Alumina has been identified as a most promising material in tritium permeation barrier. By introducing some additive into the alumina improves its effectiveness. The purpose of this study was to synthesize Al2O3 coated SiC particles by heterogeneous precipitation method to replace the pure alumina as the raw material of coating. A series of factors which influenced the properties of coated powders had been studied, including the concentration of Al(NO3)3 solution, surface active reagent, the addition amount of SiC, calcinations temperature etc. The coated powders were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Zeta-potential analyzer. The result indicates that the addition of certain amount of nano powers can reduce the phase transformation temperature of the alpha alumina. α-Al2O3 coated SiC powders were obtained by calcining Al(OH)3/SiC precursor at 1100 degree centigrade.

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