[katieHaylor (OP)]

Peter says:

I have an aluminium oxide refractory material which is suitable for up to 1400°c. However my needs are for a material that can withstand up to 1700°c.
I would like some suggestions on how this could be possible, the cheaper the better. So please.....no silicon carbide answers, besides, it needs to reflect back as much energy as possible so light e.g. white is necessary.
Would magnesium oxide be useful for this?


What do you think?

[chiralSPO]

Magnesium oxide does have a significantly higher melting point than aluminum oxide, and I think there are some magnesia products that are rated for >2000 °C, but I'm not certain, and it depends what you are trying to do with them.

I don't know what you're trying to do, what scale you need, or how big your budget is, but you can get iridium crucibles that are rated to over 2300 °C. I would imagine these are quite reflective as well.

[Bored chemist]

Iridium crucibles are not only eye-wateringly expensive, but also not as resistant to some materials as you might expect.
It depends what you are heating.