Showing papers on "Coating published in 1976"

Thermal barrier coating system

Abstract: This invention relates to a high temperature oxidation resistant thermal barrier coating system for a nickel-, cobalt-, or iron-base alloy substrate. An inner metal bond coating contacts the substrate, and a thermal barrier coating covers the bond coating. NiCrAlR, FeCrAlR, and CoCrAlR alloys have been satisfactory as bond coating compositions where R=Y or Yb. These alloys contain, by weight, 24.9-36.7% chromium, 5.4-18.5% aluminum, and 0.05 to 1.55% yttrium or 0.05 to 0.53% ytterbium. The coatings containing ytterbium are preferred over those containing yttrium. An outer thermal barrier coating of partially stabilized zirconium oxide (zirconia) which is between 6% and 8%, by weight, of yttrium oxide (yttria) covers the bond coating. Partial stabilization provides a material with superior durability. Partially stabilized zirconia consists of mixtures of cubic, tetragonal, and monoclinic phases.

Process for putting a hydrophilic coating on a hydrophobic contact lens

Abstract: The surface of a contact lens is modified by deposition of an ultrathin coating of a hydrophilic polymer under the influence of plasma glow discharge so as to integrally bond the coating to the surface of the hydrophobic lens thereby effecting a hydrophilic lens.

Progress in the Development of Graphite- Aluminum Composites Using Liquid Infiltration Technology:

Abstract: The most successful techniques for producing graphite-aluminum com posites have been those that utilize liquid-metal infiltration of graphite yarn. Almost all grades and types of graphite yarn can be infiltrated; how ever, a fiber coating is required, which results in wetting and provides a diffusion barrier to inhibit aluminum carbide formation. Two fiber coating methods are discussed in detail, including the sodium pretreatment method that results in intermetallic compound formation on the fiber and a chem ical vapor deposition method that applies a titanium-boron codeposit.

Patient and specimen identification means and system employing same

Abstract: An element suitable for attachment to a hospital wristband or patient specimen container such as test tubes or the like is disclosed which element has a coating of magnetizable material that is encoded along a circular track with patient identification and other desired information relating to the patient and the system employing such elements. The element is used to associate positively a patient with a specimen taken from him, or with medicine or treatment to be given him.

Solar absorptance and emittance properties of several solar coatings

Abstract: Solar absorptance αs and total hemispherical emittance et,H properties of two potential solar selective coating systems are reported. The first coating system studied is a semiconductor‐pigmented paint which consists of a high‐temperature silicone binder mixed with small particles of Ge, Si, or PbS. Although most of the paints have αs values above 0.90, all the paints suffer from high et,H values (∠0.70 to 0.90), which are shown to be due to the high emittance of the silicone binder itself. The second system studied is electroplated films of ’’black nickel’’ and a proprietary ’’black chrome.’’ Both αs and et,H values have been obtained as a function of the electroplating time and the substrate surface roughness. Increasing the plating time initially increases both αs and et,H; however, for long plating times, there is no improvement in αs, while et,H continues to increase. By increasing the surface roughness of nickel‐plated substrates, the solar absorptance can be increased while maintaining approximatel...

Fluorometric system, method and test article

Abstract: A fluorometric system to determine the kind and amount of substances derived from a biological fluid (eg, serum or urine) or tissue in which the substances to be detected (eg, antigen, antibody, hormone or enzyme) are coated onto a substrate surface in fluorescent form Multiple coating areas of different samples may be employed The fluorometric system includes a source of filtered light to excite fluorescence, optical systems for conducting the excitation light to such coating, and optical systems for receiving emitted fluorescence and for detecting the same The system efficiency and optical characteristics disclosed avoid photo-bleaching; limit fading; and are especially adapted to provide accurate surface reading fluorometry

Implants for bones, joints and tooth roots

Abstract: An improved implant for a bone, a joint and tooth root comprising a metallic base material and a coating layer of hydroxyapatite which is formed by thermally sprayed hydroxyapatite powder or a mixture of hydroxyapatite powder and ceramic powder around the outer surface of the metallic base material, optionally a layer of a bonding agent and further a layer of ceramics are formed between the metallic base material and the layer of hydroxyapatite. The implant has a sufficient mechanical strength (e.g. impact strength) and further a good affinity to tissues of living bodies and is useful for implantation in various bones including tooth roots in living bodies.

Electrically conductive transparent laminated window

Abstract: An optically clear, electrically conductive, transparent coating on a substrate and a method of coating are disclosed. The coating comprises a first transparent layer deposited as TiO x on the substrate, where x preferably has a value within the range of 1.3 to 1.7, a layer of silver or gold deposited on the first layer, and a third transparent layer deposited as TiO x on the second layer, where x preferably has a value within the range of 1.3 to 1.7. The coating is deposited under vacuum in a partial pressure of oxygen on a rigid transparent substrate such as glass or a flexible plastic substrate and the resultant coated substrate used in electrically heated windows.

Mold coating of freshly molded articles

Abstract: A method of compression molding a special purpose coating or skin onto the surface of a freshly molded polymeric substrate, including the steps of: injecting a skin-forming material between the surface to be coated and the die forming that surface such that the substrate is hydraulically immobilized within the mold cavity during separation of the die from the substrate surface, and thereafter compression molding the skin-forming material over the surface.

The Effect of Chromium Oxide Coatings on Surface Flashover of Alumina Spacers in Vacuum

Abstract: An experimental investigation of the effect of chromium oxide coatings upon the surface flashover of high-density alumina in vacuum is reported. It is shown that such coatings improve the withstand voltage for dc, 60-Hz, and impulse voltages by significant amounts. The coatings are simply applied, effective, and durable. It is postulated that the improvement in insulation is due to the elimination of positive surface charging by the use of a coating with a secondary-electron emission coefficient less than unity for all incident electron energies.

The Electrical Properties of Protective Polymer Coatings as Related to Corrosion of the Substrate

Abstract: The effective electrical permittivity of polymer‐coated steel was measured between 200 Hz and 100 kHz as a function of time of exposure to . The real and imaginary parts of the permittivity increased over the entire frequency range as a consequence of electrolyte penetration. The development of a −1 slope on the log loss vs. log frequency curve suggested localized penetration of the dielectric coating by a conducting phase. This behavior correlated with the onset of visible localized corrosion. Results were discussed in terms of a metal/metal oxide/penetrated‐coating model.

Cathode structure for a multibeam cathode ray tube

Abstract: A flat cathode ray tube device is provided for display of information by response to an electron beam of a phosphor coating on a face plate. A monolithic structure includes an x-y matrix of electron source cathodes and a pair of grid arrays successively spaced from the matrix with holes therethrough adjacent to and aligned with the cathodes selectively to form and individually control the intensity of an electron beam from each of said cathodes. Deflection control structure has holes through which the beams may pass with a set of x-y deflection electrodes associated with each of the holes for x-y control of the trajectory of each of the beams. A support plate forms the base of the monolithic structure with the cathodes mounted thereon and a face plate structure marginally sealed to the support plate provides a vacuum tight envelope housing the monolithic structure.

Process for forming multi-layer coatings

Abstract: The present invention relates to a process for forming a multi-layer coating including at least two coating layers by performing the oven drying step at one time, which comprises coating at least partially the surface of the substrate with a powder coating composition, then applying a slurry paint composition comprising synthetic resin particles dispersed in an aqueous medium and then heating.

Poly-para-xylelene: its chemistry and application in coating technology.

Abstract: The chemistry of p-xylelene and of its analogues has been reviewed. Its modes of formation and polymerization to poly-p-xylelene have been described, and the initiation and hypothetical termination steps have been discussed. The reactions taking place in the gas phase and in the deposited film are contrasted with those taking place in solutions. The problems of crystallization of the polymer simultaneously proceeding with its growth have been stressed. Finally, the properties of poly-p-xylelenes and their application in the coating industry have been described in some detail, emphasizing the special advantages of gas-deposition leading directly to a solid and coherent film. Some future fields of application of this technique have been outlined.

The Mechanism of Corrosion of Poly butadiene-Coated Steel in Aerated Sodium Chloride

Abstract: Polybutadiene-coated steel exhibits highly localized corrosion sites that spread with time. Delamination of the coating occurs in the cathodic areas immediately adjacent to the anodic corrosion sites. Data obtained from electrical measurements, corrosion potentials, and literature sources were used to arrive at an overall mechanism of corrosion.

Process for producing a well-adhered durable optical coating on an optical plastic substrate

Abstract: A process for coating an optical plastic substrate, for example polymethylmethacrylate (PPMA), with a single layer coating for the purpose of improving the durability of the plastic, the coating being deposited by a low temperature plasma polymerization process.

Deposition of transparent amorphous carbon films

Abstract: Applying a D. C. glow discharge to a heated glassy substrate in an evacuated chamber to which a volatile hydrocarbon has been added, produces a glassy substrate coated with a hard, transparent, resistive, amorphous carbon coating.

Polycrystalline diamond member and method of preparing same

Abstract: A method of preparing a polycrystalline diamond member comprising sintering diamond particles having deposited thereon, not only diamond coating, but also diamond-graphite coating In the epitaxial method of coating according to the invention, diamond particles may be the finest ones of a size smaller than one micron. The resulting compact member is characterized in the absence of marked graphite inclusions, and diamond cleavage between the particles results in a considerable improvement of the strength of the compact member.

Coating aluminum with a strippable copper deposit

Abstract: of the Disclosure An improvement in providing a mechanically strippable copper plate on an aluminum carrier is achieved by pretreating the aluminum carrier with an alkaline, aqueous, alkali metal zincate composition containing a small amount of` one or more water soluble iron, cobalt or nickel salts, and removing sub-stantially all of the deposited zincate coating with acid prior to copper plating.

Coated superalloy article

Abstract: A protective coating is provided on gas turbine engine type superalloys comprising an interlayer adjacent the superalloy substrate a principal protective element of which comprises an aluminide of the basis metal of the substrate formed by the reaction of aluminum at high temperature with the substrate, and an overlayer comprising an MCrAlY-type coating where M is selected from the group consisting of cobalt, nickel and iron

Duplex coating for thermal and corrosion protection

Abstract: A duplex coating and method for making same wherein a primary layer of metals or metal alloys is deposited on a superalloy substrate to seal the substrate against oxidation. A second layer of low density oxide is deposited on the surface of the primary layer. The primary layer has a rough surface so as to provide an adherent surface for the oxide layer.

Radiation curable coating

Abstract: A radiation curable coating composition for various substrates contains an adduct of acrylic acid and an epoxy resin (which may be modified with an anhydride, such as maleic anhydride), and a reactive acrylate monomer vehicle. The coating composition can be pigmented and can also contain additives commonly used in coatings, such as wetting agents and flow control agents. The coating composition does not require the usual hydrocarbon vehicles that give rise to air pollution problems. Surface gloss of a UV cured film obtained from a pigmented coating composition can be increased by using a photosensitizer combination of 2-chlorothioxanthone and a phenylketone, such as benzophenone. Adhesion of a cured coating is improved by replacing the tertiary amine co-sensitizer, at least in part, with dimethylaminoethyl acrylate.

An analytical description of the jet finishing process for hot-dip metallic coatings on strip

Abstract: An analytical study of the jet finishing of hot-dip metallic coated strip which relates the final solidified coating thickness to strip speed, jet nozzle operating parameters, and coating metal and finishing fluid properties is described. The results of laboratory and mill tests are compared with the predictions of the analytical model and engineering considerations for jet nozzle operation to reduce coating weight at increased line speed are discussed.

Method of multi-layer coating

Abstract: The simultaneous high speed application of a plurality of liquid coating compositions to a moving web by the method of multi-layer bead coating is improved by coating the lowermost layer as a thin layer formed from a low viscosity coating composition and coating the layer immediately above the lowermost layer as a thicker layer of higher viscosity such that vortical action of the coating bead is confined to the lowermost layer and the layer immediately above it. By this means, intermixing of the coating composition forming the lowermost layer with the coating composition forming the layer immediately above it occurs, but all other layers are coated in discrete form. The method is especially useful in the manufacture of multi-layer photographic films and papers.

High temperature wear resistant coating composition

Abstract: A coating composition for producing high temperature, wear-resistant coatings on a metallic substrate, such as a nickel, cobalt, or iron base alloy, consisting of a cobalt base alloy with chromium, tantalum and carbon additions thereto. The basic composition may also contain one or more of aluminum, yttrium or the rare earth metals, silicon, manganese, or a dispersion of a metal oxide, such as alumina (Al 2 O 3 ).