Arc apparatus for producing ultrafine particles
AssigneeHitachi, Ltd.
InventorsTakeshi Araya, Yoshiro Ibaraki, Yoshishige Endo, Susumu Hioki, Masatoshi Kanamaru
Life of this patent
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Abstract
An apparatus for producing ultrafine particles by arc energy characterized by disposing an electrode inclinedly as to a base material so as to generate a magnetic blow to arc, disposing a suction opening at the direction of the arc blown, and cooling vapors generated, followed by collection thereof can improve the production efficiency of ultrafine particles with a uniform particle size.
Claims14
An apparatus for producing ultrafine particles of metals, alloys or ceramics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, an electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that
- the electrode is disposed inclinedly as to the base material so as to produce magnetic blow to the arc,
- the suction opening is positioned at the direction of the arc blown, and
- a cooling-gas feeder is positioned near the arc.
An apparatus for producing ultrafine particles of metals, alloys or cermics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, at least one electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that:
- the at least one electrode includes an electrode for generating a plasma arc and disposed inclinedly as to the base material so as to produce magnetic blow to the arc, and another arc discharge electrode disposed opposite to the base material so as to generate a gas tungsten arc in addition to the electrode for generating a plasma arc;
- and
- the suction opening is positioned at the direction of the arc blown.
An apparatus for producing ultrafine particles of metals, alloys or ceramics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, an electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that
- the electrode is disposed inclinedly as to the base material so as to produce magnetic blow to the arc,
- the suction opening is positioned at the direction of the arc blown so as to suck a generated vapor, and
- the base material is obtained by melting a raw material in a gas atmosphere containing oxygen or by adding an element for increasing surface tension of a molten metal according to an increase of metal temperature.
Dependencies are inferred from the claim text.