Hard coating for glass molding and glass molding die having the hard coating
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorsHirotaka Ito, Kenji Yamamoto
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Abstract
A hard coating combining excellent mold releasability with respect to glass with excellent durability at high temperature environment of 600° C. or more, and a glass molding die having the hard coating are provided. A glass molding die has a hard coating formed on a molding surface of a base. The hard coating includes one or two of W and V, and B, C and N; wherein when a composition of the coating is expressed as Wa1Va2BbCcNd, 0.1≦a1+a2≦0.5, 0.05≦b≦0.5, 0.02≦c≦0.15, 0.05≦d≦0.5, and a1+a2+b+c+d=1 are given. The hard coating can be formed on the molding surface of the base via an intermediate layer including an amorphous CrSiN film.
Claims6
A hard coating for glass molding, which is formed on a molding surface of a base of a glass molding die, comprising:
- one or two of W and V, and B, C and N;
- wherein when a composition of the coating is expressed as Wa1Va2BbCcNd,
- 0.1≦a1+a2≦0.5, 0.05≦b≦0.5,
- 0.02≦c≦0.15, 0.05≦d≦0.5, and
- a1+a2+b+c+d=1 are given.
Dependencies are inferred from the claim text.