Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles
Patent
1994-10-04
1999-12-14
Beck, Shrive
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
427216, 427217, 427309, 427436, 419 35, 419 64, 419 66, B27N 302, B22F 104, B05D 310, B05D 118
Patent
active
060012897
ABSTRACT:
A metallic composite solid, containing alloys and/or intermetallics, is formed by compacting at moderate pressure a mixture of powder particles, foils or sheets at a temperature close to room temperature, well below the melting temperature of the constituent components and without the addition of low melting metals such as mercury, indium or gallium acting as a sintering agent. This low temperature consolidation of the powder mixture is enhanced by having the surface oxide of the powder particles removed, prior to consolidation, and/or by coating the particles with an oxide-replacing metal such as silver or gold. The coating process may be replacement reactions, autocatalytic reduction or electrolytic reduction. The composite formation is assisted by the addition of a liquid acid such as fluoroboric acid, sulfuric acid, fluoric acid, adipic acid, ascorbic acid, or nitric acid. A preferred embodiment of the process for metal solid composite formation is a process for forming dental restorative materials at ambient temperatures and under pressure exerted by manual dental instrumentation.
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Beane Glenn L.
Dariel Moshe P.
Eichmiller Frederick C.
Guiseppetti Anthony A.
Johnson Christian E.
Barr Michael
Beck Shrive
Materials Innovation Inc.
Wasserman Fran S.
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