Adhesion between the film and the substrate is a key factor to determine the performance of the films.Due to the low adhesion of diamond-like carbon(DLC)film on cemented carbide,the DLC films with different W interlayer(single W layer,single WC layer,W bilayer,and W trilayer)were deposited on cemented carbide YG8substrate by a novel linear ion beam source composited with a DC magnetron sputtering process.The mechanical and tribological properties of DLC films were evaluated.The results show that the DLC films with different W interlayers are dense,and the interfacial columnar structure with the increased layers is interrupted,which is conducive to improve the toughness of DLC films.For the DLC film with W trilayer,its the biggest toughness is 6.44MPa路m~(1/2). The hardness decreases, howerver,the residual stress can be reduced by 55%compared to the film with single W layer and the adhesion strength reaches to 85N.Additionally,this film has lower friction coefficient and wear rate,which exhibits excellent anti-wear and anti-friction properties
