Tungsten has a very high melting point, but it suffers badly from oxidation and will fail at 1000C if exposed to O2. Kanthal A1 is one of the best alloys for a heater coil that can survive in the presence of O2 (leakage) and it is reasonably ductile for forming. Ductility is important because if the material is hard, forming into a coil will cause it to crack and it will fail at the crack.
To get to higher temperatures, non-ductile metals and conductive ceramics (like SiC) are used. Bob Greenyer is getting SiC tube heaters quoted from an company in India - these are good to well over 1500C, but are fragile. On Fri, Apr 3, 2015 at 11:38 AM, Daniel Rocha <danieldi...@gmail.com> wrote: > Can't you use W as a heater? >
