氮化铝粉末的生产工艺研讨.doc

文献检索的作业 实习：专利文献检索 实习目的：了解专利文献检索的方法 实习要求：能用多种途径进行专利文献检索 实习设备：计算机 实习内容： 1、氮化铝粉末的生产工艺（国外专题数据库） （1）、Rare earth-activated aluminum nitride powders and method of making Inventors BING HAN US JONATHAN TAP US MADIS RAUKAS US Applicants OSRAM SYLVANIA INC US Priority US 763689 P??31-Jan-2006 Classifications International (2006.01): C04B 35/00 European: C04B 35/581; C01B 21/072; C09K 11/08J; C09K 11/77D; C09K 11/77N6; C09K 11/77P6; C09K 11/77T6 Abstract Rare earth-activated aluminum nitride powders are made using a solution-based approach to form a mixed hydroxide of aluminum and a rare earth metal, the mixed hydroxide is then converted into an ammonium metal fluoride, preferably a rare earth-substituted ammonium aluminum hexafluoride ((NH4)3Al1-xRExF6), and finally the rare earth-activated aluminum nitride is formed by ammonolysis of the ammonium metal fluoride at a high temperature. The use of a fluoride precursor in this process avoids sources of oxygen during the final ammonolysis step which is a major source of defects in the powder synthesis of nitrides. Also, because the aluminum nitride is formed from a mixed hydroxide co-precipitate, the distribution of the dopants in the powder is substantially homogeneous in each particle. （2）、Aluminum nitride sintered body and method of producing the same 公开号 US5482905 申请号 US/08/178642 申请人 SUMITOMO ELECTRIC INDUSTRIES LTD 发明人 AMATSUURA TAKAHIRO SOGABE KOUICHI YAMAKAWA AKIRA HATA SEIJIMATSUURA TAKAHIROSOGABE KOUICHIYAMAKAWA AKIRA 申请日期 1994-01-05 授权日期 1996-01-09 国际分类 C04B35/58?? 美国专利分类 501/98.4?? 代理人 Bierman; Jordan B.Bierman and Muserlianman; Jordan B.Bierman and Muserlian An aluminum nitride sintered body comprising aluminum nitride crystals belonging to a Wurtzite hexagonal crystal system wherein the 3 axes a, b and c of the unit lattice of the crystal are defined such that the ratio b/a of the lengths of the axes b and a is 1.000 near the center of the crystal grain and lies within the range 0.