Invention Grant
- Patent Title: High specific capacitance capacitor-grade tantalum powder with improved electrical properties and process for making the same
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Application No.: US14767243Application Date: 2013-12-25
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Publication No.: US10074486B2Publication Date: 2018-09-11
- Inventor: Guoqi Yang , Aiguo Zheng , Xueqing Chen , Fukun Lin
- Applicant: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD. , NATIONAL ENGINEERING RESEARCH CENTER FOR SPECIAL METAL MATERIALS OF TANTALUM AND NIOBIUM
- Applicant Address: CN Shizuishan, Ningxia CN Shizuishan, Ningxia
- Assignee: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD.,NATIONAL ENGINEERING RESEARCH CENTER FOR SPECIAL METAL MATERIALS OF TANTALUM AND NIOBIUM
- Current Assignee: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD.,NATIONAL ENGINEERING RESEARCH CENTER FOR SPECIAL METAL MATERIALS OF TANTALUM AND NIOBIUM
- Current Assignee Address: CN Shizuishan, Ningxia CN Shizuishan, Ningxia
- Agency: Pillsbury Winthrop Shaw Pittman, LLP
- International Application: PCT/CN2013/090386 WO 20131225
- International Announcement: WO2015/096048 WO 20150702
- Main IPC: B32B15/02
- IPC: B32B15/02 ; H01G9/042 ; B22F9/04 ; H01G9/15 ; B22F1/00 ; H01G9/052 ; H01G9/04

Abstract:
A method for providing a tantalum powder with a piece+block structure, comprising the following steps: 1) providing a granulous tantalum powder, and dividing same into a first part and a second part; 2) putting the first part of the tantalum powder in a ball mill for ball milling, taking the powder out after the ball milling and sieving same, and obtaining a tantalum powder in the form of a piece; 3) mixing the tantalum powder in the form of a piece and the second part of the tantalum powder to obtain a mixture, and preferably, the mixing proportion of the tantalum powder in the form of a piece and the granulous tantalum powder being 1:0.1˜1, preferably being 1:0.25˜0.8, and more preferably being 1:0.4˜0.6; and 4) performing the steps of water washing, acid washing, and nodularization on the mixture to finally obtain a tantalum powder with a piece+block structure.
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