Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1977-05-31
1979-02-27
Stallard, W.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75251, 148126, B22F 104
Patent
active
041417194
ABSTRACT:
Improved, high-purity agglomerated tantalum powders having an exceptional combination of a relatively low oxygen content, high green strength when pressed into compacts without using any binders, and, when compacted and sintered as anodes for capacitors have reduced shrinkage of the pressed compacts during sintering, and have high electrical capacitance and breakdown voltage along with low direct current leakage and low dissipation factor. Such powder is produced by milling hydrided high-purity tantalum metal ingots to a powder of specified particle size and size distribution, subjecting the powder to a heat treatment at a temperature T-1 to degas and preagglomerate it, milling and screening the degassed and preagglomerated powder to preferably about -200 mesh size, subjecting the -200 mesh powder to a higher temperature T-2 to reagglomerate it, milling and screening the reagglomerated powder to about -35 mesh, and blending the final powder. The final powder is compacted without a binder and sintered to produce anodes of electrolytic capacitors.
REFERENCES:
patent: 3418106 (1968-12-01), Pierret
patent: 3473915 (1969-10-01), Pierret
patent: 3635693 (1972-01-01), Friedrich et al.
patent: 4009007 (1977-02-01), Fry
patent: 4017302 (1977-04-01), Bates et al.
Fansteel Inc.
Stallard W.
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