Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C18/00—Alloys based on zinc
  • C22C18/04—Alloys based on zinc with aluminium as the next major constituent

Definitions

• the present invention relates to a zinc-based alloy containing Al and Cu, which can be cast under pressure in a hot chamber machine.
• ACuZinc 5" consists of 5.0-6.0% Cu, 2.8-3.3% Al and 0.025- 0.05% Mg, Zn residue (all the percentages given in the present application are% by weight).
• the creep resistance of this alloy although appreciably higher than that of ZamaJc or ZA alloys cast for a long time in a hot chamber, is still relatively low.
• the object of the present invention is to provide an alloy as defined above, which has better creep resistance than the known alloy mentioned above.
• the alloy contains, in% by weight: either 15-20 Al, 8-10 Cu, 0.01-2 Si, 0-0.1 Mg, 0-0.5 Ti , 0-0.5 Cr,
• composition 0-1 Mn, 0-0.5 Nb and 0-0.1 of a metal or a mixture of rare earth metals, this composition being called hereinafter variant I, i.e. 25-30 Al, 15- 20 Cu, 0.01-2 Si, 0-0.1 Mg, 0-0.5 Ti, 0-0.5 Cr,
• the two variants have, in the liquid state, at temperatures not exceeding 460 ° C., such low aggressiveness with respect to the steels that they are pourable in the chamber hot and on the other hand that variant I has in the cast state a good creep resistance and an excellent tensile strength, while variant II has in the cast state an excellent creep resistance and a good resistance to traction.
• the contents of Al and Cu, mentioned above, must be respected; otherwise, the melting point of the alloy rises above 450 ° C, which means that the alloy is no longer pourable in a hot room, because its aggressiveness towards the casting equipment becomes too great above 460 ° C.
• the silicon content is less than 0.01%, the tensile strength and creep resistance deteriorate.
• a silicon content of more than 2% makes the alloy, in the molten state, too pasty and too aggressive.
• alloys (a) and ( c) are the closest to the alloy according to the invention.
• the alloy (a) has too low a Cu content and a too high Mg content for it to be poured in a hot chamber.
• Alloy (c) also has too low a Cu content; moreover, it is extremely difficult to prepare an alloy containing 0.25-2% of rare earth metals, even in the oxidized state, because of the great affinity of these metals for oxygen.
• Variant I advantageously contains 15-18% and preferably 15-17% Al.
• the preferred Al and Cu contents of variant II are 25.5-28.5% and 15-18% respectively.
• the preferential Si content of the two variants is 0.1-1%.
• Both variants can contain - up to 0.1% Mg to improve, if necessary, the resistance to intercrystalline corrosion, *
• Zn, Al and Cu, used to make the alloy have a purity of> 99.99%, ⁇ 99.95% and ⁇ 99.99% respectively, because it has been found that the the presence of impurities in the alloy adversely influences its fluidity and its mechanical properties.
• zinc with a purity of> 99.995% and aluminum with a purity of> 99.97% are used.
• the alloy contains a metal having a very high affinity for oxygen, such as for example Y, at least a part of this metal can be present in the oxidized state.
• Test pieces of these alloys were poured into a hot chamber machine.
• test pieces are those prescribed by the Technical Committee of European Zinc Producers for test pieces to be used in the tensile test of sheets and sheets of zinc and zinc alloys.
• the test pieces were subjected to the creep test at 100 ° C. under a load of 40 MPa.
• the creep curves, giving the elongation (in%) measured as a function of time (in hours), are shown in the attached diagram.
• alloys according to the invention resist creep much better than the known alloys.
• the tensile tests were carried out at room temperature with a tensile speed of 1 cm / min on test pieces with a thickness of 3 mm, manufactured as described above.
• the present invention also relates to a process for manufacturing articles of a zinc-based alloy containing Al and Cu by die-casting in a hot chamber machine, this process being characterized in that the alloy is the alloy of the invention and in that the casting is carried out at a temperature equal to or less than 460 ° C.
• the alloy of the invention is pourable in a hot room, it is necessarily pourable in a cold room and by gravity.
• the present invention therefore also relates to a process for manufacturing articles of a zinc-based alloy containing Al and Cu by pressure casting in a cold chamber machine or by gravity casting, this process being characterized in that the alloy is the alloy of the invention.
• the present invention also relates to the use of the alloy according to the invention as an anti-friction material.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)
• Continuous Casting (AREA)
• Forging (AREA)
• Ceramic Products (AREA)
• Molds, Cores, And Manufacturing Methods Thereof (AREA)
• Supercharger (AREA)
• Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
• Ink Jet (AREA)
• Conductive Materials (AREA)
• Mold Materials And Core Materials (AREA)
• Sliding-Contact Bearings (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Adornments (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Priority Applications (11)

Applications Claiming Priority (2)

Publications (1)

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Citations (3)

• 1994
  • 1994-07-18 BE BE9400676A patent/BE1008479A3/fr not_active IP Right Cessation
• 1995
  • 1995-07-12 JP JP50471196A patent/JP3800345B2/ja not_active Expired - Fee Related
  • 1995-07-12 CA CA002185013A patent/CA2185013C/en not_active Expired - Fee Related
  • 1995-07-12 WO PCT/EP1995/002820 patent/WO1996002682A1/fr active IP Right Grant
  • 1995-07-12 EP EP95926933A patent/EP0771365B1/de not_active Expired - Lifetime
  • 1995-07-12 AT AT95926933T patent/ATE173029T1/de not_active IP Right Cessation
  • 1995-07-12 CZ CZ199751A patent/CZ287825B6/cs not_active IP Right Cessation
  • 1995-07-12 DE DE69505820T patent/DE69505820T2/de not_active Expired - Fee Related
  • 1995-07-12 KR KR1019960705161A patent/KR100343309B1/ko not_active IP Right Cessation
  • 1995-07-12 BR BR9507577A patent/BR9507577A/pt not_active IP Right Cessation
  • 1995-07-12 DK DK95926933T patent/DK0771365T3/da active
  • 1995-07-12 ES ES95926933T patent/ES2126301T3/es not_active Expired - Lifetime
  • 1995-07-12 AU AU31139/95A patent/AU3113995A/en not_active Abandoned
  • 1995-07-12 PL PL95318133A patent/PL178557B1/pl not_active IP Right Cessation
  • 1995-07-13 PE PE1995273756A patent/PE12696A1/es not_active Application Discontinuation
• 1997
  • 1997-01-16 FI FI970177A patent/FI114400B/fi active IP Right Grant

Patent Citations (3)

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