
Multiple shipping methods including sea freight, air freight and express delivery are offered to match your schedule and budget. We supply real-time cargo tracking service so you can monitor shipment status anytime.
Flexible Payment
We support a wide range of secure international payment terms such as T/T, L/C, Western Union and other mainstream cross-border settlement methods to reduce your cross-border transaction risks.
After-Sales Support
Our professional after-sales team offers timely technical and business support all year round. We maintain steady long-term stable supply capacity to fully back up your continuous market sales and project demands.
FAQ
01
Question: Can you produce based on customers’ drawings or physical samples?
Answer: Absolutely yes. We accept technical drawings in all mainstream file formats as well as actual physical samples. Before formal production, our engineering team will provide a full professional DFM feasibility evaluation for your reference.
02
Question: How long is the production lead time for custom orders?
Answer: Sample lead time: 3–7 working days. Custom mold lead time: 5–10 working days (we will confirm the cycle separately with you for complex molds). Mass production lead time: 7–20 working days, depending on product structure complexity and order quantity.
03
Question: What’s your minimum order quantity for custom products?
Answer: We provide flexible MOQ solutions for all customized items. We will try our best to set a low minimum order volume to support your small-batch trial orders, meanwhile we can handle stable mass production to satisfy your long-term bulk demands.
04
Question: What customization services can you provide?
Answer: We support comprehensive one-stop customization, including product size, shape, appearance, precision tolerance, surface treatment, hole grooving, bending, cutting and adjustable high-temperature resistant parameters. Custom engraved LOGO and exclusive customized packaging are also available as extra personalized options upon request.
05
Question: Do you accept third-party inspection of finished products?
Answer: Yes, we fully cooperate with all mainstream authorized third-party testing institutions. Well-known organizations such as SGS, BV and other internationally recognized inspection bodies are all acceptable. We can supply complete official inspection reports and material certification documents as you require.
06
Question: Can you customize raw material options for products?
Answer: Sure. We can select and match appropriate raw materials according to your application scenarios, working conditions and performance requirements, including alumina, zirconia, quartz, silicone and other special engineering materials, and adjust related performance parameters to meet your usage standards.
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