Patent ID: 8911867

Claim:
A protective coating, having the chemical composition C a Si b B d N e O g H l Me m , wherein Me is at least one metal of the group consisting of {Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W, Y, Sc, La, Ce, Nd, Pm, Sm, Pr, Mg, Co, Ni, Fe, Mn}, with a+b+d+e+g+l+m=1, and 0.45≦a≦0.98 0.01≦b≦0.40 0.02≦d≦0.10 0≦e≦0.35 0≦g≦0.20 1≦l≦0.35 0≦m≦0.20, and wherein the coating contains amorphous carbon which is not chemically bonded to Si or B at a content that satisfies 3.2≦Ix/Iy≦8.0, wherein Ix represents the peak of intensity of amorphous carbon in Raman spectrum, and Iy represents the maximum intensity in the background in Raman spectrum.