公开(公告)号：US20170266723A1

公开(公告)日：2017-09-21

申请号：US15309947

申请日：2015-05-14

申请人： KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)

发明人： Mitsuhiro SATO ,  Nobuaki AKAGI ,  Hironori SUZUKI

IPC分类号： B22F1/00

CPC分类号： B22F1/0003 ,  B22F1/0014 ,  B22F1/0059 ,  B22F1/02 ,  B22F2003/023 ,  B22F2301/10 ,  B22F2301/35 ,  B22F2302/40 ,  B22F2303/01 ,  B22F2304/10 ,  B22F2998/10 ,  C22C33/02 ,  C22C33/0207 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  B22F3/02 ,  B22F3/10

摘要： An objective of the present invention is to provide a mixed powder for powder metallurgy that makes it possible to improve mold-filling ability and reduce spread in weight of molded bodies. The mixed powder for powder metallurgy according to the present invention is obtained by mixing a graphite powder with an average particle diameter D50 of 1.0 μm or more to 3.0 μm or less and D90 of 10 μm or less, without adding a binder, with an iron-based powder, while applying a sheer force. The thus obtained mixed powder for powder metallurgy according to the present invention is characterized by including the iron-based powder and the graphite powder present so as to be collected in concave portions of the iron-based powder.

公开(公告)号：US20150151361A1

公开(公告)日：2015-06-04

申请号：US14615912

申请日：2015-02-06

申请人： Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

发明人： Hironori SUZUKI

IPC分类号： B22F1/00

CPC分类号： B22F1/0081 ,  B22F1/0059 ,  B22F1/007 ,  B22F2999/00 ,  C22C2026/001 ,  B22F2301/35

摘要： This mixed powder for powder metallurgy, the powder having excellent fluidity and minimal graphite powder scattering, can be obtained relatively conveniently by mixing fine graphite having an average grain diameter of 4 μm or less with an iron based powder. The process is performed without the addition of a binder and while shearing force is applied. It is preferable that the fine graphite have an average grain diameter of 2.4 μm or less and be wet-milled. A portion of the fine graphite is preferably added in place of at least one constituent selected from the group consisting of carbon black, fullerene, carbon compounds carbonized by baking, and graphite having an average grain diameter of 5 μm or more.

摘要翻译： 通过将平均粒径为4μm以下的精细石墨与铁基粉末混合，可以相对方便地获得粉末冶金用混合粉末，具有优异的流动性和最小的石墨粉末散射的粉末。 在不添加粘合剂的同时进行剪切力的过程。 优选的是，微细石墨的平均粒径为2.4μm以下，进行了湿式研磨。 优选添加一部分细石墨来代替选自炭黑，富勒烯，通过焙烧碳化的碳化合物和平均粒径为5μm以上的石墨中的至少一种成分。