Molding core
A molding core includes: a substrate having a roughened article-shaping surface; and a hard coating formed on the roughened article-shaping surface of the substrate and including a protective film that comprises a metal complex of carbon and at least one noble metal selected from the group consisting of Pt, Ir, Ru, Re, Rh, Ta, and Os. The protective film has a thickness greater than 5 μm so as to increase the number of times that the protective film can be repaired. Combination of the noble metal and carbon can prevent the noble metal of the protective film from reacting with carbon of a diamond tool during turning process.
1 . A molding core for a press-molding mold, comprising:
a substrate having a roughened article-shaping surface; and
a hard coating formed on said roughened article-shaping surface of said substrate and including a protective film that comprises a metal complex of carbon and at least one first noble metal selected from the group consisting of Pt, Ir, Ru, Re, Rh, Ta, and Os;
wherein said protective film has a thickness greater than 5 μm.
2 . The molding core of claim 1 , wherein said metal complex contains 10 to 50 wt % carbon.
3 . The molding core of claim 2 , wherein said metal complex comprises Ru and Ta.
4 . The molding core of claim 3 , wherein said metal complex further comprises at least one second noble metal that is selected from the group consisting of Pd and Au.
5 . The molding core of claim 4 , wherein said second metal complex is Pd.
6 . The molding core of claim 2 , wherein said metal complex comprises Ru and Ir.
7 . The molding core of claim 2 , wherein said metal complex comprises Ir and Re.
8 . The molding core of claim 1 , wherein the thickness of said protective film ranges from 10 to 30 μm.
9 . The molding core of claim 1 , wherein said hard coating further includes an intermediate layer that is sandwiched between said substrate and said protective film, said intermediate layer comprising a metal compound selected from the group consisting of a metal oxide, a metal nitride, and a metal carbide, said metal compound comprising at least one metal selected from the group consisting of Ti, Cr, Nb, Zr, Al, and Si.
10 . The molding core of claim 9 , wherein said metal compound is titanium nitride.
11 . The molding core of claim 9 , wherein said intermediate layer has a thickness ranging from 20 to 200 nm.
12 . The molding core of claim 1 , wherein said substrate is made from tungsten carbide.
13 . A molding core for a press-molding mold, comprising:
a substrate; and
a hard coating formed on said substrate and including a protective film that comprises a metal complex of carbon, at least one first noble metal, and at least one second noble metal;
wherein at least one of the electrons in the outermost D orbit of the atom of said first noble metal is unpaired, and all of the electrons in the outermost D orbit of the atom of said second noble metal are paired.
14 . The molding core of claim 13 , wherein said metal complex contains 10 to 50 wt % of carbon.
15 . The molding core of claim 14 , wherein said metal complex contains up to 83 wt % of said second noble metal.
16 . The molding core of claim 13 , wherein said metal complex comprises Ru and Ta as said first noble metal, and Pd as said second noble metal.
17 . The molding core of claim 13 , wherein said hard coating further includes an intermediate layer that is sandwiched between said substrate and said protective film, said intermediate layer comprising a metal compound selected from the group consisting of metal oxide, metal nitride, and metal carbide, said metal compound comprising at least one metal selected from the group consisting of Ti, Cr, Nb, Zr, Al, and Si.
18 . The molding core of claim 17 , wherein said metal compound is titanium nitride.
19 . The molding core of claim 17 , wherein said intermediate layer has a thickness ranging from 20 to 200 nm.
20 . The molding core of claim 13 , wherein said substrate is made from tungsten carbide.