Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Making porous product
Patent
1981-03-31
1984-02-21
Cooper, Jack
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Making porous product
29570, 419 30, 419 44, 419 46, 428566, B22B 316
Patent
active
044329350
ABSTRACT:
A porous body, for a solid electrolytic capacitor, is made from a combination of titanium and aluminum in order to reduce dependence upon tatalum, a material which is now in extremely short supply. First, the titanium hydride and aluminum are milled into an extremely fine micro-powder. Then, the powders are mixed with the aluminum content in the range of 45%-65%, compressed into the desired body shape, and given a three-step heat treatment. In the first step, the body is heated at a temperature of 400.degree. to 500.degree. C. for a dehydrogenation. In the second step, the dehydrogenated body is heated to an alloying temperature which is higher than 500.degree. C., but lower than the melting point of aluminum. In the third step, the alloyed body is heated to a temperature which is higher than the melting point of aluminum (about 1000.degree. C.).
REFERENCES:
patent: 3599053 (1971-08-01), Iiada et al.
patent: 3950166 (1976-04-01), Obara et al.
patent: 4219357 (1980-08-01), Yolton et al.
patent: 4331477 (1982-05-01), Kubo et al.
Igarashi Hitoshi
Kubo Yoshimi
Shimizu Shigeaki
Suzuki Tetsuo
Cooper Jack
Nippon Electric Co. Ltd.
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