Patents by Inventor Guoqi Yang
Guoqi Yang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11534830Abstract: 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 ?-mesh screen in the tantalum powder accounts for over 85% of the total weight of the tantalum powder, where ?=150˜170; and the tantalum powder with high CV has a low leakage current and dielectric loss, and good moldability.Type: GrantFiled: December 27, 2017Date of Patent: December 27, 2022Assignee: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTDInventors: 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
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Publication number: 20210060654Abstract: 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 ?-mesh screen in the tantalum powder accounts for over 85% of the total weight of the tantalum powder, where ?=150˜170; and the tantalum powder with high CV has a low leakage current and dielectric loss, and good moldability.Type: ApplicationFiled: December 27, 2017Publication date: March 4, 2021Applicant: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD.Inventors: 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
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Patent number: 10737322Abstract: The present invention relates to a composite tantalum powder and a process for preparing the same, and to a capacitor anode prepared from the tantalum powder. The method for preparing a composite tantalum powder comprises the following steps of: 1) providing a tantalum powder prepared by a reduction process, and flattening the tantalum powder so as to prepare a flaked tantalum powder; 2) providing a granular tantalum powder prepared from tantalum ingot; 3) mixing the flaked tantalum powder and the granular tantalum powder to give a tantalum powder mixture; and 4) thermally treating the tantalum powder mixture, and then pulverizing, screening to give a composite tantalum powder. The present invention further relates to a composite tantalum powder prepared from the process and the use thereof in a capacitor.Type: GrantFiled: August 20, 2014Date of Patent: August 11, 2020Assignees: Ningzia Orient Tanatum Industry Co., Ltd., National Engineering Research Center for Special Metal Materials of Tantalim and NiobiumInventors: Guoqi Yang, Aiguo Zheng, Yuezhong Ma
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Patent number: 10074486Abstract: 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.Type: GrantFiled: December 25, 2013Date of Patent: September 11, 2018Assignees: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD., NATIONAL ENGINEERING RESEARCH CENTER FOR SPECIAL METAL MATERIALS OF TANTALUM AND NIOBIUMInventors: Guoqi Yang, Aiguo Zheng, Xueqing Chen, Fukun Lin
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Patent number: 9764388Abstract: A method for preparing a tantalum power of capacitor grade, comprising: solid tantalum nitride is added when potassium fluotantalate is reduced by sodium. The method increases the nitrogen content in the tantalum powder, and at the same time improves the electrical performance of the tantalum powder. The specific capacitance is increased, and the leakage current and loss is improved. The qualification rate of the anode and the capacitor product is also improved. The method is characterized in that the nitrogen in the tantalum nitride diffuses between the particles of the tantalum powder, with substantially no loss, and thus the nitrogen content is accurate and controllable.Type: GrantFiled: December 10, 2013Date of Patent: September 19, 2017Assignees: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD., NATIONAL ENGINEERING RESEARCH CENTER FOR SPECIAL METAL MATERIALS OF TANTALUM AND NIOBIUMInventors: Guoqi Yang, Aiguo Zheng, Yuewei Cheng, Yuezhong Ma
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Publication number: 20170232509Abstract: The present invention relates to a composite tantalum powder and a process for preparing the same, and to a capacitor anode prepared from the tantalum powder. The method for preparing a composite tantalum powder comprises the following steps of: 1) providing a tantalum powder prepared by a reduction process, and flattening the tantalum powder so as to prepare a flaked tantalum powder; 2) providing a granular tantalum powder prepared from tantalum ingot; 3) mixing the flaked tantalum powder and the granular tantalum powder to give a tantalum powder mixture; and 4) thermally treating the tantalum powder mixture, and then pulverizing, screening to give a composite tantalum powder. The present invention further relates to a composite tantalum powder prepared from the process and the use thereof in a capacitor.Type: ApplicationFiled: August 20, 2014Publication date: August 17, 2017Inventors: GUOQI YANG, Aiguo ZHENG, Yuezhong MA
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Publication number: 20160314904Abstract: 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.Type: ApplicationFiled: December 25, 2013Publication date: October 27, 2016Inventors: Guoqi YANG, Aiguo ZHENG, Xueqing CHEN, Fukun LIN
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Publication number: 20160059319Abstract: A method for preparing a tantalum power of capacitor grade, comprising: solid tantalum nitride is added when potassium fluotantalate is reduced by sodium. The method increases the nitrogen content in the tantalum powder, and at the same time improves the electrical performance of the tantalum powder. The specific capacitance is increased, and the leakage current and loss is improved. The qualification rate of the anode and the capacitor product is also improved. The method is characterized in that the nitrogen in the tantalum nitride diffuses between the particles of the tantalum powder, with substantially no loss, and thus the nitrogen content is accurate and controllable.Type: ApplicationFiled: December 10, 2013Publication date: March 3, 2016Inventors: Guoqi YANG, Aiguo ZHENG, Yuewei CHENG, Yuezhong MA
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Patent number: 9199307Abstract: The present invention relates to the tantalum powder and the process for preparing the same, and also relates to the electrolytic capacitor anode made of the tantalum powder. More particularly, the present invention relates to the tantalum powder having a BET surface area not more than 0.530 m2/g, Fisher mean particle size not less than 3.00 ?m. The present invention relates to the process for preparing the tantalum powder, wherein the tantalum powder is prepared through reducing tantalum compound with a reducing agent, wherein the tantalum powder as seed is added during reduction, and said tantalum powder as seed is the tantalum powder that has been milled.Type: GrantFiled: August 2, 2012Date of Patent: December 1, 2015Assignee: Ningxia Orient Tantalum Industry Co., Ltd.Inventors: Guoqi Yang, Wenfeng Shi, Xifang Bao, Yong Li, Zhongxiang Li, Zhangong Dong, Xiaoyan Yang
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Publication number: 20120291593Abstract: The present invention relates to the tantalum powder and the process for preparing the same, and also relates to the electrolytic capacitor anode made of the tantalum powder. More particularly, the present invention relates to the tantalum powder having a BET surface area not more than 0.530 m2/g, Fisher mean particle size not less than 3.00 ?m. The present invention relates to the process for preparing the tantalum powder, wherein the tantalum powder is prepared through reducing tantalum compound with a reducing agent, wherein the tantalum powder as seed is added during reduction, and said tantalum powder as seed is the tantalum powder that has been milled.Type: ApplicationFiled: August 2, 2012Publication date: November 22, 2012Inventors: Guoqi Yang, Wenfeng Shi, Xifang Bao, Yong Li, Zhongxiang Li, Zhangong Dong, Xiaoyan Yang
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Publication number: 20100226070Abstract: The present invention relates to the tantalum powder and the process for preparing the same, and also relates to the electrolytic capacitor anode made of the tantalum powder. More particularly, the present invention relates to the tantalum powder having a BET surface area not more than 0.530 m2/g, Fisher mean particle size not less than 3.00 ?m. The present invention relates to the process for preparing the tantalum powder, wherein the tantalum powder is prepared through reducing tantalum compound with a reducing agent, wherein the tantalum powder as seed is added during reduction, and said tantalum powder as seed is the tantalum powder that has been milled.Type: ApplicationFiled: March 5, 2010Publication date: September 9, 2010Inventors: Guoqi Yang, Wenfeng Shi, Xifang Bao, Yong Li, Zhongxiang Li, Zhangong Dong, Xiaoyan Yang
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Patent number: 7666247Abstract: A method for spherically granulating and agglomerating metal particles such as tantalum and/or niobium powders is described in the present invention, which includes the steps of: a). comminuting the metal particles to form fine particles having D50 less than 50 ?m; b). granulating the comminuted metal particles comprising volatile liquid, for example, tantalum and/or niobium particles comprising volatile liquid, to form wet spherical particles; c). still drying the wet spherical particles and removing volatile liquid to form flowable pre-agglomerated particles with increased bulk density; d). heat treating the pre-agglomerated particles; e). screening the heat treated powder to obtain the flowable agglomerated particles. The present invention provides a flowable spherical agglomerated metal particles, and especially tantalum and/or niobium particles having improved properties. The present agglomerated tantalum powder have a flow rate of at least about 2.0 g/sec, a BET surface area of from about 0.Type: GrantFiled: February 17, 2006Date of Patent: February 23, 2010Assignee: Ningxia Orient Tantalum Industry Co., Ltd.Inventors: Jilin He, Luntao Pan, Aiguo Zheng, Yuewei Cheng, Yuezhong Ma, Hongdong Liu, Guoqi Yang, Chunxiang Wang, Yanping Wang, Shiping Zheng
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Publication number: 20070193409Abstract: A method for spherically granulating and agglomerating metal particles such as tantalum and/or niobium powders is described in the present invention, which includes the steps of: a). comminuting the metal particles to form fine particles having D50 less than 50 ?m; b). granulating the comminuted metal particles comprising volatile liquid, for example, tantalum and/or niobium particles comprising volatile liquid, to form wet spherical particles; c). still drying the wet spherical particles and removing volatile liquid to form flowable pre-agglomerated particles with increased bulk density; d). heat treating the pre-agglomerated particles; e). screening the heat treated powder to obtain the flowable agglomerated particles. The present invention provides a flowable spherical agglomerated metal particles, and especially tantalum and/or niobium particles having improved properties. The present agglomerated tantalum powder have a flow rate of at least about 2.0 g/sec, a BET surface area of from about 0.Type: ApplicationFiled: February 17, 2006Publication date: August 23, 2007Applicant: Ningxia Orient Tantalum Industry Co., Ltd.Inventors: Jilin He, Luntao Pan, Aiguo Zheng, Yuewei Cheng, Yuezhong Ma, Hongdong Liu, Guoqi Yang, Chunxiang Wang, Yanping Wang, Shiping Zheng
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Publication number: 20070068341Abstract: A method for spherically granulating and agglomerating metal particles such as tantalum and/or niobium powders is described in the present invention, which includes the steps of: a). comminuting the metal particles to form fine particles having D50 less than 50 ?m; b). granulating the comminuted metal particles comprising volatile liquid, for example, tantalum and/or niobium particles comprising volatile liquid, to form wet spherical particles; c). still drying the wet spherical particles and removing volatile liquid to form flowable pre-agglomerated particles with increased bulk density; d). heat treating the pre-agglomerated particles; e). screening the heat treated powder to obtain the flowable agglomerated particles. The present invention provides a flowable spherical agglomerated metal particles, and especially tantalum and/or niobium particles having improved properties. The present agglomerated tantalum powder have a flow rate of at least about 2.0 g/sec, a BET surface area of from about 0.Type: ApplicationFiled: February 17, 2006Publication date: March 29, 2007Applicant: Ningxia Orient Tantalum Industry Co., Ltd.Inventors: Yuewei Cheng, Yuezhong Ma, Hongdong Liu, Guoqi Yang, Chunxiang Wang, Yanping Wang, Shiping Zheng