US 6,348,179 B1 · Spherical boron nitride process, system and product of manufacture

Abstract

The present invention involves a process and system for producing spherical BNxOy particles that are converted to crystalline BN. The process involves adding a boron compound to an aqueous solution, creating an aerosol spray from the solution in the form of aerosol droplets using an aerosol generator. The aerosol droplets are fed with an inert carrier gas into a heated furnace at a preset flow rate while simultaneously injecting a gaseous nitriding agent into the heated furnace in a direct proportion to the flow rate of the carrier gas containing the aerosol droplets whereby a precursor of spherically shaped BNxOy particles are formed which are further heat treated into particles of spherically shaped BN having a turbostratic or hexagonal structure.

Claims16

Dependent claims

A method for forming spherically shaped BNxOy precursor particles comprising the steps of:

a) dissolving a boron compound into an aqueous solution,
b) forming aerosol droplets from said boron containing aqueous solution;
c) combining said aerosol droplets with an inert carrier gas to form a combined gas stream of said inert carrier gas and said aerosol droplets at a predetermined flow rate;
d) feeding said combined gas stream at said predetermined flow rate into a furnace,
e) maintaining the temperature in said furnace at a temperature of 600° C. to about 1500° C.;
and
f) injecting a gaseous nitriding agent into said furnace simultaneously with the injection of the combined aerosol gas stream whereby substantially spherically shaped BNxOy precursor particles are formed in said furnace.

4 more elements

Dependencies are inferred from the claim text.

Spherical boron nitride process, system and product of manufacture

Life of this patent

Spherical boron nitride process, system and product of manufacture

Life of this patent

Abstract

Claims16