Device and method for non-destructive test of three-dimensional anisotropic thermal conductivity of materials

Abstract

The invention provides a device and a method for a non-destructive test of the three-dimensional anisotropic thermal conductivity of materials, belonging to the technical field of material thermal conductivity tests. The device comprises a third-harmonic method independent sensor and an electric signal acquisition and processing module, wherein the third-harmonic independent sensor comprises wear-resistant insulating protective films, linear heating detector modules, current lead pieces and detecting voltage lead pieces; the current lead pieces and the voltage lead pieces are respectively soldered on the four bonding pads at the tail ends of linear heating detectors, and the wear-resistant insulating protective films covers the two sides of a micro linear heating detector; the electric signal acquisition and processing module comprises a signal generator, a microcomputer control and data acquisition system, a bridge module circuit, a lock-in amplifier, a high-precision direct current (DC) power supply, a resistor, a current lead terminal and a voltage lead terminal, and is used for amplifying electric signals generated by the sensor. The device has the advantages of being capable of realizing high-accuracy measurement of the three-dimensional anisotropic thermal conductivity of the materials, and being non-destructive in material test and high in reusability.

Description

technical field [0001] The invention relates to the technical field of material thermal conductivity testing, in particular to a non-destructive testing device and method for three-dimensional anisotropic thermal conductivity of materials. Background technique [0002] The heat transport properties of anisotropic materials are closely related to their orientation direction. The reason is that in different directions along the crystal lattice, the atomic arrangement period and density are quite different, resulting in different thermophysical properties such as thermal conductivity and thermal diffusivity in different directions. Anisotropic materials are widely used in high-tech fields such as microelectronic machinery, and human tissues also have anisotropy due to their different lateral and tangential growth characteristics. Therefore, the accurate and non-destructive measurement of thermal conductivity of anisotropic materials plays an important application value in the ...

AI Technical Summary

Problems solved by technology

However, the thermal properties of each orientation of the array material are different, coupled with its micro-nano-scale structural characteristics, it is very difficult to accurately measure its thermal conductivity

[0003] The existing technology (ZL 201010201486.7) uses harmonic detection technology to measure the thermal conductivity of anisotropic materials, but this method requires a coating operation on the surface of the sample to make the measurement process cumbersome, and the damage to the sample is large, which is not up to the existing Product needs for non-destructive and convenient measurement technology

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