(19)
(11) EP 0 236 729 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.07.1989 Bulletin 1989/27

(43) Date of publication A2:
16.09.1987 Bulletin 1987/38

(21) Application number: 87101468.4

(22) Date of filing: 04.02.1987
(51) International Patent Classification (IPC)4: C22C 1/09
(84) Designated Contracting States:
DE FR GB

(30) Priority: 06.02.1986 JP 24539/86

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Aichi-ken 471 (JP)

(72) Inventors:
  • Kubo, Masahiro
    Toyota-shi Aichi-ken (JP)
  • Tanaka, Atsuo
    Toyota-shi Aichi-ken (JP)
  • Dohnomoto, Tadashi
    Toyota-shi Aichi-ken (JP)
  • Hirai, Hidetoshi c/o Toyoda Automatic Loom Works
    Kariya-shi Aichi-ken (JP)

(74) Representative: Bühling, Gerhard, Dipl.-Chem. et al
Patentanwaltsbüro Tiedtke-Bühling-Kinne & Partner Bavariaring 4
80336 München
80336 München (DE)


(56) References cited: : 
   
       


    (54) Composite material including silicon nitride whisker type short fiber reinforcing material and aluminum alloy matrix metal with moderate copper and magnesium contents


    (57) A composite material is made from silicon nitride whisker type short fiber material embedded in a matrix of metal. The matrix metal is an alloy consisting essentially of from approximately 2% to approximately 6% of copper, from approximately 0.5% to approximately 3% of magnesium, and remainder substantially aluminum. The fiber volume proportion of the silicon nitride type short fibers is between approximately 5% and approximately 50%, and may more desirably be between approximately 5% and approximately 40%. The magnesium content of the aluminum alloy matrix metal may desirably be between approximately 0.5% and approximately 2.5%. And, in the desirable case that the fiber I volume proportion of the silicon nitride whisker type short fiber material is between approximately 30% and approximately 40%, then the copper content of the aluminum alloy matrix metal is desired to be between approximately 2% and approximately 5%.






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