Title:
【発明の名称】合金被覆ガスタービン翼及びその製造方法
Document Type and Number:
Japanese Patent JP2949605
Kind Code:
B2
Abstract:
A coated layer of this invention is composed of a lower alloy-coated layer 2 formed of an MCrAlY alloy whose principal element is Co or Co and Ni, an upper alloy-coated layer 1 formed of an MCrAlY alloy whose principal element is Ni and a portion 4 in which an Al content of the surface portion of the upper coated layer 1 is largest and is reduced gradually towards a more internal part. Manufacturing thereof involves the steps of forming the lower and upper coated layers and effecting an Al diffusion treatment into the upper coated layer. The upper coated layer having the portion which exhibits the large Al content contributes to a high-temperature anticorrosive property. A gas turbine blade is provided with the alloy-coated layer, wherein the lower coated layer incorporates a composite function to prevent a high-temperature corrosion of a base material when cracks are caused in the upper coated layer due to thermal stress. The gas turbine blade exhibits effects of improving the reliability and increasing a life-time.
Inventors:
KOJIMA YOSHUKI
OOTAKA KYOSHI
MEHATA TERU
ARIKAWA HIDEYUKI
SASADA TETSUO
TORITANI HAJIME
OOTAKA KYOSHI
MEHATA TERU
ARIKAWA HIDEYUKI
SASADA TETSUO
TORITANI HAJIME
Application Number:
JP24184391A
Publication Date:
September 20, 1999
Filing Date:
September 20, 1991
Export Citation:
Assignee:
HITACHI SEISAKUSHO KK
International Classes:
C22C19/05; C22C19/07; C23C4/02; C23C4/18; C23C10/02; C23C10/48; C23C28/02; F01D5/28; F01D9/02; (IPC1-7): C23C28/02; C22C19/05; C22C19/07; C23C10/48; F01D5/28; F01D9/02
Attorney, Agent or Firm:
Unuma Tatsuyuki