High performance overlay for rock drilling bits
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United States of America Patent
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Jul 16, 1996
Issued Date -
N/A
app pub date -
May 31, 1994
filing date -
Mar 19, 1993
priority date (Note) -
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status (Latency Note)
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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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