Al-armor

Reusable Wearbands, LLC

Joseph A Downie

Bruce M Warnes

Roger W Kaufold

Andrew C Towns

A protective coating for aluminum alloys, electrode for producing same and a coating process using the welding electrode. The protective coating and electrode comprise a composite consisting essentially of alumina particles in a matrix, wherein the matrix is a metal selected from the group consisting of aluminum or an aluminum alloy. The alumina particles consist of aluminum oxide in powder form. The coating process using the welding electrode above comprises the steps of: electro-spark depositing a composite on to a substrate, wherein the composite consists essentially of alumina particles in a matrix, wherein the matrix is a metal selected from the group consisting of aluminum or an aluminum alloy. The substrate herein is an aluminum alloy. The coatings involve only aluminum and aluminum compounds, thereby intermetallic compound formation and galvanic corrosion of the coating-substrate materials system is avoided.

Metallurgically bonded wear resistant texture coatings for aluminum alloys and metal matrix composite electrode for producing same

A wear band for a well drill pipe which is made up of a coil spring sized to fit at the joint of the well drill pipe or casing. The inner surface of the coil spring includes a textured coating such as a carbide. The outer surface includes a plurality of hydrodynamic dimples defined therein, and preferably both the outer surface and the inner surface are adapted to resist corrosion. The abrasive coating preferably consists essentially of 95% tungsten carbide and a binder of 5% cobalt and coats an amount of the inner surface in the range of 50% to 100%. The hydrodynamic dimples are generally tear drop in shape to act as miniature fluid pumps. As a result, the wear band can be mechanically attached to the drill pipe while eliminating the need for metallurgically-welded hardbands and therefore unaffecting the drill pipe properties and dimensions.

Growing community of inventors

Okatie, SC, United States of America

Joseph A Downie