High Temperature Oxidation of AlB12–Al Composite Material

This article presents some results of thermal analysis of the AlB12-Al composite during isothermal heating for an hour at temperatures of 500, 600, 800, 900 and 1000C in air as well as under conditions of linear heating to 1000C at a heating rate of 5C/min.Composite samples are obtained by impregnating an AlB12 ceramic frame with molten Al in a vacuum.The phase composition of the oxidized surface is studied on a -3 diffractometer, and its elemental x-ray spectral analysis is studied on a JEOL JSM-6490 LV SEM equipped with an INKA Energy 350XT energy-dispersive spectrometer.The change in weight gain (16.3-406.3mg) depending on temperature and scale thickness (from 6.12 to 142 m) is studied.The phase composition is determined and the formation of aluminium borates in the whisker modification is shown.The kinetic characteristics of the oxidation process with a continuous rise in temperature at a constant rate are calculated: the activation energy