JP2003034887A - Method for removing oxidation resistant film on hot member surface - Google Patents
Method for removing oxidation resistant film on hot member surfaceInfo
- Publication number
- JP2003034887A JP2003034887A JP2001221992A JP2001221992A JP2003034887A JP 2003034887 A JP2003034887 A JP 2003034887A JP 2001221992 A JP2001221992 A JP 2001221992A JP 2001221992 A JP2001221992 A JP 2001221992A JP 2003034887 A JP2003034887 A JP 2003034887A
- Authority
- JP
- Japan
- Prior art keywords
- resistant film
- oxidation resistant
- heat treatment
- high temperature
- hours
- 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.)
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Links
Landscapes
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【０００１】[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
に使用される高温部材表面の耐酸化性膜を除去する方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an oxidation resistant film on a surface of a high temperature member such as a gas turbine or a jet engine, particularly a high temperature member used for a moving blade or a stationary blade.
【０００２】[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。2. Description of the Related Art As is well known, in a high temperature member such as a blade of a gas turbine, as shown in FIG. 2, a base material 1 made of a Ni-based alloy generally has MCrAlY (M
= Ni, Co) is applied.
【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
除去した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塩酸系水溶液
による酸洗が行われている。By the way, when the oxidation resistant film 2 is damaged by peeling or the like and the high temperature member is repaired, it is necessary to form a new oxidation resistant film from which the oxidation resistant film 2 is removed. Conventionally, as a method of removing the oxidation resistant film 2, pickling with a hydrochloric acid-based aqueous solution is performed.
【０００４】しかし、実機使用中に耐酸化性膜２の成
分、特にＡｌが酸化したＡｌ２Ｏ３になったり母材１側
に拡散すると、耐酸化性膜２が塩酸系水溶液に十分溶出
せず、耐酸化性膜２が残留するという問題があった。ま
た、実施使用中に熱歪を生じて過大な残留応力が発生す
ると、酸洗中に母材１の粒界腐食、あるいは応力腐食割
れを助長する問題があった。However, when components of the oxidation resistant film 2, especially Al become oxidized Al 2 O 3 or diffuse to the base material 1 side during actual use, the oxidation resistant film 2 is sufficiently eluted in the hydrochloric acid-based aqueous solution. However, there is a problem that the oxidation resistant film 2 remains. Further, if thermal strain occurs during practical use and excessive residual stress occurs, there is a problem that intergranular corrosion or stress corrosion cracking of the base material 1 is promoted during pickling.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこうした事情
を考慮してなされたので、母材表面の耐酸化性膜を１０
００℃〜１２５０℃、２時間以上の条件下で熱処理を行
い、更に前記耐酸化性膜にＡｌを補強するための熱処理
を行った後、酸洗処理により前記耐酸化性膜を除去する
ことにより、母材にダメージを与えることなく耐酸化性
膜を除去し得る高温部材表面の耐酸化性膜の除去方法を
提供することを目的とする。Since the present invention has been made in consideration of such circumstances, the oxidation resistant film formed on the surface of the base material should be 10%.
By performing a heat treatment under conditions of 00 ° C. to 1250 ° C. for 2 hours or more, and further performing a heat treatment for reinforcing Al to the oxidation resistant film, and then removing the oxidation resistant film by a pickling treatment. An object of the present invention is to provide a method for removing an oxidation resistant film on the surface of a high temperature member, which can remove the oxidation resistant film without damaging the base material.
【０００６】[0006]
【課題を解決するための手段】本発明は、動翼又は静翼
に使用される高温部材表面の耐酸化性膜を除去する方法
において、前記耐酸化性膜を１０００℃〜１２５０℃、
２時間以上の条件下で熱処理を行う工程と、前記耐酸化
性膜にＡｌを補強するための熱処理を行う工程と、酸洗
処理により前記耐酸化性膜を除去する工程とを具備する
ことを特徴とする高温部材表面の耐酸化性膜の除去方法
である。The present invention relates to a method for removing an oxidation resistant film on a surface of a high temperature member used for a moving blade or a stationary blade, wherein the oxidation resistant film is 1000 ° C to 1250 ° C.
A heat treatment for 2 hours or more; a heat treatment for reinforcing Al to the oxidation resistant film; and a step of removing the oxidation resistant film by pickling treatment. It is a characteristic method for removing an oxidation resistant film on the surface of a high temperature member.
【０００７】[0007]
【発明の実施の形態】以下、本発明について更に詳細に
説明する。本発明において、耐酸化性膜を１０００℃〜
１２５０℃、２時間以上の条件下で熱処理を行うのは、
温度が１０００℃未満では原子の拡散が進みにくいから
であり、温度が１２５０℃を越えると初期融解が生じる
からである。また、時間が２時間未満では熱処理時間が
不十分であるためであり、時間は長くてもよいが作業効
率の点も考慮すると２〜１２時間程度が好ましい。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. In the present invention, the oxidation resistant film is formed at 1000 ° C.
The heat treatment is performed at 1250 ° C. for 2 hours or more.
This is because if the temperature is lower than 1000 ° C., diffusion of atoms is difficult to proceed, and if the temperature exceeds 1250 ° C., initial melting occurs. This is because if the time is less than 2 hours, the heat treatment time is insufficient, and the time may be long, but considering the work efficiency, it is preferably about 2 to 12 hours.
【０００８】本発明において、耐酸化性膜にＡｌを補強
するための熱処理は、８００℃〜１０００℃、２〜２４
時間の条件下で行うことが好ましい。ここで、熱処理温
度が８００℃未満ではＡｌが耐酸化性膜に十分に入ら
ず、１０００℃を越えるとＡｌが入りすぎて母材にまで
達する恐れがある。また、時間が２時間未満では熱処理
時間が不十分であるためであり、上限は特に設定されな
いが作業効率の点から上限を２４時間とした。In the present invention, the heat treatment for reinforcing Al in the oxidation resistant film is performed at 800 ° C. to 1000 ° C., 2 to 24 ° C.
Preference is given to working under conditions of time. Here, when the heat treatment temperature is lower than 800 ° C., Al does not sufficiently enter the oxidation resistant film, and when it exceeds 1000 ° C., Al may enter too much and reach the base material. This is because if the time is less than 2 hours, the heat treatment time is insufficient, and the upper limit is not particularly set, but the upper limit was set to 24 hours from the viewpoint of work efficiency.
【０００９】本発明において、耐酸化性膜にＡｌを補強
するための熱処理は、Ａｌ系＋ＮＨ ４Ｃｌ＋Ｈ２雰囲気
で行うことが好ましい。この理由は、ＡｌはＮＨ４Ｃｌ
と反応してＡｌＣｌ２となって反応性を増し、塩化物は
水素と反応してＨＣｌとなって外に逃げ、Ａｌは耐酸化
性膜側に拡散するからである。In the present invention, the oxidation resistant film is reinforced with Al.
The heat treatment for heat treatment is Al-based + NH FourCl + HTwoatmosphere
It is preferable to carry out. The reason is that Al is NHFourCl
Reacts with AlClTwoBecomes more reactive and chloride is
Reacts with hydrogen to become HCl and escapes to the outside, Al is resistant to oxidation
This is because it diffuses to the side of the elastic film.
【００１０】本発明において、熱処理後、５０〜６００
℃／ｈ程度のゆっくりした速度で徐冷することが好まし
い。この理由は、速度が５０℃／ｈ未満では時間がかか
り過ぎ、速度が６００℃／ｈを越えると合金の延性が低
下するためである。In the present invention, 50 to 600 after heat treatment
It is preferable to slowly cool at a slow rate of about ° C / h. The reason is that if the speed is less than 50 ° C./h, it takes too much time, and if the speed exceeds 600 ° C./h, the ductility of the alloy decreases.
【００１１】[0011]
【実施例】以下、本発明の一実施例に係る高温部材表面
の耐酸化性膜の除去方法について図１を参照して説明す
る。但し、図２と同部材は同付番を付して説明する。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。EXAMPLE A method for removing an oxidation resistant film on the surface of a high temperature member according to an example of the present invention will be described below with reference to FIG. However, the same members as in FIG. 2 will be described with the same numbering. Further, the materials, numerical values, etc. of the respective members described in the following examples are merely examples, and do not specify the scope of rights of the present invention.
【００１２】本実施例では、母材１がＩＮ７３８ＬＣ
（ＩＮＣＯ社（現Ｓｐｅｃｉａｌ Ｍｅｔａｌｓ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
合について試験した。In this embodiment, the base material 1 is IN738LC.
(Trade name, Ni-16Cr-8.5Co-1.7Mo-, manufactured by INCO (currently, Special Metals))
2.7W-1.8Ta-3.4Ti-3.4Al-0.
12C-0.1Zr-0.01B) and the oxidation resistant film 2 was MCrAlY, specifically CoNiCrAlY.
【００１３】まず、応力除去のための熱処理工程Ａを行
った。具体的には、例えば１２００℃で２時間熱処理を
行った。この熱処理は、母材１へのダメージを防止する
ためである。但し、上記熱処理は、上記条件に限らず、
１０００℃〜１２５０℃でかつ２時間以上であればよ
い。つづいて、例えば６００℃／ｈで１０００℃まで炉
例（徐冷）した。First, a heat treatment step A for removing stress was performed. Specifically, the heat treatment was performed at 1200 ° C. for 2 hours, for example. This heat treatment is to prevent damage to the base material 1. However, the heat treatment is not limited to the above conditions,
It may be 1000 ° C to 1250 ° C for 2 hours or more. Subsequently, for example, a furnace example (slow cooling) was performed at 600 ° C./h to 1000 ° C.
【００１４】次に、Ａｌを耐酸化性膜２に補強するため
の熱処理工程Ｂを行った。具体的には、例えば（Ａｌ系
＋ＮＨ４Ｃｌ＋Ｈ２）雰囲気中、１０００℃で６時間熱
処理を行った。この熱処理は、実機使用及び応力除去熱
処理中に母材に拡散して消失したＡｌを補強するためで
ある。但し、上記熱処理は、上記条件に限らず、８００
℃〜１０００℃でかつ２〜２４時間であればよい。つづ
いて、例えば６００℃／ｈで２００℃まで炉例（徐冷）
した。Next, a heat treatment step B for reinforcing Al to the oxidation resistant film 2 was performed. Specifically, for example, heat treatment was performed at 1000 ° C. for 6 hours in an (Al system + NH 4 Cl + H 2 ) atmosphere. This heat treatment is to reinforce the Al that has diffused and disappeared in the base material during actual use and stress relief heat treatment. However, the heat treatment is not limited to the above conditions,
It suffices if the temperature is from 1000C to 1000C for 2 to 24 hours. Next, for example, furnace at 600 ℃ / h up to 200 ℃ (slow cooling)
did.
【００１５】次に、酸洗処理を行った。具体的には、次
のような手順で行った。まず、耐酸化性膜の表面をブラ
スト（Ａｌの粉）処理により付着物、汚れを除去した。
次に、非処理部（耐酸化性膜のない部分）をテープ等で
マスキングした。つづいて、例えば温度６０℃〜７０
℃、酸洗液：（２０〜３０％ＨＣｌ水溶液＋反応調整
剤）、処理時間２〜１０時間で酸洗した。この後、水
洗、中和処理、水洗・湯洗、及び乾燥を行って、耐酸化
性膜を除去した。Next, a pickling treatment was performed. Specifically, the procedure was as follows. First, the surface of the oxidation resistant film was blasted (Al powder) to remove deposits and dirt.
Next, the non-treated portion (the portion without the oxidation resistant film) was masked with a tape or the like. Then, for example, a temperature of 60 ° C to 70 ° C
C., pickling solution: (20-30% HCl aqueous solution + reaction modifier), pickling was carried out for a treatment time of 2-10 hours. Thereafter, washing with water, neutralization treatment, washing with water / hot water, and drying were performed to remove the oxidation resistant film.
【００１６】このように、上記実施例では、酸洗処理の
前に、応力除去のための熱処理工程Ａを１２００℃で２
時間熱処理を行うとともに、徐冷後、Ａｌを耐酸化性膜
に補強するための熱処理工程Ｂを、（Ａｌ系＋ＮＨ４Ｃ
ｌ＋Ｈ２）雰囲気中、１０００℃で６時間熱処理を行
う。従って、酸洗処理工程前の熱処理工程Ａにより、母
材１へのダメージを軽減して酸洗中に母材１の粒界腐食
あるいは応力腐食割れを防止できる。また、酸洗処理工
程前の熱処理工程Ｂにより、耐酸化性膜２から母材１へ
拡散した耐酸化性膜２中のＡｌを補給することができ
る。As described above, in the above embodiment, the heat treatment step A for removing stress is performed at 1200 ° C. for 2 hours before the pickling treatment.
After performing the heat treatment for a long time and gradually cooling, the heat treatment step B for reinforcing Al to the oxidation resistant film is performed by (Al system + NH 4 C
Heat treatment is performed at 1000 ° C. for 6 hours in an (1 + H 2 ) atmosphere. Therefore, the heat treatment step A before the pickling step can reduce damage to the base material 1 and prevent intergranular corrosion or stress corrosion cracking of the base material 1 during pickling. Further, in the heat treatment step B before the pickling treatment step, Al in the oxidation resistant film 2 diffused from the oxidation resistant film 2 to the base material 1 can be replenished.
【００１７】なお、上記実施例において、熱処理工程Ａ
では１２００℃で熱処理を行い、熱処理工程Ｂでは１０
００℃で熱処理を行ったが、夫々温度範囲１０００℃〜
１２５０℃、８００℃〜１０００℃であればよい。この
理由は上述した通りである。In the above embodiment, the heat treatment step A
In the heat treatment step B, the heat treatment is performed at 1200 ° C.
Heat treatment was performed at 00 ° C, but the temperature range was 1000 ° C-
It may be 1250 ° C, 800 ° C to 1000 ° C. The reason for this is as described above.
【００１８】また、上記実施例では、熱処理工程Ａを２
時間加熱した後、徐冷した場合について述べたが、これ
に限らず、徐冷の前に熱処理温度を下げて（熱処理工程
Ｂより若干高い温度で）加熱を行う段階的な熱処理工程
でもよい。In the above embodiment, the heat treatment step A is
Although the case where the material is heated for a period of time and then gradually cooled has been described, the invention is not limited to this, and a stepwise heat treatment step in which the heat treatment temperature is lowered (at a slightly higher temperature than the heat treatment step B) before the slow cooling may be used.
【００１９】更に、上記実施例では、徐冷を６００℃で
行なった場合について述べたが、これに限らず、５０〜
６００℃／ｈの範囲であればよい。Further, in the above embodiment, the case where the slow cooling is carried out at 600 ° C. is described, but the present invention is not limited to this, and it is not limited to this.
It may be in the range of 600 ° C / h.
【００２０】[0020]
【発明の効果】以上詳述したように本発明によれば、母
材表面の耐酸化性膜を１０００℃〜１２５０℃、２時間
以上の条件下で熱処理を行い、更に前記耐酸化性膜にＡ
ｌを補強するための熱処理を行った後、酸洗処理により
前記耐酸化性膜を除去することにより、母材にダメージ
を与えることなく耐酸化性膜を除去し得る高温部材表面
の耐酸化性膜の除去方法を提供できる。As described above in detail, according to the present invention, the oxidation resistant film on the surface of the base material is heat-treated under the condition of 1000 ° C. to 1250 ° C. for 2 hours or more, and the oxidation resistant film is further formed. A
After the heat treatment to reinforce 1, the oxidation resistant film is removed by pickling to remove the oxidation resistant film without damaging the base material. A method of removing a film can be provided.
【図１】本発明の一実施例に係る高温部材表面の耐酸化
性膜の除去方法における、温度と時間との関係を示す特
性図。FIG. 1 is a characteristic diagram showing a relationship between temperature and time in a method of removing an oxidation resistant film on a surface of a high temperature member according to an embodiment of the present invention.
【図２】高温部材の断面図。FIG. 2 is a cross-sectional view of a high temperature member.
１…母材、 ２…耐酸化性膜。 1 ... Base material, 2 ... Oxidation resistant film.
フロントページの続き (72)発明者 高橋 孝二 兵庫県高砂市荒井町新浜２丁目１番１号 三菱重工業株式会社高砂製作所内 (72)発明者 上村 好古 兵庫県高砂市荒井町新浜２丁目１番１号 三菱重工業株式会社高砂製作所内 (72)発明者 河合 久孝 兵庫県高砂市荒井町新浜２丁目８番19号 高菱エンジニアリング株式会社内 Ｆターム(参考） 3G002 EA05 EA06 4K053 QA07 RA19 TA04 YA02 YA03Continued front page (72) Inventor Koji Takahashi 2-1-1 Niihama, Arai-cho, Takasago, Hyogo Prefecture Takasago Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Yoshiko Uemura 2-1-1 Niihama, Arai-cho, Takasago, Hyogo Prefecture Takasago Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Hisataka Kawai 2-8-19 Niihama, Arai-cho, Takasago-shi, Hyogo Takaryo Engineering Co., Ltd. F term (reference) 3G002 EA05 EA06 4K053 QA07 RA19 TA04 YA02 YA03
Claims (4)
の耐酸化性膜を除去する方法において、 前記耐酸化性膜を１０００℃〜１２５０℃、２時間以上
の条件下で熱処理を行う工程と、前記耐酸化性膜にＡｌ
を補強するための熱処理を行う工程と、酸洗処理により
前記耐酸化性膜を除去する工程とを具備することを特徴
とする高温部材表面の耐酸化性膜の除去方法。1. A method for removing an oxidation resistant film on a surface of a high temperature member used for a moving blade or a stationary blade, wherein the oxidation resistant film is heat treated under conditions of 1000 ° C. to 1250 ° C. for 2 hours or more. Process and Al for the oxidation resistant film
A method of removing an oxidation resistant film on a surface of a high temperature member, comprising: a step of performing a heat treatment for reinforcing the above; and a step of removing the oxidation resistant film by a pickling treatment.
理は、８００℃〜１０００℃、２〜２４時間の条件下で
行うことを特徴とする請求項１記載の高温部材表面の耐
酸化性膜の除去方法。2. The oxidation resistance of the surface of the high temperature member according to claim 1, wherein the heat treatment for reinforcing Al to the oxidation resistant film is performed under the conditions of 800 ° C. to 1000 ° C. for 2 to 24 hours. Method for removing permeable film.
理は、Ａｌ系＋ＮＨ ４Ｃｌ＋Ｈ２雰囲気で行うことを特
徴とする請求項１若しくは請求項２いずれか記載の高温
部材表面の耐酸化性膜の除去方法。3. A heat treatment for reinforcing Al to the oxidation resistant film.
The reason is Al system + NH FourCl + HTwoSpecially done in an atmosphere
High temperature according to claim 1 or claim 2
A method for removing an oxidation resistant film on a member surface.
ることを特徴とする請求項１若しくは請求項２いずれか
記載の高温部材表面の耐酸化性膜の除去方法。4. The method for removing an oxidation resistant film on the surface of a high temperature member according to claim 1, wherein the heat treatment is followed by slow cooling at 50 to 600 ° C./h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001221992A JP3706554B2 (en) | 2001-07-23 | 2001-07-23 | Removal method of oxidation-resistant film on the surface of high temperature member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001221992A JP3706554B2 (en) | 2001-07-23 | 2001-07-23 | Removal method of oxidation-resistant film on the surface of high temperature member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003034887A true JP2003034887A (en) | 2003-02-07 |
| JP3706554B2 JP3706554B2 (en) | 2005-10-12 |
Family
ID=19055558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| JP2001221992A Expired - Lifetime JP3706554B2 (en) | 2001-07-23 | 2001-07-23 | Removal method of oxidation-resistant film on the surface of high temperature member |
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| JP2009509082A (en) * | 2005-09-24 | 2009-03-05 | エムティーユー エアロ エンジンズ ゲーエムベーハー | Method for cleaning gas turbine component cavities |
| WO2009101690A1 (en) * | 2008-02-14 | 2009-08-20 | Mitsubishi Heavy Industries, Ltd. | Method of regenerating gas turbine blade and gas turbine blade regenerating apparatus |
| JP2014163261A (en) * | 2013-02-22 | 2014-09-08 | Mitsubishi Heavy Ind Ltd | Use propriety determination method of acidic aqueous solution |
| JP2016145577A (en) * | 2016-02-16 | 2016-08-12 | 三菱重工業株式会社 | Acidic aqueous solution usability determination method |
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2001
- 2001-07-23 JP JP2001221992A patent/JP3706554B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009509082A (en) * | 2005-09-24 | 2009-03-05 | エムティーユー エアロ エンジンズ ゲーエムベーハー | Method for cleaning gas turbine component cavities |
| WO2009101690A1 (en) * | 2008-02-14 | 2009-08-20 | Mitsubishi Heavy Industries, Ltd. | Method of regenerating gas turbine blade and gas turbine blade regenerating apparatus |
| CN101932794A (en) * | 2008-02-14 | 2010-12-29 | 三菱重工业株式会社 | Method of regenerating gas turbine blade and gas turbine blade regenerating apparatus |
| JP4848460B2 (en) * | 2008-02-14 | 2011-12-28 | 三菱重工業株式会社 | Gas turbine blade regeneration method and gas turbine blade regeneration device |
| US8876978B2 (en) | 2008-02-14 | 2014-11-04 | Mitsubishi Heavy Industries, Ltd. | Method for regenerating gas turbine blade and gas turbine blade regenerating apparatus |
| JP2014163261A (en) * | 2013-02-22 | 2014-09-08 | Mitsubishi Heavy Ind Ltd | Use propriety determination method of acidic aqueous solution |
| CN105121813A (en) * | 2013-02-22 | 2015-12-02 | 三菱重工业株式会社 | Method for determining whether acidic aqueous solution is usable |
| US9612218B2 (en) | 2013-02-22 | 2017-04-04 | Mitsubishi Heavy Industries, Ltd. | Method for determining whether acidic aqueous solution is usable |
| JP2016145577A (en) * | 2016-02-16 | 2016-08-12 | 三菱重工業株式会社 | Acidic aqueous solution usability determination method |
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