| 摘要 |
PURPOSE:To improve the welding resistance and consumption resistance of an Ag-Ni type electrical contact material while maintaining its stable contact resistance by uniformly dispersing specified oxide particles in the contact material. CONSTITUTION:A mixture of powdered Ag contg. 1-30wt% finely powdered Ni is mixed with 0.05-5wt% fine powder of at least one kind of oxide such as SnO2, CdO, NiO, Bi2O3 or Sb2O3. At this time, the volume of fine particles of Ni and SnO2 or other oxide is adjusted to <=150mum<3>. The Ag-base powdered mixture is repeatedly subjected to sintering at 900 deg.C and compression in a neutral or reducing atmosphere. The sintered body is extruded into a wire rod with an extruder, and the wire rod is drawn to about 2.4mm. diameter with a drawer. The resulting wire rod is cut to a suitable length and formed into a rivet to manufacture an electrical contact material having superior characteristics. |
