低温反应制备高纯度纳米BN包覆Al_2O_3和ZrO_2粉体  

Preparation of Highly Pure Nano-sized t-BN Coating Al_2O_3 and ZrO_2 Composite Powders by a Low-temperature Chemical Reaction

作　　者：李永利[1] 乔冠军[1] 金志浩[1] 

机构地区：[1]西安交通大学材料强度国家重点实验室,西安710049

出　　处：《高等学校化学学报》2003年第7期1154-1157,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :5 0 0 72 0 17)资助

摘　　要：硼酸和尿素在氮气中于 6 5 0℃反应 ,生成 t-BN-Al2 O3 和 t-BN-Zr O2 纳米包覆粉 .IR分析表明 ,反应产物中含 CH2 和 CN基团的杂质属尿素缩聚的复杂产物 ,经 4 5 0℃煅烧即可除去 .硼酸和尿素完全反应 ,得到纯净的纳米复合粉体 .BN产率大于 99% ,在复合粉中的含量与计算值吻合 .Al 2O 3 and m-ZrO 2 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 CH 2 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%.

关 键 词：低温反应 制备 纳米包覆 AL2O3 ZRO2 BN粉体 六方氮化硼 陶瓷加工 

分 类 号：TQ174.4[化学工程—陶瓷工业]