EP0478025A1 - Bauteile für Motoren und Fahrzeuge - Google Patents

Bauteile für Motoren und Fahrzeuge Download PDF

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Publication number
EP0478025A1
EP0478025A1 EP91202112A EP91202112A EP0478025A1 EP 0478025 A1 EP0478025 A1 EP 0478025A1 EP 91202112 A EP91202112 A EP 91202112A EP 91202112 A EP91202112 A EP 91202112A EP 0478025 A1 EP0478025 A1 EP 0478025A1
Authority
EP
European Patent Office
Prior art keywords
mass
magnesium
components according
addition
embedded
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.)
Withdrawn
Application number
EP91202112A
Other languages
German (de)
English (en)
French (fr)
Inventor
Eberhard E. Dr. Schmid
Günter Dr. Neite
Siegfried Dr. Mielke
Wolfgang Dr. Henning
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.)
Kolbenschmidt AG
Original Assignee
Kolbenschmidt AG
Metallgesellschaft 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 Kolbenschmidt AG, Metallgesellschaft AG filed Critical Kolbenschmidt AG
Publication of EP0478025A1 publication Critical patent/EP0478025A1/de
Withdrawn legal-status Critical Current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
    • C22C23/00—Alloys based on magnesium
    • 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 components for engines and vehicles, in particular pistons, cylinders, cylinder heads, cylinder blocks and gear housings for internal combustion engines or compressors, which are made of magnesium or magnesium alloy by low pressure, pressure or pressure casting.
  • the reduction in the compression height of the piston and a reduction in the piston skirt's comparatively low density of magnesium or magnesium alloys always provided an incentive to test the pistons made from them in internal combustion engines to reduce the oscillating masses of the internal combustion engine and to lower the bearing pressures due to the relatively lighter piston.
  • Magnesium materials have very considerable disadvantages compared to the aluminum-silicon alloys usually used for the production of light metal pistons for internal combustion engines.
  • the lifespan of pistons made of magnesium materials is relatively short and their strength is relatively low compared to the dynamic stress caused by the gas forces.
  • DE-20 46 862 A describes the running surface of the piston made of magnesium material with a wear-resistant metallic running layer, e.g. Chrome, which should adhere to the piston body via an intermediate layer of aluminum.
  • a wear-resistant metallic running layer e.g. Chrome
  • the solution to this problem consists in a component consisting of the material mentioned at the beginning, in whose heat-resistant ductile matrix, hard fine-lamellar eutectic and solid, primarily excreted magnesium silicide is embedded. Compared to a component cast from a conventional aluminum-silicon alloy, such a component has a comparatively lower mass with sufficient heat resistance and wear resistance as well as lower friction.
  • magnesium silicide or silicon added to the magnesium or magnesium alloy melt leads to an excretion of finely lamellar, eutectic and solid primarily excreted magnesium silicide during solidification, which has good strength properties, in particular high fatigue strength, at high component temperatures.
  • magnesium silicide or 0.1 to 2.5% by mass of silicon to the magnesium or magnesium alloy melt creates structures which, in the manner of a network of magnesium silicide of the eutectic, have excellent strength (Cohesion) of the component at elevated temperatures and contain mainly magnesium silicide phase in fine lamellar eutectic form in addition to magnesium.
  • magnesium silicide By adding more than 3.6% by mass of magnesium silicide or more than 1.3% by mass of silicon to the magnesium or magnesium alloy melt, a bimodal structure is formed which consists of solid primarily excreted magnesium silicide and magnesium / magnesium silicide eutectic and makes a significant contribution to improving the heat resistance.
  • the component matrix contains> 1 to 50% by mass, preferably 3 to 50% by mass, magnesium silicide.
  • the components cast from magnesium or magnesium alloys all contain magnesium silicide in eutectic and primary form, preferably in the concentration range from> 0.3 to 18% by mass of silicon.
  • the preferred magnesium alloys consist of 6 to 9% aluminum, 0.13% manganese, 0.68 to 0.7% zinc, balance magnesium and 3.5% rare earth, 5.25% yttrium, 0.5 % Zirconium, balance magnesium.
  • the component matrix contains up to 12% by mass of aluminum and / or zinc, which increase the piston strength through precipitations.
  • An increase in strength, in particular heat resistance, results from the addition of up to 16% by mass of silver.
  • the component matrix can still contain up to 1% by mass of zirconium and / or titanium, which additionally produce a grain-refining effect.
  • the creep resistance is improved by adding up to 7% by mass of one or more rare earth metals.
  • the density of the magnesium material is reduced especially by the addition of up to 7% by mass of lithium.
  • the hardening of the cast component can be accelerated by adding up to 1% by mass of one or more of the metals manganese, copper, cobalt, nickel and chromium.
  • Ceramic fibers preferably consisting of aluminum oxide, silicon carbide, carbon, aluminum nitride or silicon nitride, can be embedded in the component matrix, fiber shaped bodies being expediently arranged.
  • Fig. 1 shows a section through a piston crown (1) with combustion chamber trough (2), ring section (3) and shaft section (4) with piston pin bores (5) consisting of magnesium cast pistons for internal combustion engines along the plane comprising the piston axis and the piston pin axis .
  • microstructure section (X) shown in the photograph according to FIG. 2 in 200 times magnification by light microscope approx. 50 vol is surrounded by fine lamellar eutectic magnesium silicide.
  • the material has the properties listed in the table below. In comparison, the same properties are given for a common aluminum piston alloy of the type AISi12CuNiMg.
  • the advantages achieved by the invention are to be seen in particular in that the density is reduced by at least 30% compared to the aluminum-silicon alloys usually used for the manufacture of pistons, but a similar, sufficiently high heat resistance is retained.

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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)
EP91202112A 1990-09-22 1991-08-19 Bauteile für Motoren und Fahrzeuge Withdrawn EP0478025A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4030094 1990-09-22
DE4030094 1990-09-22
DE4125014 1991-07-27
DE4125014A DE4125014A1 (de) 1990-09-22 1991-07-27 Bauteile fuer motoren und fahrzeuge

Publications (1)

Publication Number Publication Date
EP0478025A1 true EP0478025A1 (de) 1992-04-01

Family

ID=25897109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91202112A Withdrawn EP0478025A1 (de) 1990-09-22 1991-08-19 Bauteile für Motoren und Fahrzeuge

Country Status (5)

Country Link
EP (1) EP0478025A1 (pt)
JP (1) JPH04263037A (pt)
BR (1) BR9104044A (pt)
DE (1) DE4125014A1 (pt)
NO (1) NO913293L (pt)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172554A2 (en) * 2000-07-14 2002-01-16 Kabushiki Kaisha Toyota Jidoshokki Swash plate compressor piston shoes
WO2005046911A1 (de) * 2003-11-07 2005-05-26 Mahle Gmbh Verfahren zur herstellung von metall-matrix-verbundwerkstoffen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2582027B2 (ja) * 1993-03-26 1997-02-19 三井金属鉱業株式会社 マグネシウム合金鋳物の製造方法
CN105492748A (zh) * 2013-08-30 2016-04-13 日立工机株式会社 发动机以及具备该发动机的发动机作业机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE392022C (de) * 1922-12-29 1924-03-15 Griesheim Elektron Chem Fab Magnesiumlegierungen
FR568584A (fr) * 1922-09-19 1924-03-28 Griesheim Elektron Chem Fab Piston pour moteur à combustion interne
DE397346C (de) * 1922-11-18 1924-06-20 Griesheim Elektron Chem Fab Verfahren zur Herstellung von Magnesium-Silizium-Legierungen
US3162552A (en) * 1961-06-02 1964-12-22 Dow Chemical Co Magnesium-base extrusion alloy
GB1034227A (en) * 1964-06-04 1966-06-29 Magnesium Elektron Ltd Improvements in or relating to magnesium base alloys
DE1433108A1 (de) * 1961-06-02 1968-10-17 Knapsack Ag Siliciumhaltige,korrosionsbestaendige Magnesiumlegierungen mit feinkoernigem Erstarrungsgefuege und Verfahren zu ihrer Herstellung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR568584A (fr) * 1922-09-19 1924-03-28 Griesheim Elektron Chem Fab Piston pour moteur à combustion interne
DE397346C (de) * 1922-11-18 1924-06-20 Griesheim Elektron Chem Fab Verfahren zur Herstellung von Magnesium-Silizium-Legierungen
DE392022C (de) * 1922-12-29 1924-03-15 Griesheim Elektron Chem Fab Magnesiumlegierungen
US3162552A (en) * 1961-06-02 1964-12-22 Dow Chemical Co Magnesium-base extrusion alloy
DE1433108A1 (de) * 1961-06-02 1968-10-17 Knapsack Ag Siliciumhaltige,korrosionsbestaendige Magnesiumlegierungen mit feinkoernigem Erstarrungsgefuege und Verfahren zu ihrer Herstellung
GB1034227A (en) * 1964-06-04 1966-06-29 Magnesium Elektron Ltd Improvements in or relating to magnesium base alloys

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172554A2 (en) * 2000-07-14 2002-01-16 Kabushiki Kaisha Toyota Jidoshokki Swash plate compressor piston shoes
EP1172554A3 (en) * 2000-07-14 2004-04-28 Kabushiki Kaisha Toyota Jidoshokki Swash plate compressor piston shoes
WO2005046911A1 (de) * 2003-11-07 2005-05-26 Mahle Gmbh Verfahren zur herstellung von metall-matrix-verbundwerkstoffen
CN100402191C (zh) * 2003-11-07 2008-07-16 马勒有限公司 制备金属基体复合材料的方法
US8282748B2 (en) 2003-11-07 2012-10-09 Mahle Gmbh Process for producing metal matrix composite materials

Also Published As

Publication number Publication date
JPH04263037A (ja) 1992-09-18
BR9104044A (pt) 1992-06-02
NO913293D0 (no) 1991-08-22
NO913293L (no) 1992-03-23
DE4125014A1 (de) 1992-03-26

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