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Title: Method to produce large, uniform hollow spherical shells

Abstract

The invention is a method to produce large uniform hollow spherical shells by (1) forming uniform size drops of heat decomposable or vaporizable material, (2) evaporating the drops to form dried particles, (3) coating the dried particles with a layer of shell forming material and (4) heating the composite particles to melt the outer layer and to decompose or vaporize the inner particle to form an expanding inner gas bubble. The expanding gas bubble forms the molten outer layer into a shell of relatively large diameter. By cycling the temperature and pressure on the molten shell, nonuniformities in wall thickness can be reduced. The method of the invention is utilized to produce large uniform spherical shells, in the millimeter to centimeter diameter size range, from a variety of materials and of high quality, including sphericity, concentricity and surface smoothness, for use as laser fusion or other inertial confinement fusion targets as well as other applications.

Inventors:
Issue Date:
OSTI Identifier:
7129319
Application Number:
ON: DE84011286
Assignee:
Dept. of Energy ERA-09-027611; EDB-84-088613
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LASER TARGETS; FABRICATION; MICROSPHERES; HEATING; INERTIAL CONFINEMENT; MELTING; PATENTS; SPECIFICATIONS; THICKNESS; CONFINEMENT; DIMENSIONS; DOCUMENT TYPES; PHASE TRANSFORMATIONS; PLASMA CONFINEMENT; TARGETS; 700205* - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Hendricks, C.D. Method to produce large, uniform hollow spherical shells. United States: N. p., 1983. Web.
Hendricks, C.D. Method to produce large, uniform hollow spherical shells. United States.
Hendricks, C.D. Mon . "Method to produce large, uniform hollow spherical shells". United States.
@article{osti_7129319,
title = {Method to produce large, uniform hollow spherical shells},
author = {Hendricks, C.D.},
abstractNote = {The invention is a method to produce large uniform hollow spherical shells by (1) forming uniform size drops of heat decomposable or vaporizable material, (2) evaporating the drops to form dried particles, (3) coating the dried particles with a layer of shell forming material and (4) heating the composite particles to melt the outer layer and to decompose or vaporize the inner particle to form an expanding inner gas bubble. The expanding gas bubble forms the molten outer layer into a shell of relatively large diameter. By cycling the temperature and pressure on the molten shell, nonuniformities in wall thickness can be reduced. The method of the invention is utilized to produce large uniform spherical shells, in the millimeter to centimeter diameter size range, from a variety of materials and of high quality, including sphericity, concentricity and surface smoothness, for use as laser fusion or other inertial confinement fusion targets as well as other applications.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {9}
}