Simple measurement device for heat conductivity coefficient of porous ceramics

Abstract

The invention relates to a simple measurement device for the heat conductivity coefficient of porous ceramics. The device comprises a heater arranged at the bottom, wherein the top of the heater is provided with a heat source, the top of the heat source is provided with an upper sheet copper and a lower sheet copper which correspond to each other up and down, the lower sheet copper is directly contacted with the heat source to be taken as a hot end, and the upper sheet copper is taken as a cold end; when the heat conductivity coefficient is measured, the porous ceramics to be measured is arranged between the upper sheet copper and the lower sheet copper; the upper sheet copper and the lower sheet copper are respectively connected with a thermoelectric couple; and a heat preservation cover is packed on the upper sheet copper, the porous ceramics to be measured and the lower sheet copper, and the top of the outer side of the heat preservation cover is provided with a counter weight block. The simple measurement device is used for computing the heat conductivity coefficient by adopting the Fourier heat transfer law, and is simple in structure; parts used for building the device, i.e. the heater, the heat source, the sheet coppers, the thermoelectric couples and the like, are not expensive, so that the simple measurement device is low in cost; and the experimental the number of operation steps for measuring the heat conductivity coefficient by using the device is small, and compared with the measurement by using a steady-state method which needs a plurality of hours for once, the measurement by using the device commonly needs 10-20min for once.

Description

technical field [0001] The invention belongs to the technical field of thermal conductivity measurement, in particular to a measuring device for the thermal conductivity of porous ceramics. Background technique [0002] Porous ceramics are widely used in the preparation of filter membranes, catalyst supports, burners and insulation materials due to their excellent properties such as low thermal conductivity, low density, high porosity, high temperature resistance and corrosion resistance. Among them, the thermal conductivity is an important physical parameter of porous ceramics, and it is an indispensable basic data for evaluating the performance of porous ceramics. At present, the thermal conductivity of porous ceramics is mainly obtained through experimental measurement, which can be roughly divided into steady-state method and unsteady-state method according to the measurement principle. The steady-state measurement method has a simple principle and can obtain thermal co...

AI Technical Summary

Problems solved by technology

[0003] There are many ways to form porous ceramics. When molding or injection molding is used, the size of the final sample is limited by the size of the mold, so many common thermal conductivity testing instruments are not suitable, and some precision measurement instruments that can measure The instrument is expensive, and the cost of a measurement is relatively high, so it is necessary to build a simple experimental device that can quickly prepare and measure the thermal conductivity of porous ceramics

Images