Abstract
Alumina powders containing varying ratios of B₄C were mixed in a V-type mixer for 30 min with 35 cycle/min to obtain a homogeneous mixture. Six different chemical compositions were prepared and sintered at 1600 °C for 20 min using an Ultra-High-Frequency Induction Heated System. The samples were cooled by air. The density, surface roughness, hardness and microstructure of samples were investigated. The results showed that when the amount of B₄C increased, the values of hardness increased and the values of surface roughness decreased.

Key words
alumina, boron carbide, sintering, induction, composite

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