Abstract
Abstract The effect of ZrO 2 addition on the mechanical properties of B 4 C ceramics prepared by pressureless sintering was investigated. Submicron B 4 C powders, phenolic resin as binders and submicro-sized ZrO 2 as sintering aids were used. Results show that the addition of ZrO 2 improves the relative density and mechanical properties of B 4 C remarkably. The highest relative density was 96.7%, meanwhile bending strength and Vickers hardness of 365.4 MPa and 34.2 GPa, respectively were measured for specimens added with 15 wt% ZrO 2 and pressureless sintered at 2100 °C for 60 min.
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