Large Diameter Al2O3 Alsint High Alumina Ceramic Tube For Furnace
Specification of the ceramic tube
1. Forming methods: Extrusion, Dry pressed, Hot pressed, Ceramic Injection molding, ISO pressed
2. Material options: different purity alumina (from 95% to 99.8%), zirconia, Silicon carbide, steatite
3. Dimension capability: Min. the inner diameter can be 1mm, Max. the outer diameter can be 800mm
4. Secondary processing: CNC machining, lapping, grinding, precision cutting and so on
5. Tolerance: outer diameter can be 0.005mm, the inner diameter can be 0.01mm, the overall length can be 0.01mm
6. Surface treatment: External and internal surface to be polished, glazed or metalized
Main characteristics of high alumina ceramic tube
1. Exceptional corrosion resistance, it can withstand various strong acid and alkali, like HF, H2SO4
2. Extraordinary electrical insulation, it always us in many high voltage, high-current application
3. Outstanding wear resistance, over 276 times in comparison with stainless steel
4. Great mechanical properties, hardness, compressive and flexural strength are much higher stainless steel
The description of high alumina ceramic tube
The high alumina ceramic tube is made of high purity aluminum oxide range from 95% to 99.5%, it features high-temperature resistance, high wear resistance, and high hardness, as well as chemical stability to resistance most of the acids and alkalis.
The large size high alumina ceramic tubes usually used as a kind of standard protection part for furnace, it plays a very important role in protecting the heating element of the furnace.
Our facility has many selections of stocks with standard sizes for alumina ceramic tubes. Our vast, readily-available inventory allows us to supply our customer’s ceramic tube needs immediately, even for hard-to-find or specialty products.
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 tubes
We also produce lots of different types of ceramic tubes, including the 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 orders, 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 after sending the inquiry?
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 in your factory?
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.
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