Abstract
AbstractFlexible synthesis of ultra‐fine ZrB2 powders was achieved by borothermal reduction in a mixture of ZrO2, boron, and TiO2. Without TiO2 additive, coarse ZrB2 powders with particle size of 0.81 μm were obtained, presumably due to good wettability and solubility of ZrB2 in the byproduct B2O3. It was found that the particle growth of ZrB2 was effectively inhibited by the solid solution of TiB2 (≥1 mol%). The refinement mechanism was that the solid solution of in situ formed TiB2 presumably lowered the wettability and solubility of ZrB2 in the B2O3 liquid and significantly inhibited the coarsening of ZrB2. The average particle size of resulting powders decreased to 0.37 μm with the addition of 10 mol% TiO2.
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