Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Including plural heating steps
Patent
1996-02-21
1998-09-29
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Including plural heating steps
264776, 264781, 264118, 264125, 419 23, 419 26, 419 57, 419 58, B29B 900
Patent
active
058142720
ABSTRACT:
A method for forming dendritic metal powders, comprising the steps of: (1) heating a powder comprising non-dendritic particles, under conditions suitable for initial stage sintering, to form a lightly sintered material; and (2) breaking the lightly sintered material to form a powder comprising dendritic particles. In one embodiment, the lightly sintered material is broken by brushing the material through a screen. Another aspect of the present invention comprises the dendritic particles that are produced by the method described above. These particles can comprise any suitable metal, such as transition metals, rare earth metals, main group metals or metalloids or an alloy of two or more such metals. The particles can also comprise a ceramic material, such as a metal oxide. These particles are characterized by a dendritic, highly anisotropic, morphology arising from the fusion of substantially non-dendritic particles, and by a low apparent density relative to the substantially non-dendritic starting material. The present dendritic particles can be of high purity, and substantially free of carbon contamination.
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patent: 5069867 (1991-12-01), Zengin
patent: 5487771 (1996-01-01), Zeller
German, R.M., Powder Metallurgy Science 2nd Edition, Chapter 7:241-263 (1994).
Metals Handbook 9th Edition, 7:71-72, 79-99, 105-120, 134-143 (Publisher: American Society for Metals) (1984).
Vroman Christopher J.
Zeller Robert S.
Millipore Corporation
Theisen Mary Lynn
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