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Title: Spherical boron nitride particles and method for preparing them

Abstract

Spherical and polyhedral particles of boron nitride and method of preparing them. Spherical and polyhedral particles of boron nitride are produced from precursor particles of hexagonal phase boron nitride suspended in an aerosol gas. The aerosol is directed to a microwave plasma torch. The torch generates plasma at atmospheric pressure that includes nitrogen atoms. The presence of nitrogen atoms is critical in allowing boron nitride to melt at atmospheric pressure while avoiding or at least minimizing decomposition. The plasma includes a plasma hot zone, which is a portion of the plasma that has a temperature sufficiently high to melt hexagonal phase boron nitride. In the hot zone, the precursor particles melt to form molten particles that acquire spherical and polyhedral shapes. These molten particles exit the hot zone, cool, and solidify to form solid particles of boron nitride with spherical and polyhedral shapes. The molten particles can also collide and join to form larger molten particles that lead to larger spherical and polyhedral particles.

Inventors:
; ;
Issue Date:
Research Org.:
The Regents of the University of California, Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174595
Patent Number(s):
6652822
Application Number:
09/860,016
Assignee:
The Regents of the University of California (Los Alamos, NM)
Patent Classifications (CPCs):
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Phillips, Jonathan, Gleiman, Seth S., and Chen, Chun-Ku. Spherical boron nitride particles and method for preparing them. United States: N. p., 2003. Web.
Phillips, Jonathan, Gleiman, Seth S., & Chen, Chun-Ku. Spherical boron nitride particles and method for preparing them. United States.
Phillips, Jonathan, Gleiman, Seth S., and Chen, Chun-Ku. Tue . "Spherical boron nitride particles and method for preparing them". United States. https://www.osti.gov/servlets/purl/1174595.
@article{osti_1174595,
title = {Spherical boron nitride particles and method for preparing them},
author = {Phillips, Jonathan and Gleiman, Seth S. and Chen, Chun-Ku},
abstractNote = {Spherical and polyhedral particles of boron nitride and method of preparing them. Spherical and polyhedral particles of boron nitride are produced from precursor particles of hexagonal phase boron nitride suspended in an aerosol gas. The aerosol is directed to a microwave plasma torch. The torch generates plasma at atmospheric pressure that includes nitrogen atoms. The presence of nitrogen atoms is critical in allowing boron nitride to melt at atmospheric pressure while avoiding or at least minimizing decomposition. The plasma includes a plasma hot zone, which is a portion of the plasma that has a temperature sufficiently high to melt hexagonal phase boron nitride. In the hot zone, the precursor particles melt to form molten particles that acquire spherical and polyhedral shapes. These molten particles exit the hot zone, cool, and solidify to form solid particles of boron nitride with spherical and polyhedral shapes. The molten particles can also collide and join to form larger molten particles that lead to larger spherical and polyhedral particles.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {11}
}

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Works referenced in this record:

Low–power plasma torch method for the production of crystalline spherical ceramic particles
journal, May 2001


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