公开(公告)号：US20230146575A1

公开(公告)日：2023-05-11

申请号：US17907515

申请日：2021-03-26

Applicant: Denka Company Limited

Inventor： Koki IKARASHI ,  Nobuya SUZUKI ,  Koji NISHIMURA ,  Makoto TAKEDA ,  Seiji KOBASHI

IPC: C04B35/583 ,  C04B35/628 ,  C04B35/63 ,  C04B35/64 ,  C04B41/83 ,  C04B41/48 ,  C04B41/00

CPC classification number: C04B35/583 ,  C04B35/62884 ,  C04B35/62836 ,  C04B35/6303 ,  C04B35/64 ,  C04B41/83 ,  C04B41/4853 ,  C04B41/0072 ,  C04B2235/386 ,  C04B2235/3856 ,  C04B2235/3409 ,  C04B2235/442 ,  C04B2235/5436 ,  C04B2235/963

Abstract: Provided is a boron nitride sintered body having a porous structure, the boron nitride sintered body including a lump particle formed by aggregation of primary particles of boron nitride and having a particle diameter of 15 μm or more. Provided is a method for manufacturing a boron nitride sintered body, the method including: a nitriding step of firing a raw material powder containing boron carbide in an atmosphere containing nitrogen to obtain a fired product including lump particles each having a core part with primary particles of boron carbonitride aggregated and a shell part surrounding the core part; and a firing step of molding and heating a blend containing the fired product including lump particles and a sintering aid to obtain the boron nitride sintered body having a porous structure and including lump particles of boron nitride.

公开(公告)号：US20230150886A1

公开(公告)日：2023-05-18

申请号：US17906772

申请日：2021-03-30

Applicant: Denka Company Limited

Inventor： Makoto TAKEDA ,  Koki IKARASHI

IPC: C04B35/583 ,  C04B41/48 ,  C04B41/50

CPC classification number: C04B35/583 ,  C04B41/48 ,  C04B41/5093 ,  C04B2235/77 ,  C04B2235/386

Abstract: Provided is a boron nitride sintered body including boron nitride particles and pores, in which a compressive elastic modulus is 1 GPa or more. Provided is a method for manufacturing a boron nitride sintered body, the method including: a nitriding step of firing a boron carbide powder in a nitrogen atmosphere to obtain a fired product containing boron carbonitride; and a sintering step of molding and heating a blend containing the fired product and a sintering aid to obtain the boron nitride sintered body including boron nitride particles and pores, in which the sintering aid contains a boron compound and a calcium compound, and the blend contains 1 to 20 parts by mass of the boron compound and the calcium compound in total with respect to 100 parts by mass of the fired product.

公开(公告)号：US20230142330A1

公开(公告)日：2023-05-11

申请号：US17908817

申请日：2021-03-26

Applicant: Denka Company Limited

Inventor： Koki IKARASHI ,  Makoto TAKEDA ,  Seiji KOBASHI ,  Koji NISHIMURA

IPC: C04B41/48 ,  C09K5/14 ,  C04B35/583 ,  C04B35/63 ,  C04B35/64 ,  C04B38/00 ,  C04B41/83

CPC classification number: C04B41/4853 ,  C09K5/14 ,  C04B35/583 ,  C04B35/6303 ,  C04B35/64 ,  C04B38/0054 ,  C04B41/83 ,  C04B2235/386 ,  C04B2235/3409 ,  C04B2235/442 ,  C04B2235/5436 ,  C04B2235/6567 ,  C04B2235/77 ,  H05K1/0373

Abstract: Provided is a boron nitride sintered body including: a plurality of coarse particles each having a length of 20 μm or more; and fine particles smaller than the plurality of coarse particles, in which, when viewed in a cross-section, the plurality of coarse particles intersect with each other. Provided is a method for manufacturing a boron nitride sintered body, the method including: a raw material preparation step of firing a mixture containing boron carbonitride and a boron compound in a nitrogen atmosphere to obtain lump boron nitride having an average particle diameter of 10 to 200 μm; and a sintering step of molding and heating a blend containing the lump boron nitride and a sintering aid to obtain a boron nitride sintered body including coarse particles each having a length of 20 μm or more in a cross-section and fine particles smaller than the coarse particles.

公开(公告)号：US20230085806A1

公开(公告)日：2023-03-23

申请号：US17908786

申请日：2021-03-26

Applicant: Denka Company Limited

Inventor： Koki IKARASHI ,  Makoto TAKEDA ,  Seiji KOBASHI ,  Koji NISHIMURA

IPC: C04B35/583 ,  C04B41/48 ,  C04B41/83

Abstract: Provided is a boron nitride sintered body including boron nitride particles and pores, the boron nitride sintered body having a sheet shape and a thickness of less than 2 mm. Provided is a method for manufacturing a boron nitride sintered body, the method including a sintering step of molding and heating a blend containing a boron carbonitride powder and a sintering aid to obtain a sheet-shaped boron nitride sintered body including boron nitride particles and pores, in which a thickness of the boron nitride sintered body obtained in the sintering step is less than 2 mm.

公开(公告)号：US20220177376A1

公开(公告)日：2022-06-09

申请号：US17441772

申请日：2020-03-26

Applicant: Denka Company Limited

Inventor： Shoji IWAKIRI ,  Makoto TAKEDA ,  Shinichi TAKADA

IPC: C04B35/584 ,  H01L23/373 ,  H01L21/48

Abstract: Provided is a method for producing a silicon nitride sintered body including: a step of molding and firing a raw material powder containing silicon nitride, in which an α-conversion rate of the silicon nitride contained in the raw material powder is less than or equal to 30 mass %. A thermal conductivity (at 20° C.) of the silicon nitride sintered body exceeds 100 W/m·K and a fracture toughness (KIC) is greater than or equal to 7.4 MPa·m1/2.