Ihi Corporation

Mitsubishi Denki Kabushiki Kaisha

National Institute for Materials Science

Ishikawajima-harima Heavy Industries Co., Ltd.

Independent Administrative Institution National Institute for Materials Science

Mikiya Arai

Yasuhiro Aoki

Shoju Masaki

Akihiro Goto

Hiroshi Harada

Masao Akiyoshi

Mitsutoshi Watanabe

Hiroyuki Ochiai

Toshiharu Kobayashi

Yutaka Koizumi

Tadaharu Yokokawa

Kazuyoshi Chikugo

Shigeru Saburi

Akihiro Sato

Eiji Nakayama

Kyoko Kawagishi

Ryoji Kakiuchi

Nobuhito Sekine

Tsuyoshi Yamakawa

Shogo Tsugumi

Jun Sakai

Tsunao Tezuka

A Ni-based single crystal superalloy which has the following composition: Co: 4.0 to 9.5 wt %, Cr: 5.1 to 8.0 wt %, Mo: 2.1 to 3.5 wt %, W: 0.0 to 2.9 wt %, Ta: 4.0 to 10.0 wt %, Al: 4.5 to 6.5 wt %, Ti: 0.0 to 1.0 wt %, Hf: 0.08 to 0.5 wt %, Nb: 0.0 to 3.0 wt %, Re: 4.5 to 8.0 wt % and Ru: 0.5 to 6.5 wt % with the remainder including Ni and unavoidable impurities, wherein P1&#x2266;700 is satisfied in which P1 represents a parameter 1, which is obtained by a formula: P1=137&#xd7;[W (wt %)]+24&#xd7;[Cr (wt %)]+46&#xd7;[Mo (wt %)]&#x2212;18&#xd7;[Re (wt %)].

Ni-based single crystal superalloy and turbine blade incorporating the same

A sliding surface of a high-temperature portion is subjected to an electro-discharge surface treatment with one or both of a high-temperature hard material () and a material having a lubricating property at a high temperature (). The high-temperature hard material () is any or a mixture of cBN, TiC, TiN, TiAlN, TiB, WC, CrC, SiC, ZrC, VC, BC, SiN, ZrO, and AlO. The material having the lubricating property at the high temperature () contains chromium and/or chromium oxide (CrO) and/or hexaboron nitride (hBN). An electrode formed by compression molding of the high-temperature hard material, and the high-temperature lubricating material containing at least one of Cr and hBN and having the lubricating property at the high temperature is used as the electrode for the electro-discharge surface treatment.

Method for coating sliding surface of high-temperature member, high-temperature member and electrode for electro-discharge surface treatment

The object of the present invention is to provide an Ni-based single crystal super alloy capable of improving strength by preventing precipitation of a TCP phase at high temperatures. This object is achieved by an Ni-based single crystal super alloy having a composition comprising 5.0-7.0 wt % of Al, 4.0-10.0 wt % of Ta, 1.1-4.5 wt % of Mo, 4.0-10.0 wt % of W, 3.1-8.0 wt % of Re, 0-0.50 wt % of Hf, 2.0-5.0 wt % of Cr, 0-9.9 wt % of Co and 4.1-14.0 wt % of Ru in terms of its weight ratio, with the remainder consisting of Ni and unavoidable impurities. Furthermore, in this Ni-based single crystal super alloy, when lattice constant of matrix is taken to be a1 and lattice constant of precipitation phase is taken to be a2, a2&#x2266;0.999a1.

Ni-based single crystal super alloy

A Ni-based single crystal superalloy according to the invention has, for example, a composition including: 5.0 to 7.0 wt % of Al, 4.0 to 10.0 wt % of Ta, 1.1 to 4.5 wt % of Mo, 4.0 to 10.0 wt % of W, 3.1 to 8.0 wt % of Re, 0.0 to 2.0 wt % of Hf, 2.5 to 8.5 wt % of Cr, 0.0 to 9.9 wt % of Co, 0.0 to 4.0 wt % of Nb, and 1.0 to 14.0 wt % of Ru in terms of weight ratio; and the remainder including Ni and incidental impurities. In addition, the contents of Cr, Hf and Al are preferably set so as to satisfy the equation OP&#x2267;108. According to the Ni-based single crystal superalloy of the invention, high creep strength can be maintained and the oxidation resistance can be improved.

Ni-based single crystal superalloy

A pulsed discharge is generated between tip ends of a rotating member such as a blade and a discharge electrode including a hard material such as cBN in dielectric liquid or gas by a power supply for discharge to melt the discharge electrode, and a part of the discharge electrode is attached to the tip end of the rotating member to form an abrasive coating film including the hard materials such as cBN.

Rotating member and method for coating the same

A Ni-based single crystal super alloy capable of improving strength by preventing precipitation of a TCP phase at high temperatures may be obtained by a Ni-based single crystal super alloy having a composition consisting of 5.0-7.0 wt % Al, 4.0-8.0 wt % Ta, 2.9-4.5 wt % Mo, 4.0-8.0 wt % W, 3.0-6.0 wt % Re, 0.01-0.50 wt % Hf, 2.0-5.0 wt % Cr, 0.1-15.0 wt % Co and 1.0-4.0 wt % Ru in terms of its weight ratio, with the remainder consisting of Ni and unavoidable impurities. Preferably, the composition of Co in the Ni-based single crystal super alloy is limited to 0.1-9.5 wt %.

Growing community of inventors

Tokyo, Japan

Mikiya Arai