material selection

Please tell us which thermal properties you are looking for. Aluminum will certainly withstand 310°C; why do you need to replace it?

Titanium possibly next and better bet.

This question is so general that half of the metals on the periodic table could be used depending on the exact property needed. Thermal or electrical conductivity? Try copper, silver. Light reflecting? Try rhodium, at $9000 per once, make sure you spread it thin...

Please people, if you need us to spend some time helping you, you could at least invest some time at formulating a question that makes sense. If you intend to become a scientist/engineer don't communicate like a politician...

Iam Sorry for not specifying... but in our univ we just use the thermal property to elucidate whole thermal thing..... but i will specify...

i want to replace aluminium because its not biodegradable...... i want metal or alloy which should be biodegradable....

i want material to withstand at 350 degree Centigrade.......The material should have heat conductivity of > 200 W/m K.... it should have an ability to be rolled in semi or full circle.......

previously i wrote 310degree..... but i found out.... structure i made getting heat to 350deegrees....

Iam really sorry for the inconvinience i caused.... please help me... i would be realy very very thankful to you guys....

You have many people who would be happy to try to help you. The problem is that the term biodegradable normally applies to organic material - not to metals. Metals are not normally consumed by micro-organisms the same way organic matter is. I think you will find it difficult to find an organic material that meets your requirements. You may find a metal such as magnesium that is more reactive than aluminum, however the degradation is not biological. I have heard that at the university level, they have found micro-organisms that consume certain metals, but I don't think you would want to deal with them.

I agree with your post, but a thought just occurred to me that perhaps when we consider the desire to make metals degradable, we should be thinking in terms of the means by which we could cause them to degrade and how to handle them. Many metals can be degraded from the metallic form into a harmless salt by contact with acids. Perhaps we should consider such a process for handling our metallic wastes. Convert them to salts and then dilute them.

Perhaps this is a language issue. By biodegrade, perhaps you mean recycle?

Having biodegradable implies bacteria or other flora fauna consuming the metals. This would be pretty bad news for the bridges rebar and other materials used in our infrastructure. WHo says metallic salts are harmless? in the environment? i'm sure that ALcoa would be glad to learn that they could just dump harmless metal salts into the watershed in Massena New York. Not to mention the ph issues with the acid...

If by biodegrade, you mean environmentally degrade, well, the Conservation folks around here don't take to kindly to leaving auto bodies our in the woods to "environmentally degrade...

If this is not translation problem, it is akin to madness.

milo " glad to be back from my 6 days in europe"

Aluminium degrades when in the presence of oxygen and sunlight.

alot of items degrade...... called oxidation.

In general, metals don't need to be biodegradable because they are easy to separate from other garbages and recycle. Think about it. It took a lot of energy to find the mine, extract the metal from it, and convert it into a useful form. Why would you want to dispose of it when it is so easy to recycle it? Don't forget that metals are a limited resource just like oil. Some day we will have used all the easy sources and then we will be scrambling to extract the metal from the dump sites. We will be much happier to find lumps of metal instead of degraded salts...

You make a great point.

plus, the energy to make the acid to create the salts...

milo

Iam Really very thankful to you guys for helping me out.......

i will consider all these points and discuss with my professor.... lets c what he says..... really iam thankful from the bottom of my heart, to all who replied....

byee..

Rahim Soomro