公开(公告)号：US11224914B2

公开(公告)日：2022-01-18

申请号：US16613122

申请日：2018-06-12

Applicant: JFE STEEL CORPORATION

Inventor： Shigeru Unami ,  Masato Oya

IPC: C08K3/11 ,  B22F1/00 ,  C08K3/04 ,  C22C33/02

Abstract: The powder mixture for powder metallurgy includes a raw material powder, a binder, and a graphite powder, where the raw material powder contains an iron-based powder in a content of 90 mass % or more of the raw material powder, the graphite powder has an average particle size of less than 5 μm, a ratio in mass of the binder to the sum the raw material powder and the graphite powder is 0.10 mass % to 0.80 mass %, a ratio of mass of the graphite powder to the sum of mass of the raw material powder and mass of the graphite powder is 0.6 mass % to 1.0 mass %, surface of the raw material powder is covered with at least a part of the binder, and surface of the binder covering the surface of the raw material powder is covered with at least a part of the graphite powder.

公开(公告)号：US11946119B2

公开(公告)日：2024-04-02

申请号：US17059210

申请日：2019-04-22

Applicant: JFE STEEL CORPORATION

Inventor： Masato Oya ,  Shigeru Unami

IPC: C08K3/04 ,  B22F1/05 ,  B22F1/052 ,  B22F1/10 ,  B22F1/102 ,  B22F1/103 ,  B22F1/16 ,  B22F1/17 ,  B22F3/08 ,  C08K3/08 ,  C22C33/02

CPC classification number: C22C33/0264 ,  B22F1/05 ,  B22F1/052 ,  B22F1/10 ,  B22F1/102 ,  B22F1/103 ,  B22F1/108 ,  B22F1/16 ,  B22F1/17 ,  C08K3/04 ,  C08K3/08 ,  B22F2301/10 ,  B22F2302/40 ,  B22F2302/45 ,  B22F2304/10 ,  C08K2003/085 ,  C08K2003/0856 ,  C08K2201/005

Abstract: Provided is a powder mixture for powder metallurgy that has excellent fluidity, can be ejected from a green compacting die with little force, and can suppress die galling in forming. The powder mixture comprises: a raw material powder; a copper powder; a binder; a graphite powder; and carbon black. The raw material powder contains an iron-based powder in an amount of 90 mass % or more with respect to the raw material powder. An average particle size of the graphite powder is less than 5 μm. Additive amounts of the binder, the graphite powder, the copper powder, and the carbon black are in specific ranges. A surface of the raw material powder is coated with at least part of the binder. A surface of the binder is coated with at least part of the graphite powder, at least part of the copper powder, and at least part of the carbon black.