Preparation of Highly Pure Nano-sized t-BN Coating Al2O3 and ZrO2 Composite Powders by a Low-temperature Chemical Reaction

Abstract

Abstract: Al₂O₃ and m-ZrO₂ powders with nanometers turbostratic-BN(t-BN) coating were prepared through chemical reaction in nitrogen with boric acid and urea as B source and N source, respectively. t-BN was obtained at 650 ℃ and turned into h-BN by heating the nanocomposite powder at 1 600 ℃ in argon. After being calcined in air at 450 ℃ for 5 h, the semi-finished compounds containing CH₂ and CN groups in the reaction products decomposed and the powders were purified. The yield of BN in the composite powders is more than 99%.

Key words: Chemical reaction, Nano-coating, Alumina, Zirconia, Boron nitride

CLC Number:

TQ174

TrendMD:

LI Yong-Li, QIAO Guan-Jun, JIN Zhi-Hao . Preparation of Highly Pure Nano-sized t-BN Coating Al₂O₃ and ZrO₂ Composite Powders by a Low-temperature Chemical Reaction[J]. Chem. J. Chinese Universities, 2003, 24(7): 1154.

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Preparation of Highly Pure Nano-sized t-BN Coating Al₂O₃ and ZrO₂ Composite Powders by a Low-temperature Chemical Reaction

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