Abstract: A method is taught for application of an abrasive tip to a gas turbine blade by brush plating, wherein particulate abrasive is applied to the tip of said blade and held in position during electroplating by a porous dielectric cloth.

Abstract: A method for use in photochemical machining of titanium or zirconium substrate articles. A coating of silver is deposited onto the substrate and a photoresist is applied onto this coating. The photoresist is selectively patterned and removed from unexposed areas thereof. The silver coating is then selectively removed from the substrate at areas not covered by the photoresist without removing material from the substrate. Photochemical etching is then performed to remove material from the substrate at areas thereof not covered by the silver coating. The remaining silver coating may then be removed to yield a titanium or zirconium workpiece having the desired pattern etched into the surface thereof.

Abstract: Titanium and titanium alloy particles are provided with improved mechanical properties through the use of ion implantation. Ions of elements selected from the noble metals and titanium are employed. Ion energies of 50-200 kev and ion densities of at least 10.sup.14 ions/sq. cm. are employed.

Abstract: Chemical milling of cast superalloys having high tungsten contents is advantageously accomplished with an etchant which consists by volume percent of 40-60 concentrated HNO.sub.3, 0.6-0.8 concentrated HF, 30-70 H.sub.2 O, with which is included at least 0.008 moles/liter CuSO.sub.4 and 0.0016-0.025 moles/liter FeCl.sub.3. Preferably the molar ratio of CuSO.sub.4 to FeCl.sub.3 is 2:1 and etching is accomplished in the range 50.degree.-80.degree. C.

Abstract: Method and protective coating composition for preventing or minimizing costion or melting of titanium and combustible alloys thereof. Two layers of coatings are applied, the first layer preventing diffusion of the second layer into the titanium or alloy even at elevated temperatures, and the second layer suppressing titanium combustion. The first layer contains chromium, molybdenum, niobium, tantalum, vanadium, zirconium, platinum, or rhodium or a combination thereof or alloy of any of these metals. The second layer contains copper, aluminum, gold, nickel, silver, cobalt or a combination thereof or alloy of any of these metals. By preventing diffusion of the second layer into the substrate, the first layer prevents degradation of substrate engineering or mechanical properties.

Abstract: An effective cyanide free solution and process for removing gold-nickel braze alloys from superalloy parts are described. The solution contains about 50% nitric acid with intentional additions of materials which ionize to provide chloride ions, sulfate ions, and metal ions in specific concentrations.

Abstract: A method for electrolytically etching metals. Nickel superalloys are etched with uniform grooves using a 10 volume percent HCl aqueous solution and periodically reversed current. An aperture containing shield is interposed between an upward facing workpiece and an electrode. The shield is adapted to divert gases evolved at the workpiece from passage to electrode. Controlled roughness in an etched surface is produced by varying electrolyte temperature. Preferred smooth finish is obtained at 7.degree. C.

Abstract: An apparatus for electrolytically etching a precision groove pattern in a metal workpiece. A concave shaped shield having a small aperture contains the electrode. The shield diverts gases evolved at the upward facing workpiece away from the electrode while still allowing circulation of electrolyte about the electrode.

Abstract: The adherence and wear resistance of chromium alloy electroplates on titanium is improved by pretreating the substrate to form a chromium conversion coating, and post-treating the substrate at a temperature at about 700-820.degree. C. (1300-1500.degree. F.) for about 1-300 hours. The pretreatment is comprised of the formation of a chromium conversion coating from an acid chromate solution; a preferred solution is comprised of hydrofluoric acid, sodium chromate, and water. The post treatment causes diffusion sufficient to obtain a bond but avoids completely interdiffusing the chromium alloy electroplate, to preserve the wear resistance of the electroplate surface.

Abstract: A process for treating the surfaces of a titanium or titanium alloy article which comprises immersing the titanium article in an aqueous solution of ammonium phosphate and then oxidizing the surface by heating the coated article at a temperature of about 800.degree. F for about 20 hours.

Abstract: Chemical milling of cast superalloys having high tungsten contents is advantageously accomplished with an etchant which consists by volume percent of 40-60 concentrated HNO.sub.3, 0.6-0.8 concentrated HF, .[.30.]..Iadd.40.Iaddend.-70 H.sub.2 O, with which is included at least 0.008 moles/liter CuSO.sub.4 and 0.0016-0.025 moles/liter FeCl.sub.3. Preferably the molar ratio of CuSO.sub.4 to FeCl.sub.3 is 2:1 and etching is accomplished in the range 50.degree.-80.degree. C.