Composite particles of boric acid melamine and boron nitride , and a manufacturing method of the boron nitride particles using the same . .

摘要

PROBLEM TO BE SOLVED: To provide boron nitride particles excellent in thermal conductivity, and a method for producing the same.SOLUTION: A composite particle having a 40-300 μm average particle size comprises melamine borate, and scale-like boron nitride powder having a ≤2.0 graphitization index (GI) by a powder X-ray diffraction method and a 5-40 μm average particle size. In a method for producing composite particles, spray granulation is performed by using slurry containing a 10-50 pts.mass mixture having 1.0-20 pts.mass scale-like boron nitride to 100 pts.mass melamine borate, with respect to 100 pts.mass aqueous solution containing a 0.05-1.0 mass% organic binder. In a method for producing boron nitride particles, the composite particles are fired at 600-1,300°C in a non-oxidative atmosphere, and then fired again at 1,600-2,200°C in the non-oxidative atmosphere.