HARD COATING FILM
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United States of America Patent
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Dec 14, 2015
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Feb 5, 2015
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A hard film formed on/above a substrate has a composition represented by the following formula (1): Cr1−aMga(BxCyN1−x−y) (1). In the formula (1), a is the atomic ratio of Mg, x is the atomic ratio of B, and y is the atomic ratio of C; and a, x, and y satisfy the following relationships: 0.05≦a≦0.30, 0≦x≦0.20, and 0≦y≦0.30.
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