A method for measuring resistivity of metal iron sheet under high temperature and high pressure

Abstract

The invention discloses a method for measuring the resistivity of metal iron sheets under high temperature and high pressure, which comprises: 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 put the round iron sheet and four high-purity tungsten wires into the high-temperature and high-pressure test device for assembly; place the test assembly block in the six-sided top press, load it to the specified pressure and temperature, and the resistivity of the sample The resistivity is measured and recorded using the four-probe van der Pauw principle, and the temperature is measured by a separate thermocouple; 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 Grind and polish the longitudinal section of the circular iron sheet, measure the thickness, and calculate the resistivity value of the metal iron sheet under different temperature and pressure conditions by using the Vanderbilt measurement formula; solve the problem of large temperature gradient and inaccurate temperature measurement in the prior art , the measurement wires are in contact with each other, too many resistivity calculation parameters, large errors and other technical problems.

Description

technical field [0001] The invention belongs to the field of testing devices, and in particular relates to a method for measuring the resistivity of metal iron sheets under high temperature and high pressure. Background technique [0002] Common metals, such as iron, nickel, copper, aluminum, etc., have very low resistivity, which are all about the minus eighth power of ten and minus seven power ohms / meter. It is particularly difficult to accurately measure the resistivity of these metals. At atmospheric pressure, there are many commercial metal resistivity measurement platforms and tools that are widely used in laboratory and industry. However, under high pressure and high temperature conditions, there is no way to measure the resistivity of metals. 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...

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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 metal iron sheet under high temperature and high pressure, so as to solve the problem that the resistivity measurement result of pure metal has large errors and large temperature gradients under high temperature and high pressure conditions, making it impossible to test the sheet metal. sample and other technical issues

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