A high temperature prime surface heat exchanger is created using adjacent pairs
of plates having braze cladding on a first surface thereof that are formed to create
fluid flow passages for coolant and fluid flow passages for hot gas when assembled
into a core by stacking the plates. The coolant passages are adjacent the first
or clad surface of each formed plate to avoid direct contact with the high temperature
gas flowing in the hot gas passages. The adjacent plate pairs are joined by brazing
of a contacting portion of the first surface on each plate to form sealed coolant
passages the core.
