公开(公告)号：US20200339421A1

公开(公告)日：2020-10-29

申请号：US16850737

申请日：2020-04-16

Applicant: TPR CO., LTD.

Inventor： Toshiaki SHIMIZU ,  Shinpei TESHIMA ,  Yasuhiko OKAMURA ,  Yusuke KAWAGUCHI ,  Kazuki OTOMO ,  Yuta KOGUCHI ,  Katsuhito SUZUKI ,  Yoshio BANDO

IPC: C01B32/162

Abstract: Applicability to a composite material with high purity and high strength, and a material requiring high conductivity or high thermal conductivity is enhanced. The present invention relates to a multi-walled carbon nanotube having two or more tubes of a graphene sheet where carbon atoms are arranged in a hexagonal honeycomb form, coaxially, wherein a diameter of an outermost wall based on observation of an image by a transmission electron microscope is 3 nm or more and 15 nm or less, and a length based on observation of an image of a scanning electron microscope is 1.0 mm or more, an aggregate of multi-walled carbon nanotubes and a method for preparing the multi-walled carbon nanotube.

公开(公告)号：US20200165945A1

公开(公告)日：2020-05-28

申请号：US16627682

申请日：2018-10-23

Applicant: TPR CO., LTD.

Inventor： Yoshio BANDO ,  Fumiya ITO ,  Kenichi HARASHINA

IPC: F01L3/08 ,  B22F3/16 ,  C22C38/16 ,  B22F1/02

Abstract: Provided are a valve guide made of an iron-based sintered alloy excellent in wear resistance and thermal conductivity, and a method of producing the same. Specifically, provided are a method of producing a valve guide made of an iron-based sintered alloy, the method including the steps of: molding raw material powder including diffusion-alloyed powder including core iron powder and Cu bonded to the core iron powder through diffusion to obtain a molded body; and sintering the molded body, to thereby produce a valve guide made of an iron-based sintered alloy, and a valve guide produced by the production method.