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包覆型BN-AIN复合粉体研究

Preparation of BN-Coated AIN Composite Powders

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【Author】 Zhang Juxian,Liang Long,Feng Jinjun(Vacuum Electronics National Laboratory,Beijing Vacuum Electronics Research Institute,Beijing 100016,China)(State Key Lab of New Ceramics and Fine Processing,Dept.of Materials Science and Engineering,Tsinghua University,Beijing 100084,China) give

【机构】中国电子科技集团公司第十二研究所大功率微波电真空器件技术国家级重点实验室；清华大学新型陶瓷与精细工艺国家重点实验室；中国电子科技集团公司第十二研究所；大功率微波电真空器件技术国家级重点实验室；北京100016；北京100084；

【摘要】利用包覆法,首先通过将AIN粉体均匀分散到硼酸(H38O3)和尿素(CO(NH2)2)的无水乙醇溶液中,制备出与硼酸和尿素均匀混合的AIN粉体。然后在氮气氛下,经过氮化处理来制备BN-AIN的复合粉体。DTA/TG分析显示,氮化反应从800℃开始,到1100℃时结束。XRD和TEM分析发现,复合粉体是由非晶态的BN均匀包覆AIN的复合颗粒组成。更多还原

【Abstract】 AIN-BN composite powders with the microstructure of micrometer-sized AlN particles coated with BN particles were prepared via a chemical reaction,which used a mixture of boric acid (H3BO3) and urea (CO(NH2)2) as reactants coated on the surface of the AIN particles to react in nitrogen ambient. DTA/TG analysis indicated that urea and boric decompose at 180-350℃ and generate ammonia gas (NH3) and boric oxide (B2O3),respectively. The two products react to form BN at 800-1100℃. The XRD and TEM studies showed that the coating layer (BN) was composed mostly of amorphous BN at the reaction temperature of 850-1100℃.更多还原

【关键词】 BN-AIN复合粉体；包覆型颗粒；氮化处理；
【Key words】 BN-AIN composite powders； coated particles； nitration reaction；

【文献出处】稀有金属材料与工程 ,Rare Metal Materials and Engineering , 编辑部邮箱 ,2007年S1期

【分类号】TM286
【被引频次】2
【下载频次】145

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