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Q: Material with variable thermal conductivity ( No Answer,   2 Comments )
Subject: Material with variable thermal conductivity
Category: Science
Asked by: chrisdj100-ga
List Price: $10.00
Posted: 26 Jul 2006 08:03 PDT
Expires: 25 Aug 2006 08:03 PDT
Question ID: 749723
I'm looking for a material that is durable, can be acquired in bulk,
can withstand 700 degress C, and that conducts heat less well at
higher temperatures than at lower temperatures. That is: the thermal
conductivity has an inverse relationship with temperature.
There is no answer at this time.

Subject: Re: Material with variable thermal conductivity
From: ginops-ga on 27 Jul 2006 04:41 PDT
look at macor. You haven't specified over what temperature range you'd
like your specific thermal conductivity to drop or by how much.
Subject: Re: Material with variable thermal conductivity
From: thalmaturge-ga on 31 Jul 2006 02:13 PDT
Kaye and Laby Tables of physical and chemical Constants 16 the edition
page 90 gives thermal conductivities of of refactory materials.
Alumina seems to suit your requirements Lambda (W/m/degree kelvin) =
11 at 773 degrees K and 6 at 1773 degrees Kelvin.

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