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JP3999482B2 - Protection method for brazed parts on moving and stationary blades - Google Patents

Protection method for brazed parts on moving and stationary blades Download PDF

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Publication number
JP3999482B2
JP3999482B2 JP2001224927A JP2001224927A JP3999482B2 JP 3999482 B2 JP3999482 B2 JP 3999482B2 JP 2001224927 A JP2001224927 A JP 2001224927A JP 2001224927 A JP2001224927 A JP 2001224927A JP 3999482 B2 JP3999482 B2 JP 3999482B2
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JP
Japan
Prior art keywords
brazed
blade
moving
protecting
brazed portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2001224927A
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Japanese (ja)
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JP2003035103A (en
Inventor
郁生 岡田
秀明 金子
孝二 高橋
好古 上村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to JP2001224927A priority Critical patent/JP3999482B2/en
Publication of JP2003035103A publication Critical patent/JP2003035103A/en
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Publication of JP3999482B2 publication Critical patent/JP3999482B2/en
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  • Chemically Coating (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、ガスタービン、ジェットエンジンなどの高温部材、特に動翼あるいは静翼の先端にロー付けされたロー付け部を保護する動・静翼におけるロー付け部の保護方法に関する。
【0002】
【従来の技術】
周知の如く、例えばガスタービンの動翼等の高温部材においては、図2に示すように、Ni基耐熱合金からなる母材1の表面には、一般にMCrAlY(M=Ni,Co)からなる耐酸化性膜2が施工されている。
【0003】
ところで、前記耐酸化性膜2が剥離等により損傷して高温部材を補修する時には、耐酸化性膜2を除去して新たな耐酸化性膜を形成する必要がある。従来、耐酸化性膜2を除去する方法としては、機械研磨及び塩酸系水溶液による酸洗が行われている。
【0004】
一方、例えば動翼では、翼先端の開口部に鋳造時の中子を支持する目的でプラグをNiロー付けにより接合している。しかし、耐酸化性膜2を除去するための酸洗により、本来ダメージを入れてはならないロー付け部が酸により溶出し、欠陥が発生するという問題があった。これは、ロー付け時に母材の成分、例えばAlがロー材中に拡散するため、酸に対し溶けやすくなっためで、実作業上避けることができない。
【0005】
【発明が解決しようとする課題】
本発明の目的は、ロー付け部に有機系樹脂を塗布することによりロー付け部を保護することにより、酸洗中にロー付け部が酸洗時の酸により溶出して欠陥が発生するのを防止しえる動・静翼におけるロー付け部の保護方法を提供することにある。
【0006】
また、本発明の目的は、ロー付け部にNi系又はCo系の少なくともいずれか一方による金属を低圧あるいは大気で溶射することによりロー付け部を保護することにより、酸洗中にロー付け部が酸洗時の酸により溶出して欠陥が発生するのを防止しえる動・静翼におけるロー付け部の保護方法を提供することにある。
【0007】
更に、本発明の目的は、動翼又は静翼の先端にロー付けされたロー付け部を保護する方法であり、ロー付け部にNi−Pの無電解メッキ、あるいはNi−Cr又はCrの電気メッキを行うことによりロー付け部を保護することにより、酸洗中にロー付け部が酸洗時の酸により溶出して欠陥が発生するのを防止しえる動・静翼におけるロー付け部の保護方法を提供することにある。
【0008】
【課題を解決するための手段】
本願第1の発明は、ガスタービンやジェットエンジンなどの高温部材の動翼又は静翼の表面に施工されている耐酸化性膜を酸洗除去し、新たな耐酸化性膜を形成する際に、動翼又は静翼の先端にロー付けされたロー付け部を保護する方法であり、ロー付け部に有機系樹脂を塗布乾燥することによりロー付け部を保護した状態で酸洗を行うことを特徴とする動・静翼におけるロー付け部の保護方法である。
本願第2の発明は、有機系樹脂はアクリル系樹脂であることを特徴とする上記記載の動・静翼におけるロー付け部の保護方法である。
【0009】
本願第の発明は、ガスタービンやジェットエンジンなどの高温部材の動翼又は静翼の表面に施工されている耐酸化性膜を酸洗除去し、新たな耐酸化性膜を形成する際に、動翼又は静翼の先端にロー付けされたロー付け部を保護する方法であり、ロー付け部にNi系又はCo系の少なくともいずれか一方による金属を低圧あるいは大気で溶射することによりロー付け部を保護した状態で酸洗を行うことを特徴とする動・静翼におけるロー付け部の保護方法である。
【0010】
本願第の発明は、ガスタービンやジェットエンジンなどの高温部材の動翼又は静翼の表面に施工されている耐酸化性膜を酸洗除去し、新たな耐酸化性膜を形成する際に、動翼又は静翼の先端にロー付けされたロー付け部を保護する方法であり、ロー付け部にNi−Pの無電解メッキ、あるいはNi−Cr又はCrの電気メッキを行うことによりロー付け部を保護した状態で酸洗を行うことを特徴とする動・静翼におけるロー付け部の保護方法である。
【0011】
【発明の実施の形態】
以下、本発明の各実施例に係るに動・静翼におけるロー付け部の保護方法について図1を参照して説明する。なお、図2と同部材は同付番を付して説明を省略する。また、下記実施例で述べる各部材の材質、数値等は一例を示すもので、本発明の権利範囲を特定するものではない。
【0012】
各実施例の動翼は、母材1がIN738LC(INCO社(現SpecialMetals社)製の商品名、Ni−16Cr−8.5Co−1.7Mo− 2.7W−1.8Ta−3.4Ti−3.4Al−0.12C−0.1Zr− 0.01B)で、耐酸化性膜2がMCrAlY,具体的にはCoNiCrAlYである場合を示す。
【0013】
(実施例1)
本実施例1は、ロー付け部に有機系樹脂を塗装する場合の例を示す。
図1において、付番11は動翼を示し、その先端開口部11aには板状のプラグ12が配置されている。このプラグ12のロー付け部13には、有機系樹脂としてのアクリル系樹脂(商品名:フロンマスク、古藤産業社製)が塗装されている。有機系樹脂はロー付け部にスラリー状に刷毛を用いて塗布した後、乾燥することにより形成される。
【0014】
このように、実施例1では、プラグ12のロー付け部13には、有機系樹脂としてのフロンマスクが塗装されているので、母材1上の耐酸化性膜2を酸洗により除去する際、ロー付け部13が有機系樹脂で保護されるので、ロー付け時に母材1の成分のAl等がロー材に拡散するのを防止し、ロー付け部13が酸により溶出して欠陥が発生するのを防止できる。
【0015】
(実施例2)
本実施例2は、ロー付け部12にNi系の金属を低圧で溶射する場合の例を示す。ここで、低圧とは、例えば100torrである。また、溶射はプラズマ溶射を意味する。
【0016】
実施例2によれば、実施例1と同様な効果を有する。なお、Ni系の金属の代わりにNi−Cr系の金属、あるいは両者を用いてもよい。Ni−Cr系金属を用いる場合、Crが耐酸化性を有するので、ロー付け部の保護効果を高める意味で望ましい。また、低圧で溶射する代わりに大気圧で溶射してもよい。
【0017】
(実施例3)
本実施例3は、ロー付け部12をNi−P系の無電解メッキにより保護する例を示す。ここで、無電解メッキは、硫酸Ni,次亜リン酸ナトリウム及び酢酸ナトリウムを含む溶液中にロー付け部及びその近傍を5時間浸すことで、Niのメッキ層を当該部に形成させて行った。
【0018】
なお、実施例では、無電解メッキを行った場合について述べたが、これに限らず、Ni−CrあるいはCrによる電気めっきを行ってもよい。
【0019】
【発明の効果】
以上詳述したように本発明によれば、ロー付け部に有機系樹脂を塗布することによりロー付け部を保護することにより、酸洗中にロー付け部が酸洗時の酸により溶出して欠陥が発生するのを防止しえる動・静翼におけるロー付け部の保護方法を提供できる。
【図面の簡単な説明】
【図1】本発明の実施例に係る動翼の要部の説明図。
【図2】高温部材の要部の断面図。
【符号の説明】
1…母材、
2…耐酸化性膜、
11…動翼、
12…プラグ、
13…ロー付け部。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for protecting a brazed portion in a moving / static blade that protects a brazed portion brazed to a high temperature member such as a gas turbine or a jet engine, particularly a moving blade or a tip of a stationary blade.
[0002]
[Prior art]
As is well known, in a high-temperature member such as a moving blade of a gas turbine, for example, as shown in FIG. 2, the surface of the base material 1 made of a Ni-base heat-resistant alloy is generally made of acid resistant Chemical film 2 is applied.
[0003]
By the way, when the oxidation resistant film 2 is damaged due to peeling or the like to repair a high temperature member, it is necessary to remove the oxidation resistant film 2 to form a new oxidation resistant film. Conventionally, as a method for removing the oxidation resistant film 2, mechanical polishing and pickling with a hydrochloric acid aqueous solution are performed.
[0004]
On the other hand, for example, in a moving blade, a plug is joined to the opening at the tip of the blade by Ni brazing for the purpose of supporting the core during casting. However, the pickling for removing the oxidation-resistant film 2 causes a problem that a brazed portion, which should not be damaged originally, is eluted by an acid and a defect is generated. This is because the components of the base material, for example, Al diffuses into the brazing material during brazing, so that it easily dissolves in the acid and cannot be avoided in actual work.
[0005]
[Problems to be solved by the invention]
The purpose of the present invention is to protect the brazing part by applying an organic resin to the brazing part, so that the brazing part is eluted by the acid during pickling and defects are generated during pickling. An object of the present invention is to provide a method for protecting a brazed portion in a moving / static blade that can be prevented.
[0006]
In addition, the purpose of the present invention is to protect the brazing part by spraying a metal based on at least one of Ni-based or Co-based on the brazing part at a low pressure or in the air, so that the brazing part is not pickled during pickling. An object of the present invention is to provide a method for protecting a brazed portion of a moving / static blade that can prevent the occurrence of defects due to elution with acid during pickling.
[0007]
Furthermore, an object of the present invention is a method for protecting a brazed portion brazed to the tip of a moving blade or a stationary blade, and the brazed portion is electrolessly plated with Ni-P, or electroplated with Ni-Cr or Cr. By protecting the brazed part by plating, it is possible to prevent the brazed part from eluting with the acid during pickling and generating defects during pickling. It is to provide a method.
[0008]
[Means for Solving the Problems]
In the first invention of the present application, when the oxidation-resistant film applied to the surface of a moving blade or stationary blade of a high-temperature member such as a gas turbine or a jet engine is pickled and removed, a new oxidation-resistant film is formed. This is a method for protecting a brazed part brazed to the tip of a moving blade or stationary blade, and performing pickling in a state where the brazed part is protected by applying and drying an organic resin on the brazed part. This is a method for protecting a brazed portion in a moving / stator blade.
A second invention of the present application is the method for protecting a brazed portion in a moving / static blade described above, wherein the organic resin is an acrylic resin.
[0009]
The third invention of the present application is a method for pickling and removing an oxidation-resistant film applied to the surface of a moving blade or stationary blade of a high-temperature member such as a gas turbine or a jet engine to form a new oxidation-resistant film. This is a method for protecting a brazing part brazed to the tip of a moving blade or a stationary blade, and brazing is performed by spraying a metal of at least one of Ni and Co based on the brazing part at a low pressure or in the atmosphere. It is a method for protecting a brazed portion in a moving / static blade, wherein pickling is performed with the portion protected.
[0010]
In the fourth invention of the present application, when the oxidation-resistant film applied to the surface of the moving blade or stationary blade of a high-temperature member such as a gas turbine or a jet engine is pickled and removed, a new oxidation-resistant film is formed. a method for protecting the low-ordered brazed portion on the tip of the blade or vane, brazing by performing electroplating of electroless plating or Ni-Cr or Cr, the Ni-P in the brazed portion It is a method for protecting a brazed portion in a moving / static blade, wherein pickling is performed with the portion protected.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for protecting a brazed portion in a moving / static blade according to each embodiment of the present invention will be described with reference to FIG. Note that the same members as those in FIG. Moreover, the material of each member described in the following Example, a numerical value, etc. show an example, and do not specify the right range of this invention.
[0012]
In the rotor blade of each example, the base material 1 is IN738LC (trade name, manufactured by INCO (currently Special Metals), Ni-16Cr-8.5Co-1.7Mo-2.7W-1.8Ta-3.4Ti- 3.4Al-0.12C-0.1Zr-0.01B), and the oxidation resistant film 2 is MCrAlY, specifically, CoNiCrAlY.
[0013]
Example 1
Example 1 shows an example in which an organic resin is applied to the brazed portion.
In FIG. 1, reference numeral 11 indicates a moving blade, and a plate-like plug 12 is disposed at the tip opening portion 11a. The brazing portion 13 of the plug 12 is coated with an acrylic resin (trade name: Freon mask, manufactured by Fudo Sangyo Co., Ltd.) as an organic resin. The organic resin is formed by applying a slurry to the brazed portion using a brush and then drying.
[0014]
As described above, in Example 1, the brazing portion 13 of the plug 12 is coated with the Freon mask as an organic resin, and therefore when the oxidation resistant film 2 on the base material 1 is removed by pickling. Since the brazing part 13 is protected with an organic resin, it prevents the component Al of the base material 1 from diffusing into the brazing material during brazing, and the brazing part 13 is eluted by acid to cause defects. Can be prevented.
[0015]
(Example 2)
The second embodiment shows an example in which Ni-based metal is sprayed on the brazing portion 12 at a low pressure. Here, the low pressure is, for example, 100 torr. Thermal spraying means plasma thermal spraying.
[0016]
The second embodiment has the same effect as the first embodiment. Note that a Ni-Cr metal or both may be used instead of the Ni metal. When using a Ni-Cr type metal, since Cr has oxidation resistance, it is desirable in terms of enhancing the protective effect of the brazed portion. Further, instead of spraying at low pressure, spraying may be performed at atmospheric pressure.
[0017]
(Example 3)
The third embodiment shows an example in which the brazing portion 12 is protected by Ni-P electroless plating. Here, the electroless plating was performed by immersing the brazed portion and its vicinity in a solution containing Ni sulfate, sodium hypophosphite and sodium acetate for 5 hours to form a Ni plating layer on the portion. .
[0018]
In the embodiment, the case where electroless plating is performed has been described. However, the present invention is not limited thereto, and electroplating using Ni—Cr or Cr may be performed.
[0019]
【The invention's effect】
As described above in detail, according to the present invention, by protecting the brazing portion by applying an organic resin to the brazing portion, the brazing portion is eluted by acid during pickling during pickling. It is possible to provide a method for protecting a brazed portion in a moving / static blade that can prevent the occurrence of defects.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a main part of a moving blade according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of a high temperature member.
[Explanation of symbols]
1 ... Base material,
2 ... Oxidation resistant film,
11 ... Rotor blade,
12 ... Plug,
13 ... brazing part.

Claims (4)

ガスタービンやジェットエンジンなどの高温部材の動翼又は静翼の表面に施工されている耐酸化性膜を酸洗除去し、新たな耐酸化性膜を形成する際に、動翼又は静翼の先端にロー付けされたロー付け部を保護する方法であり、ロー付け部に有機系樹脂を塗布乾燥することによりロー付け部を保護した状態で酸洗を行うことを特徴とする動・静翼におけるロー付け部の保護方法。 When the oxidation resistance film which is construction on the surface of the blade or vane of the high-temperature member such as gas turbines and jet engines pickled removed, to form a new oxidation film, the blade or vane This is a method for protecting a brazed part brazed to the tip, and is characterized by performing pickling in a state where the brazed part is protected by applying and drying an organic resin to the brazed part. Protection method of brazing part in 有機系樹脂はアクリル系樹脂であることを特徴とする請求項1記載の動・静翼におけるロー付け部の保護方法。  The method for protecting a brazed portion in a moving / static blade according to claim 1, wherein the organic resin is an acrylic resin. ガスタービンやジェットエンジンなどの高温部材の動翼又は静翼の表面に施工されている耐酸化性膜を酸洗除去し、新たな耐酸化性膜を形成する際に、動翼又は静翼の先端にロー付けされたロー付け部を保護する方法であり、ロー付け部にNi系又はCo系の少なくともいずれか一方による金属を低圧あるいは大気で溶射することによりロー付け部を保護した状態で酸洗を行うことを特徴とする動・静翼におけるロー付け部の保護方法。 When the oxidation resistant film applied to the surface of the moving blade or stationary blade of a high-temperature member such as a gas turbine or jet engine is pickled and removed to form a new oxidation resistant film, the moving blade or stationary blade a method of protecting a brazed been brazed portion on the tip, acid while protecting the brazed portion by spraying at low pressure or atmospheric metal by at least one of Ni-based or Co-based low mounting portion A method for protecting a brazed portion of a moving / static blade, characterized by performing washing . ガスタービンやジェットエンジンなどの高温部材の動翼又は静翼の表面に施工されている耐酸化性膜を酸洗除去し、新たな耐酸化性膜を形成する際に、動翼又は静翼の先端にロー付けされたロー付け部を保護する方法であり、ロー付け部にNi−Pの無電解メッキ、あるいはNi−Cr又はCrの電気メッキを行うことによりロー付け部を保護した状態で酸洗を行うことを特徴とする動・静翼におけるロー付け部の保護方法。 When the oxidation resistant film applied to the surface of the moving blade or stationary blade of a high-temperature member such as a gas turbine or jet engine is pickled and removed to form a new oxidation resistant film, the moving blade or stationary blade This is a method for protecting the brazed portion brazed to the tip, and in the state where the brazed portion is protected by performing electroless plating of Ni-P or electroplating of Ni-Cr or Cr on the brazed portion. A method for protecting a brazed portion of a moving / static blade, characterized by performing washing .
JP2001224927A 2001-07-25 2001-07-25 Protection method for brazed parts on moving and stationary blades Expired - Lifetime JP3999482B2 (en)

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US7587818B2 (en) * 2004-12-23 2009-09-15 General Electric Company Repair of gas turbine blade tip without recoating the repaired blade tip
JP2011516269A (en) * 2008-03-31 2011-05-26 アルストム テクノロジー リミテッド Blade for gas turbine

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US4411597A (en) * 1981-03-20 1983-10-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Tip cap for a rotor blade
JPH0515417Y2 (en) * 1986-07-03 1993-04-22
JPH0625713A (en) * 1992-07-13 1994-02-01 Kubota Corp Method for sintering cr-base heat-resistant alloy powder
US6117560A (en) * 1996-12-12 2000-09-12 United Technologies Corporation Thermal barrier coating systems and materials
JPH11343564A (en) * 1998-05-28 1999-12-14 Mitsubishi Heavy Ind Ltd High temperature equipment

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