Abstract
In this work are determined the thermophysical parameters (coefficient of thermal conductivity, thermal diffusivity and heat capacity) of a coating formed by the microarc oxidation (MAO) method on an aluminum alloy AK12D. A method for determining the thermal properties of the MAO layers was developed and verified. The technique is based on measuring the thermal conductivity of the layer by pulsed laser heating and calculating its heat capacity and density based on the data of layer-by-layer phase analysis taking into account the volume porosity. The method allows to calculate the thermophysical parameters whose values differ from the experimental no more than 2.2% in thermal conductivity and no more than 7.0% for heat capacity. In accordance with the proposed method, it was found that the MAO layer on AK12D alloy has a low thermal conductivity of ~ 1.57 W/(m·K) at 100 °C.
Highlights
The technology of microarc oxidation (MAO) is becoming increasingly popular in industry at this time [1, 2]
These measurements were carried out using the stationary heat flux method, which does not make it possible to determine the thermal conductivity of the coating with high correctness
Comparing the density values obtained by calculation and experimentally, we can see that the average calculated value differs from the measured value by 2.3 % and is in the range of its error
Summary
The technology of microarc oxidation (MAO) is becoming increasingly popular in industry at this time [1, 2]. The investigation of the thermophysical properties of the MAO layers is a difficult methodical task, since these coatings are ceramics with an inhomogeneous and complex chemical composition Such coatings are characterized by high porosity and uneven thickness [2, 4]. A few papers present a description of studies of the thermal conductivity of the MAO layer formed on the deformable alloy 6082 in a silicate-alkaline electrolyte [5,6,7] There is a need for a method for determining the thermophysical properties of MAO layers with larger accuracy
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