SPHERICAL BORON NITRIDE PARTICLES AND PRODUCTION METHOD THEREOF

WIPO Patent Application WO/2015/122379

A1

[Problem] To provide spherical boron nitride particles which have a high sphericity and are suitable as a highly thermoconductive filler, and to provide a production method of said particles. [Solution] These spherical boron nitride particles have an average particle diameter of 0.01-1.0μm, an orientation index of 1-15, a boron nitride purity of 98.0 mass% or greater and an average circularity of 0.80 or greater; this production method of said spherical boron nitride particles involves reacting boric acid alkoxide and ammonia with an ammonia/boric acid alkoxide molar ratio of 1-10 in an inert gas stream at 750°C or higher for 30 seconds or less, thereafter performing heat treatment in an atmosphere of ammonia gas or a gas mixture of ammonia gas and an inert gas at 1,000-1,600°C for at least 1 hour, and further firing in an inert gas atmosphere at 1,800-2,200°C for at least 0.5 hours.

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KUROKAWA FUMIHIRO (JP)
KOBAYASHI SEITARO (JP)
KAWASAKI TAKASHI (JP)
TAKEDA GO (JP)
BANDO YOSHIO (JP)
GORBERG DMITRI (JP)

PCT/JP2015/053489

August 20, 2015

February 09, 2015

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DENKI KAGAKU KOGYO KK (JP)
NAT INST FOR MATERIALS SCIENCE (JP)

C01B21/064

WO2011043082A1

2011-04-14

JP2010180066A	2010-08-19
JP2008266101A	2008-11-06
JP2004182572A	2004-07-02
JPH0442897A	1992-02-13
JPH08290905A	1996-11-05

CHENGCHUN TANG ET AL.: "Synthetic routes and formation mechanisms of spherical boron nitride nanoparticles", ADVANCED FUNCTIONAL MATERIALS, vol. 18, no. 22, 24 November 2008 (2008-11-24), pages 3653 - 3661, XP001517179

MATSUMOTO SATORU (JP)
Matsumoto 悟 (JP)

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