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Title: Boron nitride composites

Abstract

According to one embodiment, a composite product includes: a matrix material including hexagonal boron nitride and one or more borate binders; and a plurality of cubic boron nitride particles dispersed in the matrix material. According to another embodiment, a composite product includes: a matrix material including hexagonal boron nitride and amorphous boron nitride; and a plurality of cubic boron nitride particles dispersed in the matrix material.

Inventors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1344506
Patent Number(s):
9,573,249
Application Number:
14/946,606
Assignee:
Lawrence Livermore National Security, LLC LLNL
DOE Contract Number:
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Nov 19
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Kuntz, Joshua D., Ellsworth, German F., Swenson, Fritz J., and Allen, Patrick G.. Boron nitride composites. United States: N. p., 2017. Web.
Kuntz, Joshua D., Ellsworth, German F., Swenson, Fritz J., & Allen, Patrick G.. Boron nitride composites. United States.
Kuntz, Joshua D., Ellsworth, German F., Swenson, Fritz J., and Allen, Patrick G.. Tue . "Boron nitride composites". United States. doi:. https://www.osti.gov/servlets/purl/1344506.
@article{osti_1344506,
title = {Boron nitride composites},
author = {Kuntz, Joshua D. and Ellsworth, German F. and Swenson, Fritz J. and Allen, Patrick G.},
abstractNote = {According to one embodiment, a composite product includes: a matrix material including hexagonal boron nitride and one or more borate binders; and a plurality of cubic boron nitride particles dispersed in the matrix material. According to another embodiment, a composite product includes: a matrix material including hexagonal boron nitride and amorphous boron nitride; and a plurality of cubic boron nitride particles dispersed in the matrix material.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 21 00:00:00 EST 2017},
month = {Tue Feb 21 00:00:00 EST 2017}
}

Patent:

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  • Boron nitride--boron nitride composite bodies may be produced by combining pure boron nitride fibers with partially nitrided fibers consisting essentially of B, N, O, and H, and hot pressing the composite at elevated temperatures and pressure. The partially nitrided material serves as a source of matrix material for the boron nitride fibers; and, when fiber orientation is properly controlled, bodies of extremely high strength may be obtained. Densities in excess of 1.5 g/cm/sup 3/ may be obtained in a one-step process which overcomes difficulties inherent in multiple-step nitriding and renitriding processes. 1 table.
  • A fiber-reinforced silicon-silicon carbide matrix composite having improved oxidation resistance at high temperatures in dry or water-containing environments is produced. The invention also provides a method for protecting the reinforcing fibers in the silicon-silicon carbide matrix composites by coating the fibers with a silicon-doped boron nitride coating.
  • This patent describes a ceramic composite comprising a mixture of boron nitride and fused zirconia mullite. The fused zirconia mullite comprising from 25 to 45 weight percent zirconia and from 55 to 75 weight percent mullite based on the weight of the fused zirconia mullite, and the ceramic composite comprising from 26 to 90 weight percent boron nitride and from 10 to 74 weight percent fused zirconia mullite based on the weight of the ceramic composite.
  • This patent describes a composite produced by heating and compressing a mixture of particulate alumina and boron nitride. The composite consists essentially of between about 50 and about 90 weight percent alumina having a purity of at least 99.90 weight percent, and between about 10 to about 50 weight percent boron nitride having a purity of at least 99 weight percent. The composite has a density not more than about 93% of the theoretical density, and a Rockwell R hardness less than 130.
  • A fiber-reinforced silicon--silicon carbide matrix composite having improved oxidation resistance at high temperatures in dry or water-containing environments is produced. The invention also provides a method for protecting the reinforcing fibers in the silicon--silicon carbide matrix composites by coating the fibers with a silicon-doped boron nitride coating.