Fine-particle metal powders

Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles

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75245, 420427, C22C 2702

Patent

active

054074584

ABSTRACT:
This invention relates to fine-particle powders of the metals B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and/or Cr which have a defined particle size of 1.0 nm to less than 3 .mu.m. Less than 1% of the individual particles of the powder deviate by more than 40% from the average particle size, and no individual particle of the powder deviates by more than 60% from the average particle size.

REFERENCES:
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patent: 4740238 (1988-04-01), Schiele
patent: 4769064 (1988-09-01), Buss et al.
patent: 4954169 (1990-09-01), Behrens
patent: 4994107 (1991-02-01), Flagan et al.
DIN 66 131: "Determination of Specific Surface Area of Solids by Gas Adsorption Using the Method of Brunauer, Emmett and Teller (BET); fundamentals", published Oct. 1973.
Patent Abstracts of Japan vol. 12, No. 219 (C-506) 22. Jun. 1988 * JP-A-63 016041 (Kawasaki Steel Corp) 23. Jan. 1988 * Zusammenfassung *.
Journal of the Electrochemical Society Bd. 109, Nr. 8, Aug. 1962, Manchester, New Hampshire US, pp. 713-716, H. Lamprey et al "ultrafine tungsten and molybdenum powders".
Cadle, R. D., Particle Size Determination, Interscience Publishers, New York, 1955, pp. 27-50.
Goldman, A. S., et al., "Particle Size Analysis: Theory and Statistical Methods", Van Nostrand Reinhold, 1984, pp. 1-27.
Frisch, B., et al., "Charakterisierung von Pulvern Granulaten, Presskorpern und Porosen Sinter korpern," presented by German Ceramic Society May 1990.

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