A Method for Measuring the Resistivity of Metallic Iron under Ultra-High Voltage

Abstract

The invention discloses a method for measuring the resistivity of metal iron under ultra-high pressure, which includes: using a laser cutting machine to process high-purity iron sheets and rhenium sheets into circular samples and rectangular parts respectively; using the rhenium sheet as a heater, And assemble the circular iron piece, three tungsten wires and one tungsten-rhenium alloy wire in the ultra-high pressure test device; place the test assembly block in the six-sided top press, load it to the specified pressure and temperature, and test the sample The resistivity is measured and recorded using the four-probe van der Pauw principle; after heating and data recording, the pressure is unloaded; after the circular iron sample is taken out, it is fixed with epoxy resin, and then cut, ground and polished to form a circular Measure the thickness of the longitudinal section of the iron sheet, and calculate the resistivity value of the metal iron sheet under different temperature and pressure conditions by using the Vanderbilt measurement method formula; solve the problem of large temperature gradient and inaccurate temperature measurement in the prior art, and the measurement wires are in contact with each other , the problem of too many resistivity calculation parameters and large errors.

Description

technical field [0001] The invention belongs to the field of testing devices, in particular to a method for measuring the resistivity of metallic iron under ultra-high voltage. Background technique [0002] The resistivity of common metals, such as iron, nickel, copper, aluminum, etc. is very low, about ten to the negative eighth power and negative seven power ohms per meter. Accurately measuring the resistivity of these metals is particularly difficult. At atmospheric pressure, there are already many commercial metal resistivity measurement platforms and tools that are widely used in laboratories and industries. However, there is a lack of methods for measuring the resistivity of metals under ultra-high pressure and high temperature conditions. Because in the high-temperature and high-pressure generating device, the volume of the sample to be tested is limited, the arrangement of electrode wires is complicated, and it faces the risk of high failure rate under extreme temp...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide a method for measuring the resistivity of metallic iron under ultra-high pressure, so as to solve the problem that under ultra-high voltage conditions, the measurement results of resistivity of pure metal have large errors and large temperature gradients, making it impossible to test flakes. Samples and other technical issues

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