[Study of nickel-chromium alloys containing titanium for porcelain bonding (author's transl)].

In order to analyze the effects of titanium and chromium and to determine the best composition of nickel-chromium alloys containing titanium for porcelain bonding, the mechanical properties, the tarnish resistance, and the porcelain bond strength of each of sixteen experimental alloys which were composed of nickel (54 to 90 wt%), chromium (10 to 40 wt%), titanium (0 to 6 wt%) were studied. The values of tensile strength, proportional limit, and Vickers hardness number for the alloys ranged from 33.4 to 68.1 kgf/mm2, 9.2 to 67.6 kgf/mm2, and 109 to 504 respectively. The increasing amount of titanium and/or chromium tended to the increase of those values. The elongation was higher than 24% for the alloys containing no titanium, but decreased to 0.3% with the increase of titanium and/or chromium content. The tarnish resistance for the alloys which contained only 10% chromium was not good. The porcelain bond strength of the alloys increased very significantly as the titanium content and/or the chromium content increased. In this study, the compositions of 58 to 76% Ni - 20 to 40%Cr - 2 to 4%Ti were considered to be optimum for porcelain bonding.