EP0760869A1 - Alliage de base intermetallique nickel-aluminium - Google Patents

Alliage de base intermetallique nickel-aluminium

Info

Publication number
EP0760869A1
EP0760869A1 EP95920844A EP95920844A EP0760869A1 EP 0760869 A1 EP0760869 A1 EP 0760869A1 EP 95920844 A EP95920844 A EP 95920844A EP 95920844 A EP95920844 A EP 95920844A EP 0760869 A1 EP0760869 A1 EP 0760869A1
Authority
EP
European Patent Office
Prior art keywords
chromium
tantalum
nial
alloy
alloy according
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.)
Granted
Application number
EP95920844A
Other languages
German (de)
English (en)
Other versions
EP0760869B1 (fr
Inventor
Gerhard Sauthoff
Benedikt Zeumer
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.)
HC Starck GmbH
Siemens AG
Original Assignee
HC Starck GmbH
Siemens AG
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
Application filed by HC Starck GmbH, Siemens AG filed Critical HC Starck GmbH
Publication of EP0760869A1 publication Critical patent/EP0760869A1/fr
Application granted granted Critical
Publication of EP0760869B1 publication Critical patent/EP0760869B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ

Definitions

  • the invention relates to an intermetallic nickel aluminum base alloy which has the binary phase NiAl.
  • the invention further relates to the use of the intermetallic nickel-aluminum base alloy.
  • DE-AS 18 12 144 describes a process for producing a high-strength nickel-aluminum material with good resistance to oxidation.
  • nickel powder is mixed with aluminum powder and then pressed and cold-formed, so that a self-supporting and coherent shaped body with a fibrous or lamenarene
  • connection NissAl is also created. This solid solution as well as the compound Ni3Al could be verified with X-ray analysis. The extent to which other connections between nickel and aluminum can be achieved with the method cannot be found in the design specification.
  • the object of the invention is to improve the thermo-mechanical properties of a nickel-aluminum alloy. These include in particular the heat resistance, the oxidation resistance and the thermal shock resistance. Another object of the invention is to provide a use of such an improved nickel-aluminum alloy.
  • the object directed to a nickel-aluminum alloy is achieved by an intermetallic nickel-aluminum base alloy which predominantly has the binary phase NiAl and additionally chromium and tantalum, wherein the total proportion of chromium and tantalum is a maximum of 12 at.%.
  • the proportion of the binary phase NiAl is preferably between 70 to 95 at .-%, in particular between 85 and 90 at * t .-%.
  • the preferred content ranges for tantalum and chromium are 0.3 to 3.8 at .-% and 1.0 to 9.0 at .-%. Within these ranges, 0.3 to 0.9 at.% Tantalum and 1.0 to 3 at.% Chromium or 1.7 to 3.0 at.% Tan tal and 6.0 to 9 are preferred .0 at .-% chromium used.
  • the ratio of tantalum to chromium is preferably 1: 3 or less. With such a ratio, the concentration of substitution elements in the NiAl reaches a maximum.
  • the ratio of tantalum and chromium precipitations occur in the coarse, mul- tular Laves phase in the non-metallic nickel-aluminum base alloy on the grain boundaries of the binary phase NiAl, on which the elements Ni, Al, Cr and Ta can be involved.
  • there are excretions of finely divided Laves phase and ⁇ -chromium within the NiAl grains It is preferred that the structure of 5 to 11% by volume Laves phase, 3 to 10% by volume precipitates in NiAl and one
  • a structure has proven to be particularly advantageous which comprises approximately 11 vol.% Laves phase on the grain boundaries and approximately 10 vol.% Precipitates in the NiAl and NiAl as the remainder.
  • a further improvement in certain properties results if at least one element from the group iron, molybdenum, tungsten and hafnium is present in the alloy in an amount of up to 1 at.%, But not more than 3 at are included.
  • the alloy can also contain trace elements such as oxygen, nitrogen and sulfur, as well as production-related impurities.
  • the coarse or fine-particle multinary Laves phases and ⁇ -chromium are formed. These excretions are usually based on gussets points of different NiAl grains. Higher than the specified amounts of alloying elements tantalum or chromium can lead to an undesirable increase in the amount of precipitates. If the volume fractions of Laves phase increases too much, a cellular structure arises in which the Laves phase takes over the function of the matrix. Too large a proportion of Laves phase in the structure makes the intermetallic alloy brittle and difficult to process.
  • the object aimed at using the alloy is achieved according to the invention in that components of a gas turbine, in particular components exposed to high temperatures, such as gas turbine blades, are produced with the NiAl base alloy.
  • a component of a gas turbine, in particular a turbine blade, made from the base alloy is particularly suitable due to the high oxidation resistance for continuous use at high temperatures, for example above 1100 ° C., in particular at 1350 ° C.
  • an additional coating with protective layers can be dispensed with in such a component, depending on the requirements.
  • the intermetallic nickel-aluminum base alloy is generally also suitable as a material for the production of objects which must have high strength, high heat resistance, good toughness, good oxidation resistance and good thermal shock resistance.
  • the strength lies here with a 0.2% proof stress at room temperature of over 600 MPa.
  • the heat resistance lies at the 0.2% proof stress at over 200 MPa at 800 ° C and at over 90 MPa at 1000 ° C.
  • the toughness is at least 7 MPa / m and the oxidation resistance is of the order of magnitude
  • composition (in at.%) Of alloys sought is given in Table 1 below.
  • the structure of the structure ie the grain size, the distribution of precipitates and the size of the precipitate, varies greatly with the manufacturing process.
  • the distribution of the Laves phase particles is homogenized by thermodynamic treatments, extrusion (SP) or by using the powder metallurgical production route (PM).
  • SP thermodynamic treatments
  • PM powder metallurgical production route
  • the mechanical properties of the alloys are also heavily dependent on the selected manufacturing process. The following production routes for these alloys were followed:
  • Powder metallurgy by inert gas atomization and subsequent hot isostatic pressing at 1250 ° C.
  • the creep resistance (in MPa) of the alloys tested in the compression test (secondary stationary creep resistance than Funk ⁇ tion of the strain rate [1 / s] at 1000 ° C and 1100 ° C *) is shown in Table 3 below.
  • the creep strengths of this alloy are higher than the creep strengths of comparable intermetallic phases, for example higher than the creep strength of binary NiAl or NiAlCr alloys.
  • Table 4a gives a comparison of the 0.2% proof stress (in MPa) in the compression test of a conventional superalloy, a binary NiAl alloy and a NiAl-Ta-Cr alloy.
  • the superiority of the alloy according to the invention proves at temperatures above 1000 ° C.
  • the NiAl-Ta-Cr alloy Compared to conventional superalloys, the NiAl-Ta-Cr alloy has the advantage that it also has sufficient strength above 1050 ° C to 1150 ° C. There is no sudden drop in strength in this alloy due to the dissolution of the solidified phase.
  • Table 5 shows a comparison of the values of K ⁇ values of various ceramics known from industry data and of the powder-metallurgical processed NiAl-Ta-Cr alloy produced.
  • the alloy has a good oxidation resistance of the order of magnitude 5 * 10- ⁇ g 2 c " ⁇ s, which is therefore equal to or better than the oxidation resistance of binary NiAl.
  • no protective layers for example, are formed at high temperatures ceramic material, this eliminates the problem of the connection between ceramic and metallic components.
  • Adequate thermal shock resistance is given. At 1350 ° C, 500 temperature cycles of the alloy are achieved without damaging the material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

Un alliage de base intermétallique nickel-aluminium a une structure constituée surtout de la phase binaire NiAl et contient en outre les éléments chrome et tantale. La proportion des éléments chrome et tantale s'élève au total à 12 % en atomes maximum. Les teneurs préférées sont comprises entre 0,3 et 3,8 % en atomes pour le tantale et entre 1,0 et 9,0 % en atomes pour le chrome. Cet alliage intermétallique de nickel-aluminium se caractérise en particulier par une haute résistance à l'oxydation à des températures élevées, par exemple 1350 °C. Il se prête donc à la production de pièces exposées à une haute sollicitation thermique permanente, telles que des pales de turbines à gaz. Cette haute résistance à l'oxydation permet le cas échéant de se passer de couches supplémentaires de protection contre l'oxydation.
EP95920844A 1994-05-21 1995-05-19 Alliage de base intermetallique nickel-aluminium Expired - Lifetime EP0760869B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4417936 1994-05-21
DE4417936A DE4417936C1 (de) 1994-05-21 1994-05-21 Nickel-Aluminium-Legierung
PCT/EP1995/001921 WO1995032314A1 (fr) 1994-05-21 1995-05-19 Alliage de base intermetallique nickel-aluminium

Publications (2)

Publication Number Publication Date
EP0760869A1 true EP0760869A1 (fr) 1997-03-12
EP0760869B1 EP0760869B1 (fr) 2001-04-25

Family

ID=6518734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95920844A Expired - Lifetime EP0760869B1 (fr) 1994-05-21 1995-05-19 Alliage de base intermetallique nickel-aluminium

Country Status (8)

Country Link
EP (1) EP0760869B1 (fr)
JP (1) JPH10500453A (fr)
KR (1) KR100359187B1 (fr)
CN (1) CN1044493C (fr)
CZ (1) CZ342696A3 (fr)
DE (2) DE4417936C1 (fr)
RU (1) RU2148671C1 (fr)
WO (1) WO1995032314A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE521471C2 (sv) 2001-03-27 2003-11-04 Koncentra Holding Ab Kolvring och beläggning på en kolvring innefattande ett kompositmaterial av en keram och en intermetallisk förening
CN100422369C (zh) * 2006-12-13 2008-10-01 北京航空航天大学 Ti改性NiAl-Cr(Mo)多相共晶结构金属间化合物
BR102013019686B1 (pt) 2013-08-01 2020-11-03 Mahle Metal Leve S/A anel de pistão e seu processo de fabricação
CN104073688B (zh) * 2014-06-19 2016-08-17 湖南科技大学 一种NiAl-2.5Ta-7.5Cr合金作为碱腐蚀工况下自润滑耐磨材料的应用
CN104294328B (zh) * 2014-10-23 2017-02-01 上海应用技术学院 一种镍钼铝稀土镀层及其制备方法
DE102017109156A1 (de) 2016-04-28 2017-11-02 Hochschule Flensburg Hochwarmfester Werkstoff und dessen Herstellung
CN115595486B (zh) * 2022-10-14 2024-03-22 中国科学院金属研究所 一种高温涡轮叶片叶尖耐磨切削涂层及其制备方法和应用

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1812144C3 (de) * 1967-12-06 1974-04-18 Cabot Corp., Boston, Mass. (V.St.A.) Verfahren zur Herstellung eines hochfesten Nickel-Aluminium-WerkstofTs
US5116691A (en) * 1991-03-04 1992-05-26 General Electric Company Ductility microalloyed NiAl intermetallic compounds

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9532314A1 *

Also Published As

Publication number Publication date
JPH10500453A (ja) 1998-01-13
CZ342696A3 (en) 1997-08-13
CN1044493C (zh) 1999-08-04
DE4417936C1 (de) 1995-12-07
KR100359187B1 (ko) 2003-01-24
KR970703438A (ko) 1997-07-03
RU2148671C1 (ru) 2000-05-10
DE59509221D1 (de) 2001-05-31
EP0760869B1 (fr) 2001-04-25
WO1995032314A1 (fr) 1995-11-30
CN1150826A (zh) 1997-05-28

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