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公开(公告)号：US20210060654A1
公开(公告)日：2021-03-04
申请号：US16958150
申请日：2017-12-27
发明人： Haiyan MA , Hui LI , Guoqing LUO , Yuewei CHENG , Chunxia ZHAO , Xueqing CHEN , Zhidao WANG , Fukun LIN , Guoqi YANG , Ning WANG , Yinghui MA , Yanjie WANG , Lijun LI , Honggang ZHANG
摘要： A tantalum powder, a tantalum powder compact, a tantalum powder sintered body, a tantalum anode, an electrolytic capacitor and a preparation method for tantalum powder. The tantalum powder contains boron element, and the tantalum powder has a specific surface area of greater than or equal to 4 m2/g; the ratio of the boron content of the tantalum powder to the specific surface area of the tantalum powder is 2˜16; the boron content is measured in weight ppm, and the specific surface area is measured in m2/g; Powder that can pass through a ρ-mesh screen in the tantalum powder accounts for over 85% of the total weight of the tantalum powder, where ρ=150˜170; and the tantalum powder with high CV has a low leakage current and dielectric loss, and good moldability.
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2.发明申请公开(公告)号：US20170226616A1
公开(公告)日：2017-08-10
申请号：US15125803
申请日：2014-11-03
发明人： Yuewei CHENG , Fukun LIN , Xueqing ZHANG , Guoqing LUO , Haiyan MA , Yinghui MA , Yanjie WANG , Xuanyu WANG , Dongjie ZHANG
IPC分类号： C22F1/18 , B22F9/24 , B22F3/10 , H01G9/052 , C21D3/02 , H01G9/042 , H01G9/00 , B22F1/00 , B22F5/00
摘要： The invention relates to the rare metal smelting field, and particularly, the present invention relates to a tantalum powder for preparing capacitors and a process for preparing the tantalum powder, and to a sintered anode prepared from the tantalum powder. As to the tantalum powder as provided by the invention, its primary tantalum powder has a BET of from 3.0 to 4.5 m2/g. After the secondary agglomeration, the tantalum powder has a large particle size. The tantalum powder has an average Fisher sub-sieve size (FSSS) of 1.2 to 3.0 μm wherein as measured with a standard sieve mesh, more than 75% of tantalum powder has a +325-mesh, and a particle size distribution D50 of more than 60 μm, that is, the secondary particle size is high. A resultant capacitor anode prepared by sintering the tantalum powder of the invention at 1200° C. for 20 minutes and then being energized at the voltage of 20 V has the specific capacitance of from 140,000 to 180,000 μFV/g and the residual current of less than 1.0 nA/μFV. Meantime, the invention provides an economical process for making the tantalum powder.
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