Abstract: A metallic alloy part having a bonded coating that includes dispersed hard-material particles embedded in a metal matrix, composed of a eutectic solder whose alloy elements include at least the base metal of the metallic alloy part. The solder is formed by fusion bonding on the metallic alloy part, a precoating composed of sequential layers of the elemental components of the solder applied on the metal part or on the hard-material particles. The composition and disposition of the various layers are graduated such that the melting points of the elemental solder components increase towards the outermost layer.

Abstract: An electrodeposited composite coating comprises, as deposited, a matrix of cobalt and particles of chromium carbide, at least 50% and preferably at least 80% or 90% by weight of the particles lying within the size range of 4 .mu.m to 8 .mu.m.

Abstract: In an electroplating container in which at least one portion of an inside surface of the container is formed from a metal material serving as cathode or anode and an anode or cathode is placed in the container, a composite electroplating liquid containing metal ions and fine solid particles is introduced into a bottom portion of the container in such a manner that the introduced composite electroplating liquid spouts downward against an inside bottom surface of the container and is allowed to flow upward through a flow path formed between the anode and the cathode, and an electric current is applied between the anode and cathode so as to form a composite electroplating layer including the fine solid particles evenly distributed in a metal matrix on a surface of the cathode or anode facing the flow path.

Abstract: The present invention relates to a method and apparatus for forming abrasive surfaces on the tips of a plurality of workpieces such as the tips of gas turbine airfoil blades. The method broadly comprises the steps of providing a mechanical masking device having a plurality of openings arranged around the circumference of the device, installing an array containing a plurality of workpieces to be coated within the mechanical masking device so that portions of the workpieces including the tips thereof extend through the openings, immersing the mechanical masking device with the installed array of workpieces in a tank containing a plating bath with a matrix material and an abrasive grit material in slurry form so that the workpieces lie in a substantially horizontal plane, and applying a current through the plating bath to form the abrasive surfaces on the tips of the workpieces. The mechanical masking device protects portions of the array from the coating operation.

Abstract: A method and apparatus for increasing blade fatigue strength in a turbine engine. The blades in the turbine engine are configured so as to reduce stress at the tip of the blades during operation of the turbine engine, thus increasing blade fatigue strength. This stress reduction helps to counteract the detrimental effect of abrasive tip coatings on blade fatigue strength. In one embodiment, the tip of the blade is chamfered in order to reduce the stress on the tip of the blade. An abrasive coating is then applied to the tip of the blade to assist the blade in seating into an abradable outer air seal. In another embodiment, an abrasive coating is applied to a center portion of the tip of the blade, with the periphery of the abrasive coating being set back from the opposing surfaces of the blade.

Abstract: According to a method of manufacturing a microwave tube collector of this invention, a copper plating layer in which powder particles of a material having a secondary electron emissivity of not more than 1 are dispersed and precipitated is formed on a surface of a collector electrode. Only the copper plating layer is selectively etched for a predetermined period of time to increase the degree of exposure and the surface area of the powder particles of the material having a secondary electron emissivity of 1 or more in the copper plating layer.

Abstract: Disclosed is a method for the plating of a substrate with a composite coating bearing a metallic matrix with finely divided particulate matter dispersed therein. The plating bath is derived by the admixing of a prestabilized particulate matter composition or a precursor thereof along with the required plating chemicals. The use of a prestabilized particulate matter composition offers a convenient way of shipping treated powders devoid of liquids and thereby minimizing shipping costs and aging effects commonly associated with liquid dispersions. The use of the novel prestabilized particulate matter composition along with the plating chemistry provides results substantially the same as those observed from freshly prepared liquid dispersions and their incorporation along with the plating chemicals.

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 process for the production of structural parts or substrates with composite coatings by electrolytic or electroless deposition of a metal matrix in which the structural part or substrate surface is first coated with a mixture of a water-soluble powder of salt or acid and dispersed particles, fibers, felt, mat or woven fabric. Then the salt or the acid is melted and transformed to a water-soluble substance which fixes the particles, fibers, felt, mat or woven fabric to the surface of the structural part or substrate. The water-soluble substance is dissolved by immersing the structural part or substrate in an electrolytic or electroless deposition bath, and a metal matrix is deposited onto the structural part or substrate to incorporate the dispersed particles, fibers, felt, mat or woven fabrics in the matrix as a composite coating.

Abstract: A method is provided for preparing a diamond coating on a substrate. The method includes a first step of applying a partial diamond coating having an effective amount of void area therein to the work surface of a substrate. In a follow-up step the void area in the partial coating is filled with binder, preferably metallic binder. In a later step, diamond projecting outwardly from the binder is further grown, to generate a covering portion or a head portion extending over, and in protective relationship with, the binder or binder material. According to the present invention preferred products are also provided.

Abstract: Super-hard grinding particles are electrodeposited on a metallic grinder matrix having recessed portions defined in an outer peripheral surface thereof to thereby produce a desired grinder used for a grinding machine. The grinder matrix is disposed within a mesh-like grinding-particle holder provided in a plating tank. Further, the grinding particles are packed into the grinding-particles holder. The grinding particles held in contact with the recessed portions of the grinder matrix are bonded to the grinder matrix using a plating layer formed by electroplating. The grinder matrix is reversed upsidedown and holding the grinding particles in contact with the recessed portions of the reversed grinder matrix. The grinding particles are bonded again to the grinder matrix using a plating layer formed by electroplating.

Abstract: A metastable crystal layer is deposited by chemical plasma deposition on diamonds at subatmospheric pressure (10.sup.-3 Torr) at 850.degree.-1050.degree. C. The metastable layer enables the diamond to be metallurgically bonded to a suitable substrate.

Abstract: A dispersion plating method in which plating is conducted while plating liquid containing both abrasive grains of a size larger than 10 .mu.m and another grains is brought into contact with the surface of an object to be plated, the latter grains then being removed by washing with water with only abrasive grains being entrapped in a metal matrix. Plating liquid is circulated through a filter of a filtering size smaller than the average grain size of abrasive grains and the abrasive grains are made into a flocculating condition and adhered to the surface of object to be plated. Furthermore, abrasive grains are adhered to the surface of object to be plated in a plating thickness of less than one half of average grain size of abrasive grains.

Abstract: An improved method for plating super abrasive materials onto the working portion of a honing tool, which method includes plating or otherwise coating a relatively thin layer of a composite material comprising a metal or metal alloy material having a friction reducing or lubricating type material occluded or otherwise associated therewith over the top of the bond already established between the abrasive particles and the working portion of the honing tool so as to substantially reduce and minimize the occurrence of having stock material build-up and collect between the abrasive particles, which stock build-up causes galling or scoring of the honed work surface during a honing operation. In the preferred embodiment, the composite material comprising the anti-galling coating surface is a nickel/phosphorous alloy material having micron-sized Teflon particles occluded therein.

Abstract: A metastable crystal layer is deposited by chemical plasma deposition on diamonds at subatmospheric pressure (10.sup.-3 Torr) at 850.degree.-1050.degree. C. The metastable layer enables the diamond to be metallurgically bonded to a suitable substrate.

Abstract: A method of producing a gas turbine blade having an abrasive tip comprising producing a binding coat on the tip of the blade body by electrodeposition, the binding coat comprising MCrAlY where M is one or more of iron, nickel and cobalt, anchoring to the binding coat coarse particles of an abrasive material by composite electrodeposition of the particles and an anchoring coat from a bath of plating solution having the abrasive particles suspended therein, and then plating an infill around the abrasive particles. The anchoring coat may be of cobalt or nickel or MCrAlY as above defined and preferably has a thickness less than 30 .mu.m. The infill material may also be MCrAlY as above defined. Preferably, deposition of the infill is accompanied by vibration of the blade in a direction which is substantially vertical and substantially along the axis of the blade.