Apparatus and methods for the production of powders

An equipment and powder technology, which is used in the production of ultra-fine powder, also known as nano-powder, in the field of explosion and discharge, and can solve the problems of unbalanced lattice and high quenching speed of pure metal.

Inactive Publication Date: 2002-10-30
AMERICAN INTER METALLICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in EEW the quenching rate is so high (up to 10 9 ℃ / sec) so that pure metals can also produce unbalanced lattice

Method used

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  • Apparatus and methods for the production of powders
  • Apparatus and methods for the production of powders
  • Apparatus and methods for the production of powders

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Embodiment Construction

[0050] The present invention provides an improved method and method for the production of ultrafine metal powders, or equivalently metal oxides, metal nitrides, metal carbides and other compounds which can be produced by the reaction of a dense metal plasma with the surrounding (bath) gas equipment. Provides high voltage, high current, pulsed power to efficiently deliver large amounts of electrical energy to the wire. Preferably, the energy delivered is substantially in excess of that required to vaporize the metal (eg, by a factor of about 1.1 to about 3 in preferred embodiments), resulting in a condition known as "superheating." Energy is delivered for a short enough time (eg, a few microseconds in a preferred embodiment) to ensure that the wire bursts apart rather than simply vaporizing.

[0051] For example, with 26AWG (0.404mm diameter) aluminum wire stock (e.g. Alloy 1188 (minimum 99.88% purity), tempered to H-18 (very soft)) blasted in 10 inch (25cm) lengths, applicabl...

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Abstract

Metal powders are formed by the electro-explosive wire (EEW) method. The device (20) for producing this powder comprises a closed loop gas passage between the reaction chamber (100) and the extractor (32). The wire (31) is transported from the source (400) to the chamber along the wire channel from the ambient conditions outside the reaction chamber. Inside the chamber, a first electrode (200) has a hole defining said wire channel, and a second electrode (202) is near the end of the wire channel. The electric energy source (26) applies a discharge voltage between the electrodes to make this section of metal wire explode to form initial particles. The starting microparticles can optionally be extracted and processed to produce desired powders, especially high energy powders that are passivated so as to be stable under ambient conditions.

Description

[0001] This application claims priority to US Provisional Patent Application No. 60 / 152,377, entitled "Powder Production Apparatus and Method," filed September 3,1999. Background of the invention [0002] The present invention relates to the production of powders. More particularly, it relates to explosive discharge methods and apparatus for the production of ultrafine powders, also known as nanopowders (often referred to as having an average particle size of less than 1 micron). [0003] Powders of metals and their derivatives such as oxides and nitrides have many uses, including the production of sintering components, surface coatings, composites, chemical catalysts, electrochemically active surfaces, pigments, electrically and thermally conductive pastes and adhesives. [0004] Powders of certain metals, especially aluminum and magnesium, are also used as oxidizers in rocket solid fuels, where the particle size, agglomeration, composition, and surface state of the powder (a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20B01J19/08B02C19/00B22F9/04B22F9/14C01B13/32C01F5/02C01F5/04C01F7/424C23C8/10
CPCB22F9/14B22F2998/00B82Y30/00C01B13/322C01F5/02C01F5/04C01F7/424C01P2004/32C01P2004/62C01P2004/64C01P2004/84C23C8/10B22F1/054
Inventor 斯蒂芬·G·巴拉德
Owner AMERICAN INTER METALLICS
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