Showing papers on "Coating published in 1973"

Surgical prosthetic device with porous metal coating

Abstract: A novel surgical prosthetic device having many useful surgical applications comprises a composite structure. The composite consists of a solid metallic material substrate and a porous coating adhered to and extending at least partially over the surface of the substrate. The porous coating has certain critical characteristics, and the individual values depend on the end use to which the device is put. There are described a number of surgical and dental applications.

Process for electrophoretic deposition of polymer

Abstract: An improved process for electrophoretically coating polymer on an electrode comprising maintaining the electrode that is being coated with polymer at a temperature at least above that of the continuous phase for a time that is sufficient to produce a polymer film coating the electrode, that after baking at a temperature and for a time that is sufficient to harden the film, has a greater resistivity than a film that is coated under the same conditions with the exception that an elevated temperature is not maintained.

Coating heat softened particles by projection in a plasma stream of Mach 1 to Mach 3 velocity

Abstract: An electric arc plasma spray gun provides optimum coating of substrates by projecting a stream of plasma at a velocity at or about Mach two, at ambient pressure, and entraining therein particles of material to be coated upon said substrate. Power, pressures and temperatures are employed together with a unique set of interchangeable supersonic nozzles to achieve particle exit velocities of from one to ten thousand feet per second, heating said particles to a temperature below their melting point but sufficient to soften the particles for enhanced coating. Unique parameters of particle size, particle injection angle and particle injection positions are identified for different materials to be entrained in the supersonic plasma stream.

Spot printing of color-forming microcapsules and co-reactant therefor

Abstract: Copy sheets are provided having a localized coating of microcapsules by passing an uncoated paper web through a roll nip formed from a first roll and a raised portion of a second roll, wherein the first roll is an impression roll and the second roll is a printing roll having only a portion of its surface provided with a resilient material to provide a raised, resilient printing head on the second roll. A suspension of microcapsules containing a chromogenic material is coated onto the paper web as it passes between the first and second rolls in a configuration corresponding to the resilient printing head. The coated paper web is then passed to a drying zone where the microcapsular coating is dried. The same technique is used to provide a local coating of an electron-accepting material, such as acidic clay, on a receiving sheet, which may be used in combination with a local microcapsule coating which may be superimposed over the clay coating. Upon rupture of the microcapsules, the chromogenic material is released therefrom and reacts with the acidic clay to provide a localized image. In this manner a minimum of microcapsules and clay are required to produce a transfer copy system.

Self-crosslinking cationic electrodepositable compositions

Abstract: It has been found that aqueous coating compositions comprising the reaction product of a partially-blocked organic polyisocyanate, an amine adduct of an epoxy group-containing resin and a catalyst for urethane formation can be electrodeposited. These compositions deposit on the cathode to provide coatings having excellent properties.

Method and apparatus for effecting high-energy dynamic coating of substrates

Abstract: An electrical plasma-jet spray torch is adapted to effect spray coating of substrates in a reduced-pressure chamber, at supersonic plasma velocities, thereby achieving extremely dense coatings of high-purity material. The spray powder is preheated to a predetermined temperature before entering the plasma, and is delivered simultaneously to the plasma from a plurality of powder sources. Both the plasma and a transferred arc are employed to preheat the substrate to a predetermined temperature, before the spraying operation commences. Furthermore, the plasma is employed to effect post-annealing and stress-relieving functions. The transferred arc power source is connected between the plasma torch and the substrate, to add energy to the powder while in flight and to provide a fusion bond between the coating and the substrate. The gaseous environment in the spray chamber, and in the powder-inlet passages, is carefully selected and controlled to achieve desired results.

Laser production of lithographic printing plates

Abstract: The use of a laser beam to etch the surface of a printing plate made from a polymer composition on a metal or plastic base and a thin top coating of a hard hydrophilic material produces a lithographic printing plate capable of accepting ink in the etched region and accepting water in the unetched regions.

Cutting instruments and methods of making same

Abstract: The specific disclosure is directed to razor blades and methods of making the same wherein the cutting edge formed by two intersecting surfaces is sputter deposited with a refractory material which is subsequently overlaid with a sputter deposited coating of material displaying adhesion to a final lubricious coating.

Method of bonding metals together

Abstract: A wire of a soft metal, such as gold, silver, or copper, can be ultrasonically bonded to a base metal substrate by coating the wire with a thin layer of an alloy of nickel-phosphorus, coating the substrate with a relatively thicker layer of an alloy of cobalt-phosphorus, and applying ultrasonic vibratory energy between the coated wire and the coated substrate A portion of the thin layer of the nickel-phosphorus is worn away during the application of the ultrasonic vibratory energy, and the wire is bonded directly to the relatively thicker layer of cobaltphosphorus

Aqueous coating composition of an acrylic polymer having reactive sites and an epoxy resin

Abstract: The aqueous coating composition of this invention is useful as a formable coating for the interior and exterior of cans and contains the following compatible mixture of film-forming constituents: (a) an acrylic polymer that has at least two or more reactive sites per chain such as carboxyl, hydroxyl, epoxide, methylol, amine or amide and has a number average molecular weight above 10,000 and a glass transition temperature of -20° C. to +60° C.; and (b) an epoxy resin that has at least one epoxide group in combination with at least one hydroxyl group or epoxide group or combination thereof per polymer chain and has a number average molecular weight of 300 to 20,000; Wherein the film-forming constituents in the fully cured state have a brittle ductile transition temperature of -40° C. to +20° C. measured at an elongation rate of 10% per minute.

Method for treating metal surfaces with compositions comprising zirconium and a polymer

Abstract: The corrosion resistance and siccative finish bonding characteristics of a metal surface are improved by contacting the surface with an aqueous composition consisting of a soluble zirconium compound and a polymeric material. The aqueous composition can be applied to a surface having a conversion coating deposited thereon, to improve the qualities of the coating.

Method for coating the inner surface of metal pipes

Abstract: A method for coating the inner surface of a metal pipe having an inner diameter of about 1 to 15 cm, which comprises feeding from one end of said metal pipe dry particles of a coating composition into the interior of the metal pipe preheated at a temperature of from a softening point of said coating composition to below a melting point thereof, sucking air at the same time from the other end of the metal pipe so as to form an air stream carrying the particles and flowing in the interior of the pipe at a flow rate of about 4 to 20 m/sec and to allow the particles to deposit on the inner surface of the pipe, and fusing the deposited particles at a reduced pressure of 10 to about 100 mm Hg to form a continuous film on the inner surface of the pipe.

Radiation curable resistant coatings and their preparation

Abstract: A prepolymer containing unsaturated hydrocarbon groups is prepared and mixed on a roller mill with one or more acrylic ester monomers and various additives to make a coating formulation of a desired viscosity. In general, low viscosity formulations are used for overprint varnishes, on paper or foil, or, with pigments, for certain types of printing inks. Higher viscosity formulations are used to apply thick films on panels, tiles or other bodies. Thin films are cured to hardness by brief exposure to ultraviolet light. Thicker films require more energetic radiation such as plasma arc and electron beam radiation. The prepolymers particularly useful for making such radiation curable coatings are the reaction products of polyether polyols and bis- or polyisocyanates and hydroxy alkenes or acrylic (or methacrylic) hydroxy esters, and, likewise, reactive polyamides modified with dicarboxy alkenes, their anhydrides or esters. A small amount of wax incorporated in the coating formulations results in coatings with release characteristics similar to those of PTFE coatings.

Coating for metal surfaces and method for application

Abstract: A coating is disclosed herein together with a method of forming that coating on metal surfaces of an internal combustion chamber. The coating is deposited for example, on the combustion surface of a piston to form a thermal barrier and thus enable higher temperatures to be sustained within the chamber. Combustion at higher temperatures achieves a more complete fuel burning thus increasing performance and reducing emissions. The coating is formed on the combustion surface by successively depositing layers of different materials preferably applied utilizing a plasma flame spray process. More particularly, the formation of the coating on the combustion surface involves preparing the surface as by grit blasting and then initially depositing a thin (approximately 0.001 - 0.003 inches) nickel aluminum alloy layer. Thereafter, a second thicker layer (approximately 0.003 - 0.006 inches) comprised primarily of said nickel aluminum alloy and refractory zirconium oxide is deposited followed by the deposition of a still thicker layer (approximately 0.008 - 0.010 inches) primarily of zirconium oxide.

Role of coating defects in laser‐induced damage to dielectric thin films

Abstract: The laser‐induced damage thresholds of two different dielectric thin‐film coatings increased with decreasing spot size and were invariant for spot sizes greater than 150 μm. A simple model has been suggested that the distribution and nature of coating defects have played an important role in this spot‐size dependence, e.g., the probability of the laser beam striking a defect site will be greater for larger spot sizes and that damage in materials can be distinguished as defect damage and intrinsic damage.

Method for coating a substrate to provide a titanium or zirconium nitride or carbide deposit having a hardness gradient which increases outwardly from the substrate

Abstract: A method for coating a substrate with titanium nitride or titanium carbide or zirconium nitride or zirconium carbide is described wherein physical vapor deposition in a vacuum is used, and wherein the substrate is biased by an electrical potential and the composition of the deposit is changed by introducing a gas during the deposition to produce a hardness gradient in the deposit which increases outwardly from the substrate.

Process of applying and curing a plurality of coatings

Abstract: A topcoat is applied over a coating which has been gelled by actinic light and which is curable by ionizing irradiation. The gelled coating and the topcoat are exposed to ionizing irradiation to cure the gelled coating. It is preferred that the topcoat as applied be curable by ionizing irradiation so that it will also be cured during exposure to ionizing irradiation.

Acoustical damping structure and method of preparation

Abstract: A three-layer composite acoustical damping coating of elastomer base materials, in which the temperature and frequency at which the maximum damping occurs in the damping layer can be adjustable by integrating proper matrix materials and properties within the elastomer. A primer coating, e.g. a silicone primer, is first applied to the surface of a structure to form a bonding base for two succeeding acoustical coatings. To inhibit the transmission of sound into and through the structure a second absorber coat of filled matrix elastomer, e.g. a silicone containing tungsten particles, is applied to the bonding base coat. Such second coat is followed by a third coat having a suitable polymer matrix, such as a polyurethane or an epoxy, which may be unfilled or filled, e.g. with siliceous particles, in such a degree as to be acoustically impedance matched to the velocity of the incoming sound waves and density of surrounding medium whereby sound reflection is obviated. The composite coating therefore behaves as an acoustical attenuator to prevent surface reflection of sound.

Process for plasma flame spray coating in a sub-atmospheric pressure environment

Abstract: The invention relates to the production of plasma-sprayed coatings at low surface speeds and long stand off distances e.g. more than 7.5 cm. A zone of sub-atmospheric pressure is maintained through which the hot gas effluent and entrained coating powder produced by a plasma torch is caused to pass on its way to the substrate being coated. The sub-atmospheric zone preferably extends over the whole path of hot gas effluent and entrained coating powder. Apparatus is provided which comprises a plasma torch and a chamber preferably a tube together with means for maintaining a zone of sub-atmospheric pressure in the chamber. In the case of the tube this may be a spiral passage mounted in said tube which injects a sheath of gas moving along the inner surface of the tube in a spiral path.

Process for coating pigment particles with organic polymers

Abstract: Dispersed solid particles of titanium dioxide pigment in water containing a dispersing agent are treated with an anchoring agent which is adsorbed on the pigment surface and is capable of copolymerization with other vinyl monomers. The desired monomer or mixture of monomers is added with a polymerization catalyst and heated to effect polymerization. Among the monomers employed are the acrylates, methacrylates, styrene, acrylonitrile, and vinyl sulfonate. The process provides for the coating of individual pigment particles without the undesirable coating of pigment agglomerates. Pigments coated by the process exhibit good dispersion and wetting properties when incorporated in vehicles such as paints and plastics.

High solids, water thinnable compositions

Abstract: High solids, aqueous solvent-thinnable compositions are prepared by combining relatively low molecular weight, hydroxyl-containing organic materials with aminoplast resins. In general, the hydroxyl-containing materials are characterized by a room temperature water thinnability of 3 or more parts of water per 100 parts of organic material. The compositions can be used in a wide variety of different applications, and find particular utility in the formulation of unique coating compositions.

Reflective foil and process

Abstract: Reflective surfaces are imparted to molded objects by use of improved foils. A preferred structure comprises a substrate, a metal layer, and a protective film or coating over the metal layer. The substrate layer is preferably a film of material which is identical with or compatible to the substance used to mold the article or ware. The protective film is preferably a heat and scuff resistant material such as a 25 to 150 gauge polyester film. The metal layer, or metal surface is preferably a vacuum metallized surface and may be deposited either upon the substrate film or upon the protective film.

Semiconductor mounting devices made by soldering flat surfaces to each other

Abstract: A flat surface of a semiconductor chip is soldered to a relatively larger flat surface of a heat sink by forming a plurality of closely spaced grooves in the flat surface of the heat sink, coating the flat surfaces of the chip and the heat sink with nickel, disposing solder between the coated surfaces of the chip and the heat sink, and heating the surfaces until the solder melts. The grooves in the heat sink prevent the entrapment of gas bubbles between the chip and the heat sink, thereby providing good thermal conductivity and a relatively low electrical resistance between the chip and the heat sink.

Low-loss, highly reflective multilayer coating system formed of alternate highly refractive and low-refractive oxide layers

Abstract: A low-loss, highly reflective multilayer system for coating a substrate comprises alternate layers of high refraction and low-refraction oxide layers whose low-refraction layers comprise a low-absorption oxide of silicon and whose high refraction layers comprise titanium oxide, and wherein at least the three last high refraction layers located on the side of the system which is opposite to the substrate side comprises zirconium oxide.

Method of applying an anti-reflective coating to a solar cell

Abstract: A method of applying an anti-reflective coating, particularly a metal oxide coating to a solar cell during the manufacture of such cell

Data bearing card having an aesthetic, magnetizable, colorless, transparent coating thereon

Abstract: A data bearing card having a magnetizable, transparent, colorless coating thereon is disclosed. The coating can comprise a transparent, colorless plastic matrix containing a dispersed particulate crystalline phase. The dispersed phase is prepared by mixing 20-60% of a rare earth compound containing a colorless ferromagnetic atom such as gadolinium with 0.1-5% of titanium dioxide or zirconium oxide, 0.05-2.5% of an inorganic fluoride salt and the balance up to 100% of a glass forming matrix such as inorganic borates. The mixture is heated above its melting point to form a homogeneous melt and subsequently crystallized. The resulting crystalline product can be ground to any desired particle size for dispersion in the transparent plastic matrix. In general, the coating composition is useful in all applications where magnetic coatings are presently used. A distinct advantage is its colorless, transparent appearance which extends the range of uses to those applications where it is necessary and/or desirable to have a magnetic coating which is aesthetically pleasing or which is transparent. It is particularly important to form magnetic stripes on data cards such as credit cards, key cards for obtaining access to vending machines and restricted areas, bank checks, inventory control tags, etc. without the concomitant disadvantage of dark coloring, such as the unsightly dark brown associated with iron oxide.

Method for coating particulate material thereof

Abstract: A Method of coating particulate materials (such as silica sand, glass beads, seeds and metal particles) with a liquid thermosetting epoxy resin which comprises agitating the epoxy resin with the particles in a nonpolar liquid, which is immiscible with the epoxy resin, and contains a nonionic surfactant having a molecular weight of at least 2,000 to retard the tendency of the epoxy coated particles to agglomerate during curing of the resin in the non-polar liquid. A suitable liquid for use as the immiscible liquid is a paraffinic oil which is aromatic-free and olefin-free.