Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1997-04-16
1998-12-01
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175374, 384 95, E21B 1022
Patent
active
058425314
ABSTRACT:
A rotary rock bit is formed as a rock bit body, a bearing shaft supported by the rock bit body, a rotary cutter adapted to be rotatably mounted on the bearing shaft, and at least one bearing that promotes rotation between the rotary cutter and the bearing shaft. Each bearing includes a bearing element having a steel matrix with steel-free volumes distributed therethrough. The matrix is a hypoeutectoid steel having more than about 0.40 weight percent carbon. An anti-galling alloy resides within the steel-free volumes of the steel matrix. The anti-galling alloy is a silver-copper alloy having a composition of from about 60 weight percent to about 95 weight percent silver, balance copper.
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L.A. Zagorski et al., "The Effect of the Furnace Atmosphere on the Infiltration of Iron-Powder Compacts," International Journal of Powder Metallurgy, vol. 7, No. 2, pp. 41-53 (1971).
Dresser Industries Inc.
Garmong Gregory
Tsay Frank
LandOfFree
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