Joining Corundum and Steel

Hi-Temperature Ceramic - Aremco: High Temperature Adhesives ..

Not an endorsement.

Look at this.

This definitely looks like a promising option. Can't seem to find the price though. But it looks like it would fulfill all the requirements. Thank you.

At the risk of telling you your job, have you taken the differential thermal expansion of the materials into account?

The three elements of the laminate will be at roughly zero stress at the adhesive cure temperature. Your steel will out grow your ceramic as the temperature rises above that.

Thank you for the friendly warning. I do not expect the thermal expansion to be a major problem. However if you have any idea what other material could act as a good electrical insulator on top of steel at this temperatures, I would be very glad to hear it. Since I work mostly with ceramics it seemed like an obvious first choice, but there might well be some other materials more appropriate for the job.

Hi,

the thermal mismatch is a severe problem if you go up to 600°C.

You have a mismatch of 7ppm/K to steel and 12ppm/K to austenitic steels.

With the 30mm size this translates to (30*10^-6 x 7/2 *600) mm = 60 µm x and y growth on all the 4 edges.

To convert this elongation to an allowed stress or strain you will need a thickness of more than 10mm of a matching (in TCE) ceramic glue (TCE in-between steel and corundum).

This will only work if you dissect the area of the plate into many nearly cubic parts with trenches in-between to allow for some strain.

Or you make a design like the pins in todays processors like nails. But in your situation like nails with heads on both sides. The heads attached to the two different bodies, the shafts bending to accommodate the strain. (Ceramic nails!)

May be one bigger nail of this type is sufficient, avoid any notches.

Or you switch to stabilised zirconia that is much better matching steel in TCE.

Do you have in mind that these ceramics start to be conductive at higher temperatures?

RHABE

You might consider putting a taper on the edges of the ceramic and spot welding matching strips of steel to the steel plate. This will confine the ceramic and provide space for differential expansion.

clear rure silicone caulk bead

If it is low temperature application less than 75 oC you can use Custom Nano Materials adhesive paste and that will take care.

If this is high temperature application then Corborundum has high temperature adhesive which is stable up to 1250 oC.

I am not sure what your application is based on your need I will provide you the telephone number and other information