Tantalum metal powder

Details Tantalum metal powder Tantalum metal powder

1976-02-04

1977-04-12

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75228, B22F 104

Patent

active

040173020

ABSTRACT:
Improved, high-purity agglomerated tantalum powders characterized by exceptionally high green strength when pressed without using a carbonaceous binder into low density anodes and high electrical capacitance along with low direct current leakage and dissipation factor in the anodes after sintering. Such powder is produced by milling hydrided high-purity tantalum metal ingots or powder to a critical particle size powder, subjecting the powder to a two-step heat treatment to degas and pre-agglomerate it, screening and milling the oversize portion of the degassed and pre-agglomerated powder to achieve intermediate mesh size powder, subjecting this powder to a higher temperature treatment to agglomerate it, milling the agglomerated powder to an intermediate mesh fraction, screening the powder to remove the fine particle size portion, subjecting this fine particle material to an additional heat treatment to re-agglomerate it, and blending the re-agglomerated fines with the coarser mesh size portions of the agglomerated powder.

REFERENCES:
patent: 2107279 (1938-02-01), Balke et al.
patent: 3295951 (1967-01-01), Fincham et al.
patent: 3415639 (1968-12-01), Daendliker et al.
patent: 3697255 (1972-10-01), Baldwin et al.

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