A CASTING Pd-Co-Ag ALLOY WITH MAGNETICS

为了研制具有磁性的铸造合金，制备了三种二元合金：72wt%Au-Co、75wt%Au-Fe、40wt%Pd-Co。所有这些合金都可以通过气体/氧气火焰熔化。Pd-Co合金在固溶体中具有最均匀的组织和182.5 gf的吸力。在氯化钠溶液中也表现出最高的耐蚀性。将12.7μg/cm2的钴离子溶解到氯化钠溶液中。37℃，连续7天。似乎使用带有磁性的铸造合金有一些优点，但在氯化钠溶胶中没有检测到贵金属Au或Pd。以这些合金中的任何一种为原料，制备了六种含Co或Fe的贵金属合金，并研究了这些合金的熔化性能、力学性能、磁力和显微组织。由48wt%Pd、32wt%Co、14wt%Ag、3wt%Au、2wt%Zn和1wt%In组成的6号合金，熔化范围为1148~1192℃，硬度为197Hv，抗拉强度为318 MPa，延伸率为14%，吸力为415.0 gf，铸态组织均匀，无气孔。

To develop a casting alloy with magnetics, three kinds of binary alloy were prepared as high-carat precious alloy, 72wt%Au-Co, 75wt%Au-Fe, 4Owt%Pd-Co by weight percent. All of these alloys could be fused by gas/oxygen flame. The Pd-Co alloy has the most homogeneous structure in a solid solution and a 182.5 gf attractive force. It also showed the highest corrosion resistance in NaCl sol. and 12.7 μg of Co ion/cm^2 was dissolved into the NaCl sol. at 37℃ for 7 days. It seems that there are some advantages in using a casting alloy with magnetics, but there were no precious metals, Au or Pd, detected in NaCl sol. from any of these alloys.Six kinds of precious metal alloys with Co or Fe were prepared and the melting properties, mechanical properties, magnetic forces and microstructures of these alloys were investigated. An experimental alloy (No.6) consists of 48wt%Pd, 32wt%Co, 14wt%Ag, 3wt%Au, 2wt%Zn and 1wt% In showed a melting range of 1148-1192℃, hardness of 197 Hv, tensile strength of 318 Mpa, elongation of 14%, attractive force 415.0 gf and a homogeneous structure without porosity when cast.