JPH0751744B2 - Steam turbine blades - Google Patents
Steam turbine bladesInfo
- Publication number
- JPH0751744B2 JPH0751744B2 JP60096669A JP9666985A JPH0751744B2 JP H0751744 B2 JPH0751744 B2 JP H0751744B2 JP 60096669 A JP60096669 A JP 60096669A JP 9666985 A JP9666985 A JP 9666985A JP H0751744 B2 JPH0751744 B2 JP H0751744B2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- coating
- erosion
- steam turbine
- tin
- 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
Links
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は、耐エロージョン性被膜を備えた蒸気タービン
ブレードに関する。Description: FIELD OF THE INVENTION The present invention relates to steam turbine blades with an erosion resistant coating.
(従来の技術) 第6図は、従来の低圧側タービンブレードの平面図、第
7図はその正面図を示す。(Prior Art) FIG. 6 is a plan view of a conventional low-pressure side turbine blade, and FIG. 7 is a front view thereof.
蒸気タービンでは、高圧側入口より送入された蒸気は圧
力・温度エネルギーが速度エネルギーに変換し、その後
各段のブレード1に作用する。そして速度エネルギーを
回転エネルギーに変換した後、低圧側の排出口から排出
される。In the steam turbine, pressure / temperature energy of the steam sent from the high-pressure side inlet is converted into velocity energy, and thereafter acts on the blade 1 of each stage. Then, after the velocity energy is converted to rotational energy, it is discharged from the low pressure side discharge port.
その際、蒸気の圧力、温度の低下に伴い復水タービンで
は低圧側の最終段近傍になると、湿り蒸気となるため蒸
気中の水滴が第6図に示すように矢印6の方向からブレ
ード1に衝突し、表面にエロージヨンが発生する。At that time, when the pressure and temperature of the steam decrease, and near the final stage of the low pressure side in the condensing turbine, it becomes wet steam, so that the water droplets in the steam from the direction of arrow 6 to the blade 1 as shown in FIG. Collision causes erosion on the surface.
これを防止するため、従来は第6図及び第7図に示す如
く、ブレード1の、蒸気中の水滴衝突部にステライト
(Co−Cr−W合金)薄板4を銀ロウ5にて取り付け、エ
ロージヨンの発生を防止していたが、これには次のよう
な欠点があつた。In order to prevent this, conventionally, as shown in FIG. 6 and FIG. 7, a stellite (Co-Cr-W alloy) thin plate 4 is attached to a portion of the blade 1 where water droplets collide in steam with silver braze 5, and then erosion is performed. However, this has the following drawbacks.
(1) ロウ付によりブレード1の母材(SUS410J1)の
疲労限が低下し、ブレード1の強度設計上の制約が厳し
くなる。(1) The brazing reduces the fatigue limit of the base material (SUS410J1) of the blade 1 and makes the strength design of the blade 1 tighter.
(2) ステライト薄板4は硬度(Hv)が400〜450と高
いので、ブレード1の曲面どおりに曲げ加工し、密着さ
せることが困難である。(2) Since the stellite thin plate 4 has a high hardness (Hv) of 400 to 450, it is difficult to bend the stellite thin plate 4 according to the curved surface of the blade 1 and bring it into close contact.
(3) ロウ付作業は手作業なので、多大な労力が必要
であり品質がばらつく。(3) Since the brazing work is a manual work, a lot of labor is required and the quality varies.
また、エロージヨンを防止するために、イオンプレーテ
イング等の真空蒸着法によりセラミツク被膜(例、TiN,
CrN,TiO2等)を形成する技術もある。このセラミツク被
膜は、耐摩耗性、耐エロージヨン性が優れている。そし
て、同じ厚さの被膜でも、多層コーティングしたものの
方が、単層コーティングの物よりも耐エロージヨン性が
良いことも確認されている(第8図参照)。In order to prevent erosion, a ceramic coating (eg TiN,
There is also a technique for forming CrN, TiO 2, etc.). This ceramic coating has excellent wear resistance and erosion resistance. It has also been confirmed that even coatings having the same thickness have a multi-layer coating and have better erosion resistance than a single-layer coating (see FIG. 8).
しかし、上記のタービンブレードにステライトを銀ロウ
付したものと比較すると、第8図のようにまだキヤビテ
ーシヨンエロージヨン試験での重量減少量が多く、ステ
ライトによるものより耐エロージヨン性に劣る。However, when compared with the turbine blade with silver brazing of stellite, the weight loss in the cavitation erosion test is still large as shown in FIG. 8 and the erosion resistance is inferior to that of stellite.
(発明が解決しようとする問題点) 本発明は、安価で、長時間の運転に耐える低圧側タービ
ンブレードの開発を目的としてもので、耐剥離性(密着
性)の優れた耐エロージヨン被膜を提案するものであ
る。(Problems to be Solved by the Invention) The present invention is intended to develop a low-pressure turbine blade that is inexpensive and can withstand long-term operation, and proposes an erosion-resistant coating film having excellent peeling resistance (adhesion). To do.
(問題点を解決するための手段) 本発明は、母材表面にCr又はTiのコーティング層と、該
コーティング層表面にCrN又はTiNのコーティング層を真
空蒸着により積層複合コーティングしてなることを特徴
とする蒸気タービンブレードである。(Means for Solving Problems) The present invention is characterized in that a coating layer of Cr or Ti is formed on the surface of a base material, and a coating layer of CrN or TiN is laminated and composite-coated on the surface of the coating layer by vacuum deposition. It is a steam turbine blade.
すなわち本発明は、イオンプレーテイング等の真空蒸着
法による金属とセラミツクの複合被膜でブレード表面を
覆い、エロージヨンの発生を防止しようとするものであ
る。That is, the present invention is intended to prevent the generation of erosion by covering the blade surface with a composite coating of metal and ceramic by a vacuum deposition method such as ion plating.
第1図は本発明を蒸気タービンの低圧側タービンブレー
ドに実施した例を示す。ブレード1(SUS410J1)の、蒸
気中の水滴衝突面にイオンブレーテイング法によりCr又
はTiを蒸着し、その上にCrN又はTiN等のセラミツクを蒸
着して被膜7を形成する。この複合被膜7により、水滴
の衝突によるエロージヨンが防止される。FIG. 1 shows an example in which the present invention is applied to a low pressure side turbine blade of a steam turbine. Cr or Ti is vapor-deposited on the surface of the blade 1 (SUS410J1) that collides with water droplets in steam by the ion blasting method, and a ceramic such as CrN or TiN is vapor-deposited thereon to form the coating 7. The composite coating 7 prevents erosion due to collision of water droplets.
(実施例) 被膜形成条件の一例を表1に示す。(Example) Table 1 shows an example of film forming conditions.
表1中、Cr+CrNの連続コーティング法とは、この場合5
70℃に加熱しておいて先ずCrを蒸着させ、そのままCrN
を蒸着させたものであり、Cr+TiNとTi+TiNは、第2図
に示すように、この場合570℃でCr又はTiを蒸着させた
後、一旦室温に冷却し、次いでこの場合570℃に加熱し
てTiNを蒸着させたものである。 In Table 1, the continuous coating method of Cr + CrN is 5 in this case.
After heating to 70 ℃, Cr is vapor-deposited first, and then CrN
As shown in Fig. 2, Cr + TiN and Ti + TiN are obtained by vapor-depositing Cr or Ti at 570 ° C, then once cooling to room temperature, and then heating to 570 ° C in this case. TiN is vapor-deposited.
第3図は、SUS410J1母材表面にCrとTiNを表1のCr+TiN
の条件で被覆した場合の金属組織の断面を示す顕微鏡写
真(1000倍)である。Figure 3 shows Cr and TiN on the surface of the SUS410J1 base metal as Cr + TiN in Table 1.
2 is a photomicrograph (1000 times) showing a cross section of a metal structure when coated under the condition (1).
また、SUS410J1を母材として表1に示す3種類の複合被
膜を施した試験片の耐エロージヨン試験結果を第4図に
示す。耐エロージヨン試験は、電歪式超音波振動試験機
を用いて行なつた。振幅、周波数等試験条件はすべて同
一である。なお、電歪式超音波振動試験とは、試験片を
脱イオン水中で超音波振動させることによつて、試験片
にキヤビテーシヨン・エロージヨンを発生させる試験を
いう。Further, FIG. 4 shows the results of the erosion resistance test of the test pieces on which the three kinds of composite coatings shown in Table 1 were applied using SUS410J1 as the base material. The erosion resistance test was performed using an electrostrictive ultrasonic vibration tester. Test conditions such as amplitude and frequency are all the same. The electrostrictive ultrasonic vibration test is a test in which a test piece is subjected to ultrasonic vibration in deionized water to generate cavitation erosion.
第4図より、表1に示す複合被膜はステライトとほぼ同
様の耐エロージヨン性を示すことがわかる。It can be seen from FIG. 4 that the composite coatings shown in Table 1 exhibit almost the same erosion resistance as Stellite.
更に、第5図にSUS410J1を母材として表1のCr+TiNの
条件でCrとTiNを被覆した場合の疲労試験を母材のみの
場合と比較して示す。第5図より本発明被膜によればブ
レードの疲労限を低下させないことが判る。Further, FIG. 5 shows a fatigue test when SUS410J1 is used as a base material and Cr and TiN are coated under the condition of Cr + TiN in Table 1 in comparison with the case where only the base material is used. It can be seen from FIG. 5 that the coating of the present invention does not reduce the fatigue limit of the blade.
(発明の効果) (1) 母材とセラミツクの間に、両者の中間の線膨強
率であるCr又はTiをコーティングすることによつて、セ
ラミツクに発生する内部応力が緩和され、密着性が向上
する。(Effects of the Invention) (1) By coating the base material and the ceramic with a linear expansion coefficient of Cr or Ti intermediate between the two, the internal stress generated in the ceramic is relaxed and the adhesion is improved. improves.
(2) 第2図の加熱サイクルによる多層コーティング
によれば、すでにコーティングされているCr又はTi被膜
の残留応力が緩和され、多層コーティング被膜全体の内
部応力が、同一厚さの単層コーティング被膜より小さく
なるという利点がある。(2) According to the multi-layer coating by the heating cycle of FIG. 2, the residual stress of the Cr or Ti film already coated is relaxed, and the internal stress of the whole multi-layer coating film is less than that of the single-layer coating film of the same thickness. It has the advantage of being smaller.
(3) ブレードの疲労限を低下させないため、従来の
ステライト薄板を銀ロウ付するものに比べ、強度設計が
楽になる。これにより高速化、長翼化といつたタービン
の高性能化への対応が容易になる。(3) Since the fatigue limit of the blade is not lowered, the strength design is easier than the conventional stellite thin plate with silver brazing. This makes it easier to respond to higher speeds, longer blades, and higher turbine performance.
(4) 従来のステライト薄板銀ロウ付材とほぼ同様の
耐エロージヨン性を得ることができる。(4) It is possible to obtain the same erosion resistance as that of the conventional stellite thin plate silver brazing material.
(5) 従来の手作業によるステライト薄板の銀ロウ付
に比べて、作業能率がよく、大幅なコストダウン(約1/
2)が可能である。(5) Compared to the conventional manual brazing of stellite thin plate with silver brazing, work efficiency is good, and significant cost reduction (about 1 /
2) is possible.
第1図は本発明の一実施態様例を示す図、第2図は本発
明被膜形成の一条件を示す加熱サイクル図、第3図は本
発明の実施例で得られた金属組織の断面を示す顕微鏡写
真、第4,5図は本発明の実施例で得られた結果を示す図
表、第6図及び第7図は従来のタービンブレードを示す
図、第8図は従来技術の欠点を示す図表である。FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a heating cycle diagram showing one condition of forming a coating film of the present invention, and FIG. 3 is a cross section of a metallographic structure obtained in the embodiment of the present invention. Micrographs shown in FIGS. 4 and 5 are charts showing the results obtained in the examples of the present invention, FIGS. 6 and 7 are diagrams showing conventional turbine blades, and FIG. 8 is a drawback of the prior art. It is a chart.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中川 義清 広島県広島市西区観音新町4丁目6番22号 三菱重工業株式会社広島研究所内 (72)発明者 波多野 雅昭 広島県広島市西区観音新町4丁目6番22号 三菱重工業株式会社広島造船所内 (72)発明者 尾土平 俊彦 広島県広島市西区観音新町4丁目6番22号 三菱重工業株式会社広島研究所内 (72)発明者 板野 重夫 広島県広島市西区観音新町4丁目6番22号 三菱重工業株式会社広島研究所内 (56)参考文献 特開 昭54−139891(JP,A) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshinaka Nakagawa, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory (72) Inventor Masaaki Hatano 4-chome, Kannon Shinmachi, Nishi-ku, Hiroshima Prefecture No. 6-22 Mitsubishi Heavy Industries, Ltd. Hiroshima Shipyard (72) Inventor Toshihiko Odohira 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Hiroshima Institute (72) Inventor Shigeo Itano Nishi-ku, Hiroshima-shi, Hiroshima Prefecture 4-6-22 Kannon-Shinmachi Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory (56) Reference JP-A-54-139891 (JP, A)
Claims (1)
該コーティング層表面にCrN又はTiNのコーティング層を
真空蒸着により積層複合コーティングしてなることを特
徴とする蒸気タービンブレード。1. A Cr or Ti coating layer on the surface of a base material,
A steam turbine blade, characterized in that a CrN or TiN coating layer is laminated and composite-coated on the surface of the coating layer by vacuum deposition.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60096669A JPH0751744B2 (en) | 1985-05-09 | 1985-05-09 | Steam turbine blades |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60096669A JPH0751744B2 (en) | 1985-05-09 | 1985-05-09 | Steam turbine blades |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61257466A JPS61257466A (en) | 1986-11-14 |
JPH0751744B2 true JPH0751744B2 (en) | 1995-06-05 |
Family
ID=14171210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60096669A Expired - Lifetime JPH0751744B2 (en) | 1985-05-09 | 1985-05-09 | Steam turbine blades |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0751744B2 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63159602A (en) * | 1986-12-23 | 1988-07-02 | Mitsubishi Heavy Ind Ltd | Blade for steam turbine |
JPS63129102A (en) * | 1986-11-17 | 1988-06-01 | Mitsubishi Heavy Ind Ltd | Antierosive steam turbine blade |
US5190824A (en) | 1988-03-07 | 1993-03-02 | Semiconductor Energy Laboratory Co., Ltd. | Electrostatic-erasing abrasion-proof coating |
US6224952B1 (en) | 1988-03-07 | 2001-05-01 | Semiconductor Energy Laboratory Co., Ltd. | Electrostatic-erasing abrasion-proof coating and method for forming the same |
JP2571957B2 (en) * | 1988-09-19 | 1997-01-16 | 株式会社半導体エネルギー研究所 | Carbon-based or carbon-based coating via buffer layer and method of making same |
JPH02298256A (en) * | 1989-05-11 | 1990-12-10 | Sekiyu Kodan | Corrosion resisting double layer film |
JPH05209261A (en) * | 1991-12-03 | 1993-08-20 | Sumitomo Metal Mining Co Ltd | Article with corrosion and wear resistance coating film |
JP2608234B2 (en) * | 1992-02-26 | 1997-05-07 | 東洋エンジニアリング株式会社 | Pressure reducing valve for urea synthesis plant |
JP3291552B2 (en) * | 1994-05-30 | 2002-06-10 | 独立行政法人産業技術総合研究所 | Seal or bearing |
EP1712745A1 (en) | 2005-04-14 | 2006-10-18 | Siemens Aktiengesellschaft | Component of a steam turbine plant, steam turbine plant, use and production method of such a component. |
JP4886271B2 (en) | 2005-10-31 | 2012-02-29 | 株式会社東芝 | Steam turbine and hydrophilic coating material thereof |
JP5244495B2 (en) * | 2008-08-06 | 2013-07-24 | 三菱重工業株式会社 | Parts for rotating machinery |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54139891A (en) * | 1978-04-24 | 1979-10-30 | Nagaoka Kk | Specific work metal material and its manufacturing method |
-
1985
- 1985-05-09 JP JP60096669A patent/JPH0751744B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS61257466A (en) | 1986-11-14 |
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Legal Events
Date | Code | Title | Description |
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EXPY | Cancellation because of completion of term |