公开(公告)号：WO2014077176A3

公开(公告)日：2014-07-10

申请号：PCT/JP2013080078

申请日：2013-11-07

Applicant: KANTO DENKA KOGYO KK

Inventor： IINUMA HIDEHIKO ,  MORIYA YOSHIMI

IPC: C01G23/00

CPC classification number: H01G4/1227 ,  C01G23/006 ,  C01P2002/77 ,  C01P2004/04 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/84 ,  C01P2006/12 ,  C04B35/4682 ,  C04B35/62805 ,  C04B35/6281 ,  C04B35/62818 ,  C04B35/62886 ,  C04B35/62894 ,  C04B2235/3201 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3227 ,  C04B2235/3229 ,  C04B2235/3262 ,  C04B2235/442 ,  C04B2235/443 ,  C04B2235/5409 ,  C04B2235/5445 ,  C04B2235/5454 ,  C04B2235/79 ,  C04B2235/80

Abstract: Provided is a surface-coated barium titanate particulate for use in multilayer ceramic capacitors and for which the grain growth during high-temperature firing has been suppressed. Also provided is a production method for same. Barium titanate particulate obtained by means of a hydrothermal reaction, wherein the coated barium titanate particulate has an average particle diameter of at least 10nm but less than 1000nm, a Ba/Ti ratio of 0.80-1.20 inclusive, a c/a ratio of 1.001-1.010 inclusive, and a coating layer comprising a compound of Mg, Ca, Ba, and Mn and at least one kind of metal selected from the group consisting of rare earth elements is included on the surface thereof. The coated barium titanate particulate according to the present invention is produced by means of a method including: (1) a step for obtaining barium titanate particulate by mixing an aqueous solution containing barium hydroxide and an aqueous solution containing titanium hydroxide at a Ba/Ti ratio of 0.80-1.20 inclusive, and subjecting same to a hydrothermal reaction at a temperature of 200-450°C inclusive, a pressure of 2.0-50MPa inclusive, and for a reaction time of 0.1 minutes-1 hour inclusive; (2) a step for uniformly dispersing the barium titanate particulate in an aqueous solution; and (3) a step for coating the metal compound on the surface of the barium titanate particulate.

Abstract translation: 提供一种用于多层陶瓷电容器的表面涂覆的钛酸钡颗粒，并且其中高温烧制期间的晶粒生长被抑制。 还提供了相同的制造方法。 通过水热反应获得的钛酸钡颗粒，其中涂覆的钛酸钡颗粒的平均粒径为至少10nm但小于1000nm，Ba / Ti比为0.80-1.20（含），ac / a比为1.001-1.010 并且包括Mg，Ca，Ba和Mn化合物的涂层以及选自稀土元素中的至少一种金属的表面。 根据本发明的涂覆的钛酸钡颗粒通过以下方法制备：（1）通过将含有氢氧化钡的水溶液和含有氢氧化钛的水溶液以Ba / Ti比混合来获得钛酸钡颗粒的步骤 为0.80-1.20，并在200-450℃的温度下进行水热反应，其压力为2.0-50MPa，反应时间为0.1分钟-1小时。 （2）将钛酸钡颗粒均匀分散在水溶液中的步骤; 和（3）在钛酸钡颗粒的表面上涂覆金属化合物的步骤。