Rock bit seal and bearing surfaces enhanced by papvd overlay...

Details Rock bit seal and bearing surfaces enhanced by papvd overlay... Rock bit seal and bearing surfaces enhanced by papvd overlay...

B - Operations, Transporting

05

D

255/78

B05D 3/06 (2006.01)

Patent

CA 1223005

ROCK BIT SEAL AND BEARING SURFACES ENHANCED BY PAPVD OVERLAY COATING ABSTRACT OF THE DISCLOSURE Rollinq cone rock bit seal and bearing hard sur- faces having been made fully ready for assembly are first provided thin overlay coatings to enhance the resistance of the surfaces to both wear and corrosion. The coating is an engineering ceramic comprised of at least one nonmetallic element selected from a list con- sisting of C, O, and N, combined with at least one metallic element selected from a list consisting of Ti, Hf, Zr, Nb, Ta, W, B, A1, Co, and Cr. In a modi- fied physical vapor deposition process, the selected coatings will be developed at a temperature not to exceed 400° Fahrenheit. -23-

453617

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