Material of Shaft

Unobtanium will do everything you want without knowing any of the Physics needed for proper design.

Ceramic will do nicely.

Most ceramics will easily withstand 1000° C but why would the blower be subjected to these temperatures. Steel will also withstand this temperature without being as brittle as most ceramics.

This is another question that violates CR4 rule #14. I'll repeat the pertinent part here:

• Provide as much information as possible. The most frustrating questions on CR4 are like this one: "I need a sensor to test water flow - which is the best one." What are you testing for and what are you trying to determine? Is it in a stream, a pipe, or an aquifer? Are you looking to measure velocity or mass? Are you testing for particulates, mineral concentration, or pollution? Is it wastewater, potable water, slurry, etc.? The more you let us know, the better the chance that someone on the site will be able to help you find an answer.

I anticipate that the OP will never fill in any pertinent information.

Please, khlgupta1972, fill in as much information as you can for us to work with.

Garbage in, garbage out!

This OP seems to follow the norm here of wanting answers to undefined questions.

Also typical, no one seems capable of searching for information on their own, but would rather waste our time with questions they could easily answer themselves.

So, ceramic it is.

What are you going to make the blower impeller out of?

What are you annealing at 1000 degC?

Gupta,

If you are engineer you should know that blower for furnace is externally mounted, so 1000 deg C is the temp. is not surrounding the blower it will be higher than ambient temp. You can use En 8/9 steel for shaft

If you want to save $ or Euros or what ever you use for Money then use what My dad used for the blower on his melting pots for Tungstan doped steel. He used plain old red Bricks. Just be careful the first time you fire up the furnace. The part of the shaft close to the furnace will get very hot. The Brick unless old will have a little water left in them. However bricks are have pors (spelling sorry ) So let the fire build up slow and for a while let it get hotter and hotter slowly the first time. Now. The Bricks were only used for the last few feet of the shaft connecting to the furnace. The Rest of the shaft was Normal HVAC ducting and there was also a two way dampener and the motor for the fan was variable. The way my dad did the thing was cheap and it worked well for years. Decades in fact. And it was made exactly the way he wanted it. As the company grew they used the same design with variations. I always like to over engineer something. If you say 1k Deg C then like my dad I like to go way past that. He started at Boeing as an engineer. In his department they always engineered to the worst possible stesses from turbulence ( He was in the wing and engine mount department ) So the worst possible case. Then add 10% more then a little more for Mom as he used to say. And that is what they did. No Engines ever fell off of a Boing like the airbus where the tail just fell off over WA DC. Just fell off due to some turbulence. That is screwed up engineering. So what are you annealing just for fun. I would like to know. Cesare

Please clarify this fan. If it is supplying combustion air, as Suresh's post suggests, then temperature is not an issue. But if is an internal circulating fan in the hot chamber, both the shaft and the blades must resist high temperature.

Why should anyone bother with engineering details when unobtainium can do anything for anyone.

I wanted to try unobtainium. But I could not obtain any.

can you tell me where to obtain unobtainium as well as the salt form unobtainium Hydrocloride and of course some oxidized unobtainium oxide and lastly a dioxid non salt form unabtainium dioxide. I have found all forms of unobtainium to be unobtainable. If you have attainable unobtainium it would make us all very happy. I even had a Great Dane try to obtain all possible forms of unobtainium. Any help so as to help the man anealle some stuff. And where is Neal?? was he with Ana?

Firebrick.

I got it. I liked it. I re read it. I like it that much. And I am planing on using it. Hope that is OK with you. If not OK then we can ask Ana and Neal. Cesare

How long do you want it to last?

Please provide more information on your application, if not try tungsten.