Method of forming an uninterrupted refractory coating on a downhole drill bit cone
OwnerG. Kelly Sievers, Rajan K. Bamolainventors
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Abstract
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.
Claims16
Method of coating a drill bit having refractory inserts projecting therefrom out of supporting pockets having edge margins surrounding said inserts, including thermally spraying refractory particles comprising binder and refractory particulate against the bit and inserts under conditions such that said refractory particles penetrate said inserts and do not bounce back from said inserts so as to leave said edge margins about said inserts uncoated, whereby said thermally sprayed refractory particle coating on said inserts and on said bit join in a bridge coating on said pocket edge margins to form a continuous, uninterrupted coating over said bit and said inserts which protects said edge margins.
Dependencies are inferred from the claim text.