EP0425972A1 - Alliage rÀ©fractaire, résistant à l'oxydation et à la corrosion, à base d'un composé intermétallique - Google Patents
Alliage rÀ©fractaire, résistant à l'oxydation et à la corrosion, à base d'un composé intermétallique Download PDFInfo
- Publication number
- EP0425972A1 EP0425972A1 EP90120262A EP90120262A EP0425972A1 EP 0425972 A1 EP0425972 A1 EP 0425972A1 EP 90120262 A EP90120262 A EP 90120262A EP 90120262 A EP90120262 A EP 90120262A EP 0425972 A1 EP0425972 A1 EP 0425972A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- corrosion
- oxidation
- intermetallic compound
- weight
- temperature
- 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
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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 which complement the 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 Liche and some already introduced intermetallic compounds are known, inter alia, nickel aluminides, nickel silicides and titanium aluminides as constituents. A molybdenum silicide is also used as the heating conductor material.
- the properties of the known modified intermetallic compounds generally do not yet meet the technical requirements in order to produce usable workpieces therefrom. This applies in particular to heat resistance and high temperature corrosion resistance (resistance to sulfidation). There is therefore a need for further development and improvement of such materials.
- the invention has for its object to provide a comparatively 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 warm 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 the 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.
- the melt was poured into a cast blank of approximately 120 mm in diameter and approximately 120 mm in height.
- the blank was melted again under protective gas and also forced under solidification to solidify in the form of rods with a diameter of approximately 12 mm and a length of approximately 120 mm.
- a further improvement of the mechanical properties through a suitable heat treatment is within the realms of possibility. There is also the possibility of improvement by directional solidification, for which the alloy is particularly suitable.
- the melt was poured off analogously to embodiment 1, melted again under argon and forced to solidify in the form of a rod.
- the dimensions of the rods corresponded to embodiment 1.
- the rods were processed directly into tensile tests without subsequent heat treatment.
- the mechanical properties as a function of the test temperature thus approximately corresponded to those of Example 1. These values can be further improved by heat treatment.
- the Si contains at least 90 vol .-% of a mixture of the intermetallic phases Cr3Si and Mo3Si.
- 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.
Landscapes
- 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)
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 |
---|---|---|---|
CH3976/89 | 1989-11-03 | ||
CH3976/89A CH679312A5 (fr) | 1989-11-03 | 1989-11-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0425972A1 true EP0425972A1 (fr) | 1991-05-08 |
EP0425972B1 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) |
Families Citing this family (3)
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 |
EP0709478B1 (fr) * | 1994-10-17 | 1999-12-01 | Asea Brown Boveri Ag | Alliage à base de siliciures, contenant du chrome et du molybdène |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB842487A (en) * | 1956-12-04 | 1960-07-27 | Union Carbide Corp | Improvements in and relating to admixtures of unalloyed powder |
GB943228A (en) * | 1956-10-22 | 1963-12-04 | Commw Of Australia | Improved chromium-tungsten-silicon alloys |
-
1989
- 1989-11-03 CH CH3976/89A patent/CH679312A5/de not_active IP Right Cessation
-
1990
- 1990-10-22 EP EP90120262A patent/EP0425972B1/fr not_active Expired - Lifetime
- 1990-10-22 DE DE59005675T patent/DE59005675D1/de not_active Expired - Fee Related
- 1990-10-22 AT AT9090120262T patent/ATE105593T1/de not_active IP Right Cessation
Patent Citations (2)
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 |
Also Published As
Publication number | Publication date |
---|---|
ATE105593T1 (de) | 1994-05-15 |
EP0425972B1 (fr) | 1994-05-11 |
DE59005675D1 (de) | 1994-06-16 |
CH679312A5 (fr) | 1992-01-31 |
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