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Title: Method for producing solid or hollow spherical particles of chosen chemical composition and of uniform size

Abstract

A method is provided for producing commercially large quantities of high melting temperature solid or hollow spherical particles of a predetermined chemical composition and having a uniform and controlled size distribution. An end (18, 50, 90) of a solid or hollow rod (20, 48, 88) of the material is rendered molten by a laser beam (14, 44, 82). Because of this, there is no possibility of the molten rod material becoming contaminated with extraneous material. In various aspects of the invention, an electric field is applied to the molten rod end (18, 90), and/or the molten rod end (50, 90) is vibrated. In a further aspect of the invention, a high-frequency component is added to the electric field applied to the molten end of the rod (90). By controlling the internal pressure of the rod, the rate at which the rod is introduced into the laser beam, the environment of the process, the vibration amplitude and frequency of the molten rod end, the electric field intensity applied to the molten rod end, and the frequency and intensity of the component added to the electric field, the uniformity and size distribution of the solid or hollow spherical particles (122) produced bymore » the inventive method is controlled. The polarity of the electric field applied to the molten rod end can be chosen to eliminate backstreaming electrons, which tend to produce run-away heating in the rod, from the process.« less

Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
866727
Patent Number(s):
4774037
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; producing; solid; hollow; spherical; particles; chosen; chemical; composition; uniform; size; provided; commercially; quantities; melting; temperature; predetermined; controlled; distribution; 18; 50; 90; rod; 20; 48; 88; material; rendered; molten; laser; beam; 14; 44; 82; possibility; becoming; contaminated; extraneous; various; aspects; electric; field; applied; vibrated; aspect; high-frequency; component; added; controlling; internal; pressure; rate; introduced; environment; process; vibration; amplitude; frequency; intensity; uniformity; 122; produced; inventive; polarity; eliminate; backstreaming; electrons; tend; produce; run-away; heating; various aspects; chemical composition; spherical particles; melting temperature; size distribution; temperature solid; electric field; laser beam; hollow spherical; field intensity; inventive method; uniform size; field applied; internal pressure; frequency component; producing solid; spherical particle; producing commercial; controlled size; /264/65/75/376/

Citation Formats

Hendricks, Charles D. Method for producing solid or hollow spherical particles of chosen chemical composition and of uniform size. United States: N. p., 1988. Web.
Hendricks, Charles D. Method for producing solid or hollow spherical particles of chosen chemical composition and of uniform size. United States.
Hendricks, Charles D. Fri . "Method for producing solid or hollow spherical particles of chosen chemical composition and of uniform size". United States. https://www.osti.gov/servlets/purl/866727.
@article{osti_866727,
title = {Method for producing solid or hollow spherical particles of chosen chemical composition and of uniform size},
author = {Hendricks, Charles D.},
abstractNote = {A method is provided for producing commercially large quantities of high melting temperature solid or hollow spherical particles of a predetermined chemical composition and having a uniform and controlled size distribution. An end (18, 50, 90) of a solid or hollow rod (20, 48, 88) of the material is rendered molten by a laser beam (14, 44, 82). Because of this, there is no possibility of the molten rod material becoming contaminated with extraneous material. In various aspects of the invention, an electric field is applied to the molten rod end (18, 90), and/or the molten rod end (50, 90) is vibrated. In a further aspect of the invention, a high-frequency component is added to the electric field applied to the molten end of the rod (90). By controlling the internal pressure of the rod, the rate at which the rod is introduced into the laser beam, the environment of the process, the vibration amplitude and frequency of the molten rod end, the electric field intensity applied to the molten rod end, and the frequency and intensity of the component added to the electric field, the uniformity and size distribution of the solid or hollow spherical particles (122) produced by the inventive method is controlled. The polarity of the electric field applied to the molten rod end can be chosen to eliminate backstreaming electrons, which tend to produce run-away heating in the rod, from the process.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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