Measuring method for thermal conductivity of metal at high temperature

Abstract

The invention provides a measuring method for thermal conductivity of metal at high temperature. The measuring method comprises the following steps: acquiring thermal diffusion coefficients of a metal sample at different temperatures, wherein the temperatures refer to temperatures except the oxidizing temperature of the metal sample; acquiring thermal conductivity at a corresponding temperature according to the thermal diffusion coefficients and the density and specific heat capacity of the metal sample; acquiring a plurality of groups of initialization fitting regression equation of the temperatures and thermal conductivity according to each group of temperature and thermal conductivity data; subjecting each group of initialization fitting regression equation to test of goodness of fit according to the temperatures and thermal conductivity and establishing a fitting regression model of the temperatures and thermal conductivity; and determining thermal conductivity at different high temperatures according to the fitting regression model. With the method provided by the invention, thermal conductivity of metal at high temperature can be obtained, and accuracy of the obtained thermal conductivity is high.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a method for measuring high-temperature thermal conductivity of metals. Background technique [0002] In traditional technology, reliability studies such as thermal performance and vibration characteristics of products are often evaluated through test measurements. With the development of computer technology, simulation technology is widely used in the reliability research of products in the thermal state, which can greatly reduce costs and improve efficiency. Therefore, it is very important to study the changes of physical properties of metal materials at high temperatures. Obtaining specific data of physical properties at high temperatures is the basis for accurate evaluation of thermal and mechanical reliability of products. Among them, thermal conductivity (also known as thermal conductivity) is an important parameter to characterize the thermal conductivity of material...

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Problems solved by technology

[0007] Based on this, it is necessary to provide a high-temperature thermal conductivity measurement method for metals to solve the problem that the accuracy of thermal conductivity measurement is not high because metals are easily oxidized at high temperatures.

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