Abstract
The nitridation of an AlB2 precursor in a controlled nitrogen flow is examined with the aim of obtaining AlN–BN composite powders. It is shown that superfine powders with uniformly distributed AlN and BN phases and AlB12 admixture form over the temperature range 1000–1400°C. The powders do not require further grinding. The morphology and particle size of the powders and the microstructure and properties of hot-pressed samples are studied. The developed material exhibits better mechanical properties (as compared with known ABN composites): in particular, Rbm = 235 MPa and HV = 14.2 ± 1.3 GPa. The high bending strength and hardness are due to the finegrained structure of the samples and the strengthening effect of superfine (≤1 μm) inclusions of aluminum dodecaboride.
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