The Dow Chemical Company

University of Pittsburgh

Patrick L Hagans

Ronald L Yates

Benjamin M DeKoven

Charles D Gartner

John T Yates, Jr

Vincent S Smentkowski

Novel ceramic or metal-ceramic articles having a low friction surface are produced by a tribochemical method. The low friction surface is produced by wear scarring under high vacuum opposing, articulating ceramic or metal-ceramic surfaces until low friction is obtained. The invention is useful in the preparation of bearings for use in outer space.

Method of producing low friction under high vacuum on a ceramic or

Novel ceramic or metal-ceramic articles having an oxidized surface are produced by a tribochemical method. The oxidized surface is produced by initially wear scarring, under high vacuum, opposed, articulating ceramic or metal-ceramic surfaces and, thereafter, continuing the wear scarring in the presence of oxygen or air at less than atmospheric pressure. A method of welding ceramic or metal-ceramic articles is also disclosed.

Tribochemical method of producing an oxidized surface on a ceramic or

A method of catalytic oxidation of organophosphonate esters includes introducing the organophosphonate esters in gaseous form into contact with a molybdenum catalyst and effecting such introduction in the presence of oxygen to cause the organophosphonate ester to be oxidized on the molybdenum catalyst surface. The process is preferably carried out at a temperature of at least 900.degree. K. in the presence of excess oxygen. A chemisorbed oxide coating or molybdenum oxide coating or both may be established on all or part of the molybdenum catalyst. Among the organophosphonate esters which may be oxidized in this manner are dimethyl methylphosphonate, diisopropyl methylphosphonate, diphenyl methylphosphonate, and other molecules with the structure: ##STR1## The catalytic oxidation results in emission of carbon monoxide and phosphorus oxides(s) without undesired buildup of carbonaceous or phosphorus overlayers on the Mo catalyst surface.

Heterogeneous catalytic oxidation of organophosphonate esters

The invention is an oxalloy consisting essentially of about 5 to about 57 weight percent magnesium or aluminum and about 0.5 to about 10 weight percent of one or more alloying materials selected from the group consisting of B, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, As, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, Ga, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au, Tl, Pb, Bi, Th, and rare earths; and the remainder oxygen. The invention also includes a method for forming the above oxalloys and a substrate coated with the oxalloys of the present invention.

Corrosion resistant magnesium and aluminum oxalloys

A process is disclosed for the protection of magnesium based alloys containing aluminum by treatment with eutectic mixtures of fused salts to provide a corrosion resistant outer layer on the magnesium based alloy. A suitable fused salt mixture comprises urea and at least one of ammonium nitrate or ammonium nitrite. A magnesium based alloy is also disclosed comprising magnesium and aluminum having a corrosion resistant outer layer comprising magnesium oxide and aluminum oxide; the proportion of aluminum present in the outer layer being enriched in proportion to the amount present in the magnesium based alloy.

Formation of a protective outer layer on magnesium alloys containing

Method of making corrosion resistant magnesium and aluminum oxyalloys

The invention is an improved method for depositing a chromite coating onto a magnesium-containing material comprising:

Growing community of inventors

Midland, MI, United States of America

Patrick L Hagans