Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1994-05-31
1996-07-16
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
427422, E21B 1052
Patent
active
055358381
ABSTRACT:
A method to apply a high performance overlay to a metal substrate of a rock bit to render the substrate surfaces of the rock bit more resistant to erosion, corrosion and substrate cracking while performing in an earthen formation is described. The method comprises the steps of bombarding the surfaces with a thermal spray of entrained fine particles of a cermet based composition at a velocity in excess of 3,000 ft/per sec. The resultant coating of the cermet based composition has a tensile bond strength in excess of 20,000 psi that results in an increase of the strain to fracture of the rock bit surface. The hard overlay has a resistance to severe service environments of high strain and shock tolerance as well as a higher load carrying capacity.
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Kembaiyan Kuttaripalayam T.
Keshavan Madapusi K.
Mendenhall Melvin D.
Quantz Wayne C.
Quets Jean M.
Dang Hoang C.
Smith International Inc.
Upton Robert G.
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