Calculation method of thermal conductivity of refractory materials

Abstract

The invention discloses a calculation method of thermal conductivity coefficient of a refractory material. The calculation method comprises the following steps: grinding the refractory material to obtain a refractory material sample with small particle size; a liquid is added into the refractory material with small particle size, and the liquid and the refractory material are mixed uniformly; the uniformly-mixed refractory material with small particle size is made into a disk-like sample; the disk-like sample is put into a drying oven and dried; mass, thickness and density of the disk-like sample are measured and recorded; colloidal graphite is uniformly sprayed onto the surface of the disk-like sample; the disk-like sample is put into a sample carrier room of a thermal conductivity coefficient measuring apparatus; the sample carrier room is vacuumized or an inert gas is introduced into the sample carrier room; the disk-like sample in the sample carrier room is heated to a target temperature; the thermal conductivity coefficient measuring apparatus emits laser pulse, and thermal diffusion coefficient alpha and specific heat capacity Cp of the disk-like sample are recorded; and thermal conductivity coefficient of the refractory material is calculated according to the above data. According to the invention, thermal conductivity coefficient of the refractory material can be accurately obtained.

Description

technical field [0001] The invention relates to the determination of refractory material parameters, in particular to a calculation method for refractory material thermal conductivity. Background technique [0002] Thermal conductivity is a very important physical quantity in the heat transfer calculation of materials. It is not only an important basis for evaluating whether materials are suitable for specific heat transfer processes, but also a main parameter for thermal design of engineering equipment. For the measurement of the thermal conductivity of materials, there are mainly several technical methods such as hot wire method, laser flash method, and flat plate method. Among them, the laser flash method has been developed rapidly due to the advantages of short measurement time, high accuracy and wide range of applicable materials. It has been recognized and respected in the field of thermal conductivity research in the world. [0003] The national standard "GB / T 22588-...

AI Technical Summary

Problems solved by technology

For inhomogeneous and anisotropic composite materials, such as refractory materials, the measured data will have large errors

As a result, refractory materials cannot be tested according to standard methods, and the test results have no comparability and reference value, which brings troubles to the design and construction of high-temperature industrial kilns

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