What material should i use in 1200 °C and "Hydrogen" atmosphere ? High thermal and electrical conductivity is needed. Graphite is good with all of these characterics but wear resistance.
The material i am looking for will be used as an electrical contact roll. No critical stresses or laods. The biggest risk is arc discharge so wear resistance at high temperatures is important (i think creep resistance too). (No reaction with copper will be prefered)
As you know graphite leaves ash like dusts behind. I dont want that. Is there any wear resistant graphite i can find?
After i do some researches i found a Molibden based alloy which is called TMZ. Any ideas about that? Can it be used in conditions like that?
You can check for INCONEL 625. It is a hard metal with good electrical conductivity and melting temperature of nearly 1400 deg C. It can also easily brazed with copper.
For operation at 1200°C in a protective atmosphere (hydrogen, argon or vacuum), there are basically not much metallic materials. If a hard (wear-resistant) and well-conducting surface is necessary, only one material remains - tungsten .
From all metals only tungsten receives an oxide-free and hard surface at 1200°C in protective atmosphere. Molibdenum and tantalum are much softer. Inconel 625 does not work at all, because it is not only very soft at these temperatures but also has an oxidized surface (also in hydrogen!).
Thank you for your suggestions. I actually dont want it to react with copper.
Yeah i know that tungsten is suitable. but its so expensive. The conditions are so harsh, there can be some arc discharges too. Do you have any substrate + coating solutions? The temperature is not 1200 in whole body. Only the contacting surface is that high
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