SG52629A1 - A process for making an improved tantalum powder and high capacitance low leakage electromode made therefrom - Google Patents

A process for making an improved tantalum powder and high capacitance low leakage electromode made therefrom

Info

Publication number
SG52629A1
SG52629A1 SG1996007012A SG1996007012A SG52629A1 SG 52629 A1 SG52629 A1 SG 52629A1 SG 1996007012 A SG1996007012 A SG 1996007012A SG 1996007012 A SG1996007012 A SG 1996007012A SG 52629 A1 SG52629 A1 SG 52629A1
Authority
SG
Singapore
Prior art keywords
electromode
making
made therefrom
low leakage
high capacitance
Prior art date
Application number
SG1996007012A
Other languages
English (en)
Inventor
Hongju Chang
David J Koris
Original Assignee
Cabot Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cabot Corp filed Critical Cabot Corp
Publication of SG52629A1 publication Critical patent/SG52629A1/en

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004Details
    • H01G9/04Electrodes or formation of dielectric layers thereon
    • H01G9/048Electrodes or formation of dielectric layers thereon characterised by their structure
    • H01G9/052Sintered electrodes
    • H01G9/0525Powder therefor
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/04Making non-ferrous alloys by powder metallurgy
    • C22C1/045Alloys based on refractory metals

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Inorganic Insulating Materials (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Semiconductor Integrated Circuits (AREA)
SG1996007012A 1993-04-26 1994-04-15 A process for making an improved tantalum powder and high capacitance low leakage electromode made therefrom SG52629A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/052,876 US5448447A (en) 1993-04-26 1993-04-26 Process for making an improved tantalum powder and high capacitance low leakage electrode made therefrom

Publications (1)

Publication Number Publication Date
SG52629A1 true SG52629A1 (en) 1998-09-28

Family

ID=21980485

Family Applications (1)

Application Number Title Priority Date Filing Date
SG1996007012A SG52629A1 (en) 1993-04-26 1994-04-15 A process for making an improved tantalum powder and high capacitance low leakage electromode made therefrom

Country Status (15)

Country Link
US (1) US5448447A (zh)
EP (1) EP0647349B1 (zh)
JP (1) JP3174341B2 (zh)
KR (1) KR100293304B1 (zh)
CN (2) CN1046878C (zh)
AT (1) ATE146299T1 (zh)
AU (1) AU6706194A (zh)
CZ (2) CZ292006B6 (zh)
DE (1) DE69401112T2 (zh)
HK (1) HK59697A (zh)
RU (1) RU2154871C2 (zh)
SG (1) SG52629A1 (zh)
TW (1) TW439076B (zh)
UA (1) UA41325C2 (zh)
WO (1) WO1994025971A1 (zh)

Families Citing this family (107)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5580367A (en) * 1987-11-30 1996-12-03 Cabot Corporation Flaked tantalum powder and method of using same flaked tantalum powder
DE69516556T2 (de) * 1994-01-26 2000-09-07 Starck H C Inc Verfahren zum Nitrieren von Tantalpulver
US20030145682A1 (en) * 1994-08-01 2003-08-07 Kroftt-Brakston International, Inc. Gel of elemental material or alloy and liquid metal and salt
US7435282B2 (en) 1994-08-01 2008-10-14 International Titanium Powder, Llc Elemental material and alloy
US7445658B2 (en) 1994-08-01 2008-11-04 Uchicago Argonne, Llc Titanium and titanium alloys
US20030061907A1 (en) * 1994-08-01 2003-04-03 Kroftt-Brakston International, Inc. Gel of elemental material or alloy and liquid metal and salt
JPH0897096A (ja) * 1994-09-28 1996-04-12 Sutaruku Buitetsuku Kk タンタル粉末及びそれを用いた電解コンデンサ
US6165623A (en) 1996-11-07 2000-12-26 Cabot Corporation Niobium powders and niobium electrolytic capacitors
US5869196A (en) * 1996-12-20 1999-02-09 Composite Material Technology, Inc. Constrained filament electrolytic anode and process of fabrication
US5825611A (en) * 1997-01-29 1998-10-20 Vishay Sprague, Inc. Doped sintered tantalum pellets with nitrogen in a capacitor
CZ302792B6 (cs) 1997-02-19 2011-11-09 H.C. Starck Gmbh. Práškový tantal, zpusob jeho výroby a z nej získatelné anody a kondenzátory
JP3254163B2 (ja) 1997-02-28 2002-02-04 昭和電工株式会社 コンデンサ
US6051044A (en) * 1998-05-04 2000-04-18 Cabot Corporation Nitrided niobium powders and niobium electrolytic capacitors
BRPI9911008B1 (pt) * 1998-05-06 2018-09-25 Starck H C Gmbh processo para a produção de capacitor de pós de metal, pó de nióbio, anodo de capacitor, pó de liga para uso na fabricação de capacitores eletrolíticos, processo para a fabricação de pó de liga
JP3196832B2 (ja) 1998-05-15 2001-08-06 日本電気株式会社 固体電解コンデンサ及びその製造方法
US6576038B1 (en) * 1998-05-22 2003-06-10 Cabot Corporation Method to agglomerate metal particles and metal particles having improved properties
ATE385037T1 (de) * 1998-08-05 2008-02-15 Showa Denko Kk Niob-sinter für kondensator und verfahren zu seiner herstellung
US6462934B2 (en) 1998-09-16 2002-10-08 Cabot Corporation Methods to partially reduce a niobium metal oxide and oxygen reduced niobium oxides
US6322912B1 (en) * 1998-09-16 2001-11-27 Cabot Corporation Electrolytic capacitor anode of valve metal oxide
US6416730B1 (en) 1998-09-16 2002-07-09 Cabot Corporation Methods to partially reduce a niobium metal oxide oxygen reduced niobium oxides
US6391275B1 (en) 1998-09-16 2002-05-21 Cabot Corporation Methods to partially reduce a niobium metal oxide and oxygen reduced niobium oxides
US6529367B1 (en) 1998-12-15 2003-03-04 Showa Denko Kabushiki Kaisha Niobium capacitor and method of manufacture thereof
US6515846B1 (en) * 1999-02-08 2003-02-04 H.C. Starck, Inc. Capacitor substrates made of refractory metal nitrides
TW460883B (en) * 1999-02-16 2001-10-21 Showa Denko Kk Niobium powder, niobium sintered body, capacitor comprised of the sintered body, and method for manufacturing the capacitor
WO2000049633A1 (fr) * 1999-02-16 2000-08-24 Showa Denko K.K. Poudre de niobium, element fritte a base de niobium, condensateur renfermant cet element et procede de fabrication de ce condensateur
US6402066B1 (en) 1999-03-19 2002-06-11 Cabot Corporation Method of making niobium and other metal powders
US6558447B1 (en) * 1999-05-05 2003-05-06 H.C. Starck, Inc. Metal powders produced by the reduction of the oxides with gaseous magnesium
US6375704B1 (en) * 1999-05-12 2002-04-23 Cabot Corporation High capacitance niobium powders and electrolytic capacitor anodes
TW479262B (en) 1999-06-09 2002-03-11 Showa Denko Kk Electrode material for capacitor and capacitor using the same
US6960237B2 (en) 1999-07-15 2005-11-01 Showa Denko Kabushiki Kaisha Niobium powder, sintered body thereof and capacitor using the same
US6600646B1 (en) * 1999-08-11 2003-07-29 Showa Denko Kabushiki Kaisha Niobium powder, sintered body thereof and capacitor using same
US6660057B1 (en) * 1999-10-01 2003-12-09 Showa Denko K.K. Powder composition for capacitor, sintered body using the composition and capacitor using the sintered body
JP3585791B2 (ja) * 1999-11-04 2004-11-04 Necトーキン株式会社 固体電解コンデンサ用陽極体の製造方法及びその製造方法に用いられる連続焼結装置
US6423110B1 (en) 1999-12-08 2002-07-23 Showa Denko K.K. Powder composition for capacitor and sintered body using the composition, and capacitor using the sintered body
JP4049964B2 (ja) * 2000-02-08 2008-02-20 キャボットスーパーメタル株式会社 窒素含有金属粉末およびその製造方法ならびにそれを用いた多孔質焼結体および固体電解コンデンサー
US6432161B1 (en) * 2000-02-08 2002-08-13 Cabot Supermetals K.K. Nitrogen-containing metal powder, production process thereof, and porous sintered body and solid electrolytic capacitor using the metal powder
IL151549A0 (en) 2000-03-01 2003-04-10 Cabot Corp Nitrided valve metals and processes for making the same
US6576099B2 (en) 2000-03-23 2003-06-10 Cabot Corporation Oxygen reduced niobium oxides
US6540810B2 (en) 2000-04-21 2003-04-01 Showa Denko Kabushiki Kaisha Niobium powder for capacitor, sintered body using the powder and capacitor using the same
EP1281460B1 (en) 2000-04-24 2008-03-12 Showa Denko K.K. Niobium powder, sintered compact thereof and capacitor
DE10030387A1 (de) * 2000-06-21 2002-01-03 Starck H C Gmbh Co Kg Kondensatorpulver
US6652619B2 (en) * 2000-08-10 2003-11-25 Showa Denko K.K. Niobium powder, sintered body thereof, and capacitor using the same
EP1324359B2 (en) 2000-08-10 2017-10-04 Showa Denko K.K. Niobium powder, sinter thereof, and capacitor employing the same
JP2002093666A (ja) * 2000-09-20 2002-03-29 Showa Denko Kk ニオブ粉、それを用いた焼結体及びそれを用いたコンデンサ
US6554884B1 (en) * 2000-10-24 2003-04-29 H.C. Starck, Inc. Tantalum and tantalum nitride powder mixtures for electrolytic capacitors substrates
CN100477041C (zh) * 2000-11-06 2009-04-08 卡伯特公司 改性氧还原电子管金属氧化物
US6447570B1 (en) * 2000-11-30 2002-09-10 Vishay Sprague, Inc. Sintered Tantalum and Niobium capacitor pellets doped with Nitrogen, and method of making the same
AU2002224129A1 (en) * 2000-11-30 2002-06-11 Showa Denko K K Niobium powder for capacitor, sintered body thereof and capacitor using the sintered body
KR100812689B1 (ko) * 2000-12-01 2008-03-13 쇼와 덴코 가부시키가이샤 커패시터용 니오브 분말, 그 소결체 및 소결체를 이용한커패시터
JP4521849B2 (ja) * 2000-12-01 2010-08-11 昭和電工株式会社 コンデンサ用ニオブ粉と該ニオブ粉を用いた焼結体および該焼結体を用いたコンデンサ
JP4187953B2 (ja) * 2001-08-15 2008-11-26 キャボットスーパーメタル株式会社 窒素含有金属粉末の製造方法
US7621977B2 (en) 2001-10-09 2009-11-24 Cristal Us, Inc. System and method of producing metals and alloys
JP3965300B2 (ja) * 2002-01-18 2007-08-29 Necトーキン株式会社 Nb固体電解コンデンサおよびその製造方法
JP2004076063A (ja) * 2002-08-13 2004-03-11 Kawatetsu Mining Co Ltd ニオブ合金粉末、固体電解コンデンサ用アノード及び固体電解コンデンサ
WO2004022800A1 (en) 2002-09-07 2004-03-18 International Titanium Powder, Llc. Process for separating ti from a ti slurry
US7655214B2 (en) * 2003-02-26 2010-02-02 Cabot Corporation Phase formation of oxygen reduced valve metal oxides and granulation methods
US7445679B2 (en) * 2003-05-16 2008-11-04 Cabot Corporation Controlled oxygen addition for metal material
US7515397B2 (en) * 2003-05-19 2009-04-07 Cabot Corporation Methods of making a niobium metal oxide and oxygen reduced niobium oxides
CN100528417C (zh) * 2003-06-10 2009-08-19 卡伯特公司 钽粉及其制造方法
ATE554490T1 (de) * 2003-11-10 2012-05-15 Showa Denko Kk Niobpulver für einen kondensator, niob- gesinterter körper und kondensator
US7803235B2 (en) * 2004-01-08 2010-09-28 Cabot Corporation Passivation of tantalum and other metal powders using oxygen
DE102004002109A1 (de) * 2004-01-14 2005-08-11 Deutsche Telekom Ag Behandlung von Kristallen zur Vermeidung lichtinduzierter Änderungen des Brechungsindex
JP2008504692A (ja) * 2004-06-28 2008-02-14 キャボット コーポレイション 高キャパシタンスのタンタルフレークス及びその生産方法
US20080011124A1 (en) * 2004-09-08 2008-01-17 H.C. Starck Gmbh & Co. Kg Deoxidation of Valve Metal Powders
US7431751B2 (en) * 2004-09-29 2008-10-07 H.C. Starck Inc. Magnesium removal from magnesium reduced metal powders
US7099143B1 (en) 2005-05-24 2006-08-29 Avx Corporation Wet electrolytic capacitors
US20070017319A1 (en) 2005-07-21 2007-01-25 International Titanium Powder, Llc. Titanium alloy
JP2009511739A (ja) 2005-10-06 2009-03-19 インターナショナル・タイテイニアム・パウダー・リミテッド・ライアビリティ・カンパニー ホウ化チタン
US8257463B2 (en) * 2006-01-23 2012-09-04 Avx Corporation Capacitor anode formed from flake powder
US7511943B2 (en) 2006-03-09 2009-03-31 Avx Corporation Wet electrolytic capacitor containing a cathode coating
US7480130B2 (en) 2006-03-09 2009-01-20 Avx Corporation Wet electrolytic capacitor
GB2450669B (en) * 2006-05-05 2012-03-21 Cabot Corp Tantalam powder and methods of manufacturing same
GB0622463D0 (en) * 2006-11-10 2006-12-20 Avx Ltd Powder modification in the manufacture of solid state capacitor anodes
US7753989B2 (en) 2006-12-22 2010-07-13 Cristal Us, Inc. Direct passivation of metal powder
US7554792B2 (en) 2007-03-20 2009-06-30 Avx Corporation Cathode coating for a wet electrolytic capacitor
US7460356B2 (en) 2007-03-20 2008-12-02 Avx Corporation Neutral electrolyte for a wet electrolytic capacitor
US7649730B2 (en) 2007-03-20 2010-01-19 Avx Corporation Wet electrolytic capacitor containing a plurality of thin powder-formed anodes
US9127333B2 (en) 2007-04-25 2015-09-08 Lance Jacobsen Liquid injection of VCL4 into superheated TiCL4 for the production of Ti-V alloy powder
US7837743B2 (en) * 2007-09-24 2010-11-23 Medtronic, Inc. Tantalum anodes for high voltage capacitors employed by implantable medical devices and fabrication thereof
EP2214853A4 (en) * 2007-10-15 2013-05-22 Hi Temp Specialty Metals Inc PROCESS FOR PREPARING TANTALUM POWDER USING RECYCLED AGENTS AS AN EXISTING MATERIAL
BRPI0802018B1 (pt) 2008-04-30 2019-01-29 Univ Minas Gerais processo de síntese de nanotubos de carbono sobre o clínquer de cimento e compósito nanoestruturado
DE102008026304A1 (de) * 2008-06-02 2009-12-03 H.C. Starck Gmbh Verfahren zur Herstellung von Elektrolytkondensatoren mit niedrigem Leckstrom
US20100085685A1 (en) * 2008-10-06 2010-04-08 Avx Corporation Capacitor Anode Formed From a Powder Containing Coarse Agglomerates and Fine Agglomerates
US8430944B2 (en) * 2008-12-22 2013-04-30 Global Advanced Metals, Usa, Inc. Fine particle recovery methods for valve metal powders
JP2009275289A (ja) * 2009-07-10 2009-11-26 Cabot Supermetal Kk 窒素含有金属粉末の製造方法
US8619410B2 (en) * 2010-06-23 2013-12-31 Avx Corporation Solid electrolytic capacitor for use in high voltage applications
RU2446499C1 (ru) * 2010-11-01 2012-03-27 Открытое акционерное общество "Элеконд" (ОАО "Элеконд") Способ изготовления анодов объемно-пористых электролитических конденсаторов
US8687347B2 (en) 2011-01-12 2014-04-01 Avx Corporation Planar anode for use in a wet electrolytic capacitor
DE102013101443A1 (de) * 2012-03-01 2013-09-05 Avx Corporation Ultrahigh voltage solid electrolytic capacitor
CN102773478A (zh) * 2012-07-10 2012-11-14 中国振华(集团)新云电子元器件有限责任公司 一种提高钽块机械强度的烧结方法
US9548163B2 (en) 2012-07-19 2017-01-17 Avx Corporation Solid electrolytic capacitor with improved performance at high voltages
JP2013136841A (ja) * 2013-01-30 2013-07-11 Cabot Supermetal Kk 窒素含有金属粉末の製造方法
US9633796B2 (en) 2013-09-06 2017-04-25 Greatbatch Ltd. High voltage tantalum anode and method of manufacture
US9312075B1 (en) * 2013-09-06 2016-04-12 Greatbatch Ltd. High voltage tantalum anode and method of manufacture
USRE48439E1 (en) 2013-09-06 2021-02-16 Greatbatch Ltd. High voltage tantalum anode and method of manufacture
US20160322169A1 (en) * 2013-12-20 2016-11-03 Showa Denko K.K. Tungsten powder, anode body for capacitors, and electrolytic capacitor
RU2661736C1 (ru) 2013-12-20 2018-07-19 Фишер Энд Пейкел Хелткэа Лимитед Соединения системы увлажнения
JP6977021B2 (ja) * 2016-07-13 2021-12-08 ニンシア オリエント タンタル インダストリー カンパニー、 リミテッド 薄片状タンタル粉末およびその調製方法
EP3496884B1 (en) 2016-08-12 2021-06-16 COMPOSITE MATERIALS TECHNOLOGY, Inc. Electrolytic capacitor and method for improved electrolytic capacitor anodes
CN109562950B (zh) 2016-09-01 2020-05-19 复合材料技术公司 用于LIB阳极的阀金属基底上的纳米级/纳米结构Si涂层
US20180144874A1 (en) 2016-10-21 2018-05-24 Global Advanced Metals, Usa, Inc. Tantalum Powder, Anode, And Capacitor Including Same, And Manufacturing Methods Thereof
EP3746240A2 (en) 2018-03-05 2020-12-09 Global Advanced Metals USA, Inc. Spherical tantalum powder, products containing the same, and methods of making the same
KR102389784B1 (ko) 2018-03-05 2022-04-22 글로벌 어드밴스드 메탈스 유에스에이, 아이엔씨. 구형 분말을 함유하는 애노드 및 커패시터
CA3120873A1 (en) 2018-12-12 2020-06-18 Craig M. Sungail Spherical niobium alloy powder, products containing the same, and methods of making the same
CN110760884A (zh) * 2019-11-06 2020-02-07 南通冠达粉末冶金有限公司 一种粉末冶金辅助材料的制备工艺
US11450486B2 (en) * 2020-04-03 2022-09-20 Greatbatch Ltd. Electrolytic capacitor having a tantalum anode
RU2740582C1 (ru) * 2020-07-21 2021-01-15 федеральное государственное бюджетное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" Способ изготовления анодов танталового конденсатора

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427132A (en) * 1967-04-12 1969-02-11 Nat Res Corp Tantalum nitride powder and method for its preparation
FR2218633B1 (zh) * 1973-02-19 1977-07-22 Lignes Telegraph Telephon
US3825802A (en) * 1973-03-12 1974-07-23 Western Electric Co Solid capacitor
DE2610224C2 (de) * 1976-03-11 1983-01-05 Fa. Hermann C. Starck Berlin, 1000 Berlin Verfahren zur Herstellung von porösen Anodenkörpern durch Pressen und Sintern von Pulvern aus Ventilmetallen
JPS5349254A (en) * 1976-10-15 1978-05-04 Fujitsu Ltd Method of manufacturing tantalum nitride electrolytic capacitor
DE3130392C2 (de) * 1981-07-31 1985-10-17 Hermann C. Starck Berlin, 1000 Berlin Verfahren zur Herstellung reiner agglomerierter Ventilmetallpulver für Elektrolytkondensatoren, deren Verwendung und Verfahren zur Herstellung von Sinteranoden
US4423004A (en) * 1983-03-24 1983-12-27 Sprague Electric Company Treatment of tantalum powder
US4544403A (en) * 1984-11-30 1985-10-01 Fansteel Inc. High charge, low leakage tantalum powders
JPS6386509A (ja) * 1986-09-30 1988-04-16 松下電器産業株式会社 タンタル多孔質焼結体

Also Published As

Publication number Publication date
CN1108036A (zh) 1995-09-06
CN1046878C (zh) 1999-12-01
EP0647349B1 (en) 1996-12-11
HK59697A (en) 1997-05-16
JPH07508618A (ja) 1995-09-21
CZ292006B6 (cs) 2003-07-16
US5448447A (en) 1995-09-05
JP3174341B2 (ja) 2001-06-11
AU6706194A (en) 1994-11-21
CZ293364B6 (cs) 2004-04-14
CN1236177A (zh) 1999-11-24
UA41325C2 (uk) 2001-09-17
DE69401112D1 (de) 1997-01-23
TW439076B (en) 2001-06-07
RU2154871C2 (ru) 2000-08-20
ATE146299T1 (de) 1996-12-15
DE69401112T2 (de) 1997-04-03
KR100293304B1 (ko) 2001-10-24
WO1994025971A1 (en) 1994-11-10
CZ315994A3 (en) 1995-12-13
CN1143333C (zh) 2004-03-24
EP0647349A1 (en) 1995-04-12
RU94046324A (ru) 1996-10-27

Similar Documents

Publication Publication Date Title
SG52629A1 (en) A process for making an improved tantalum powder and high capacitance low leakage electromode made therefrom
EP0953847B1 (en) Capacitor with an electrode composed of a sintered body of partially nitrided niobium powder
DE60022357D1 (de) Niobiumpulver und daraus hergestellte elektrolytische kondensatoren mit hoher kapazität
EP0367068A3 (en) Capacitor grade tantalum powder
TW430833B (en) Niobium sintered body for capacitor and process for producing same
DE69923773D1 (de) Nitridiertes niobiumpulver und niobium-elektrolytkondensatoren
DE3570008D1 (en) Tantalum powders for the manufacture of electrodes for electrolytic capacitors with a high charge and low leakage current
AU2000268772A1 (en) Production of nitrogen-containing tantalum or niobium powder and solid electrolytic capacitor
AU6017200A (en) Niobium powder, its sintered body, and capacitor comprising the same
WO2002045106A3 (en) Powder for capacitor, sintered body thereof and capacitor using the sintered body
MY132666A (en) Niobium powders and niobium electrolytic capacitors
AU7448900A (en) Capacitor powder composition, sintered body made of the composition, and capacitor made of the sintered body
US6765786B2 (en) Niobium powder and solid electrolytic capacitor using the same
EP1075884A3 (en) Niobium powders and niobium electrolytic capacitors
Zhong et al. Carbothermic Reduction of Tantalum Oxide--a Still Effective Method for Production of Capacitor Grade Tantalum Powder
IE43055L (en) Electrode for an electrolytic capacitor
CA2173427A1 (en) Negative electrode carbonaceous material, method of preparing same and non-aqueous electrolyte-type secondary cell using same
GB1457293A (en) Production of tool steel articles