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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10513769 B1

PDFFull Text
Date of Patent:
Dec. 24, 2019

Filed:

Nov. 03, 2014

Tantalum powder and process for preparing the same, and sintered anode prepared from the tantalum powder

Applicant:

Ningxia Orient Tantalum Industry Co., Ltd., Ningxia, CN;

Inventors:

Yuewei Cheng, Ningxia, CN;

Fukun Lin, Ningxia, CN;

Xueqing Zhang, Ningxia, CN;

Guoqing Luo, Ningxia, CN;

Haiyan Ma, Ningxia, CN;

Yinghui Ma, Ningxia, CN;

Yanjie Wang, Ningxia, CN;

Xuanyu Wang, Ningxia, CN;

Dongjie Zhang, Ningxia, CN;

Assignee:

NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD., Shizuishan, CN;

Attorney:

Pillsbury Winthrop Shaw Pitman LLp

Primary Examiner:

Jie Yang

Int. Cl.
CPC ...
C22F 1/18 (2006.01); B22F 9/20 (2006.01); B22F 1/00 (2006.01); H01G 9/052 (2006.01); B22F 3/10 (2006.01); B22F 5/00 (2006.01); B22F 9/24 (2006.01); C21D 3/02 (2006.01); H01G 9/00 (2006.01); H01G 9/042 (2006.01); H01G 9/04 (2006.01);
U.S. Cl.
CPC ...
C22F 1/18 (2013.01); B22F 1/0003 (2013.01); B22F 1/0014 (2013.01); B22F 3/10 (2013.01); B22F 5/00 (2013.01); B22F 9/20 (2013.01); B22F 9/24 (2013.01); C21D 3/02 (2013.01); H01G 9/0029 (2013.01); H01G 9/042 (2013.01); H01G 9/0525 (2013.01); B22F 2009/245 (2013.01); B22F 2201/20 (2013.01); B22F 2301/20 (2013.01); B22F 2998/10 (2013.01); H01G 9/052 (2013.01); H01G 2009/05 (2013.01);
Abstract

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 m/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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