To the disadvantage of the traditional black coloring

Ti/DLC film was deposited on 925 silver alloy substrate by sputtering coating combined with anode-layer ion source

and the properties of the films under different process parameters were analyzed.The results show that by changing the negative bias

working gas partial pressure and depositing time

the Ti/DLC film can achieve pure and glossy black coating

and its microhardness and critical scratching load can be adjusted.When Ti film is sputtering coated on 925 silver alloy substrate with the negative bias of-120 V

argon partial pressure of 0.40 Pa and depositing time of 10 min

and DLC film is deposited on Ti film with the negative bias of-180 V

C2H2partial pressure of 0.25

0

.30 Pa and depositing time of 40

4

5min

the Ti/DLC film exhibits the relatively desirable comprehensive performances

including the appearance decorative effect

corrosion resistance and mechanical properties.