▎ 摘　　要

NOVELTY - Processing titanium alloy space sampling drill comprises (S1) grinding, polishing and cleaning the surface of the titanium alloy drill bit, (S2) annealing the titanium alloy drill bit pretreated in step (S1), (S3) performing ultrasonic surface nanocrystal, or twinning strengthening treatment on the titanium alloy drill bit annealed in the step (S2), (S4) cleaning the titanium alloy drill bit processed in the step (S3), and placing the cleaned titanium alloy drill bit on the cathode disk of the ion nitriding furnace for nitriding treatment, (S5) dispersing the graphene in the mixed solution of dehydrated alcohol, N-methylpyrrolidone and polyvinylpyrrolidone to obtain graphene dispersion, (S6) spraying the graphene dispersion liquid obtained through the treatment of step (S5) to the titanium alloy drill bit subjected to the nitriding treatment in step (S4), and (S7) drying. USE - The method is useful for processing titanium alloy space sampling drill. ADVANTAGE - The method improves the friction reduction and wear resistance of the titanium alloy drill bit. DETAILED DESCRIPTION - Processing titanium alloy space sampling drill comprises (S1) grinding, polishing and cleaning the surface of the titanium alloy drill bit, (S2) annealing the titanium alloy drill bit pretreated in step (S1), (S3) performing ultrasonic surface nanocrystal, or twinning strengthening treatment on the titanium alloy drill bit annealed in the step (S2), (S4) cleaning the titanium alloy drill bit processed in the step (S3), and placing the cleaned titanium alloy drill bit on the cathode disk of the ion nitriding furnace for nitriding treatment, (S5) dispersing the graphene in the mixed solution of dehydrated alcohol, N-methylpyrrolidone and polyvinylpyrrolidone to obtain graphene dispersion, (S6) under the protection of argon gas, spraying the graphene dispersion liquid obtained through the treatment of step (S5) to the titanium alloy drill bit subjected to the nitriding treatment in step (S4), and (S7) drying the titanium alloy drill bit sprayed in step (S6) to obtain nitride-graphene composite coating on the surface of the titanium alloy drill bit. An INDEPENDENT CLAIM is also included for titanium alloy space sampling drill, comprising titanium alloy space sampling drill body, and titanium alloy nitride graphene composite coating obtained by the above processing method.