Description:
<jats:p>Fe/SiO<jats:sub>2</jats:sub>/shellac composites based on iron powder consisting of irregularly and/or spherical shaped particles coated with SiO<jats:sub>2</jats:sub> layer or with admixed SiO<jats:sub>2</jats:sub> powder were prepared either by mixing the Fe-SiO<jats:sub>2</jats:sub> powder with shellac or by vacuum/pressure impregnation (VPI) of sintered Fe-SiO<jats:sub>2</jats:sub> compacts with shellac dissolved in ethanol. The effect of iron particle shape, density of compacts and method of shellac application on electrical resistivity and magnetic coercivity was evaluated and correlated with microstructure and features of insulating layer. For VPI composites based on spherical particles a uniformly thick insulating layer was created. This resulted in the electrical resistivity and coercivity of 780-1120 μΩ.m and 177-290 A/m. For composites based on irregularly shaped particles the shellac admixing is more preferable.</jats:p>