EP0425972B1 - Alliage réfractaire, résistant à l'oxydation et à la corrosion, à base d'un composé intermétallique - Google Patents

Alliage réfractaire, résistant à l'oxydation et à la corrosion, à base d'un composé intermétallique Download PDF

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Publication number
EP0425972B1
EP0425972B1 EP90120262A EP90120262A EP0425972B1 EP 0425972 B1 EP0425972 B1 EP 0425972B1 EP 90120262 A EP90120262 A EP 90120262A EP 90120262 A EP90120262 A EP 90120262A EP 0425972 B1 EP0425972 B1 EP 0425972B1
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EP
European Patent Office
Prior art keywords
corrosion
atomic
oxidation
intermetallic compound
weight
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
Application number
EP90120262A
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German (de)
English (en)
Other versions
EP0425972A1 (fr
Inventor
Mohamed Dr. Nazmy
Markus Staubli
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.)
ABB Asea Brown Boveri Ltd
ABB AB
Original Assignee
ABB Asea Brown Boveri Ltd
Asea Brown Boveri AB
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 ABB Asea Brown Boveri Ltd, Asea Brown Boveri AB filed Critical ABB Asea Brown Boveri Ltd
Priority to AT9090120262T priority Critical patent/ATE105593T1/de
Publication of EP0425972A1 publication Critical patent/EP0425972A1/fr
Application granted granted Critical
Publication of EP0425972B1 publication Critical patent/EP0425972B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/06—Alloys based on chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/18—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on silicides

Definitions

  • High-temperature alloys with high resistance to oxidation and corrosion based on intermetallic compounds which are suitable for directional solidification and complement conventional nickel-based superalloys.
  • the invention relates to the further development and improvement of the alloys based on an intermetallic compound with further additives which increase the heat resistance and the resistance to oxidation.
  • Intermetallic compounds have some interesting properties that make them appear attractive as construction materials in the medium and higher temperature range. Among other things, this includes their low density compared to superalloys, which only reaches about 2/3 of the value for Ni superalloys. Their technical usability in the present form is opposed to their brittleness. The former can be improved by adding boron, with higher strength values also being achieved. As possible and partly already introduced intermetallic compounds are known among other things nickel aluminides, nickel silicides and titanium aluminides as constituents. A molybdenum silicide is also used as the heating conductor material.
  • the invention has for its object to provide a relatively light alloy with high oxidation and corrosion resistance, especially against sulfidation at high temperatures and high heat resistance in the temperature range of 600 to 1200 ° C, which is well suited for directional solidification and essentially from one high-melting intermetallic compound.
  • the alloy should have a hot flow limit of at least 800 MPa in the temperature range from 400 to 1000 ° C.
  • the figure shows a graphical representation of the mechanical material properties as a function of temperature for new alloys based on an intermetallic compound of the chromium silicide type.
  • the figure relates to a representation of the mechanical properties as a function of the temperature T in ° C for different alloys.
  • Curve 1 represents the yield point ⁇ 0.2 (0.2% proof stress) in MPa for an alloy with 25 at% Si; 14 at% Mo; 1 at% W; Rest Cr represents 2 is the associated warm hardness HV 0.3 in Vickers units (kg / mm2).
  • Curve 3 relates to the yield point ⁇ 0.2 for an alloy with 25 at% Si; 13 at% Mo; 2 at% W; 0.5 at% B; Rest Cr. 4 is the associated hot hardness HV 0.3 .
  • Curves 1 and 3 are up to a temperature of approx. 800 ° C in the same order of magnitude as comparison curves 5 and 6.
  • the heat resistance of conventional nickel-based superalloys drops relatively steeply above this temperature, it remains with the new alloys the base of Cr3Si up to 1200 ° C almost constant.
  • the hot stretching limit of the new alloys is around 3 1/2 times that of the nickel-based alloys. The range of use of these alloys should reach up to approx. 1400 ° C.
  • a further improvement of the mechanical properties through a suitable heat treatment is within the realm of possibility. There is also the possibility of improvement by directional solidification, for which the alloy is particularly suitable.
  • the Si has a favorable effect on the high-temperature corrosion resistance, particularly against sulfur, while the Mo further increases the heat resistance. The latter also applies to the influence of W.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (3)

  1. Alliage haute température résistant à l'oxydation et à la corrosion et ayant pour base un composé intermétalligue à point de fusion élevé, caractérisé en ce que le composé intermétalligue est un siliciure de chrome Cr₃Si et en ce que l'alliage présente la composition suivante :
       Si = 23 - 27 At. %
       Mo = 5 - 20 At. %
       W = 1 - 3 At. %
       B = 0 - 1 At. %
       Cr = reste
    et en ce qu'il est constitué pour au moins 90 % en volume d'un mélange des phases intermétalligues Cr₃Si et Mo₃Si.
  2. Alliage haute température selon la revendication 1, caractérisé en ce qu'il présente la composition suivante :
       Si = 25 At. %
       Mo = 14 At. %
       W = 1 At. %
       Cr = reste
  3. Alliage haute température selon la revendication 1, caractérisé en ce qu'il présente la composition suivante :
       Si = 25 At. %
       Mo = 13 At. %
       W = 2 At. %
       B = 0,5 At. %
       Cr = reste
EP90120262A 1989-11-03 1990-10-22 Alliage réfractaire, résistant à l'oxydation et à la corrosion, à base d'un composé intermétallique Expired - Lifetime EP0425972B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT9090120262T ATE105593T1 (de) 1989-11-03 1990-10-22 Oxydations- und korrosionsbestaendige hochtemperaturlegierung auf der basis einer intermetallischen verbindung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3976/89A CH679312A5 (fr) 1989-11-03 1989-11-03
CH3976/89 1989-11-03

Publications (2)

Publication Number Publication Date
EP0425972A1 EP0425972A1 (fr) 1991-05-08
EP0425972B1 true EP0425972B1 (fr) 1994-05-11

Family

ID=4267477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120262A Expired - Lifetime EP0425972B1 (fr) 1989-11-03 1990-10-22 Alliage réfractaire, résistant à l'oxydation et à la corrosion, à base d'un composé intermétallique

Country Status (4)

Country Link
EP (1) EP0425972B1 (fr)
AT (1) ATE105593T1 (fr)
CH (1) CH679312A5 (fr)
DE (1) DE59005675D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007302A1 (fr) * 1991-10-10 1993-04-15 Battelle Memorial Institute Alliages metalliques refractaires resistants a l'oxydation
US5330590A (en) * 1993-05-26 1994-07-19 The United States Of America, As Represented By The Administrator Of The National Aeronautics & Space Administration High temperature creep and oxidation resistant chromium silicide matrix alloy containing molybdenum
US5718867A (en) * 1994-10-17 1998-02-17 Asea Broan Boveri Ag Alloy based on a silicide containing at least chromium and molybdenum

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943228A (en) * 1956-10-22 1963-12-04 Commw Of Australia Improved chromium-tungsten-silicon alloys
GB842487A (en) * 1956-12-04 1960-07-27 Union Carbide Corp Improvements in and relating to admixtures of unalloyed powder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993007302A1 (fr) * 1991-10-10 1993-04-15 Battelle Memorial Institute Alliages metalliques refractaires resistants a l'oxydation
US5330590A (en) * 1993-05-26 1994-07-19 The United States Of America, As Represented By The Administrator Of The National Aeronautics & Space Administration High temperature creep and oxidation resistant chromium silicide matrix alloy containing molybdenum
US5718867A (en) * 1994-10-17 1998-02-17 Asea Broan Boveri Ag Alloy based on a silicide containing at least chromium and molybdenum

Also Published As

Publication number Publication date
ATE105593T1 (de) 1994-05-15
DE59005675D1 (de) 1994-06-16
CH679312A5 (fr) 1992-01-31
EP0425972A1 (fr) 1991-05-08

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