Co Alloys for Porcelain Fusing

Part 1: Co-Cr, Co-Ni and Co-Pd Binary Alloys

Abstract

　The properties of Co alloys (Co-Cr, Co-Ni, Co-Pd) for porcelain fusing were studied. Tensile strength, elongation, micro-Vickers hardness and thermal expansion were measured, and bonding strength between Co alloys and porcelain was studied.
　Tensile strengths of Co-Cr, Co-Ni and Co-Pd alloys were 164〜499 MPa, elongations 0.8〜18.7%, Vickers hardness numbers 91〜382. These values were similar to those of nonprecious alloys for porcelain fusing. Thermal expansions of Co-Cr, Co-Ni and Co-Pd alloys were the same as or slightly larger than those of porcelain fused alloys on the market. The maximum bonding strength was obtained with 70% Co-30% Pd alloy.