Is there a better thermocouple protection tube than a corundum tube at 1400℃?

May I ask what occasion it is for? I’d be happy to give some recommendations. Silicon carbide can withstand high temperatures and has very high hardness, but it is also a brittle material and cannot be compared to metals.

Silicon carbide ceramics (1400°C)； Corundum, magnesium oxide, zirconium oxide, molybdenum dioxide (1600°C) ； Silicon nitride, beryllium oxide (1700°C).

Is there no metal at this temperature? The non-metallic feel just isn’t right

Silicon carbide or molybdenum disilicide, replace it when it breaks. With such high temperatures, it’s hard to make a choice

This post was last edited by Sai Xin on 2022-2-15 at 16:44. It involves silicon carbide, and the recommendation is to use silicon carbide that is sintered under pressure-free conditions. This isn’t an act of favoring foreign products; if possible, it’s better to use imported silicon carbide tubes. We are a manufacturer of temperature sensors, and domestic silicon carbide tubes costing a few hundred yuan are still far inferior to imported ones that cost several thousand yuan. The specifications for imported silicon carbide tubes state that they can withstand temperatures up to 1700°C, and even up to 1900°C in a vacuum environment. They are widely used in the hot air furnaces of steel mills. We have also developed another type of high-temperature resistant protective tube, namely a cerametallic tube, which can handle temperatures of up to 1650°C. It is resistant to high temperatures, wear, and corrosion – truly an excellent product. Please refer to the attached materials for more details