Patent ID: 9207258
Filing Date: 2015-12-08
Classification: G01R

Abstract:
1. An electrical probe comprising: a high yield strength wire core including predominantly one or more materials selected from the group consisting of tungsten, tungsten-copper alloy, tungsten-nickel alloy, beryllium-copper alloy, molybdenum, stainless steel, and combinations thereof, the high mechanical strength wire core having a yield strength of at least 1 gigapascal at a temperature of 250° C.; a low electrical resistivity layer concentrically around the high yield strength wire core, the concentric layer including predominantly one or more materials selected from the group consisting of silver, gold, copper, and combinations thereof, the low electrical resistivity layer having an electrical resistivity of no more than 2×10 a first thin isolation layer concentrically disposed between the high yield strength wire core and the low electrical resistivity layer, wherein the first thin isolation layer is disposed directly on the high yield strength wire core and includes predominantly one or more materials selected from the group consisting of nickel and cobalt and wherein the low electrical resistivity layer is disposed directly on the thin isolation layer; an outer cross-sectional dimension of the electrical probe that is no more than 50 micrometers (μm); between 60 to 85% of the outer cross-sectional dimension provided by the high mechanical strength wire core; and between 10 to 30% of the outer cross-sectional dimension provided by the low electrical resistivity layer.