公开(公告)号：US06592645B1

公开(公告)日：2003-07-15

申请号：US09889490

申请日：2001-07-18

申请人： Hideto Mizutani ,  Minoru Yoneda ,  Toshihiro Sugaya ,  Hiroyoshi Urasumi ,  Chiyo Honda ,  Hiroshi Nakao ,  Tsutomu Hatanaka ,  Shinji Ohgama ,  Kiyoshi Fukai ,  Kazuhiko Nagano ,  Shigefumi Kamisaka ,  Kazunobu Abe

发明人： Hideto Mizutani ,  Minoru Yoneda ,  Toshihiro Sugaya ,  Hiroyoshi Urasumi ,  Chiyo Honda ,  Hiroshi Nakao ,  Tsutomu Hatanaka ,  Shinji Ohgama ,  Kiyoshi Fukai ,  Kazuhiko Nagano ,  Shigefumi Kamisaka ,  Kazunobu Abe

IPC分类号： B22F918

CPC分类号： H01G4/008 ,  B22F9/22 ,  B22F2998/10 ,  B22F2999/00 ,  B22F9/026

摘要： A process for the production of fine powder of metallic nickel which comprises a first step of dissolving nickel carbonate and/or nickel hydroxide in aqueous ammonia or in an aqueous solution of ammonia and at least one selected from the group consisting of ammonium carbonate, ammonium hydrogencarbonate, a carbonate of an alkali metal and a hydrogencarbonate of an alkali metal to prepare an aqueous solution of a nickel salt; converting the aqueous solution of a nickel salt to a W/O emulsion, and then removing volatile components including ammonia from the droplets to form precipitates of nickel carbonate in the droplets, thereby providing fine spherical particles of nickel carbonate; and a second step of heating the particles of nickel carbonate in the presence of a fusion preventive agent that is a compound of at least one element selected from the group consisting of alkaline earth elements, aluminum, silicon and rare earth elements in an atmosphere of hydrogen, thereby reducing the nickel carbonate to metallic nickel.

摘要翻译： 一种制造金属镍微细粉末的方法，该方法包括将碳酸镍和/或氢氧化镍溶解在氨水或氨水溶液中的至少一种和碳酸铵，碳酸氢铵 ，碱金属的碳酸盐和碱金属的碳酸氢盐以制备镍盐水溶液; 将镍盐水溶液转化成W / O乳液，然后从液滴中除去包括氨在内的挥发性成分，从而在液滴中形成碳酸镍的沉淀物，由此提供细小的碳酸镍球形颗粒; 在第二步骤中，在氢气气氛中，在选自碱土元素，铝，硅和稀土元素中的至少一种元素的化合物的熔融预防剂存在下，加热碳酸镍颗粒 ，从而将碳酸镍还原为金属镍。

公开(公告)号：US06402803B1

公开(公告)日：2002-06-11

申请号：US09140001

申请日：1998-08-26

申请人： Hideshi Katayama ,  Kan Saito ,  Shuetsu Ogasawara ,  Takao Hamada

发明人： Hideshi Katayama ,  Kan Saito ,  Shuetsu Ogasawara ,  Takao Hamada

IPC分类号： B22F918

CPC分类号： H01G4/0085 ,  B22F9/28 ,  B22F2001/0037 ,  B22F2998/00 ,  C22C1/0433 ,  H01L23/49883 ,  H01L2924/0002 ,  Y10T428/12014 ,  B22F1/0018 ,  B22F1/0048 ,  H01L2924/00

摘要： Provided is an ultrafine nickel powder suitable for a laminated ceramic capacitor electrode material. According to the ultrafine nickel powder, cracks and/or delamination are not liable to generate in the process for producing a ceramic capacitor, and its internal electrode can be made into a thinner layer, and the electric risistivity of the capacitor can be made low. The ultrafine nickel powder has an average particle size of 0.1-1.0 &mgr;m, having the sulfur content of 0.02-1.0% by weight, and particles thereof being spherical, thereby exhibiting excellent properties. They can be produced by vapor phase hydrogen-reducing process using nickel chloride vapor.

摘要翻译： 提供了适用于层叠陶瓷电容器电极材料的超细镍粉。 根据超细镍粉末，在制造陶瓷电容器的过程中不会产生裂纹和/或分层，并且其内部电极可以制成更薄的层，并且可以使电容器的电阻率较低。 超细镍粉的平均粒径为0.1〜1.0μm，硫含量为0.02〜1.0重量％，粒子为球形，表现出优异的性能。 它们可以通过使用氯化镍蒸气的气相氢还原法生产。