Re: Thermal Insulation Materials
- From: Phil Hobbs <pcdh@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 06 Oct 2005 11:31:06 -0400
Alastair wrote:
Hi,
I'm looking for some advice to help me specify a suitable thermal insulation material for a test rig I'm building as part of my research at Cardiff University.
I need to insulate the sides of a rotating disk, used in the test rig. The disk is made from steel, and I need to apply an insulating ring to both faces of the disk, in order to reduce heat losses in a controlled manner.
The rings would be around 75mm outside diameter, 65mm inside diameter, and at least 4mm thick (although this dimension is still to be finalised. I would envisage atttaching the ring to the disk using some form of high temperature adhesive, although a mechanical means of attachment may be possible.
The disk reaches temperatures of up to 300 degrees C, and the ambient temperature within the test chamber is around 80 to 100 degrees C. The insulation material would be subjected to no mechanical loads, but would be rotating with the disk at up to 12000 rpm. In addition, the insulating material would be subjected to a combination of oil sprays and oil mist, from the lubrication system. The oil is a synthetic traction fluid.
I would also need to machine some shallow grooves into the material, to accommodate various sensors which are attached to the disk.
Has anyone got any ideas?
Cheers
Alastair Clarke
The 300C number more or less rules out polymers. Something like a glass foam block from a building supply place could probably be machined crudely using carbide or diamond tools. I'd certainly put a steel band around the outside to keep it from coming apart at 12k rpm. You'd also have to dynamically balance it--if the rotation axis isn't one of the principal axes of the assembled disc, you're going to have a very exciting time. Static balancing isn't enough--that just ensures that the centre of mass lies on the rotation axis.
And I'd certainly put the whole thing inside a steel box before I got it anywhere near 12k rpm.
Cheers,
Phil Hobbs .
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