Alumina ceramic is widely applied in the high-temperature industry because of its excellent resistance to high temperatures. It can withstand high temperatures up to &#;, in addition to its stable chemical properties, high mechanical strength, and electrical insulation. So Alumina ceramic tube is commonly used in high-temperature furnaces, thermocouples tubes, insulating tubes, and corona electrode&#;s square ceramic tubes. In this articles, we would like to discuss how to use alumina ceramic tubes at high temperatures to ensure optimal performance and longevity.
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1. Proper handling and storage
Alumina tubes are brittle, avoid any sudden impacts or shakes to prevent breakage. During storage, it should be stored in a dry and clean environment to prevent contamination.
2. Preheating
When using alumina tubes, we should be preheated gradually, the heating rate should be controlled at 5 degrees per minute until it reaches the desired temperature, the slower the better.
3. Cleaning
Before using aluminum oxide tubes, it is important to clean them thoroughly to remove any impurities or residue. Any foreign matter on the surface of the tube may cause contamination or blockage during use. A combination of solvents, detergents, and/or acid solutions can be used to clean the tubes. After use, don&#;t leave some samples in the tube to avoid chemical reactions that may cause the alumina tube to crack.
4. Heating
When placing or removing the sample, do not exceed 150 degrees and move slowly from the edge to the center. Placing or removing samples at high temperatures is the main cause of alumina tube breakage. Do not touch the high temperature furnace tube with low temperature objects. Repeated thermal cycling can stress the aluminum oxide tubes, causing them to crack or even fail completely. So it is recommended to use the alumina tube at a steady temperature without any sudden changes.
5. Cool down
After use, it is important to cool the aluminum oxide tube slowly to avoid thermal shock. Rapid cooling can cause the tube to crack or even fail completely. It is recommended controlled at 5 degrees per minute until it reaches room temperature.
In conclusion, proper handling, preheating, cleaning, heating, and cooling are essential to ensure optimal performance and longevity of the tube.
Precision Ceramics has further enhanced its existing range of closed-one-end advanced ceramic tubes and insulators with an additional range of open-both-end tubes.
With internal diameters ranging from 0.2mm to 25mm (external diameters from 0.7mm to 31mm) and in lengths from 174mm to 1,060mm, the 34 new items are now available from stock and can be purchased quickly and easily via the new Precision Ceramics Shopping Facility &#;
For customers requiring a non-standard tube length, Precision Ceramics offer a same-day cutting service from within their extensive machining facilities in Central Birmingham, UK.
Thermocouple Protection
Ideally suitable for thermocouple protection in high temperature measurement applications, the alumina-based tubes are used throughout many industries to aid monitoring the stability and performance of production processes especially those within hostile and aggressive chemical environments at temperatures up to 1,700°C. They are manufactured to DIN V ENV and are very strong, organically inert and well proven in a wide field of applications.
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Protection Tubes
Alumina tubes are used as outer protection sheaths. For closed-one-end tubes they are specially produced as a one-piece unit rather than fusing an end piece on making them much stronger and more reliable in operation. The end seal guarantees complete resistance to penetration from the outer atmosphere and coupled with excellent thermal shock resistance, the tubes provide a safe, secure and completely accurate environment for temperature measurement and process monitoring.
Manufactured from almost pure (99.7%) Al2O3, they offer several distinct advantages &#;
Aluminium Oxide (Alumina)
Aluminium oxide (Al2O3), more commonly known as alumina, is a hard wearing material and used throughout many industries. Once fired and sintered, it can only be machined using diamond-grinding methods. Alumina is the most commonly used type of ceramic and is available in purities up to 99.9%. Its combination of hardness, high temperature operation (up to 1,700°C) and good electrical insulation makes it useful for a wide range of applications.
Almost pure alumina (99.7%) provides the highest temperature operation for protection tubes.Comprehensive Range
Initially Precision Ceramics offered a range of 15 Rubalit C 799 Closed-One-End-Tubes with internal diameters ranging from 4mm to 18mm (external diameters ranging from 6mm to 24mm) and in lengths from 530mm to 1,525mm.
These have now been complemented with the additional range of 34 Open-Both-End-Tubes with internal diameters ranging from 0.2mm to 25mm (external diameters from 0.7mm to 31mm) and in lengths from 174mm to 1,060mm.