Abstract
To solve the problems of high vibration, low lifespan, and frequent replacement of diamond thrust bearings, the tribological behavior and friction mechanism of cobalt-removed and untreated PDC under different axial loads and rotational speeds were investigated in the WBDFs. The results indicated that the cobalt-removed PDC had lower friction coefficients, smoother friction status, better wettability, and better wear resistance than the untreated PDC. Cobalt-removed PDC could avoid the occurrence of thermal wear in the friction process, and the main forms of surface abrasion were dominated by mechanical wear. This study provides the experimental basis for the use of cobalt-removed PDC as a friction pair material for diamond thrust bearings, which can promote further research and development of downhole drilling tools.
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