WO1993019216A1 - Machine component - Google Patents

Machine component Download PDF

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Publication number
WO1993019216A1
WO1993019216A1 PCT/EP1993/000504 EP9300504W WO9319216A1 WO 1993019216 A1 WO1993019216 A1 WO 1993019216A1 EP 9300504 W EP9300504 W EP 9300504W WO 9319216 A1 WO9319216 A1 WO 9319216A1
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WO
WIPO (PCT)
Prior art keywords
mass
rare earth
component according
magnesium
earth metals
Prior art date
Application number
PCT/EP1993/000504
Other languages
German (de)
French (fr)
Inventor
Günter NEITE
Eberhard Schmid
Thomas Schulze
Kohei Kubota
Ruyuji Ninomiya
Günther RUDOLPH
Original Assignee
Metallgesellschaft Aktiengesellschaft
RUDOLPH, Margarete, Martha, Eva
RUDOLPH, Ulrike, Eva
RUDOLPH, Martin, Günther
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 Metallgesellschaft Aktiengesellschaft, RUDOLPH, Margarete, Martha, Eva, RUDOLPH, Ulrike, Eva, RUDOLPH, Martin, Günther filed Critical Metallgesellschaft Aktiengesellschaft
Publication of WO1993019216A1 publication Critical patent/WO1993019216A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0085—Materials for constructing engines or their parts
    • 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
    • C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres

Definitions

  • the invention relates to a machine component cast from a magnesium alloy containing 2 to 8 mass% of rare earth metals and subject to high thermal and mechanical loads, in particular the combustion chamber of
  • Internal combustion engine component such as pistons and cylinders.
  • magnesium alloys due to their relatively low density and good mechanical properties, have been gaining increasing interest as a construction material, especially in motor vehicle construction.
  • US-A-4 401 621 is concerned with a magnesium alloy containing 1.5 to 10% by weight of yttrium and 1 to 6% by weight of neodymium, with up to 40% of the yttrium due to heavy rare earth metals and up to 40% of the neodymium are replaced by lanthanum and praseodymium.
  • EP-A-0 432 810 relates to a magnesium alloy for press-cast pistons for internal combustion engines, which contains 2 to 6% by weight of neodymium and optionally 0.5 to 7.5% by weight of yttrium.
  • BE-A-837 170 describes a magnesium alloy which contains 1.25 to 3% by weight of silver, 0.5 to 2.2% by weight of rare earth metals, thereof at least 60% neodymium, and 0.2 to 1.9 % By weight contains thorium.
  • the thorium content can be replaced in whole or in part by 2.5 to 7% by weight of yttrium.
  • the disadvantage of the magnesium alloys described above is that in particular the creep and fatigue strength of components cast therefrom, exposed to high temperatures of 250 to 350 ° C., in particular those of
  • the density is ⁇ 2.0 g / cm, the good
  • Press casting can be cast and is also suitable as a matrix alloy for fiber molded articles to be cast into components.
  • the solution to this problem is that the magnesium is alloyed with 2 to 8% by mass of samarium.
  • a rare earth metal can be used in which samarium is enriched to at least 60% by mass, while the rest can consist of one or more rare earth metals.
  • the magnesium matrix may also contain 0.2 to 3.0% by mass of one or more of the elements silver, cadmium, gallium, scandium and zinc in order to increase their strength at lower temperatures.
  • An improvement in the high-temperature properties of magnesium is achieved by adding 0.2 to 3.0% by mass of one or more of the heavy rare earth metals gadolinium, therbium, dysprosium, holmium, erbium, thulium and ytterbium.
  • the magnesium can also contain 0.01 to 1.0 mass% of one or more of the elements manganese, strontium and zirconium. Manganese and especially zirconium are used for grain aggregation. Manganese is also important to compensate for iron contamination. The main effect of strontium is to control microporosity.
  • Two magnesium-rare earth alloys according to the invention with the short designation Mg-Sm7.4 and Mg-Sm5Gdl and two alloys belonging to the prior art with the short designation Al-Sil2CuMgNi and Mg-Y5Nd2Zr were melted and with a casting temperature of 770 ° C in one Cast mold heated to 400 ° C to test specimens.
  • the test specimens were homogenized at 510 ° C. for 5 hours, then quenched with water and then tempered at 250 ° C. for 5 hours.
  • the tensile strength values of the alloy according to the invention remain comparatively constant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Forging (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

To improve the creep, fatigue and tensile strength of a machine component subject to heavy thermal and mechanical stress cast from a 2 to 8 wt.% magnesium alloy containing rare earth metals, the rare earth metal is samarium.

Description

Maschinenbauteil Machine component
Beschreibung ■ Description ■
Die Erfindung betrifft ein aus einer 2 bis 8 Masse-% Seltenerdmetalle enthaltender Magnesiumlegierung gegossenes, hohen thermischen und mechanischen Belastungen unterliegendes Maschinenbauteil, insbesondere den Brennraum vonThe invention relates to a machine component cast from a magnesium alloy containing 2 to 8 mass% of rare earth metals and subject to high thermal and mechanical loads, in particular the combustion chamber of
Verbrennungskraftmaschinen begrenzendes Bauteil, wie Kolben und Zylinder.Internal combustion engine component, such as pistons and cylinders.
Seit einigen Jahren finden Magnesiumlegierungeh bedingt durch deren relativ geringe Dichte bei gleichzeitig guten mechanischen Eigenschaften ein wachsendes Interesse als Konstruktionswerkstoff, vor allem im Kraftfahrzeugbau. Dabei wird versucht, durch Zugabe geeigneter Legierungselemente und/oder durch Anwendung besonderer Verfahrensmaßnahmen die mechanisch-technologischen Eigenschaften der Magnesiumlegierungen deutlich zu verbessern.For some years now, magnesium alloys, due to their relatively low density and good mechanical properties, have been gaining increasing interest as a construction material, especially in motor vehicle construction. An attempt is made to significantly improve the mechanical-technological properties of the magnesium alloys by adding suitable alloying elements and / or by using special process measures.
Bereits 1946 wurde vorgeschlagen, die Festigkeit von Magnesium durch die Zugabe von Cer und Thorium zu verbessern, um daraus Kolben für Verbrennungskraftmaschinen durch Schmieden mit entsprechendem Faserverlauf herstellen zu können (Firmenschrift: Mahle KG und Elektron-Co. mbH, Stuttgart-Bad Cannstatt, 1946). Aus der US-A-3 419 385 ist eine mit Yttrium legierte Magnesiumlegierung bekannt, die gemäß JP-A-57 210 946 noch Neodymium enthalten kann. In der JP-A-86 250 144 ist eine gegossene Magnesiumlegierung vorgesehen, die 2 bis 8 Gew.% Yttrium und 2 bis 7 Gew.% Samarium enthält und die eine gute Festigkeit bis 300°C sowie eine gute Kriechfestigkeit bei hohen Temperaturen aufweisen soll und deshalb für die Herstellung von hohen Temperaturen' ausgesetzten Bauteilen von Maschinen geeignet sein soll. Die US-A-4 401 621 befaßt sich mit einer 1,5 bis 10 Gew.% Yttrium und 1 bis 6 Gew.% Neodymium enthaltenden Magnesiumlegierung, wobei bis zu 40 % des Yttriums durch schwere Seltenerdmetalle und bis zu 40 % des Neody iums durch Lanthan, und Praseodymium ersetzt sind. Gegenstand der EP-A-0 432 810 ist eine Magnesiumlegierung für preßgegossene Kolben für Verbrennungskraftmaschinen, die 2 bis 6 Gew.% Neodymium und ggf. 0,5 bis 7,5 Gew.% Yttrium enthält. In der BE-A-837 170 ist eine Magnesiumlegierung beschrieben, die 1,25 bis 3 Gew.% Silber, 0,5 bis 2,2 Gew.% Seltenerdmetalle, davon mindestens 60 % Neodymium, und 0,2 bis 1,9 Gew.% Thorium enthält. Gemäß der DE-C-2 558 915 kann der Thoriumgehalt ganz oder teilweise durch 2,5 bis 7 Gew.% Yttrium ersetzt sein. Der Nachteil der vorstehend beschriebenen Magnesiumlegierungen besteht darin, daß insbesondere die Kriech- und Ermüdungsfestigkeit daraus gegossener, hohen Temperaturen von 250 bis 350°C ausgesetzter Bauteile, insbesondere solche vonAs early as 1946, it was proposed to improve the strength of magnesium by adding cerium and thorium in order to be able to use it to produce pistons for internal combustion engines by forging with the appropriate fiber orientation (company publication: Mahle KG and Elektron-Co. MbH, Stuttgart-Bad Cannstatt, 1946 ). From US-A-3 419 385 a magnesium alloy alloyed with yttrium is known, which according to JP-A-57 210 946 can also contain neodymium. JP-A-86 250 144 provides a cast magnesium alloy which contains 2 to 8% by weight of yttrium and 2 to 7% by weight of samarium and which is said to have good strength up to 300 ° C. and good creep resistance at high temperatures and therefore should be suitable for the production of components exposed to high temperatures of machines. US-A-4 401 621 is concerned with a magnesium alloy containing 1.5 to 10% by weight of yttrium and 1 to 6% by weight of neodymium, with up to 40% of the yttrium due to heavy rare earth metals and up to 40% of the neodymium are replaced by lanthanum and praseodymium. EP-A-0 432 810 relates to a magnesium alloy for press-cast pistons for internal combustion engines, which contains 2 to 6% by weight of neodymium and optionally 0.5 to 7.5% by weight of yttrium. BE-A-837 170 describes a magnesium alloy which contains 1.25 to 3% by weight of silver, 0.5 to 2.2% by weight of rare earth metals, thereof at least 60% neodymium, and 0.2 to 1.9 % By weight contains thorium. According to DE-C-2 558 915, the thorium content can be replaced in whole or in part by 2.5 to 7% by weight of yttrium. The disadvantage of the magnesium alloys described above is that in particular the creep and fatigue strength of components cast therefrom, exposed to high temperatures of 250 to 350 ° C., in particular those of
Verbrennungskraftmaschinen, unbefriedigend ist. Selbst die vergleichsweise günstigen Zeitstandfestigkeiten von Magnesiumlegierungen mit Zusätzen von Yttrium und Mischmetall sind für den Einsatz für Bauteile von Verbrennungskraftmaschinen nicht geeignet, da Yttrium festigkeitsbegrenzend wirkt und außerdem ein vergleichsweise teures Element ist. Mit Thorium legiertes Magnesium besitzt zwar höchste Festigkeiten bei hohen Temperaturen; sein Einsatz kann jedoch wegen der geringen Radioaktivität des Thoriums für die Zukunft außer Betracht bleiben. Aufgabe der vorliegenden Erfindung ist es deshalb, eineInternal combustion engines, is unsatisfactory. Even the comparatively low creep rupture strength of magnesium alloys with the addition of yttrium and mixed metal are not suitable for use in components of internal combustion engines, since yttrium has a strength-limiting effect and is also a comparatively expensive element. Magnesium alloyed with thorium has the highest strength at high temperatures; however, its use may not be considered in the future due to the low radioactivity of the thorium. The object of the present invention is therefore a
Seltenerdmetalle enthaltende MagnesiumlegierungMagnesium alloy containing rare earth metals
3 bereitzustellen, deren Dichte < 2,0 g/cm ist, die gute3 to provide, the density is <2.0 g / cm, the good
Kriech- und Ermüdungsfestigkeiten sowie Zugfestigkeiten bei hohen Temperaturen aufweist, sich gut auch durchCreep and fatigue strengths as well as tensile strengths at high temperatures, well through
Preßgießen gießen läßt und auch als Matrixlegierung für in Bauteile einzugießende Faserformkörper in Betracht kommt.Press casting can be cast and is also suitable as a matrix alloy for fiber molded articles to be cast into components.
Die Lösung dieser Aufgabe besteht darin, daß das Magnesium mit 2 bis 8 Masse-% Samarium legiert ist.The solution to this problem is that the magnesium is alloyed with 2 to 8% by mass of samarium.
Nach einem weiteren Erfindungsmerkmal kann ein Seltenerdmetall verwendet werden, in dem Samarium zu wenigstens 60 Masse-% angereichert ist, während der Rest aus einem oder mehreren Seltenerdmetallen bestehen kann.According to a further feature of the invention, a rare earth metal can be used in which samarium is enriched to at least 60% by mass, while the rest can consist of one or more rare earth metals.
Durch den Zusatz von 0,05 bis 1,0 Masse-% Aluminium und/oder Silizium wird das Kriech- und Ermüdungsverhalten der Samarium enthaltenden Magnesiumlegierung bei hohen Temperaturen durch die Ausbildung fein verteilter Aluminide bzw. Suizide verbessert.The addition of 0.05 to 1.0% by mass of aluminum and / or silicon improves the creep and fatigue behavior of the magnesium alloy containing samarium at high temperatures by the formation of finely divided aluminides or suicides.
Es können auch noch 0,2 bis 3,0 Masse-% eines oder mehrerer der Elemente Silber, Cadmium, Gallium, Scandium und Zink in der Magnesiummatrix enthalten sein, um deren Festigkeit bei niedrigeren Temperaturen __- zu steigern.The magnesium matrix may also contain 0.2 to 3.0% by mass of one or more of the elements silver, cadmium, gallium, scandium and zinc in order to increase their strength at lower temperatures.
Eine Verbesserung der Hochtemperatureigenschaften des Magnesiums wird durch den Zusatz von 0,2 bis 3,0 Masse-% eines oder mehrerer der schweren Seltenerdmetalle Gadolinium, Therbium, Dysprosium, Holmium, Erbium, Thulium und Ytterbium erzielt. Darüber hinaus kann das Magnesium noch 0,01 bis 1,0 Masse-% eines oder mehrerer der Elemente Mangan, Strontium und Zirkonium enthalten. Mangan und insbesondere Zirkonium dienen zur Korn einung. Mangan ist außerdem wichtig zur Kompensation von Eisenverunreinigungen. Die Hauptwirkung des Strontiums liegt in der Beherrschung der Mikroporosität.An improvement in the high-temperature properties of magnesium is achieved by adding 0.2 to 3.0% by mass of one or more of the heavy rare earth metals gadolinium, therbium, dysprosium, holmium, erbium, thulium and ytterbium. In addition, the magnesium can also contain 0.01 to 1.0 mass% of one or more of the elements manganese, strontium and zirconium. Manganese and especially zirconium are used for grain aggregation. Manganese is also important to compensate for iron contamination. The main effect of strontium is to control microporosity.
Durch den Zusatz von 0,2 bis 3,0 Masse-% Lithium wird die Dichte der Magnesiumlegierung weiter gesenkt.The addition of 0.2 to 3.0% by mass of lithium further reduces the density of the magnesium alloy.
Die Erfindung ist im folgenden durch Ausführungsbeispiele näher erläutert.The invention is explained in more detail below by means of exemplary embodiments.
Es wurden zwei erfindungsgemäße Magnesium-Seltenerdmetalle-Legierungen mit der Kurzbezeichnung Mg-Sm7,4 und Mg-Sm5Gdl und zwei zum Stand der Technik zählende Legierungen mit der Kurzbezeichnung Al-Sil2CuMgNi und Mg-Y5Nd2Zr erschmolzen und mit einer Gießtemperatur von 770°C in eine auf 400°C erwärmte Gießform zu Probekörpern gegossen. Die Probekörper wurden 5 h lang bei 510°C homogenisiert, dann mit Wasser abgeschreckt und anschließend 5 h lang bei 250°C vergütet.Two magnesium-rare earth alloys according to the invention with the short designation Mg-Sm7.4 and Mg-Sm5Gdl and two alloys belonging to the prior art with the short designation Al-Sil2CuMgNi and Mg-Y5Nd2Zr were melted and with a casting temperature of 770 ° C in one Cast mold heated to 400 ° C to test specimens. The test specimens were homogenized at 510 ° C. for 5 hours, then quenched with water and then tempered at 250 ° C. for 5 hours.
Die an den Probekörpern in Abhängigkeit von der Temperatur durchgeführten Zugfestigkeitsmessungen zeigen, daß die Zugfestigkeitswerte der beiden zum Stand der Technik gehörenden Legierungen mit steigender __- Temperatur stark gegen Null abfallen, während dieThe tensile strength measurements carried out on the test specimens as a function of the temperature show that the tensile strength values of the two alloys belonging to the prior art drop sharply towards zero with increasing __ temperature, while the
Zugfestigkeitswerte der erfindungsgemäßen Legierung vergleichsweise konstant bleiben. The tensile strength values of the alloy according to the invention remain comparatively constant.

Claims

Patentansprüche Claims
1. Aus einer 2 bis 8 Masse-% Seltenerdmetalle enthaltender Magnesiumlegierung gegossenes, hohen thermischen und mechanischen Belastungen unterliegendes Maschinenbauteil, insbesondere den Brennraum von Verbrennungskraftmaschinen begrenzendes Bauteil, wie Kolben und Zylinder, dadurch gekennzeichnet, daß das Seltenerdmetall aus Samarium besteht.1. Made of a magnesium alloy containing 2 to 8% by mass of rare earth metals, subject to high thermal and mechanical loads, the machine component, in particular the combustion chamber of internal combustion engine components such as pistons and cylinders, characterized in that the rare earth metal consists of samarium.
2. Bauteil nach Anspruch 1, dadurch gekennzeichnet, daß das Seltenerdmetall aus zu wenigstens 60 Masse-% angereichertem Samarium und einem Rest aus einem oder mehreren Seltenerdmetallen besteht.2. Component according to claim 1, characterized in that the rare earth metal consists of at least 60 mass% enriched samarium and a remainder of one or more rare earth metals.
3. Bauteil nach einem der Ansprüche 1 und 2-, dadurch gekennzeichnet, daß die Magnesiummatrix 0,05 bis 1,0 Masse-% Aluminium-und/oder Silizium enthält.3. Component according to one of claims 1 and 2-, characterized in that the magnesium matrix contains 0.05 to 1.0 mass% aluminum and / or silicon.
4. Bauteil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Magnesiummatrix 0,2 bis4. Component according to one of claims 1 to 3, characterized in that the magnesium matrix 0.2 to
3,0 Masse-% eines oder mehrerer der Elemente Silber, Cadmium, Gallium, Scandium und Zink enthält.3.0% by mass of one or more of the elements containing silver, cadmium, gallium, scandium and zinc.
5. Bauteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Magnesiummatrix 0,2 bis 3,0 Masse-% eines oder mehrerer der schweren Seltenerdmetalle Gadolinium, Therbium, Dysprosium, Holmium, Erbium, Thulium und Ytterbium enthält. 5. Component according to one of claims 1 to 4, characterized in that the magnesium matrix contains 0.2 to 3.0% by mass of one or more of the heavy rare earth metals gadolinium, therbium, dysprosium, holmium, erbium, thulium and ytterbium.
6. Bauteil nach einem der Ansprüche 1 bis 5, dadurch- gekennzeichnet, daß die Magnesiummatrix 0,01 bis 1,0 Masse-% eines oder mehrerer der Elemente Mangan, Strontium und Zirkonium enthält.6. Component according to one of claims 1 to 5, characterized in that the magnesium matrix contains 0.01 to 1.0 mass% of one or more of the elements manganese, strontium and zirconium.
7. Bauteil nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Magnesiummatrix 0,2 bis 3,0 Masse-% Lithium enthält. 7. Component according to one of claims 1 to 6, characterized in that the magnesium matrix contains 0.2 to 3.0% by mass of lithium.
PCT/EP1993/000504 1992-03-17 1993-03-05 Machine component WO1993019216A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924208504 DE4208504A1 (en) 1992-03-17 1992-03-17 MACHINE COMPONENT
DEP4208504.7 1992-03-17

Publications (1)

Publication Number Publication Date
WO1993019216A1 true WO1993019216A1 (en) 1993-09-30

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MX (1) MX9301411A (en)
WO (1) WO1993019216A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024701A1 (en) * 1995-02-06 1996-08-15 British Aluminium Holdings Limited Magnesium alloys

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19915277A1 (en) * 1999-04-03 2000-10-05 Volkswagen Ag Magnesium alloy used e.g. in the manufacture of a wheel rim contains traces of cadmium, copper, iron, nickel and lanthanum and yttrium
WO2003016581A1 (en) * 2001-08-13 2003-02-27 Honda Giken Kogyo Kabushiki Kaisha Magnesium alloy
DE102009038449B4 (en) 2009-08-21 2017-01-05 Techmag Ag magnesium alloy
US8435444B2 (en) 2009-08-26 2013-05-07 Techmag Ag Magnesium alloy
DE102011112561A1 (en) 2011-09-08 2013-03-14 Techmag Ag A process for producing a magnesium alloy and a magnesium alloy produced thereafter
DE102013006169A1 (en) 2013-04-10 2014-10-16 Ulrich Bruhnke Aluminum-free magnesium alloy
DE102013006170A1 (en) 2013-04-10 2014-10-16 Ulrich Bruhnke Aluminum-free magnesium alloy

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258178A1 (en) * 1986-07-30 1988-03-02 Claude Planchamp Nuclear radiation absorbers
EP0407964A2 (en) * 1989-07-13 1991-01-16 Ykk Corporation High strength magnesium-based alloys
EP0432810A1 (en) * 1989-11-11 1991-06-19 KOLBENSCHMIDT Aktiengesellschaft Pressure cast light metal piston for internal combustion engines
EP0499321A1 (en) * 1991-02-15 1992-08-19 KOLBENSCHMIDT Aktiengesellschaft Lightweight metal piston for internal combustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0258178A1 (en) * 1986-07-30 1988-03-02 Claude Planchamp Nuclear radiation absorbers
EP0407964A2 (en) * 1989-07-13 1991-01-16 Ykk Corporation High strength magnesium-based alloys
EP0432810A1 (en) * 1989-11-11 1991-06-19 KOLBENSCHMIDT Aktiengesellschaft Pressure cast light metal piston for internal combustion engines
EP0499321A1 (en) * 1991-02-15 1992-08-19 KOLBENSCHMIDT Aktiengesellschaft Lightweight metal piston for internal combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996024701A1 (en) * 1995-02-06 1996-08-15 British Aluminium Holdings Limited Magnesium alloys
AU691082B2 (en) * 1995-02-06 1998-05-07 Luxfer Group Limited Magnesium alloys

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DE4208504A1 (en) 1993-09-23
MX9301411A (en) 1994-08-31

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