Classifications

• • 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
  • C22C32/001—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 with only oxides
  • C22C32/0015—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 with only oxides with only single oxides as main non-metallic constituents
  • C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof

Definitions

• the invention relates to the further development of oxide dispersion-hardened nickel-based superalloys with overall optimal properties with regard to high-temperature strength, long-term stability and resistance to oxidation and corrosion in an aggressive atmosphere.
• nickel-based alloys that contain finely divided dispersoids in the form of oxides. Most of the time, the latter are Y 2 D 3 particles.
• oxide dispersion hardened alloys of this type is the nickel-base alloy of the following composition, available from INCO under the trade name MA 6000:
• INCO has developed a new alloy to improve the anti-corrosion properties. It has the following composition:
• This alloy which has higher Cr and Al contents compared to MA 6000, has improved corrosion resistance, but tends to become unstable due to the formation of brittle phases in certain temperature ranges, which deteriorate the mechanical properties.
• the powder was comparatively coarse. Particles larger than 300 ⁇ m in diameter were retained using a sieve. The fractions below were used again.
• the alloy powder was mixed with fine Y 2 O 3 powder with a maximum particle diameter of 1 ⁇ m and a maximum crystallite diameter of 100 nm. Then the powder mixture was mechanically alloyed in the attritor for 36 hours under an argon atmosphere.
• the Attritor S-1 from Netzsch, Federal Republic of Germany had a volume of 3 liters and a filling of 12 kg steel balls. The capacity for the powder was 1 kg.
• the resistance to oxidation and corrosion was better than that of the known alloy with the trade name MA 6000.
• Samples with a smooth surface were subjected to a temperature cycle in air and the specific weight change per unit area was determined after 1000 cycles.
• One cycle lasted approximately one hour: the test specimen was heated to a temperature of 1000 ° C. and left at this temperature for 1 hour. Then, it was cooled and reheated at a rate of 500 ° C / min, and so on.
• the change in weight is a measure of the resistance to oxidation.
• the change in weight was + 0.5 mg / cm 2 surface
• the resistance to oxidation was determined by weight change as defined in Example I and was
• the resistance to oxidation was determined by weight change as defined in Example I and was
• the invention is not limited to the exemplary embodiments.
• the alloys can preferably be within the following composition limits:
• the alloys can also contain cobalt as an alloying element:
• Cobalt increases strength and improves workability.
• composition also proves to be advantageous:

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Powder Metallurgy (AREA)
• Chemically Coating (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)

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Publications (2)

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• 1987
  • 1987-08-19 EP EP87112012A patent/EP0260465B1/fr not_active Expired - Lifetime
  • 1987-08-19 DE DE8787112012T patent/DE3775671D1/de not_active Expired - Lifetime
  • 1987-08-28 US US07/090,346 patent/US4798625A/en not_active Expired - Fee Related
  • 1987-09-07 NO NO873738A patent/NO873738L/no unknown
  • 1987-09-08 JP JP62225133A patent/JP2630323B2/ja not_active Expired - Lifetime

Patent Citations (3)

Non-Patent Citations (1)

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