| 摘要 |
<p>The present invention provides a process for continuously producing crystalline hexagonal boron nitride powder having a large particle size and high crystalline at higher efficiency, lower cost and reduction of contamination inside the furnace. The present invention relates to a process for continuously producing crystalline hexagonal boron nitride powder comprising: the first step of heating a boron-containing material and a nitrogen-containing material to obtain crude boron nitride powder having boron nitride content of 80 % by weight or higher, and the second step of feeding the crude boron nitride powder and a boron-containing flux component in the content satisfying the following formula (1) with a heat-resistant container, and heating the container including the crude boron nitride powder and the boron-containing flux component at 1550 to 2400 °C in a continuous furnace under the atmosphere of nitrogen gas, to grow hexagonal boron nitride in the form of crystal.</p> |
