Customized High Hardness Precision 96% 99% Al2O3 Collared Ceramic
Alumina Tube
Specification of the ceramic tube
1. Available material: Alumina(Al2o3), zirconia ceramic(ZrO2),
Silicon carbide ceramic(SiC), steatite ceramic
2. Shaping methods: Hot pressed, Dry pressed, Extrusion, Ceramic
Injection molding, ISO pressed
3. Dimension capability: Min. the inner diameter can be 1mm, Max.
the outer diameter can be 800mm
4. Tolerance: outer diameter can be 0.005mm, the inner diameter can
be 0.01mm, the overall length can be 0.01mm
5. Surface treatment: External and internal surface to be polished,
glazed or metallized
6. Secondary processing: CNC machining, lapping, grinding,
precision cutting and so on
Main characteristics of the ceramic alumina tube
1. Extreme wear and abrasion resistance., over 276 times in
comparison with stainless steel
2. Extreme high-temperature stability under reducing, inert, and
high-vacuum conditions under high temperature up to 1800°C.
3. Extraordinary electrical insulation, it always us in many high
voltage, high-current application
4. Great mechanical properties, hardness, compressive and flexural
strength are much higher stainless steel
5. Chemical corrosion resistance under high temperature, even if
with strong acid or alkali
6. Protective atmospheres or high vacuum at high-temperature to
eliminate contamination or impurity.
7. Low material cost in high-level applications than other
technical ceramics
Description of the ceramic alumina tube
Alumina ceramic tubes are found across a huge number of user
industries due to cost-effective advantages and high-performance
solutions. The combination of key properties makes them a go-to
product in many different applications:
● High mechanical properties- Alumina work as various structural,
engineering ceramic parts in machinery, equipment.
● Fully dense – Alumina (Al2O3) provides a non-permeable tube that
protects from contamination and can be used to create a gas-tight
assembly.
● Thermally stable – High purity alumina (Al2O3) can be used in
both oxidizing and reducing atmospheres up to 1600°C (2910°F) and
in vacuum furnaces up to 1750°C.
● High chemical resistance – Alumina is chemically inert and not
corroded by water or steam. It offers good resistance to corrosive
substances such as strong acids or alkalis, even at elevated
temperatures.
● Electrical insulation – Alumina is also widely used as an
electrically insulating material. It can be used for insulators
operating at high temperatures (e.g. furnace lead-in tubes,
fuel-cells)
We support numerous customized services to our clients as per their
specific needs, like different materials, different shapes,
different surface quality, different dimension accuracy.
Material Data. Sheet
| General | Property | Units | 99.5% alumina | 99% alumina | 95% alumina |
| Mechanical | Density | g/cm3 | ≥3.85 | ≥3.80 | ≥3.60 |
| Water absorption | % | 0 | 0 | 0 |
| Hardness | HV | 1700 | 1700 | 1500 |
| Flexural strength | Mpa | ≥379 | ≥338 | ≥320 |
| Compressive strength | Mpa | ≥2240 | ≥2240 | ≥2000 |
| Fracture toughness | Mpa m 1/2 | 4-5 | 4-5 | 3-4 |
| Thermal | Max. service
temperature
(Non-loading) | ℃ | 1650 | 1600 | 1450 |
| CTE (20-800℃) | 1×10 -6 /℃ | 6.5~8.0 | 6.2~8.0 | 5.0~8.0 |
| Thermal shock | T(℃) | ≥250 | ≥200 | ≥220 |
| Thermal conductivity (25℃ ) | W/m.k | 30 | 29 | 24 |
| Specific heat | 1 x 10 3 J/(kg·K) | 0.78 | 0.78 | 0.78 |
| Electrical | Volume resistivity (25℃ ) | ohm.cm | ＞1 x 10 14 | ＞1 x 10 14 | ＞1 x 10 14 |
| Insulation strength | KV/mm | 19 | 18 | 18 |
| Dielectric constant (1Mhz) | (E) | 9.7 | 9.5 | 9.5 |
Picture gallery of ceramic sleeve
We also produce lots of different types of ceramic tubes, including
threaded tube, half tube, one end tubes and so on.
Packaging proposal & Transportation methods
1. Vacuum packing with desiccant as an inner package;
2. Then, exported carton as an outer package.
3. Finally, it will be packed with a wooden case if needed.
4. We regularly use DHL, UPS, FedEx, and TNT to ship small parcels.
5. For large volume order, we could ship it by sea as per
customers' needs.
FAQs (Frequently Asked Questions)
Q1: Is it available to produce customized products?
A: We always support custom-made metallic coated ceramic insulators
as per different dimensions, designs, metallization, and platings.
Q2. When can I get the price?
A: We regularly quote within 24 hours after we get your inquiry. If
you are in urgent need of getting the price, please call us or tell
us in your email so that we will proceed with your inquiry as a
priority.
Q3. How long can I expect to get the sample?
A: After you pay the sample charge and send us confirmed files, the
samples will be ready for delivery in 4 weeks. The samples will be
sent to you via express and arrive in 3-5 workdays. You can use
your own express account or prepay us if you do not have an
account.
Q4. How long does the whole procedure being worked out?
A: After you place an order, the manufacturing time is about 25
working days.
Q5. How to ensure quality?
A: The dimension out of any batch will be carried out sampling
inspection per International AQL standard. A 100% cosmetic
inspection will be done.
Q6. Are you a factory or trading company?
A: We are a professional manufacturer. We are warmly welcome
clients from worldwide to visit our factory and cooperate with us.
