Hello, we are looking for a good thermal insulation material (let's say k < 2 [W/mK]), with reasonable mechanical properties (especially regarding compression), and which can be operated at temperatures up to 1500 C. Any suggestion...? Thank you.
Mr. Alessandro Vicini
with my greeting
selection for the insulation depending on the application not just to limit your selection
the best insulation represent of the duple pyrex glass with vacuum if there is a low value in radiation
you can use the fire bricks with low thermal conductivity
just contact the link below
https://get.rescoproducts.com/international-uk-refractory-brick/?gclid=CjwKCAiAhc7yBRAdEiwAplGxX2Ys_q1saIgM1_AwkcXbOS9eu5JplHJCCMTxpEt7S5oE5QZLOV1zhBoC2-4QAvD_BwE
otherwise you can follow NAٍٍٍSA because institute employed the most moderate insulation material in the world.
I have a component which goes up to 1800K. This is connected through a "tube" of Al2O3 to a metal component; I need to reduce the temperature of the latter.
One idea would be to divide the Al2O3 into several tubes, separated from each other by a thickness of some material with very low thermal conductivity...
1. Fiberglass, 2. Minera Wool, 3. Cellulose 4. Polyurethane Foam 5. Polystyrene
Recently, materials like aerogel (used by NASA for the construction of heat resistant tiles, capable of withstanding heat up to approximately 2000 degrees Fahrenheit with little or no heat transfer), have become affordable and available.
Dear Alessandro:
Do you think silica-based Aerogels could do the work ?
These materials can withstand temperatures well beyond 1,500 °C
There are several forms of solid materials which can be made based in aerogels. However, so far, those which are silica-based are the ones which had shown the best thermal stability against high temperatures.
Look at these videos in YouTube, maybe you can investigate a little more about this fabolous material (look specially at the third video) :
https://www.youtube.com/watch?v=AeJ9q45PfD0
https://www.youtube.com/watch?v=GcdB5bFwio4
https://www.youtube.com/watch?v=qnOoDE9rj6w
Best Luck !
No problem, dear Alessandro!
You can consider corundum foam brick (or corundum ultra light brick, i do not know exactly english terminology). More then 90% Al2O3, working temperature up to 1800 grad. C, thermal conductivity (by 80 grad. C) 0.5...0.8 W/mK. Mechanical properties are like of pine wood, you can cut it with hand saw for metal.
Here is a chinees company, which makes such refractories:
https://rs-refractory.ru/formovannyye-ogneupory/legkovesnyy-ogneupornyy-kirpich/pustotelyy-sharovoy-kirpich/
Please do not forget about chemichal reactions between different refractories by high temperature. Be careful, your tubes are from Al2O3, therefore other refractory oxids (like SiO2, MgO etc) can make liquid eutectic in contact with your tubes.
Mr. Alessandro Vicini
with my greeting
selection for the insulation depending on the application not just to limit your selection
the best insulation represent of the duple pyrex glass with vacuum if there is a low value in radiation
you can use the fire bricks with low thermal conductivity
just contact the link below
https://get.rescoproducts.com/international-uk-refractory-brick/?gclid=CjwKCAiAhc7yBRAdEiwAplGxX2Ys_q1saIgM1_AwkcXbOS9eu5JplHJCCMTxpEt7S5oE5QZLOV1zhBoC2-4QAvD_BwE
otherwise you can follow NAٍٍٍSA because institute employed the most moderate insulation material in the world.
Dear Alessandro Vicini ,
Insulation application of 1500 C is critical. Please be careful to choose the insulation material as well as the wall. I have ever used some insulation materials from a manufacturer but the thermal conductivity was not uniform.
Just to remind you.
Have a nice job.
5 MOST COMMON THERMAL INSULATION MATERIALS
Fiberglass
Mineral Wool
Cellulose
Polyurethane Foam
Polystyrene
https://www.thermaxxjackets.com/5-most-common-thermal-insulation-materials/
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