Preparation of mullite-alumina composite by reaction sintering between Algerian kaolin and amorphous aluminum hydroxide

The objective of this work is to obtain a multifunctional ceramic composite material at low cost with improved properties and that can be used in many structural applications like: electrical, refractory support tribological elements. A mullite-alumina were prepared by using Algerian kaolin amorphous aluminum hydroxide as starting materials. Two mixtures varying the content 61.5% 50 wt %. an abundant has been chosen high alumina trihydrate lower temperature reaction excess silica kaolin. advantage adding amount it reacts phase issue from increase mullite formed. When added excess, part will dispersed matrix form composite. results revealed major minor samples sintered 1600 °C. At firing temperature, no phases (SiO2) are detected. microstructure shows higher aspect ratio crystals. addition reduces size grains their ratio. density hardness resulting composites sintering content.