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Turbine Metal Technology, Inc.

G Kelly Sievers

Rajan K Bamola

Drill bits having projecting inserts are completely coated with refractory material including on the edge margins about the inserts by thermally spraying with refractory particles whose particulate constituent under the spraying conditions is able to penetrate the inserts. Completely coated drill bits are provided.

Method of forming an uninterrupted refractory coating on a downhole

Downhole drill bit cone with uninterrupted refractory coating

Mechanical devices having relatively moving parts subject to galling or scoring by contact of the parts are effectively repaired by coating the surfaces to be treated with a composition comprising a hardenable epoxy resin, a reinforcing filler, and an amount of an agent such as graphite or molybdenum disulfide capable of reducing the coefficient of friction of the said composition.

Repair composition and method

In the method of forming diffusion coatings for improved corrosion, erosion or wear properties in high performance alloy structures, the coatings being characterized by the intimate presence of an interdispersed phase material in desired amount to enhance one or more of these properties, which includes interdiffusing under non-oxidizing conditions a portion of the structure surface and an alloying element disposed therewith, such as aluminum, in a diffusion pack of predetermined composition desirable for the interdiffusion, the improvement comprising maintaining the desired amount of interdispersed phase material relatively richly concentrated within a selected pack zone corresponding to the locus of interdiffusion for intimate diffusion coating interdispersal from the pack zone in interdiffusion responsive relation and freely of varying the predetermined composition of the pack.

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Burbank, CA, United States of America

G Kelly Sievers