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:
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1174595
- Patent Number(s):
- 6,652,822
- Application Number:
- 09/860,016
- Assignee:
- The Regents of the University of California (Los Alamos, NM)
- 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. 2003.
"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 = {},
url = {https://www.osti.gov/biblio/1174595},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 25 00:00:00 EST 2003},
month = {Tue Nov 25 00:00:00 EST 2003}
}
Works referenced in this record:
Low–power plasma torch method for the production of crystalline spherical ceramic particles
journal, May 2001
- Chen, Chun-Ku; Gleiman, Seth; Phillips, Jonathan
- Journal of Materials Research, Vol. 16, Issue 5
Restructuring of alumina particles using a plasma torch
journal, March 1999
- Shim, H.; Phillips, J.; Silva, I. S.
- Journal of Materials Research, Vol. 14, Issue 3