Heat resistent material

What are your constraints? There are a lot of materials that will withstand 1200°C.

The material should be given a profile better on usual machine -tools

Loads are not important

Better if thermal diffusibility low

Price is not the concern

Are these hot gases Oxidizing? Reducing? Must support be metallic? Nature of forces such that ceramics can withstand? What is load? Is support in tension or compression? These are the kinds of constraints TV45 is suggesting you provide.

I would also ask, what is budget?

The host of this site, global spec, hosts a material search utility. you might have some success browsing here:

http://www.matweb.com/Search/MaterialGroupSearch.aspx?GroupID=181

You can click on either the ceramics link on the left map, or on any of the titanium links for starters.

milo

Are these hot gases Oxidizing? Reducing? Must support be metallic? Nature of forces such that ceramics can withstand? What is load? Is support in tension or compression?

I shall answer in same order:

1-The gases can be both

2-Not especially but it would be preferred due to the need of manufacturing a profile in order to reduce drag at almost sound speed of gas jet

3-Load is low

4-Load leads to a bending so that both tension and compression are present

I would also ask, what is budget?

5-As i mentioned the project is in "evaluation" so that a budget cannot be already estimated but considering some factors the cost can be secondary.

Do you have any suggestion beside the search on the recommended link?

Your question is short of information, but try Tungsten

If it is support during brazing, try graphite

Another line of thought is cooling. Put some internal plumbing in the support and run compressed air through it. Of course thermal shock/stress is more of a factor.

Brad

It was my first thought but the project for many reasons avoids this solution.

Cooling is also a problem since heat transfer is time dependent and thermal difusibility so that if a high temperature flank comes the cooling of the surface takes a time and the surface can reach the high temperature. From an other point of view cooling generates a lot of thermal strains due to the gradient. It ca also lead to a deformation due to same temp grad.

I am very thankful to all of you. I found the family of alloys heat resistant with help of google it is a high Cr alloy (up to 20%) category with a main usage in aeronautics (turbines for instance).

Nick:

Try this link: www.pipingtech.com

They make many different kinds of supports and can handle high temps as well as cryogenic. Their phone number is 713-731-0030. Ask for Joyce Stallings.

Hank

Hi,

I am dealing with the problem of heat resistant alloys for 5 years yet. Especially I'm dealing with nickel based superalloys. These alloys can operate at temperatures up to 1200 centigrades well. They have excellent behaviour at creep conditions, but if there are no external stresses (or small - up to 60MPa at this high temperature) their lifetime is very very high. Also superalloys have excellent corrosion behaviour. After 1000 hours at 1000 centigrades the weight increment is only around 240 x 10E-6 g/cmE2. I recommend nickel based superalloy CMSX-4.

Hi MG,

Thank you very much for the information Could you send more data or a link to get more data about the alloys family you mention?

I would appreciate.

Nickname

Hi,

here you can find some more information about superalloys generally: http://www.msm.cam.ac.uk/phase-trans/2003/Superalloys/superalloys.html

also, there are information at the site of C-M Group (they are producing single crystal superalloys): http://www.c-mgroup.com/cmsx_alloys.htm

the another supplier is Doncasters: http://www.doncasters.com/index.php?s=0

Good luck

MG

Thank you

Nickname