Evaluation of Pd-based brazes to join silicon nitride to copper-clad-molybdenum

摘要

Si_3N_4 (SN-281)/Cu-clad-Mo joints, brazed using a soft (YS: 341 MPa) and ductile (43 percent elongation) Pd-Co braze were sound and exhibited an interaction zone comprised of Pd_(66)Mo_(14)Cu_(10)Co_6Si_3 and Pd_(74)Mo_(11)Co_8Cu_6Si. Similar joints made using a less ductile and stronger Pd-Ni braze led to cracking from large CTE mismatch-induced strain energy (approx 64 mJ to 348 mJ).