Brazing Characteristics of Diamond on Various Substrates With Differient Brazing Alloys

Abstract

ABSTRACTThe commercial diamond grits and the diamond films deposited by a microwave plasma chemical vapor deposition system were used to study the wetting characteristics of few commercial brazing alloys, e.g., Cu, Ni, Ag-Cu-Zn-Cd-Ni and Ag-Cu-In. The substrates for brazing experiments include AISI-304 stainless steel, AISI-1045 steel and cemented WC insert. The results shows that the wettability of the brazing alloys and the bonding strength between diamond and substrate are strongly influenced by the compositions of the brazing alloys and the surface conditions of diamond and substrate. The wettability of Cu with diamond grit or diamond film depends on the brazing substrate, and is in order of AISI-304 > WC > AISI-1045. The brazing alloys with Cu or Ag as the main component often show a poor brazing strength for diamond/plain carbon steel or diamond/WC.