公开(公告)号：US20240182301A1

公开(公告)日：2024-06-06

申请号：US18258329

申请日：2021-09-27

Applicant: JFE STEEL CORPORATION

Inventor： Hiroyuki MASUOKA ,  Daisuke TAHARA ,  Akira MATSUZAKI

IPC: C01B21/064 ,  H05H1/46

CPC classification number: C01B21/0648 ,  H05H1/46 ,  C01P2002/76 ,  H05H2242/10

Abstract: Provided is a hexagonal boron nitride powder that can achieve higher thermal conductivity when added as a filler to resin. A plasma treatment method of plasma-treating a hexagonal boron nitride powder under reduced pressure comprises: storing the hexagonal boron nitride powder in a treatment container; supplying a plasma generating gas into the treatment container and maintaining inside of the treatment container at a pressure lower than atmospheric pressure; applying high frequency waves to an electrode installed outside the treatment container while rotating the treatment container about a central axis of the treatment container as a rotation axis in a state in which the rotation axis of the treatment container is inclined with respect to horizontal, to plasma-treat the hexagonal boron nitride powder in the treatment container; and cooling one or both of the treatment container and the electrode during the plasma treatment.

公开(公告)号：US20220380213A1

公开(公告)日：2022-12-01

申请号：US17754370

申请日：2020-09-29

Applicant: JFE STEEL CORPORATION

Inventor： Daisuke TAHARA ,  Hiroyuki MASUOKA ,  Akira MATSUZAKI

IPC: C01B21/064 ,  C08K3/38

Abstract: Provided is a boron nitride powder having excellent adhesion to a resin. The boron nitride powder has a hexagonal structure, has a carboxyl group present on a surface of the boron nitride powder, and has a molar ratio of carboxyl group to nitrogen atom of 0.001 or more on a surface of the boron nitride powder.