- Boron Nitride Dispersed Nanocomposites with High Thermal Shock Resistance
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T. Kusunose, T. Sekino, Y.H. Choa, T. Nakayama, K. Niihara
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J Korean Powder Metall Inst. 2001;8(3):174-178.
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 Abstract
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- The microstructure and mechanical properties of Si_3N_4/BN nanocomposites synthesized by chemical processing were investigated. The nanocomposites containing 15 vol% hexagonal BN (h-BN) were fabricated by hot-pressing alpha-Si_3N_4powders covered with turbostratic BN (t-BN). The t-BN coating on alpha-Si_3N_4particles was prepared by heating alpha-Si_3N_4 particles covered with a mixture of boric acid and urea in hydrogen gas. TEM observations of this nanocomposite revealed that nano-sized h-BN particles were homogeneously dispersed within Si_3N_4grains as well as at grain boundaries. The strength and thermal shock resistance were significantly improved in comparison with the Si_3N_4/BN microcomposites.
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