Abstract: A new composition and methods for densifying a refractory oxide coating. The new composition includes two substituents. The first substituent is the reaction mixture produced by combining 80% formic acid and saturated aqueous chromic acid. The second substituent includes either phosphoric acid or monoaluminum phosphate. The proportions of the first substituent:second substituent vary from about 5:9 (weight:weight) to about 3:2 (weight:weight). A refractory oxide coating may be densified by first applying the new composition to the refractory oxide coating, then heating to a temperature of at least about 450.degree. F., followed by cooling. A refractory oxide coating may be further densified by repeating this process one or more additional times. Alternatively, the first and second substituents may be sequentially applied to the refractory oxide coating before heating and cooling operations.

Abstract: In order to reduce the rate of coke formation during the industrial pyrolysis of hydrocarbons, the interior surface of a reactor is coated with a uniform layer of a ceramic material, the layer being deposited by thermal decomposition of a non-alkoxylated organosilicon precursor in the vapor phase, in a steam containing gas atmosphere in order to form oxide ceramics.

Abstract: A housing for developing latent fingerprints is formed by positioning a thermally stable porous support material in a hollow tubular member and impregnating the support material with a liquid cyanoacrylate which is allowed to cure. The housing can be placed on an end of a portable heating device having sufficient heat to vaporize the cyanoacrylate and project the vapors against an object to be tested for latent fingerprints.

Abstract: A method for reforming hydrocarbons comprising coating portions of a reactor system with a material more resistant to carburization, reacting the material with metal oxides existing in the portions of the reactor system prior to coating, fixating or removing at least a portion of the oxide in the metal oxides, and reforming hydrocarbons in the reactor system under conditions of low sulfur.

Abstract: A method for coating metal cookware includes (a) roughening and cleaning a cooking surface of the metal cookware's inner wall by spraying aluminum oxide of 60-80 mesh onto the inner wall surface; (b) applying a mechanically resistant layer onto the roughened and cleaned cooking surface of the metal cookware by electric-arc spraying at a temperature of 4500.degree.-8000.degree. C., under a pressure of 5-8 kg/cm.sup.2, and with a voltage of 30-40 V and a direct current of 100-300 A, the mechanically resistant layer being made of a metallic material, and (c) applying a lubricative layer, which consists essentially of PTFE (polytetrafluoroethylene), onto the mechanically resistant layer by spray coating until the lubricative layer has a thickness of about 23-36 .mu.m and whereby a pencil hardness of 8-9H is achieved.

Abstract: This invention relates to an improved process for the thermal dehydrogenation of polysilicon granules in a fluidized bed reactor, the improvement which comprises introducing a varying electromagnetic field into the reactor whereby reactor walls are coated with silicon during the dehydrogenation.

Abstract: A method for reforming hydrocarbons comprising coating portions of a reactor system with a material more resistant to carburization, reacting the material with metal sulfides existing in the portions of the reactor system prior to coating, fixating and removing at least a portion of the sulfur in the metal sulfides, and reforming hydrocarbons in the reactor system under conditions of low sulfur.

Abstract: A method for the surface treatment of a metal workpiece which involves the generation between a major exposed portion of an anode and successive restricted areas of a first surface of the workpiece serving as a cathode, a vacuum arc discharge having an arc current which is not substantially less than 50 amp. and having a positive voltage-current gradient.

Abstract: Apparatus and method for simultaneously coating interior and exterior surfaces of articles, such as advanced turbine airfoils, the interior surfaces defined by narrow, complex passageways. The apparatus and method, in addition to providing for simultaneous coating of interior and exterior surfaces, also permits additional control over the coating process by permitting control over the partial pressure of reactive gas introduced into the reaction chamber. The apparatus also permits for subsequent thermal treatment of the coated parts in an inert gas atmosphere with no intermediate cooling step thereby reducing costs while eliminating the potential for damage due to handling by the elimination of at least one handling operation.

Abstract: A new composition and methods for densifying a refractory oxide coating. The new composition includes two substituents. The first substituent is the reaction mixture produced by combining 80% formic acid and saturated aqueous chromic acid. The second substituent includes either phosphoric acid or monoaluminum phosphate. The proportions of the first substituent:second substituent vary from about 5:9 (weight:weight) to about 3:2 (weight:weight). A refractory oxide coating may be densified by first applying the new composition to the refractory oxide coating, then heating to a temperature of at least about 450.degree. F., followed by cooling. A refractory oxide coating may be further densified by repeating this process one or more additional times. Alternatively, the first and second substituents may be sequentially applied to the refractory oxide coating before heating and cooling operations.

Abstract: A pipe coated with a resin layer on the inner surface and a method for manufacturing the pipe. According to the method, a resin mixture including thermal melting fluoro resin and fluorine elastomer is applied to the inner surface of a pipe member. The resin mixture is thermally treated on the inner surface of the pipe member to form a mesh like pattern so that a resin layer of a predetermined stripping strength is obtained.

Abstract: A composition is provided which, when applied to a metal surface, forms a corrosion-inhibiting film thereon. The composition comprises an epoxy resin, an effective amount of a curing agent for the epoxy resin, an alcohol, and a hydrocarbon diluent. The composition is applied by contacting the metal surface with the composition as one solution or as a hydrocarbon solution of the epoxy resin and a solution comprising the alcohol and the curing agent. The composition is particularly useful in the treatment of down-well metal surfaces in oil and gas wells to inhibit the corrosion of the metal.

Abstract: A method of applying a liquid coating material to the inside of a tank(10) and performing a hydrostatic pressure test on the tank at the same time. The method is useable for applying a liquid vitreous enamel coating material to a water heater tank, to be subsequently dried and furnace heated to form a glazed enamel internal coating. Preferably the hydrostatic pressure test is performed by displacing coating material from a portion(68) of an accumulator(51) by pumping liquid into a flexible bladder(66) housed in the accumulator. Pressure from pump(76) is transmitted to the tank(10 by the liquid coating material and held for a prescribed time interval to prove tank integrity. The method avoids excessive shear, hence viscosity changes in thixotropic coating materials.

Abstract: A pack cementation coating tape such as a nickel aluminide coating tape includes a reactive metal such as aluminum, a filler such as aluminum oxide, and a halogen carrier such as ammonium chloride held together by fibrillated polytetrafluoroethylene. The tape is useful in coating localized areas of nickel containing alloys to provide a nickel aluminide surface coating. The coating is formed by positioning the tape over the metal surface and heating the tape to a temperature of about 1250.degree. F. wherein the element metal such as aluminum reacts with the halogen carrier and in turn reacts with nickel on the surface of the nickel alloy to form the nickel aluminide coating. A masking tape formed from a separating layer, a brazing alloy layer and a nickel layer can be used to mask localized portions of the surface to prevent coating at these areas.

Abstract: HVAC systems having interior surfaces exposed to moist air are protected against fungal growth by coating the interior surfaces with an adherent flexible polymer film which includes a fungicidal composition in an amount effective to provide a zone of inhibition against multiple fungal species of at least 1 mm, and which employs active fungicidal ingredients which are substantially non-volatile and non-soluble in water.

Abstract: A shielding apparatus for use with a non-conductive package has an insulated lid (102) which is retained in contact with a substrate (104) for holding an electrical circuit. The shielding apparatus includes a first conductive flash (201) deposited on the interior surface of the insulated lid (102), to produce a substantially contiguous conduction layer, and a second conductive flash (203) deposited over a film (110) disposed on the edge of the insulated lid (102), to produce a partially contiguous conduction layer. The shielding apparatus also includes a layer (108) for affixing the insulated lid (102) to the substrate (104), to produce an enclosure for isolating the electrical circuit from extraneous radio frequency (RF) energy.

Abstract: In the cold drawing of steel tubing, an excellent lubrication which permits drawing the tubing while retaining its original metallic luster can be achieved by first contacting the surfaces of the tubing, both exterior and interior, with a colloidal titanium containing aqueous composition, drying the tubing, and then applying to the surface of the tubing a liquid lubricating composition comprising (i) from 40 to 95% of a first component selected from the group consisting of olefin/oil or olefin/fat compounds which contain from 23 to 30% of sulfur and olefin/higher ester compounds which contain from 23 to 30% sulfur, including mixtures of two or more chemical species meeting this description; and (ii) from 5 to 50% of a second component selected from the group consisting of oil soluble polymer compounds, fats and oils, synthetic oils, mineral oils, higher fatty acids, and the amine salts of higher fatty acids.

Abstract: A corrosion inhibitor with excellent film forming and film persistency characteristics may be produced by first reacting C.sub.18 unsaturated fatty acids with maleic anhydride or fumaric acid to produce the fatty acid Diels-Alder adduct or the fatty acid-ene reaction product. This adduct or reaction product is further reacted in a condensation or hydrolysation reaction with a polyalcohol to form an acid-anhydride ester corrosion inhibitor. The ester may be reacted with amines, metal hydroxides, metal oxides, ammonia, and combinations thereof to neutralize the ester. Surfactants may be added to tailor the inhibitor formulation to meet the specific needs of the user (i.e., the corrosion inhibitor may be formulated to produce an oil-soluble, highly water-dispersible corrosion inhibitor or an oil-dispersible, water-soluble corrosion inhibitor). Suitable carrier solvents may be employed where needed to effectively disperse the corrosion inhibitor formulation.

Abstract: A stabilized alpha metal matrix provides an improved ductility, creep strength, and corrosion resistance against irradiation in a zirconium alloy containing on a weight percentage basis tin in a range of 0.4 to 1.0 percent and typically 0.5; iron in a range of 0.3 to 0.6 percent, and typically 0.46 percent; chromium in a range of 0.2 to 0.4 percent, and typically 0.23 percent; silicon in a range of 50 to 200 ppm, and typically 100 ppm; and oxygen in a range 1200 to 2500 ppm, typically 1800 to 2200 ppm. The high oxygen level assists in reducing hydrogen uptake of the alloy compared to Zircaloy-4, for example.

Abstract: A method of pretreating the connecting elements of a gas-tight sleeve-type pipe connection which includes a tight metal seat and abutting joint shoulders. The connection is effected by screwing threaded pipe ends into a sleeve having threaded portions. The pipes are of high-alloy steel and the connecting elements are of austenitic steels with chromium and nickel contents of greater than 20% by weight and molybdenum contents of greater than 2.5% by weight, as well as austenitic materials with nickel contents of greater than 50% and chromium and molybdenum contents of greater than 10% by weight. The connecting elements of the sleeve are coated with a metal layer. The method includes cleaning the connecting elements and subsequently applying as a lubricant on the connecting elements a metal-free, ceramic-based paste whose principal components are silicates, titanium oxide, and zinc sulfide as solid components, as well as vegetable oils and white oils.

Abstract: A method for the application of a thermal spray coating to the cylinder wall portions of an aluminum engine block casting is disclosed in which the casting is inverted and water is caused to flow through the cooling passages of the engine block in a series flow from one end of a bank of cylinders to the other while the block is supported on a fixture that seals the cooling passage outlets in the head of the block. The fixture further permits the spray of a metallized coating onto the cylinder walls without adherence of the spray to the fixture or to other portions of the block.

Abstract: A small thick-walled composite metal fuel injection tubing for a diesel engine, for example, is manufactured from an outer carbon steel pipe, and an inner stainless steel pipe press-fitted in the large diameter carbon steel pipe by drawing. The press-fitted mating surfaces of the inner and outer pipes are metallurgically and integrally bonded together by heat-treating. As a result, at least an inside wall surface of the inner stainless steel pipe has a diffused layer of at least one kind of metal, or an alloy of two or more kinds ,of metals in combination, selected from the group consisting of Ni, Cr, Mo, Co, Al and Cu.

Abstract: A method of dispensing scaling inhibitors into a flow of low pressure water by modifying the use of available air lubricators. Mechanical modifications to an air lubricator results in an apparatus capable of dispensing a scaling inhibitor into a water flow of only 0.24 liters per minute.

Abstract: A method for treating tubulars, e.g. a pipeline, wherein an ungelled gelatin solution is mixed with fluids flowing through the tubular to deposit a treatment layer onto the wall of the tubular. The ungelled gelatin is injected into the flowing fluids at a temperature which is at or above the temperature of the fluids in the pipeline. This keeps the gelatin solution liquid (i.e. ungelled) even after mixing with the fluids. Gelatin derived from collagen is mixed with a liquid (e.g water) and heated. A separate treating solution (e.g. anti-freeze, corrosion inhibitor, and/or a drag reducer) can be added into the ungelled gelatin solution as it is mixed. The concentration of gelatin in the solution concentration of gelatin in said ungelled solution is the maximum amount which will allow the solution to remain ungelled at said the temperature of the flowing fluids.

Abstract: A superconducting conductor assembly using high temperature materials. A double-walled tubular structure has at least one helical strip of superconductive material on the inner wall of the inside tube. Brittle, non-ductile superconducting materials may be used. A coolant, typically liquid nitrogen, is circulated between the tubes to maintain the superconductor below the critical temperature of the superconductor. A buffer layer is preferably included between tube wall and superconductor. A plurality of alternating layers of buffer and superconductor may be used.

Abstract: The present invention relates to a coating solution for preventing adhesion of polymer scale and a method for preventing scale adhesion during preparation of polymers which can provide polymers having high quality without coloring thereof while preventing adhesion of polymer scale to a polymerizer when a monomer having an ethylenically unsaturated double bond is polymerized. A coating solution for preventing adhesion of polymer scale which comprises anaphthoquinone natural dyestuffs, anthraquinone natural dyestuffs, tannin natural dyestuffs, xanthone natural dyestuffs, flavonoid natural dyestuffs, or/and benzoquinone natural dyestuffs and a polyvinyl alcohol having a degree of saponification of not less than 70 mole % was applied on at least a part of a polymerizer which comes in contact with a monomer having an ethylenically unsaturated double bond and was dried to give a coating film during polymerization thereof.

Abstract: A process for converting the lubrication system of an internal combustion engine from a system using an oil containing metallic and chemical friction modifiers, to an oil substantially devoid of such modifiers. A solvent and a perfluoroethylene resin are added to the existing oil in the lubrication system of the engine in sufficient amounts to remove oil residue or varnish from the surfaces within the lubrication system, and to coat the surfaces with perfluoroethylene resin. The oil, solvent and perfluoroethylene resin are circulated throughout the lubrication system for a time sufficient to remove oil residue or varnish from the surfaces within the lubrication system of the engine, and to coat the surfaces with perfluoroethylene resin. The oil, solvent and residual perfluoroethylene resin are evacuated from the lubrication system of the engine, and an oil substantially devoid of metallic and chemical friction modifiers is added to the lubrication system of the engine.

Abstract: A composition is provided which, when applied to a metal surface, forms a corrosion-inhibiting film thereon. The composition comprises an epoxy resin, an effective amount of a curing agent for the epoxy resin, an alcohol, and a hydrocarbon diluent. The composition is applied by contacting the metal surface with the composition as one solution or as a hydrocarbon solution of the epoxy resin and a solution comprising the alcohol and the curing agent. The composition is particularly useful in the treatment of down-well metal surface in oil and gas wells to inhibit the corrosion of the metal.

Abstract: A method of manufacturing plated hollow metallic blocks for further processing into seamless tubes of the type in which a body is immersed one or more times into a melt includes: protecting the inner surfaces of a hollow body of plating material against the admission of a melt of support material during the immersion of the hollow body in the melt of support material; immersing such hollow body formed of plating material into the melt of support material; removing the hollow body from the melt of support material; and crystallizing a layer of support material on the outer surface of the hollow body.

Abstract: To rehabilitate an internally corroded underground pipeline, excavations are made at its opposite ends to which launching and receiving pipe structures are then secured. Various pig member sets, with appropriate treatment fluids carried thereby, are air-driven through the entire length of the pipeline to successively acid clean, etch, and neutralize its interior surface. The interior pipeline surface is then thoroughly dried by flowing dehydrated air through the pipeline. Specially designed leading and trailing extruder pigs, with 100% solid, high viscosity, solvent-free epoxy coating material therebetween, are then air-driven through the pipeline to extrude a first protective coating layer onto its interior surface. The first layer is then dried with dehydrated air.

Abstract: A metal oxidation treatment apparatus to form the passivation film on the surface of the metal to be oxidized such as stainless steel or the like, comprising an oxidation furnace, a gas inlet to introduce gas into said oxidation furnace, a discharge outlet to discharge the gas from said oxidation furnace, and a heater to heat said oxidation furnace to the predetermined temperature, so that the metal to be oxidized is heated and oxidized in dry oxidation atmosphere while gas is passed in said oxidation furnace.

Abstract: A metal oxidation treatment apparatus to form the passivation film on the surface of the metal to be oxidized such as stainless steel or the like, comprising an oxidation furnace, a gas inlet to introduce gas into said oxidation furnace, a discharge outlet to discharge the gas from said oxidation furnace, and a heater to heat said oxidation furnace to the predetermined temperature, so that the metal to be oxidized is heated and oxidized in dry oxidation atmosphere while gas is passed in said oxidation furnace.

Abstract: A glass vacuum flask coating method comprising a step to put a metal material in the gap between an inner flask and an outer flask before said inner and outer flasks being formed into a blank for a glass vacuum flask, after the process of exhausting and tipping-off said metal material being heated by a magnetic field generated from an inductance coil into a metal vapor inside said gap, permitting said metal vapor to be adhered to the glass surface inside said gap, forming into a metal reflecting film thereon.

Abstract: The present invention provides a method capable of lining a multibranch piping with a coating material within the pot life of the coating material without leaving an area uncoated or having to apply excessive repeated coatings. Lining of a main pipe is performed by pouring the coating material into the main pipe from an end portion of the pipe, and the lining of branch pipes is effected by the feed of the coating material and air for each of the branch pipes. A completed time point of lining in each branch pipe is detected by any one of the following methods:(A) A method wherein the time required for lining a branch pipe is estimated in advance and upon lapse of the estimated time it is determined that the lining of the branch pipe was completed.

Abstract: An ablating gelatin pig for use in tubulars which can easily negotiate the bends, etc in a tubular. Due to the properties of gelatin, the pig will ablate thereby depositing a protective layer onto the wall of the tubular. The pig can be molded outside the tubular or it can be formed in situ. The pig is formed by mixing common gelatin with a heated liquid and then allowing the mixture to cool to ambient temperature. Preferably, the liquid includes a treating solution (e.g. corrosion inhibitor, drag reducer, etc ) which is to be used to treat the pipeline. In some applications, a slug of the treating solution is also passed through the pipeline between two ablating gelatin pigs. For high temperatures applications, a hardener may be added to the pig to increase the melting temperature of the pig and/or a slug of the hardener can also be passed through the pipeline between two ablating gelatin pigs if necessary.

Abstract: A method for the powder pack coating of hollow structural components is performed with spherical powder particles of a donor metal in which the hollow component is embedded. During the embedding, the component is subjected to a tumbling motion about several spatial axes to fill all cavities in the component. After the powder pack coating process the cavities of the component are cleared of any excess powder particles under the action of a gas stream. This method is suitable especially for coating engine blades having cooling ducts and cooling air holes, such as turbine blades. The effect of the forced air flow through the internal cavities for the removal of excess powder out of the hollow component is enhanced by simultaneously vibrating the component.

Abstract: A method and apparatus for treating tubulars (e.g. pipelines, flowlines, tubing, casing, etc.) for corrosion, drag reduction, or the like wherein a mass comprised of a gelatin mixture and magnetic particles is passed through the tubular to deposit a protective layer onto the inner wall of the tubular. The micro particles of magnetized material are entrained within the mass of gelatin and are deposited along with the gelatin to aid in adhering the protective layer on the tubular wall.

Abstract: A sealant membrane for preventing leakage of fluids from fluid-containing tanks and a method of application of the membrane. The membrane is deposited in a varying thickness atop surfaces of interconnected wall panels in the tank by spray application of successive coats of a sealant material, so that the coating thickness is a maximum where the greatest structural deflections can occur. The successive coats are applied with a predetermined lapse time between layers to prevent slumping of the sealant material.

Abstract: In order to reduce the rate of coke formation during the industrial pyrolysis of hydrocarbons, the interior surface of the reactor tubes are coated with a thin layer of a ceramic material, said layer being deposited by thermal decomposition of a non-oxygen containing silicon organometallic precursor in the vapor phase, in an inert or reducing gas atmosphere in order to minimize the formation of oxide ceramics.

Abstract: An improved method of inserting a liner into a metallic pipeline is disclosed. The liner is formed from a plurality of concentric tubes that are enveloped in a flexible, expansible, tear resistant material. When the concentric tubes are pulled into the pipeline, the tear resistant material provides protection against tearing of the tubes by burrs, snags or other imperfections on the inside of the metallic pipeline. The tear resistant material may be a fabric, woven material or mesh. Materials having a structure that permits escape of fluid entrapped during subsequent expansion of the concentric tubes on formation of the liner are preferred. The method permits the lining of pipeline sections that have bends, loops or the like, while protecting the liner from tearing during insertion into the pipeline.

Abstract: The present invention relates to an improvement in a lining method for internal surfaces of pipes in multi-branched pipings such as water pipes, gas pipes, etc. in which a plurality of branched pipelines are branched from a main pipeline, and particularly to a shaping method for a lining surface.In a multi-branched piping in which a plurality of branched pipelines are branched from a main pipeline, a coating is poured into a pipeline from one end of a main pipeline or each of the branched pipelines, gas is then fed to thereby line the internal surface of the pipeline, a sponge consisting of an elastic foam body having a larger diameter than the inside diameter of the pipe constituting the pipeline, said foam body being made of synthetic resin and having a continuous foam, is inserted from an end of each branched pipeline, and the sponge is then pushed with the aid of air pressure whereby the lining surface can be shaped to have substantially uniform film thickness.

Abstract: The present invention refers to a process for inhibiting the formation of polymer buildup on the inner surfaces of a vinyl polymerization reactor by coating such surfaces with an alkaline solution of a linear or branched low molecular weight compound belonging to the poly(hydroxybenzyl) and poly(hydroxybenzylether) families and including their copolymers or blends. This process effectively reduces the adherence of polymeric material to the inner parts of the reaction vessel wherein substituted ethylene monomers are polymerized.

Abstract: A method and apparatus for automatically grit blasting and metal spraying a wall of a cylindrical vessel utilizing a pair of rails with arms slidably disposed thereon, which rotate 180.degree. in unison about the axis of the vessel and then reverse and are moved incrementally along the rails upon completion of each 180.degree. of rotation until the wall of the vessel is grit blasted by a grit blasting nozzle on each arm and then sprayed with multiple thin layers of molten metal by a molten metal sprayer on each arm. The grit blasting nozzle and molten metal sprayer may be interchangeably mounted on the arms or may be both installed and operated separately.

Abstract: A method for measuring the plating on the inside of a gun barrel, including he steps of providing ultrasonic pulses against a gun barrel to be plated, and plating the inside while monitoring the echoes from said waves from the inside and outside diameters of the barrel with a plurality of transducers aligned to reflect ultrasound waves from the outside and the inside surfaces of the gun barrel. Change in time for the return of waves from the inside surface indicates the change in thickness of plating on the inside of the barrel. The change is calculated by measuring the change in time for the wave to return to its source, and multiplying by the sound velocity.

Abstract: A method and apparatus for spraying a solid particulate powder onto the interior surface of tubular articles by intermittently pumping the powder from a fluidized bed of powder through a powder supply line containing an intermittently operated venturi pump and air amplifier, as well as a pair of constantly operated air diffusers and an electrostatic charging apparatus. A powder collection shroud adjacent at least one open end of the tubular article has a carefully regulated vacuum applied thereto in order to collect oversprayed powders.

Abstract: A method for the uniform coating of honeycomb bodies with finely divided solid matter from a dispersion in an amount which is below that which arises during customary immersion. To this end, the honeycomb is flooded from below with dispersion, emptied after a dwell time and blown out. Filling time, filling amount, dwell time emptying time as well as the time between emptying and blowing out are measured in such a manner that in order to increase the separated amount of solid matter, filling time, dwell time, pumping-out time and the time between emptying and blowing out are increased but the filling amount is reduced.

Abstract: A method of sealing a joint in a gas main comprising boring a hole in the wall of the main at a point spaced from the joint, inserting into the main through the hole so formed a sealant spraying means, moving the spraying means to the site of the joint, pumping a settable anaerobic type sealant to the spraying means, causing the spraying means to spray the sealant onto the inner wall of the main to form a layer covering the joint, removing the spraying means through the hole and allowing the sealant to set.

Abstract: The internal surfaces of a tank for liquids, for example a cargo tank or ballast tank of a ship, are coated by application of a metal plating composition to them by means of an applicator to form a metal layer at least 1 micron thick. The plating composition may be an electroless plating composition or an electroplating composition and is preferably thickened or gelled so that it is thixotropic or does not drip from downwardly facing surfaces.

Abstract: A method for manufacturing a pipe from a superconducting ceramic material is disclosed, which comprises providing a hollow supporting metallic body having a hollow inside section therein, introducing into the hollow inside section of the hollow supporting body a liquid into which is mixed a superconducting ceramic powder material comprising an oxidized copper material, drying the above liquid, so that the superconducting ceramic material is coated on the inside of the supporting body with a hollow space kept therein; and firing the supporting body and the ceramic material in an oxidizing atmosphere.

Abstract: The present invention discloses an apparatus and process for coating hollow objects at precise bands within the internal cavity of the object. The process utilizes centrifugal force to apply the fluid to the object. A probe is moved from underneath the object thereby utilizing gravitational forces to prevent spillage of the material from the probe. A computer controls the pumping rate, the vertical movement of the probe and the rotational speed of the probe to allow the machine to precisely coat a band on the internal cavity of an article. The computer controlled operation eliminates the necessity to waste material. One application of the invention is in the coating of the threads of nuts with Teflon.