JP2005350771A - 改良された酸化物安定領域を備えたニッケルアルミナイド・コーティング - Google Patents
改良された酸化物安定領域を備えたニッケルアルミナイド・コーティング Download PDFInfo
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Abstract
【解決手段】 本発明の1つの実施形態において、NiAlオーバーレイ・ボンドコート組成物は、NiAl合金を含む。該合金は、Zrと、該合金の酸化により実質的に正方晶の構造を含む安定化ジルコニアを備える安定化酸化物構造を形成するのに有効な量の少なくとも1種類の改質用元素とを含む。該正方晶構造は、熱サイクルで相変化せず、単斜晶構造又は実質的に正方晶でない単斜晶と正方晶との構造に戻らないように安定化される。
【選択図】 図2
Description
例えば、最初の元素に関して表1に示されるように、Zr及びCaを備えるNiAlボンドコートが、ボンドコーティングシステムとして選択された。該システムはまた、Zr含量を含む全体の改質用元素(ME)(又は全体の反応性元素含量(RE))の約0.2原子%又は約1%を含むように選択された。縦列4から5を参照のこと。次いで、相平衡状態図の分析に基づき、Zr酸化物内の約4ないし約15モル%のCa酸化物(ME酸化物)が、熱サイクル時に不安定な単斜晶相に復帰せずに安定した実質的に正方晶相を維持するために好適であったことが確認された。上述の値を用いて、ボンドコーティング20組成物内に含まれるべきCaの量を容易に決定することができる(表1の縦列4から5を参照)。従って、縦列4に基づき、約0.008から0.03原子%のCa、及び約0.192原子%から約0.17原子%まで下がったZrを、それぞれボンドコート20の組成物内で用いて、安定性のための約4ないし約15である上記で参照された望ましいモル%を得ることができる。
(1)置換反応(例えば1モルのYO1.5を1モルのZrO2に置き換える)
(2)コーティング内に望まれる全体の反応性元素(RE)含量
(3)ZrO2を安定化させるために必要とされるME酸化物の量。
最小限レベル(概略)では:
・ Y(原子%)=(0.5原子%の全RE含量)×(4%又は4/100)=0.02原子%
・ Zr=0.50−0.02=0.48;
最大限レベル(概略)では:
・ Y(原子%)=(0.5原子%の全RE含量)×(18%又は18/100)=0.09原子%
・ Zr=0.50−0.09=0.41原子%
一般的に、下記の計算を完遂することができる。
・ 最小ME含量=(全RE含量)×(安定化に必要な最小モル比率)
・ 最大ME含量=(全RE含量)×(安定化に必要な最大モル比率)
・ 最小Zr含量=(全RE含量)−(最大ME含量)
・ 最大Zr含量=(全RE含量)−(最小ME含量)
該表内の計算は、このような計算の実施例を示し、種々の改質用元素、これらのMEの酸化物が相安定性をもたらす範囲、及び2つの異なる選択された全体の反応性元素含量の合計に関して完遂することができる。当然、これらの計算は、任意のZr又は他の元素レベルもしくは組み合わせ、及びコーティングに望まれる固定された任意のME酸化物含量に対して調整することができる。
18 遮熱コーティングシステム
20 ボンドコート
22 セラミック遮熱コーティング
26 アルミニウム表面層(アルミナスケール)
Claims (10)
- NiAl合金から構成されるNiAlオーバーレイ・ボンドコーティング組成物であって、前記合金が、Zrと、前記合金の酸化により実質的な正方晶構造を含む安定化ジルコニアを有する安定化酸化構造を形成するのに有効な量の少なくとも1種類の改質用元素とを含み、前記正方晶構造が、熱サイクルにより相変化せず、且つ単斜晶構造又は実質的に正方晶でない単斜晶と正方晶との構造に戻らないように安定化されることを特徴とする組成物。
- 前記元素が、前記ジルコニア内に約4ないし約18モル%のYO1.5を形成するのに有効な量のYであり、前記YO1.5が前記ジルコニアを安定化することを特徴とする請求項1に記載の組成物。
- 前記元素が、前記ジルコニア内に約4ないし約12モル%のMgOを形成するのに有効な量のMgであり、前記MgOが前記ジルコニアを安定化することを特徴とする請求項1に記載の組成物。
- 前記安定化酸化物構造が、2価安定化用酸化物、3価安定化用酸化物、4価安定化用酸化物、及び5価安定化用酸化物からなる群から選ばれる少なくとも1種類の酸化物を含む請求項1に記載の組成物。
- 前記2価安定化用酸化物が、Ca、Mg及びこれらの組み合わせの酸化物からなる群から選ばれ、前記3価安定化用酸化物が、Dy、La、Eu、Sc、Y、Er、Gd及びこれらの組み合わせの酸化物からなる群から選ばれ、前記4価安定化用酸化物が、Taの酸化物であり、前記5価安定化用酸化物が、Ce及びTiの酸化物から選ばれることを特徴とする請求項4に記載の組成物。
- 前記合金が、約0.2ないし約1原子%のZrを含む請求項1に記載の組成物。
- 前記合金が、i)Zrと少なくとも1種類の改質用元素とを合計で約0.2原子%含み、ii)前記少なくとも1種類の改質用元素が、0.008から0.03原子%のCa、0.008から0.024原子%のMg、0.008から0.04原子%のDy、0.008から0.026原子%のEu、0.008から0.034原子%のSc、0.008から0.04原子%のLa、0.008から0.036原子%のY、0.008から0.04原子%のEr、0.008から0.04原子%のGd、0.02から0.08原子%のCe、及び0.01から0.04原子%のTiからなる群から選ばれることを特徴とする請求項1に記載の組成物。
- 前記合金が、i)Zrと少なくとも1種類の改質用元素とを合計で約1原子%含み、ii)前記少なくとも1種類の改質用元素が、0.04から0.15原子%のCa、0.04から0.12原子%のMg、0.04から0.2原子%のDy、0.04から0.13原子%のEu、0.04から0.17原子%のSc、0.04から0.2原子%のLa、0.04から0.18原子%のY、0.04から0.2原子%のEr、0.04から0.2原子%のGd、0.01から0.4原子%のCe、及び0.05から0.02原子%のTiからなる群から選ばれることを特徴とする請求項1に記載の組成物。
- 安定した熱成長酸化物構造を形成する方法であって、
NiAl合金から構成され、該NiAl合金が、Zrと、前記合金の酸化により実質的な正方晶構造を含む安定化ジルコニアを有する安定化酸化物構造を形成するのに有効な量の少なくとも1種類の改質用元素とを含むNiAlオーバーレイ・ボンドコート(20)を準備する段階と、
前記合金を熱に曝し、これによって前記合金を酸化して安定な熱成長酸化物構造を形成し、前記正方晶構造が加熱又は熱サイクルにより相変化せず、且つ単斜晶構造又は実質的に正方晶でない単斜晶と正方晶との構造に戻らないようにする段階と、
を含む方法。 - 前記安定化酸化物構造が、少なくとも1種類の改質用元素の酸化物を前記ジルコニア内に約4から20モル%を含み、該酸化物が前記ジルコニアを安定化することを特徴とする請求項9に記載の方法。
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US10/855,687 US7070866B2 (en) | 2004-05-27 | 2004-05-27 | Nickel aluminide coating with improved oxide stability |
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JP2005350771A5 JP2005350771A5 (ja) | 2008-07-10 |
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Cited By (4)
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JP2010511783A (ja) * | 2006-12-01 | 2010-04-15 | シーメンス エナジー インコーポレイテッド | ボンドコート組成物及び自己修復が可能なその配列 |
JP2012512331A (ja) * | 2008-12-17 | 2012-05-31 | ゼネラル・エレクトリック・カンパニイ | 耐衝撃性遮熱コーティング、コーティングされた物品、およびコーティング方法 |
JP2013525236A (ja) * | 2010-03-16 | 2013-06-20 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | 非反応性のろう付けによりSiC系材料製の部品を接合する方法、ろう付け組成物、ならびにこの方法により得られる接合部および組付体 |
JP2014185636A (ja) * | 2013-02-15 | 2014-10-02 | Alstom Technology Ltd | 耐エロージョン性及び耐コロージョン性のコーティング系を備えるターボ機械部品並びに当該ターボ機械部品の製造方法 |
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JP2007262447A (ja) * | 2006-03-27 | 2007-10-11 | Mitsubishi Heavy Ind Ltd | 耐酸化膜及びその形成方法、遮熱コーティング、耐熱部材、及びガスタービン |
EP1932935A1 (de) * | 2006-12-05 | 2008-06-18 | Siemens Aktiengesellschaft | Verfahren zur Herstellung einer Turbinenschaufel mit einem Oxid auf einer metallischen Schicht, eine Turbineschaufel ,Verwendung einer solchen Turbinenschaufel und ein Verfahren zum Betreiben einer Turbine |
US7763326B2 (en) | 2006-12-20 | 2010-07-27 | United Technologies Corporation | Photocurable maskant composition and method of use |
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US4035191A (en) * | 1974-05-09 | 1977-07-12 | Corning Glass Works | Tetragonally stabilized zirconia ceramic |
US5824423A (en) * | 1996-02-07 | 1998-10-20 | N.V. Interturbine | Thermal barrier coating system and methods |
US5975852A (en) * | 1997-03-31 | 1999-11-02 | General Electric Company | Thermal barrier coating system and method therefor |
SG71151A1 (en) * | 1997-09-17 | 2000-03-21 | Gen Electric | Bond coat for a thermal barrier coating system and method therefor |
EP0985745B1 (en) | 1998-09-08 | 2006-07-12 | General Electric Company | Bond coat for a thermal barrier coating system |
US6153313A (en) * | 1998-10-06 | 2000-11-28 | General Electric Company | Nickel aluminide coating and coating systems formed therewith |
US6291084B1 (en) * | 1998-10-06 | 2001-09-18 | General Electric Company | Nickel aluminide coating and coating systems formed therewith |
DE19926669A1 (de) * | 1999-06-08 | 2000-12-14 | Abb Alstom Power Ch Ag | NiAl-beta-Phase enthaltende Beschichtung |
US6682827B2 (en) * | 2001-12-20 | 2004-01-27 | General Electric Company | Nickel aluminide coating and coating systems formed therewith |
US6746783B2 (en) | 2002-06-27 | 2004-06-08 | General Electric Company | High-temperature articles and method for making |
-
2004
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2010511783A (ja) * | 2006-12-01 | 2010-04-15 | シーメンス エナジー インコーポレイテッド | ボンドコート組成物及び自己修復が可能なその配列 |
JP2012512331A (ja) * | 2008-12-17 | 2012-05-31 | ゼネラル・エレクトリック・カンパニイ | 耐衝撃性遮熱コーティング、コーティングされた物品、およびコーティング方法 |
JP2013525236A (ja) * | 2010-03-16 | 2013-06-20 | コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ | 非反応性のろう付けによりSiC系材料製の部品を接合する方法、ろう付け組成物、ならびにこの方法により得られる接合部および組付体 |
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US10041360B2 (en) | 2013-02-15 | 2018-08-07 | Ansaldo Energia Switzerland AG | Turbomachine component with an erosion and corrosion resistant coating system and method for manufacturing such a component |
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EP1600518A2 (en) | 2005-11-30 |
US7070866B2 (en) | 2006-07-04 |
EP1600518A3 (en) | 2006-03-29 |
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