DENTAL APPLICATION OF THE 30NI-30CU-40MN TERNARY ALLOY SYSTEM

Experimental nickel-based alloys for dental application were made on the basis of the measurement of dissolved oxygen in the liquid state of the alloys. The improved Ni-Cu-Mn-based alloys were examined for hardness, microstructures an dimensional change. The alloys had a low concentration of dissolved oxygen, and each experimental Ni-Cu-Mn-based alloy containing a single additive element (either aluminium or tin) and complex additive elements (aluminium and tin, aluminium and indium, and aluminium, indium and tin) was constituted mainly by dendrite structure, but the aluminium, indium and tin-containing ones had a smaller amount of dendrite structure than the others, representing a fineness of dendrite structures. In addition, the metal crowns of the improved Ni-Cu-Mn-based alloys showed a better fit than that of the original Ni-Cu-Mn ternary alloy.