Ag–Mo co-implantation Cr-Ti-B-N films Cu-Al/MoS2 coatings Cu/MoS2 coatings DLC GH4169 alloy History of engineering & technology MoS2 Raman spectroscopy TiB2 VCN–Cu films ZrB2 acoustic emission adhesion annealing treatment anti-wear bonding strength coating coating blade elastomer elevated temperature friction friction and wear friction property graphene high-entropy alloy (HEA) matrix coating ion-beam-assisted bombardment technology (IBAB) magnetron sputtering mechanical microhardness