Abstract
With the increased difficulty of drilling into hard rock in the petroleum industry, the demand for higher performance and efficiency of impregnated diamond bits (IDB) has risen sharply. This paper describes the effect of Mo2C coatings on the wear properties and working efficiency in Fe-Ni-WC-based IDBs. The Mo2C-coated diamonds were obtained via the molten salts method. The diamond/Fe-Ni-WC IDBs were prepared by vacuum hot-press sintering method. Laboratory drilling tests of IDBs were carried out to evaluate the wear performance of the two drilling bits. An ultra-depth field 3D imaging microscope was performed to measure the protrusion height of diamond particles on the bottom surface of IDBs. The results manifested that the addition of the Mo2C coating contributed to increasing the protrusion height of diamonds, meaning the enhancement of the interface strength between the diamonds and matrix. The drilling rate of the Fe-Ni-WC-based IDB with Mo2C-coated diamonds is 18% higher than that of Fe-Ni-WC-based IDB with uncoated diamonds, accompanied by increased wear loss.
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