Abstract
The mechanical properties of 5 cobalt base alloys for porcelain fused to metal and the strength of their solder joints have been determined. The variation in the composition of these alloys is reflected in their mechanical properties. The ranges of the mechanical properties of the materials tested were: (1) ultimate tensile strength — from 647 to 889.5 MPa; (2) yield strength — from 446.4 to 641.4 MPa; (3) modulus of elasticity — from 168.9 to 252.8×10
3 MPa; (4) elongation — from 2 to 10%; and (5) hardness — from 350 to 440 VHN. Heat treatment did not have any significant effect on any of the mechanical properties except elongation which showed some variation. In general, stronger joints were made by soldering with a torch than by oven soldering. Also, presoldered joints were stronger than postsoldered ones. So, presoldering with a torch produced the strongest joints.