METHOD OF PREPARING SILVER-PALLADIUM ALLOY POWDER Russian patent published in 2004 - IPC

Abstract RU 2226223 C2

FIELD: powder metallurgy. SUBSTANCE: method, which can be used when manufacturing electrodes of ceramic condensers, comprises following operations: neutralization with ammonia solution to pH 1.8-2.0 and reduction of metals from precooled to 10-17 C solutions followed by double-step raise of temperature from 28 to 100 C. In the first step, reaction mixture is held for 20 min at 60-65 C and, in the second stage, 20 min at 95-100 C while simultaneously reducing and surface-treating reaction mixture with solution of hydrazine hydrate with polyvinyl alcohol or ammonium salt of low-viscosity polyacrylic acid having concentration 0.125-0.128 g/l and sodium salt of methacrylic acid/methacrylate copolymer having concentration 0.020-0.023 g/l. Thus obtained powder is dried and additionally annealed for 0.5-2.0 h in inert atmosphere at 320-400 C, after which consecutively treated with ammonium pyrophosphate, 0.4-0.8 g/l, and alkyl phosphate, 110-120 g/l, for 2-3 h with each reagent and dried in inert atmosphere. Claimed method allows preparation of silver-palladium alloy powders with specific surface between 1.5 and 5.0 sq.m/g and apparent density between 0.7 and 1.25 g/cu.cm. EFFECT: raised level of electric parameters of condensers. 3 cl, 1 dwg, 1 tbl

Similar patents RU2226223C2

Title Year Author Number
METHOD OF PREPARING SILVER-PALLADIUM ALLOY POWDER 1999
  • Timofeev N.I.
  • Bogdanov V.I.
  • Gorbatova L.D.
  • Korepanov S.S.
RU2150354C1
METHOD FOR OBTAINING ULTRADISPERSE POWDERS OF ALLOYS 2013
  • Novikov Aleksandr Nikolaevich
RU2533622C1
METHOD FOR PRODUCING COMPOSITE METAL-DIAMOND COATING ON THE SURFACE OF MEDICAL DEVICE, DISPERSED SYSTEM FOR PRECIPITATION OF METAL-DIAMOND COATING AND METHOD FOR ITS PRODUCING 2020
  • Esaulov Sergej Konstantinovich
  • Esaulova Tselina Vatslavovna
  • Minyaeva Elena Vladimirovna
RU2746730C1
METAL AND METAL OXIDE NANOPARTICLE PRODUCING METHOD 2004
  • Aleksandrova G.P.
  • Medvedeva S.A.
  • Grishchenko L.A.
  • Sukhov B.G.
  • Trofimov B.A.
RU2260500C1
SILVER POWDER PRODUCTION METHOD 2003
  • Berdnikova Elena Vladimirovna
  • Volkovskij Aleksandr Fedorovich
RU2283208C2
METHOD FOR PRODUCING COMPOSITE METAL-DISPERSED COATING, DISPERSED SYSTEM FOR PRECIPITATION OF COMPOSITE METAL-DISPERSED COATING AND METHOD FOR ITS PRODUCTION 2020
  • Esaulov Sergej Konstantinovich
  • Esaulova Tselina Vatslavovna
RU2746863C1
METHOD FOR PRODUCING A COMPOSITE METAL-DISPERSED COATING, DISPERSED SYSTEM FOR PRECIPITATION OF COMPOSITE METAL-DISPERSED COATING AND METHOD OF ITS PRODUCTION 2020
  • Esaulov Sergej Konstantinovich
  • Kukushkin Sergej Sergeevich
  • Svetlov Gennadij Valentinovich
  • Esaulova Tselina Vatslavovna
RU2746861C1
COMPOSITE METAL-DIAMOND COATING, METHOD OF ITS PRODUCTION, DISPERSE SYSTEM FOR DEPOSITION OF COMPOSITE METAL-DIAMOND COATING AND METHOD FOR ITS PRODUCTION 2019
  • Esaulov Sergej Konstantinovich
  • Kukushkin Sergej Sergeevich
  • Ryzhov Evgenij Vasilevich
  • Svetlov Gennadij Valentinovich
RU2706931C1
METHOD OF PRODUCING CATION-SUBSTITUTED TRICALCIUM PHOSPHATE 2015
  • Barinov Sergej Mironovich
  • Fadeeva Inna Vilorovna
  • Fomin Aleksandr Sergeevich
  • Filippov Yaroslav Yurevich
RU2607743C1
FINELY DISPERSED METAL-CONTAINING POWDER AND METHOD OF PREPARATION THEREOF 1994
  • Teo Kenig
  • Ditmar Fister
RU2136444C1

RU 2 226 223 C2

Authors

Dates

2004-03-27Published

2001-07-04Filed