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 »
- Inventors:
-
- Livermore, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 866727
- Patent Number(s):
- 4774037
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
- 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 = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}