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：JP2002349203A

公开(公告)日：2002-12-04

申请号：JP2001155459

申请日：2001-05-24

Applicant: NAT INST FOR MATERIALS SCIENCE ,  NAT AEROSPACE LAB ,  TOSHIBA CORP

Inventor： HARADA KOJI ,  YOKOGAWA TADAHARU ,  OTAKA SATOKO ,  YOSHIDA TOYOAKI ,  OGAWA AKINORI ,  NOZAKI OSAMU ,  SAEKI YUSHI

IPC: F01D5/18

Abstract: PROBLEM TO BE SOLVED: To provide a virtual turbine calculation method capable of reducing calculation time, continuously and consistently performing blade aerodynamic calculation, blade strength calculation and blade cooling calculation. SOLUTION: In this virtual turbine calculation method, a heat balance is created based on inputted data and information (Step ST2), blade aerodynamic calculation is performed by using data from the heat balance (Step ST3), blade strength is calculated based on a blade shape determined by the blade aerodynamic calculation and material components (Step ST4), blade cooling calculation is performed (Step ST5), and then gas turbine performance and turbine blade specifications are defined (Step ST6).

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.

公开(公告)号：JP2002146460A

公开(公告)日：2002-05-22

申请号：JP2001256449

申请日：2001-08-27

Applicant: NAT INST FOR MATERIALS SCIENCE ,  TOSHIBA CORP

Inventor： HINO TAKEHISA ,  KOIZUMI YUTAKA ,  KOBAYASHI TOSHIHARU ,  NAKAZAWA SHIZUO ,  HARADA KOJI ,  ISHIWATARI YUTAKA ,  YOSHIOKA HIROAKI

IPC: F01D5/28 ,  C22C19/05 ,  C22F1/00 ,  C22F1/10

Abstract: PROBLEM TO BE SOLVED: To obtain a nickel based single crystal superalloy having improved creep strength and structural stability in a high temperature environment, its production method and gas turbine high temperature parts. SOLUTION: This superalloy has a composition containing, by weight, 4.0 to 11.0% cobalt, 3.5 to =4.0%. Also, the total content of renium, molybdenum, tungsten and chromium is

公开(公告)号：JP2003121320A

公开(公告)日：2003-04-23

申请号：JP2001311065

申请日：2001-10-09

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： YAMAMOTO YOSHINOBU ,  MITARAI YOKO ,  HIROSAKI NAOTO ,  HARADA KOJI

IPC: G01N1/28

Abstract: PROBLEM TO BE SOLVED: To provide a method for accurately and simply analyzing an iridium alloy, enabling the melting and chemical analysis of the iridium alloy chemically stable and difficult to melt because of a metal bond. SOLUTION: An alkaline peroxide is added to a powder sample of the iridium alloy to heat and melt the iridium alloy. This molten iridium alloy is dissolved in aqua regia to obtain a solution sample which is, in turn, used to quantify the element in the iridium alloy.

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.