公开(公告)号：JP2002266046A

公开(公告)日：2002-09-18

申请号：JP2001064057

申请日：2001-03-07

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： RO YOSHIICHI ,  HARADA KOJI ,  KOIZUMI YUTAKA ,  KOBAYASHI TOSHIHARU ,  SAKAUCHI HIDENORI

IPC: F01D5/28 ,  C22C27/06

Abstract: PROBLEM TO BE SOLVED: To provide a Cr-base heat-resisting alloy usable, e.g. as a material for moving and stationary blades of a gas turbine, having high-temperature strength equal to or higher than that of an Ni-base alloy and also having excellent room-temperature ductility. SOLUTION: The Cr-base heat-resisting alloy has a composition composed essentially of Cr and containing 1-40 atomic % of either of Re and W or a mixture thereof.

公开(公告)号：JP2003096525A

公开(公告)日：2003-04-03

申请号：JP2001288186

申请日：2001-09-21

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： RO YOSHIICHI ,  MITARAI YOKO ,  HARADA KOJI ,  NAKAZAWA SHIZUO ,  SAKAUCHI HIDENORI

IPC: C22C5/04 ,  C22C19/03

Abstract: PROBLEM TO BE SOLVED: To provide a platinum-iridium alloy which has a compressive strength above that of an Ni based single crystal heat resistant alloy at 1,200 deg.C, and has sufficiently high room temperature toughness. SOLUTION: In a Pt-Ir binary alloy, the content of Ir is >0 to

公开(公告)号：JP2002285260A

公开(公告)日：2002-10-03

申请号：JP2001091137

申请日：2001-03-27

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： MITARAI YOKO ,  TANI TSUKIMINE ,  RO YOSHIICHI ,  NAKAZAWA SHIZUO ,  HARADA KOJI

IPC: F01D5/28 ,  C22C5/04

Abstract: PROBLEM TO BE SOLVED: To provide Ir-Nb alloy having improved creep life which is considered to be a material useful for members for use in high temperature and high stress, such as a jet engine, turbine blades and turbine vane of a gas turbine, and further a space-plane engine, etc. SOLUTION: In the Ir-Nb alloy in which iridium (Ir) is used as a base and niobium (Nb) is added to it and precipitates with Ll2 structure are precipitated in a matrix with fcc structure in a manner to be coherent with the matrix. In this alloy, >=1 atomic % niobium and >=1 atomic % zirconium (Zr) are added and the sum of the additive quantities of niobium and zirconium is made to 10-20 atomic %, and further, this alloy exhibits >=100 hr creep life at >=1,600 deg.C.

公开(公告)号：JP2001303152A

公开(公告)日：2001-10-31

申请号：JP2000120110

申请日：2000-04-20

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： MITARAI YOKO ,  TANI TSUKIMINE ,  RO YOSHIICHI ,  HARADA KOJI

IPC: C22C5/00 ,  C22C5/04

Abstract: PROBLEM TO BE SOLVED: To produce an iridium based cemented carbide which has excellent high temperature strength, or higher strength and in which grain boundaries are strengthened, and intergranular cracking is suppressed. SOLUTION: In the iridium based cemented carbide having a composition consisting of iridium as a base, to which one or more kinds of metals selected from the metallic groups consisting of vanadium, titanium, niobium, tantalum, hafnium and zirconium are added by 2 to 22 atomic %, and in which precipitates having an LI2 structure are comformably precipitated into a base phase having an fcc structure, further, carbon or boron (in the case of boron, by 200 wppm at most) in a trace amount by which a third phase does not appear is added.