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Title: Method for producing ceramic particles and agglomerates

Abstract

A method for generating spherical and irregularly shaped dense particles of ceramic oxides having a controlled particle size and particle size distribution. An aerosol containing precursor particles of oxide ceramics is directed into a plasma. As the particles flow through the hot zone of the plasma, they melt, collide, and join to form larger particles. If these larger particles remain in the hot zone, they continue melting and acquire a spherical shape that is retained after they exit the hot zone, cool down, and solidify. If they exit the hot zone before melting completely, their irregular shape persists and agglomerates are produced. The size and size distribution of the dense product particles can be controlled by adjusting several parameters, the most important in the case of powder precursors appears to be the density of powder in the aerosol stream that enters the plasma hot zone. This suggests that particle collision rate is responsible for determining ultimate size of the resulting sphere or agglomerate. Other parameters, particularly the gas flow rates and the microwave power, are also adjusted to control the particle size distribution.

Inventors:
 [1];  [1];  [2]
  1. Santa Fe, NM
  2. Albuquerque, NM
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
873855
Patent Number(s):
6261484
Assignee:
Regents of University of California (Los Almos, NM)
Patent Classifications (CPCs):
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; producing; ceramic; particles; agglomerates; generating; spherical; irregularly; shaped; dense; oxides; controlled; particle; size; distribution; aerosol; containing; precursor; oxide; ceramics; directed; plasma; flow; hot; zone; melt; collide; join; form; larger; remain; melting; acquire; shape; retained; exit; cool; solidify; completely; irregular; persists; produced; product; adjusting; parameters; powder; precursors; appears; density; stream; enters; suggests; collision; rate; responsible; determining; ultimate; resulting; sphere; agglomerate; particularly; gas; rates; microwave; power; adjusted; control; ceramic oxides; collision rate; irregularly shaped; spherical shape; hot zone; size distribution; flow rates; ceramic particles; gas flow; flow rate; particle size; microwave power; oxide ceramic; ceramic oxide; ceramic particle; larger particles; particles remain; form larger; controlled particle; producing ceramic; powder precursors; powder precursor; aerosol stream; dense particles; irregular shape; /264/

Citation Formats

Phillips, Jonathan, Gleiman, Seth S, and Chen, Chun-Ku. Method for producing ceramic particles and agglomerates. United States: N. p., 2001. Web.
Phillips, Jonathan, Gleiman, Seth S, & Chen, Chun-Ku. Method for producing ceramic particles and agglomerates. United States.
Phillips, Jonathan, Gleiman, Seth S, and Chen, Chun-Ku. Mon . "Method for producing ceramic particles and agglomerates". United States. https://www.osti.gov/servlets/purl/873855.
@article{osti_873855,
title = {Method for producing ceramic particles and agglomerates},
author = {Phillips, Jonathan and Gleiman, Seth S and Chen, Chun-Ku},
abstractNote = {A method for generating spherical and irregularly shaped dense particles of ceramic oxides having a controlled particle size and particle size distribution. An aerosol containing precursor particles of oxide ceramics is directed into a plasma. As the particles flow through the hot zone of the plasma, they melt, collide, and join to form larger particles. If these larger particles remain in the hot zone, they continue melting and acquire a spherical shape that is retained after they exit the hot zone, cool down, and solidify. If they exit the hot zone before melting completely, their irregular shape persists and agglomerates are produced. The size and size distribution of the dense product particles can be controlled by adjusting several parameters, the most important in the case of powder precursors appears to be the density of powder in the aerosol stream that enters the plasma hot zone. This suggests that particle collision rate is responsible for determining ultimate size of the resulting sphere or agglomerate. Other parameters, particularly the gas flow rates and the microwave power, are also adjusted to control the particle size distribution.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

Works referenced in this record:

Restructuring of alumina particles using a plasma torch
journal, March 1999