| 摘要 |
PURPOSE: A brake disk is provided to have the heat resistance against high temperature, abrasion resistance, and shock resistance by adding cobalt and by applying graphite having coefficient of form of 0.20~0.525. CONSTITUTION: A brake disk is made of carbon(C) of 3.6 ~ 4.2 weight%, silicon(Si) of 2.0 ~ 3.0 weight%, manganese(Mn) of 1.0 weight% or less, phosphorus(P) of 0.05 weight% or less, sulfur(S) of 0.03 weight% or less, nickel(Ni) of 1.0 ~ 2.0 weight%, chrome(Cr) of 0.2 ~ 0.5 weight%, iron(Fe) including the impurities, and cobalt(Co) of 0.5 ~ 3.0 weight%. The coefficient of form of graphite is 0.20~0.525.
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