Process of manufacturing nanocrystalline powders and molded bodi

Details Process of manufacturing nanocrystalline powders and molded bodi Process of manufacturing nanocrystalline powders and molded bodi

1988-04-07

1990-03-20

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75228, 75236, 75244, 75245, 75246, 75251, 75254, 75255, 419 12, 419 13, 419 14, 419 15, 419 16, 419 17, 419 48, 419 49, 419 62, 419 66, C22L 2912

Patent

active

049098403

ABSTRACT:
A process for the production of a secondary powder composition having a nanocrystalline structure and being comprised of binary or quasi-binary substances composed of at least one of the elements Y, Ti, Zr, Hf, Nb, Mo, Ta and W and at least one of the elements V, Cr, Mn, Fe, Co, Ni, Cu and Pd, optionally also containing further ingredients, such as Si, Ge, B and/or oxides, nitrides, borides, carbides, and their possible mixed crystals. The components are in powdered form and are mixed in elementary form or as pre-alloys and have particle sizes ranging from 2 to 250 .mu.m. The powder components are subjected to high mechanical forces in order to produce secondary powders having a nanocrystalline structure. The secondary powders obtained in this way can be processed into molded bodies according to known compression molding processes, but at a temperature below the recrystallization temperature.

REFERENCES:
patent: 4290826 (1981-09-01), Clegg
patent: 4710239 (1987-12-01), Lee et al.
patent: 4715893 (1987-12-01), Skinner et al.
patent: 4743317 (1988-05-01), Skinner et al.
patent: 4792367 (1988-12-01), Lee
Gleiter, H. et al., Z. Metallkunde [Metallurgy], V. 75, No. 40 (1984), pp. 263-267.
Birringer, R., et al., Proc. JIMIS-4, Trans. of Jap. Inst. of Metals, V. 27 (1986), pp. 43 et seq.

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