(19)
(11) EP 0 213 528 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.01.1988 Bulletin 1988/02

(43) Date of publication A2:
11.03.1987 Bulletin 1987/11

(21) Application number: 86111395

(22) Date of filing: 18.08.1986
(84) Designated Contracting States:
DE FR GB

(30) Priority: 02.09.1985 JP 19341585

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
 ()

(72) Inventors:
  • Kubo, Masahiro
     ()
  • Dohnomoto, Tadashi
     ()
  • Tanaka, Atsuo
     ()
  • Hirai, Hidetoshi
     ()

   


(54) Composite material including alumina-silica short fibers as reinforcing material and copper in its aluminum alloy matrix metal with the proportions thereof being related


(57) A composite material is made from alumina - silica type short fibers embedded in a matrix of metal. The percentage fiber volume proportion X% of the alumina - silica type short fibers is between approximately 5% and approximately 50%. The metal is an alloy consisting essentially of a percentage Y% of copper and remainder substantially aluminum. And the inequalities Y ≤ - 0.00092 X2 - 0.0094 X + 7.85 and Y ≥ - 0.00092 X2 - 0.0094 X + 3.55 are satisfied. The fiber volume proportion of the alumina - silica type short fibers may more desirably be between approximately 5% and approximately 40%. And the alumina - silica type short fibers may be alumina short fibers, or alternatively may be crystalline alumina - silica short fibers, of which the mullite crystalline amount may be at least about 45%. Or the alumina - silica type short fibers may be amorphous alumina - silica short fibers.






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