Union Carbide Corporation

Smith International, Inc.

Praxair S.t. Technology, Inc.

Union Carbide Coatings Service Technology Corp.

Jean M Quets

John E Jackson

Robert C Tucker, Jr

Thomas A Adler

Marianne O'Connor Price

Henri Hatwell

Madapusi K Keshavan

Robert Wagner Meyerhoff

Homer Fay

Wayne C Quantz

Kuttaripalayam T Kembaiyan

Melvin D Mendenhall

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.

High performance overlay for rock drilling bits

A duplex coating for substrates that comprises an undercoat of tungsten carbide-cobalt having a strain-to-fracture of greater than 4.3.times.10.sup.-3 inch per inch and a top coat of a ceramic material such as alumina in which the ratio of the thickness of the top coat to the undercoat is from 6:1 to 1:3.

Duplex coatings for various substrates

An improved erosion resistant coating for a gas path component of a turbo machine which comprises the thermal spraying of a chromium carbide, such as Cr.sub.3 C.sub.2, and an age hardenable nickel base alloy, such as Inconel 718, onto the gas path component and then, preferably, heat treating the deposited coating to harden the coating.

Process for producing chromium carbide-nickel base age hardenable alloy

The invention relates to a coated article comprising a substrate coated with a tungsten carbide-cobalt layer having a strain-to-fracture greater than 4.3.times.10.sup.-3 inch per inch and a Vickers hardness of greater than about 875 HV.sub.0.3.

Tungsten carbide-cobalt coatings for various articles

A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 6.5 to about 9.0 weight percent cobalt, from about 2.0 to about 4.0 weight percent chromium, from about 3.0 to about 4.0 weight percent carbon and the balance tungsten.

Wear and corrosion resistant coatings and method for producing the same

A coating composition applied to a substrate by a thermal spray process which consists essentially of from about 11.0 to about 18.0 weight percent cobalt, from about 2.0 to about 6.0 weight percent chromium, from about 3.0 to about 4.5 weight percent carbon and the balance tungsten.

High strength, wear and corrosion resistant coatings and method for

High strength, wear and corrosion resistant coatings

Particles of different densities are separated from admixture by ferrohydrodynamic movement in a liquid magnetic medium into zones thereof and retained in said zones upon solidification of said liquid medium.

Process for separation of non-magnetic particles with ferromagnetic media

Separation of a mixture of non-magnetic particles on the basis of their different densities is accomplished by levitation in a magnetic fluid using a multiplicity of magnetic gaps created by a grid of magnetic poles oriented with respect to each other such that the polarity of the magnetic field generated in each gap is opposite to that of each adjacent gap.

Apparatus and process for the separation of particles of different

Sub-micron metal oxide powders, such as barium titanate, are prepared by mixing a carbohydrate material with solution of barium and titanium compounds, and in some instances other metal compounds, followed by ignition and calcining of the mixture to give sub-micron size particles of barium titanate loosely held together in friable aggregates. For economic reasons as well as their commercial availability, inorganic chlorides are suitable for use as one or more of the starting compounds. However, the presence of a chloride compound greatly influences the thermal stability of that compound in the mixture and hence its rate of decomposition was found to be slow. Accordingly, after the ignition step any chlorides present in the mixture are removed before calcination. The process provides a means for the direct formation of barium titanate free of unwanted phases and which is chemically pure. Barium titanate can also be prepared as an intimate mixture or as a solid solution with other oxides.

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Indianapolis, IN, United States of America

Jean M Quets