Study on in-situ synthesis of ZrB2 whiskers in ZrB2–ZrC matrix powder for ceramic cutting tools
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Abstract
Abstract The composite powder of ZrB 2 whisker-toughened ZrB 2 –ZrC matrix ceramic tool materials was synthesized by in-situ synthesis process combined with the carbothermal reduction method. The product contained ZrB 2 as the major phase and ZrC/Ni 2 B as the minor phases. When increasing the synthesis temperature from 1400 °C to 1700 °C, the lattice parameters of ZrB 2 ( a and c ) decreased linearly, meanwhile, ZrC exhibited a non-stoichiometric property through the variation of the lattice parameter. The ZrB 2 whiskers showed an aspect ratio of 10–30 and a diameter of 1–3 μm. The agglomeration of the ZrB 2 –ZrC matrix powder and the morphology of bonding particles in the whiskers were also observed. The solid–liquid–solid (S–L–S) mechanism and the anisotropic Ostwald ripening were found to govern the growth of the ZrB 2 whiskers during the in-situ synthesis process.
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