The study of microstructure of wear-resistant coatings applied for protection from abrasive wear of horizontal and tilt drilling drill bits

13th International Conference on Films and Coatings

Markova, I.Yu.^1 ; Zakharova, E.S.^1 ; Maslov, A.L.^1 ; Polushin, N.I.^1 ; Laptev, A.I.^1 ; Sovchinnikova, M.^1

National University of Science and Technology MISiS, Moscow, Russia^1

关键词: Diamond composites;    Gas-thermal spraying;    Micro-structural;    Steel substrate;    Tungsten carbide particles;    Vickers microhardness;    Wear-resistant coating;    X-ray phase analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/857/1/012028/pdf
DOI  :  10.1088/1742-6596/857/1/012028

来源: IOP

【 摘 要 】

Drill bits of the cutting type over the period of their existence have undergone significant changes - from the use of carbide cutters to diamond composite PDC elements, in which the diamond layer is applied to a hardmetal substrate. Using such elements, it was possible to significantly increase the service life of the drill bits, however, during work, there is a significant abrasive deterioration of the bit body, which does not fully realize the advantages of PDC elements. Therefore, to protect the body from wear use special wear-resistant coatings. This work is devoted to research of microstructural coatings, namely coatings brands WokaDur NiA, HR-6750, HR-6750 with sublayer Rock Dur 47 on various steel substrates which applied by the gas-thermal spraying in Ltd "Oerlikon Metko Rus". They were examined with the use of scanning electron microscopy, X-ray phase analysis and a Vickers micro-hardness tester. It was established that the microhardness of the coating matrix is 590-660 HV, and the microhardness of tungsten carbide particles reinforcing the coating, is 2145-2455 HV.