公开(公告)号：US20190210149A1

公开(公告)日：2019-07-11

申请号：US16324110

申请日：2017-08-04

Applicant: OSAKA UNIVERSITY ,  TOSHIBA MATERIALS CO., LTD.

Inventor： Hidetoshi FUJII ,  Yoshiaki MORISADA ,  Kai FUNAKI ,  Isao IKEDA ,  Yutaka ABE ,  Masahiro KATO

IPC: B23K20/12 ,  C04B35/584 ,  C04B37/02

CPC classification number: B23K20/127 ,  B23K20/12 ,  C04B35/584 ,  C04B37/02

Abstract: The friction stir welding tool member according to the present invention is made of a ceramic member in which a shoulder portion and a probe portion are integrally formed, wherein a root portion of the probe portion and an end portion of the shoulder portion have a curved surface shape; and the friction stir welding tool member has a ratio (R1/D) of 0.02 or more and 0.20 or less when a curvature radius of the end portion of the shoulder portion is defined as R1 (mm) and an outer diameter of the shoulder portion is defined as D (mm). In addition, the ceramic member is preferably made of a silicon nitride sintered body having a Vickers hardness of 1400 HV1 or more. According to the above-described configuration, a friction stir welding tool member having excellent durability can be provided.

公开(公告)号：US20190168337A1

公开(公告)日：2019-06-06

申请号：US16324108

申请日：2017-08-04

Applicant: OSAKA UNIVERSITY ,  TOSHIBA MATERIALS CO., LTD.

Inventor： Hidetoshi FUJII ,  Yoshiaki MORISADA ,  Kai FUNAKI ,  Isao IKEDA ,  Yutaka ABE ,  Masahiro KATO

IPC: B23K20/12 ,  C04B35/587 ,  C04B35/63 ,  C04B35/626 ,  C04B35/645

Abstract: The friction stir welding tool member according to the present invention is made of a silicon nitride sintered body, wherein the silicon nitride sintered body contains 15% by mass or less of additive components except silicon nitride in such a manner that the additive components include at least one element selected from lanthanoid elements and at least one element selected from Mg, Ti, Hf, and Mo. In addition, it is preferable that the additive components further include at least one element selected from Al, Si, and C. According to the above-described configuration, a friction stir welding tool member having an excellent durability can be provided.

公开(公告)号：US20170297141A1

公开(公告)日：2017-10-19

申请号：US15509592

申请日：2015-08-28

Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MATERIALS CO., LTD.

Inventor： Isao IKEDA ,  Kai FUNAKI ,  Yutaka ABE

IPC: B23K20/12 ,  B28B3/00 ,  C04B35/63 ,  C04B35/645 ,  C04B35/587 ,  C04B35/626

Abstract: The present invention provides a welding tool member for friction stir welding comprising a silicon nitride sintered body, wherein the silicon nitride sintered body includes an additive component other than silicon nitride in a content of 15% by mass or less, and the additive component includes three or more elements selected from Y, Al, Mg, Si, Ti, Hf, Mo and C. It is preferable that the content of the additive component is 3% by mass or more and 12.5% by mass or less. It is also preferable that the additive component includes four or more elements selected from Y, Al, Mg, Si, Ti, Hf, Mo and C. Due to above structure, there can be provided a welding tool member for friction stir welding having a high durability.

公开(公告)号：US20180134626A1

公开(公告)日：2018-05-17

申请号：US15564320

申请日：2016-03-28

Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MATERIALS CO., LTD.

Inventor： Isao IKEDA ,  Kai FUNAKI ,  Yutaka ABE

IPC: C04B35/584 ,  C04B35/64 ,  B23K35/36 ,  F16C19/00

Abstract: The present invention provides a silicon nitride sintered body including silicon nitride crystal grains and a grain boundary phase, wherein the silicon nitride crystal grains are covered with the grain boundary phase and width of the grain boundary phase is 0.2 nm or more. It is preferable that the width of the grain boundary phase is 0.2 nm to 5 nm. Additionally, it is preferable that the silicon nitride sintered body includes 15% by mass or less of the grain boundary phase. According to the above-described configuration, it is possible to provide a high-temperature-resistant silicon nitride sintered body in which degradation of the grain boundary phase under high temperature environment is suppressed. This silicon nitride sintered body is suitable for constituent material of a high-temperature-resistant member, use environment of which is 300° C. or higher.