Process of manufacturing nanocrystalline powders and molded bodies
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United States of America Patent
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Mar 20, 1990
Grant Date -
N/A
app pub date -
Apr 7, 1988
filing date -
Apr 29, 1987
priority date (Note) -
Expired
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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.
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