Gray iron composition and brake components formed thereof

Details Gray iron composition and brake components formed thereof Gray iron composition and brake components formed thereof

C - Chemistry, Metallurgy

22

C

C22C 37/10 (2006.01) C22C 37/06 (2006.01) F16D 65/10 (2006.01) F16D 65/12 (2006.01)

Patent

CA 2275441

Improved gray iron compositions comprise at least about 90 weight % iron, at least about 3.40 weight % carbon, from about 1 to 2.5 weight % silicon, from about 0.4 to 1.0 weight % manganese, and from about 0.02 to 0.07 weight % tin. Preferably, the gray iron compositions of the invention also include from about 0.2 to about 0.5 weight % chromium, and may further preferably include from about 0.25 to 0.75 % molybdenum and/or from about 0.3 to 1.0 % copper, and may optionally also include small amounts (less than about 1%) of such elements as titanium or vanadium, as examples. The gray iron compositions may advantageously be used in the manufacture of vehicle brake components, especially the braking surfaces of vehicle brake drums (10) or brake rotors.

Des compositions de fonte grise améliorées comprennent au moins environ 90 % en poids de fer, au moins environ 3,40 % en poids de carbone, entre environ 1 et 2,5 % en poids de silicium, entre environ 0,4 et 1,0 % en poids de manganèse et entre environ 0,02 et 0,07 % en poids d'étain. De préférence, les compositions de fonte grise comprennent également entre environ 0,2 et environ 0,5 % en poids de chrome et peuvent idéalement comprendre également entre environ 0,2 et 0,75 % de molybdène et/ou entre environ 0,3 et 1,0 % de cuivre; elles peuvent facultativement contenir également de petites quantités (moins d'1 % environ) d'éléments tels que du titane ou du vanadium par exemple. Les compositions de fonte grise de cette invention peuvent être avantageusement utilisées dans la fabrication d'éléments de frein de véhicules, plus particulièrement dans la fabrication des surfaces de freinage de tambours (10) de frein de véhicule ou de rotors de frein.

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