Abstract: A method for treating the surface of a titanium alloy comprising a pretreatment process for cleaning a workpiece to be treated comprising a titanium alloy with an acid, a heating process for heating the pretreated workpiece in an oxidative atmosphere for a predetermined period of time to form a composite layer comprising oxide layers and oxygen-enriched layers on the surface of the workpiece, and a descaling process for rapidly quenching the treated workpiece to remove a scale layer formed as an outermost layer of the composite layer on the surface of the workpiece; or, without the pretreatment process, comprising the heating process, the descaling process, and an aging process for aging by maintaining the workpiece at a predetermined temperature; or, comprising the pretreatment process, the heating process, the descaling process, and the aging process, thereby adequately improving the abrasion resistance and burning resistance of the workpiece and preventing an increase in abrasion of a partner part sliding

Abstract: Disclosed herein is cobalt-containing precious metal material for decoration which comprises cobalt and one or more precious metals selected form the group consisting of Au, Ag, Pt and Pd, at least the cobalt on the surface being oxidized.Also disclosed herein is a process for preparing cobalt-containing precious metal material for decoration which comprises blending cobalt and one or more precious metals selected from the group consisting of Au, Ag, Pt and Pd, and oxidizing the blend in an oxidative atmosphere so as to form the oxidized cobalt on the surface of the material.

Abstract: This invention permits, in a colored galvanized coating using Ti--Zn, Mn--Zn, Ti--Mn--Zn, (Ti, Mn)--(Cu, Ni, Cr)--Zn, etc., to clearly and stably develop yellow, purple, green, blue or other color by controlling the composition of a galvanizing bath and oxidizing conditions. Further, gold, dark red, olive gray and iridescence color which have not yet obtained can be developed. The color development effected by this invention is clearer than conventional. Instead of galvanizing, the spraying process may be adopted. The surface painting on the colored zinc coating is effective.

Abstract: Protective coatings are applied to substrate metals by coating the metal surface, e.g. by dipping the substrate metal in a molten alloy of the coating metals, and then exposing the coating at an elevated temperature to an atmosphere containing a reactive gaseous species which forms a nitride, a carbide, a boride or a silicide. The coating material is a mixture of the metals M.sub.1 and M.sub.2, M.sub.1 being zirconium and/or titanium, which forms a stable nitride, carbide, boride or silicide under the prevailing conditions. The metal M.sub.2 does not form a stable nitride, carbide, boride or silicide. M.sub.2 serves to bond the carbide, etc. of M.sub.1 to the substrate metal. Mixtures of M.sub.1 and/or M.sub.2 metals may be employed. This method is much easier to carry out than prior methods and forms superior coatings. Eutectic alloys of M.sub.1 and M.sub.2 which melt substantially lower than the melting point of the substrate metal are preferred.

Abstract: The quality of superconducting cavity resonators depends to a very great extent on the surface quality of the cavities. The invention relates to a process for the manufacture of superconducting cavity resonators with improved surface quality, whereby even complex shaped cavity resonators can be made with cavities coated with NbN.

Abstract: A process for production of a calcium phosphate compound-coated composite material is disclosed, comprising oxidizing a metallic substrate to form a layer of the oxide of the metal component of the metallic substrate on the surface thereof, and forming a coating layer of a calcium phosphate compound on the surface of the oxide layer.