If brazing of alumina is done in a vaccum furnace at 600oC i.e the furnace temperature is kept constant at that particular temperature then while calculating the residual stress will thermal conductivity play a significant role or it can be ignored?
Thermal expansion mismatch between alumina and metallic interlayer (if used) causes stresses and it is better not to ignore it.
dear madam
residual stresses will be present can not be ignored in my opinion
a suitable metal is joined matching the thermal expansion all those are taken care of. the only problem that matters now shall thermal conductivity bother me much
Dear Srishti, In my opinion, thermal conductivity is a temperature dependent property and in your statement you mentioned about an isothrermal condition during brazing. If it is an isothermal condition then the conductivity of the alumina will remain constant and that should not interfere in the residual stress calculation; thus it can be ignored. However, residual stress of a joint also depend upon the athermal material characteristics and should consider seriously.
thank you sir that i know of. but i was confused about , the thermal conductivity.
What's the confusion? In an Isothemal condition thermal conductivity of a particular material remains constant and it should not have much effect on the residual stress development. It's simple.
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