公开(公告)号：DE10349594A1

公开(公告)日：2004-05-13

申请号：DE10349594

申请日：2003-10-24

Applicant: DENSO CORP

Inventor： SUZUKI YASUYOSHI ,  NOMURA YURIO ,  NISHIJIMA YOSHIAKI ,  MIYAKE SHOJI ,  MAKINO YUKIO ,  SATOH TEPPEI

IPC: B22F1/00 ,  B22F1/02 ,  B22F3/105 ,  C22C33/02 ,  H01F41/02 ,  H01F1/22 ,  H01F1/33

Abstract: The invention provides a method for preparing a soft magnetic material which meets demands for low iron loss, high density, high strength and high productivity. The method comprises a surface oxidation step of forming oxide films on the surfaces of a soft magnetic powder, a step of preparing a molding compound of the soft magnetic powder by mixing a soft magnetic powder and a binder with a predetermined blending ratio, a press molding step of press-molding the molding compound of the soft magnetic powder into a predetermined shape, and a sintering step of sintering the press-molded soft magnetic powder to produce a soft magnetic material, wherein a millimeter wave sintering apparatus or a discharge plasma sintering apparatus is used as a heating means in the surface oxidation step or in the sintering step. Thereby, energy of millimeter waves or discharge plasma acts locally on oxidized surface portions having a large electric resistance of the soft magnetic powder, the surfaces of the soft magnetic powder are locally heated at a temperature near the melting point, and oxidation of the surfaces of the soft magnetic powder (formation of an oxide film) and sintering (diffusional joining between oxide films) are promoted.

公开(公告)号：JP2004162174A

公开(公告)日：2004-06-10

申请号：JP2003312303

申请日：2003-09-04

Applicant: Denso Corp ,  株式会社デンソー

Inventor： SUZUKI YASUYOSHI ,  NOMURA YURIO ,  NISHIJIMA YOSHIAKI ,  MIYAKE MASAJI ,  MAKINO YUKIO ,  SATO TEPPEI

IPC: B22F1/00 ,  B22F1/02 ,  B22F3/105 ,  C22C33/02 ,  H01F41/02

CPC classification number: B22F3/105 ,  B22F1/0088 ,  B22F2999/00 ,  H01F41/0246 ,  B22F2202/11 ,  B22F2202/13

Abstract: PROBLEM TO BE SOLVED: To produce a soft magnetic material which satisfies requirements including a low iron loss, a high density, high strengths, and a high productivity on a high level.
SOLUTION: The method for producing the soft magnetic material comprises the surface oxidation step of forming an oxide film on the surface of the surface of a powder of the soft magnetic material, the step of mixing the soft magnetic powder with a binder in a specified mixing ratio to make a moldable soft magnetic material, the press molding step of press-molding the moldable soft magnetic material into a specified shape, and the sintering step of sintering the press-molded soft magnetic powder to produce the soft magnetic material. In the surface oxidation step and the sintering step, a millimeter wave sintering apparatus (or a discharge plasma sintering apparatus) is used as a heating means. Then, the energy of the millimeter waves (or the discharge plasma) locally acts on the surface oxide part where the soft magnetic powder exhibits a high electric resistivity and locally heats the surface of the soft magnetic powder to a temperature near the melting temperature to accelerate the surface oxidation (oxide film formation) of the soft magnetic powder and sintering (diffusion and joint of oxide films).
COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：为了生产出一种满足低铁损，高密度，高强度和高生产率的要求的软磁性材料。 解决方案：软磁性材料的制造方法包括在软磁性材料的粉末表面的表面形成氧化膜的表面氧化工序，软磁性粉末与粘合剂的混合工序 规定的混合比，制成可成形的软磁性材料，将可成形软磁性材料压制成规定形状的压制成形工序，以及烧结加压成形的软磁性粉末以形成软磁性体的烧结工序。 在表面氧化步骤和烧结步骤中，使用毫米波烧结装置（或放电等离子体烧结装置）作为加热装置。 然后，毫米波（或放电等离子体）的能量局部地作用在软磁性粉末表现出高电阻率的表面氧化物部分上，并将软磁性粉末的表面局部加热至接近熔融温度的温度，以加速 软磁粉末的表面氧化（氧化膜形成）和烧结（氧化膜的扩散和接合）。 版权所有（C）2004，JPO