Method for producing small hollow spheres

Rosencwaig, Allen; Koo, Jackson C; Dressler, John L

Title: Method for producing small hollow spheres

Full Record
Other Related Research

Abstract

A method for producing small hollow spheres of glass having an outer diameter ranging from about 100.mu. to about 500.mu. with a substantially uniform wall thickness in the range of about 0.5-20.mu.. The method involves introducing aqueous droplets of a glass-forming solution into a long vertical drop oven or furnace having varying temperature regions. In one embodiment, one of the temperature regions is lower than both the preceeding region and the subsequent region. One region utilizes a temperature of at least 200.degree. C. higher than the melting point of the glass-forming material in the solution and, for example, may be at least 3 times higher than the temperature of the preceeding region. In addition, there is a sharp temperature gradient between these regions. As each droplet of solution passes through a first region it forms into a gel membrane having a spherical shape and encapsulates the rest of the drop retained in the elastic outer surface and the water entrapped within diffuses rapidly through the thin gel membrane which causes more of the glass-forming material to go out of solution and is incorporated into the gel membrane causing it to grow in size and become hollow. thus produced hollow glassmore »« less

Inventors:

Rosencwaig, Allen ^[1]; Koo, Jackson C ^[2]; Dressler, John L ^[3]

Danville, CA
San Ramon, CA
Spring Valley, OH

Issue Date:: 1981-01-01

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

OSTI Identifier:: 863834

Patent Number(s):: 4257799

Assignee:: United States of America as represented by United States (Washington, DC)

Patent Classifications (CPCs):: C - CHEMISTRY C03 - GLASS C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Show more

C - CHEMISTRY C03 - GLASS C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS
C03C3/089 - containing boron

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10S376/916 - Methods of making fusion fuel targets

C - CHEMISTRY C03 - GLASS C03C - CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS
C03C11/002 - {Hollow glass particles}

C - CHEMISTRY C03 - GLASS C03B - MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
C03B19/1065 - {by liquid phase reactions, e.g. by means of a gel phase}
C03B19/1075 - {by blowing, pressing, centrifuging, rolling or dripping}

Show less

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: method; producing; hollow; spheres; glass; outer; diameter; ranging; 100; 500; substantially; uniform; wall; thickness; range; 5-20; involves; introducing; aqueous; droplets; glass-forming; solution; vertical; drop; oven; furnace; varying; temperature; regions; embodiment; preceeding; region; subsequent; utilizes; 200; degree; melting; material; example; times; addition; sharp; gradient; droplet; passes; forms; membrane; spherical; shape; encapsulates; retained; elastic; surface; water; entrapped; diffuses; rapidly; causes; incorporated; causing; grow; size; produced; sphere; sphericity; concentricity; uniformity; capable; retaining; atmospheres; therein; periods; time; spherical shape; hollow spheres; wall thickness; temperature gradient; method involves; outer surface; substantially uniform; hollow glass; outer diameter; produced hollow; forming material; uniform wall; method involve; hollow sphere; solution pass; /65/264/376/501/

Citation Formats


                    Rosencwaig, Allen, Koo, Jackson C, and Dressler, John L. Method for producing small hollow spheres.  United States: N. p., 1981. 
        Web.

Copy to clipboard


                    Rosencwaig, Allen, Koo, Jackson C, & Dressler, John L. Method for producing small hollow spheres.  United States.

Copy to clipboard


                    Rosencwaig, Allen, Koo, Jackson C, and Dressler, John L. Thu .  
        "Method for producing small hollow spheres".  United States.  https://www.osti.gov/servlets/purl/863834.

Copy to clipboard


                    
@article{osti_863834,

  title        = {Method for producing small hollow spheres},

  author       = {Rosencwaig, Allen and Koo, Jackson C and Dressler, John L},

  abstractNote = {A method for producing small hollow spheres of glass having an outer diameter ranging from about 100.mu. to about 500.mu. with a substantially uniform wall thickness in the range of about 0.5-20.mu.. The method involves introducing aqueous droplets of a glass-forming solution into a long vertical drop oven or furnace having varying temperature regions. In one embodiment, one of the temperature regions is lower than both the preceeding region and the subsequent region. One region utilizes a temperature of at least 200.degree. C. higher than the melting point of the glass-forming material in the solution and, for example, may be at least 3 times higher than the temperature of the preceeding region. In addition, there is a sharp temperature gradient between these regions. As each droplet of solution passes through a first region it forms into a gel membrane having a spherical shape and encapsulates the rest of the drop retained in the elastic outer surface and the water entrapped within diffuses rapidly through the thin gel membrane which causes more of the glass-forming material to go out of solution and is incorporated into the gel membrane causing it to grow in size and become hollow. thus produced hollow glass sphere has a sphericity, concentricity, and wall uniformity of better than 5%. The sphere is capable of retaining material of up to at least 100 atmospheres therein over long periods of time. In one embodiment.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1981},

  month        = {1}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE Patents and OSTI.GOV collections:

Method for producing small hollow spheres

Patent Hendricks, Charles D. [Livermore, CA]

Method for producing small hollow spheres of glass, metal or plastic, wherein the sphere material is mixed with or contains as part of the composition a blowing agent which decomposes at high temperature (T .gtorsim. 600.degree. C). As the temperature is quickly raised, the blowing agent decomposes and the resulting gas expands from within, thus forming a hollow sphere of controllable thickness. The thus produced hollow spheres (20 to 10.sup.3 .mu.m) have a variety of application, and are particularly useful in the fabrication of targets for laser implosion such as neutron sources, laser fusion physics studies, and laser initiated fusionmore » power plants.« less
Full Text Available
Method and apparatus for producing small hollow spheres

Patent Hendricks, Charles D [Livermore, CA]

Method and apparatus for producing small hollow spheres of glass, metal or plastic, wherein the sphere material is mixed with or contains as part of the composition a blowing agent which decomposes at high temperature (T.gtoreq.600.degree. C.). As the temperature is quickly raised, the blowing agent decomposes and the resulting gas expands from within, thus forming a hollow sphere of controllable thickness. The thus produced hollow spheres (20 to 10.sup.3 .mu.m) have a variety of application, and are particularly useful in the fabrication of targets for laser implosion such as neutron sources, laser fusion physics studies, and laser initiated fusionmore » power plants.« less
Full Text Available
Method for producing solid or hollow spherical particles of chosen chemical composition and of uniform size

Patent Hendricks, Charles D [Livermore, CA]

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)more »« less
Full Text Available
Method to produce large, uniform hollow spherical shells

Patent Hendricks, Charles D [Livermore, CA]

Large, uniform hollow spherical shells are produced by forming uniform size drops of heat decomposable or vaporizable material, evaporating the drops to form dried particles, coating the dried particles with a layer of shell forming material, and heating the composite particles to melt the outer layer and decompose or vaporize the inner particle to form an expanding inner gas bubble which expands the outer layer. By cycling the temperature and pressure on the hollow shells, spherical shells with uniform walls are produced.
Full Text Available
Method for producing dustless graphite spheres from waste graphite fines

Patent Pappano, Peter J [Oak Ridge, TN]; Rogers, Michael R [Clinton, TN]

A method for producing graphite spheres from graphite fines by charging a quantity of spherical media into a rotatable cylindrical overcoater, charging a quantity of graphite fines into the overcoater thereby forming a first mixture of spherical media and graphite fines, rotating the overcoater at a speed such that the first mixture climbs the wall of the overcoater before rolling back down to the bottom thereby forming a second mixture of spherical media, graphite fines, and graphite spheres, removing the second mixture from the overcoater, sieving the second mixture to separate graphite spheres, charging the first mixture back into themore »« less
Full Text Available

Similar Records