JP7275449B2 - ガスタービンのタービンブレードの耐食および耐エロージョンコーティング - Google Patents
ガスタービンのタービンブレードの耐食および耐エロージョンコーティング Download PDFInfo
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Description
・基材の表面と第2層との間に配置された第1層が接着促進層として形成されていて、
・第2層は、柱状構造を有する延性のある金属層であり、
・第2層に対して、前記基材とは逆側に配置された第3層は、少なくとも20GPaの硬度を有するセラミック酸化物層である。
本発明をさらに改良するために、以下の任意選択可能な可能性が存在する。
-中間層は、Crおよび/またはAlCrおよび/またはAl-Cr-Oからなる層系を含むことができ、Cr層が存在する場合には、それぞれの厚さが1μm未満である。
-好ましくは、中間層は、AlCrとAl-Cr-Oとからなる層系からなる。
-機能層は、単層の層または多層の層でありうる。本発明の意味合いでの多層の層は、明らかに好適な場合、直接重ね合わされた複数の層の積み重ねであり、これらの層のそれぞれが、機能層について請求項1で要求される組成をそれぞれ有することであると理解される。特許法の下で本発明を回避しようとする試みを阻むために、機能性を実質的に悪化させない層が、必要な組成を有する複数の機能層間に口実として配置されている場合には、本発明の意味合いでの多層の層が依然として存在しうると例外的にのみ言えるであろう。
-類似の定義は、多層の層からなる中間層についても、該当し、転用される。それにより、本発明の意味合いでの中間層を形成する多層の層は、明らかに好ましくは、複数の層を直接重ねて積層したものであると理解され、各層が中間層について該当する請求項によって要求される組成物を有する。
-機能層が多層構造である場合、その中のAl/Crの比率および/もしくはO/Nの比率が、層厚の少なくとも一部にわたって周期的に変化する、ならびに/または、層厚の少なくとも一部にわたって非周期的に変化する場合に有利である。
-特に好ましいのは、機能層中のAl原子対Cr原子の比率(Al/Cr)が4と1との間であり、さらに好ましくは2と1.5との間にある場合である。
-さらに、機能層中のO原子対N原子の比率(O/N)が0.2と1.5との間、特に好ましくは0.4と1との間にあることが好ましい。
-機能層の押し込み硬さ(HIT)が、少なくとも25GPa、好ましくは30GPaより大きい場合に有利であり、この押し込み硬さ(HIT)は、ISO14577-1に準拠して、室温でフィッシャースコープ(Fisherscope)H100cでのマルテンス硬度計測によって導き出される値である。
-機能層の弾性率(EIT)は、有利な場合には少なくとも280GPa、好ましくは300GPaより大きく、この弾性率(EIT)は、ISO14577-1に準拠して、室温でフィッシャースコープ(Fisherscope)H100cでのマルテンス硬度計測によって導き出される値である。
-好ましくは、粗度はRaが0.1μm~0.6μm、および/またはRzが1μm~8μmである。
次に、本発明の作用について以下を説明しなければならない。
機能層のX線回折スペクトルは、図1に示すように、X線回折における立方晶(fcc)CrNおよび立方晶(fcc)AlNのピークに加えて、少なくとも1つの酸化物の追加ピークを示す場合に特に有利である。このピークがCr-Oに由来する、および/または六方晶構造を有するAl-Cr-Oに由来する場合は特に有利である。
以下、本発明を様々な実施形態に基づいて、図を用いて例示的に説明する。
原則として、既に分けた請求項には全く依存せず、これらの組み合わせによっても、以下のいずれかの段落の特徴を有する部品についても保護が請求されると言える。
タービン特にガスタービンの部品であって、この部品は例えばタービンブレードであってもよく、この部品は、エロ-ジョンおよび腐食に耐性のあるコーティングを有しており、この部品が際立っている点は、このコーティングが部品基材に塗布され、機能層と中間層とを含み、この中間層はタービンブレード基材と機能層との間に配置されている、部品(段落1)。
前記部品が、中間層がCrおよび/またはAlCrおよび/またはAl-Cr-Oからなる層系を含む点が際立っている、段落1に記載の部品。
前記中間層が、AlCrとAl-Cr-Oとからなる層系からなる点が際立っている、直前の段落2に記載の部品。
前記機能層が、実質的にAl、Cr、OおよびNの元素を含む点が際立っている、段落2に記載の部品。
前記機能層が単層の層または多層の層である点が際立っている、本章の上記段落のいずれかに記載の部品。
前記機能層は、Al/Crの比率および/もしくはO/Nの比率が、層厚の少なくとも一部にわたって周期的に変化する、ならびに/または、層厚の少なくとも一部にわたって非周期的に変化する多層構造を含む点が際立っている、段落5に記載の部品。
前記機能層中のAl原子対Cr原子の比率(Al/Cr)が4と1との間であり、好ましくは2と1.5との間にある点が際立っている、段落5に記載の部品。
前記機能層中のO原子対N原子の比率(O/N)が0.2と1.5との間、好ましくは0.4と1との間にある点が際立っている、段落5に記載の部品。
前記機能層の押し込み硬さが、少なくとも25GPa、好ましくは30GPaより大きい点が際立っている、段落5に記載の部品。
前記機能層の弾性率が、少なくとも280GPa、好ましくは300GPaより大きい点が際立っている、段落5に記載の部品。
前記機能層が、X線回折における立方晶CrNのピークおよび立方晶AlNのピークに加えて、少なくとも1つの酸化物の追加ピークをさらに有する点が際立っている、段落5に記載の部品。
前記追加ピークのうちの少なくとも1つが、六方晶(例えば、エスコラ石および/またはコランダム)相のピークである点が際立っている、段落11に記載の部品。
段落1に記載の部品ないしコーティングを製造するための方法において、その製造のために、陰極アーク蒸着方法および/またはスパッタリング方法を採用する点が際立っている、方法。
前記コーティングされるべき表面が高クロム含有鋼表面であり、および/またはNi-Cr、Ni-Co、Ni-Cr-Coを含有する基材表面であり、および/または、1つ以上の超合金を含有する基材表面好ましくはアルミナイドを含有する(Al-Ni、Al-Ti、Al-Hf)基材表面である、段落13に記載の方法。
Claims (11)
- タービンの部品であって、前記部品は、耐エロージョン性と耐食性とを向上させるためのコーティングを有し、前記コーティングが前記部品上に直接塗布されている部品において、前記コーティングは、機能層と中間層とからなり、前記中間層は、前記タービンブレード基材と前記機能層との間に配置されていて、前記機能層は、Al-Cr-O-Nからなり、
前記中間層は、Crの単層、AlCrの単層、およびAl-Cr-Oの単層の順で構成される層系を含むことを特徴とする、部品。 - 前記機能層が単層の層または多層の層であることを特徴とする、請求項1に記載の部品。
- 前記機能層は、Al/Crの比率および/もしくはO/Nの比率が、層厚の少なくとも一部にわたって周期的に変化する、ならびに/または、層厚の少なくとも一部にわたって非周期的に変化する多層構造を含むことを特徴とする、請求項2に記載の部品。
- 前記機能層中のAl原子対Cr原子の比率(Al/Cr)が4と1との間にあることを特徴とする、請求項3に記載の部品。
- 前記機能層中のO原子対N原子の比率(O/N)が0.2と1.5との間にあることを特徴とする、請求項3に記載の部品。
- 前記機能層の押し込み硬さが、少なくとも25GPaより大きいことを特徴とする、請求項3に記載の部品。
- 前記機能層の弾性率が、少なくとも280GPaより大きいことを特徴とする、請求項3に記載の部品。
- 前記機能層が、X線回折における立方晶CrNのピークおよび立方晶AlNのピークに加えて、少なくとも1つの酸化物の追加ピークをさらに有することを特徴とする、請求項3に記載の部品。
- 前記追加ピークのうちの少なくとも1つが、六方晶相のピークであることを特徴とする、請求項8に記載の部品。
- 請求項1に記載の部品を製造するための方法において、その製造のために、陰極アーク蒸発方法および/またはスパッタリング方法が採用され、かつ前記部品のクリーニングされた表面上に、最初に、Crの単層、AlCrの単層、およびAl-Cr-Oの単層の順で含む前記中間層を析出させ、その後直ちにAl-Cr-O-Nからなる前記機能層を析出させることを特徴とする、方法。
- 前記コーティングされるべき表面が高クロム含有鋼表面であり、および/またはNi-Cr、Ni-Co、Ni-Cr-Coを含有する基材表面であり、および/または、1つ以上の超合金を含有する基材表面である、請求項10に記載の方法。
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