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1. (WO1991018121) METHOD OF PRODUCING HIGH SURFACE AREA LOW METAL IMPURITY TANTALUM POWDER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/018121 International Application No.: PCT/US1991/003499
Publication Date: 28.11.1991 International Filing Date: 17.05.1991
Chapter 2 Demand Filed: 10.12.1991
IPC:
B22F 9/24 (2006.01) ,C22B 34/24 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
F
WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
9
Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor
16
using chemical processes
18
with reduction of metal compounds
24
starting from liquid metal compounds, e.g. solutions
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
B
PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
34
Obtaining refractory metals
20
Obtaining niobium, tantalum or vanadium
24
Obtaining niobium or tantalum
Applicants:
CABOT CORPORATION [US/US]; 75 State Streetet Boston, MA 02109-1806, US
Inventors:
CHANG, Hongju; US
Agent:
KORIS, David, J.; Cabot Corporation 157 Concord Road Billerica, MA 01821, US
Priority Data:
525,36417.05.1990US
Title (EN) METHOD OF PRODUCING HIGH SURFACE AREA LOW METAL IMPURITY TANTALUM POWDER
(FR) PROCEDE DE PREPARATION DE POUDRE DE TANTALE A GRANDE AIRE DE SURFACE ET A FAIBLE TENEUR EN IMPURETES METALLIQUES
Abstract:
(EN) A process for producing a high purity tantalum powder wherein a small quantity of an active ingredient, having a higher thermodynamic potential and chemical activity than the metal surfaces of the reactor vessel, is added to the reactor before the reactor is heated to reaction temperatures.
(FR) Procédé de préparation de poudre de tantale d'une grande pureté, où une petite quantité d'un ingrédient actif, présentant une activité chimique et un potentiel thermodynamique plus élevés que des surfaces métalliques du récipient de réacteur, est ajoutée au réacteur avant que celui-ci ne soit chauffé jusqu'à atteindre des températures de réaction.
Designated States: AT, AU, BB, BG, BR, CA, CH, DE, DK, ES, FI, GB, HU, JP, KR, LK, LU, MC, MG, MW, NL, NO, RO, SD, SE, SU
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0528974RU02089350JPH05508686KR1019930700687AU1991079793