Abstract: The seat of a suction valve of a reciprocating compressor is modified to limit the area in which an annular oil film can be established between the valve and the valve seat. The seat is configured to limit the oil film from 3% to 33% of the total inlet port opening. In a modified embodiment gas at discharge pressure exerts an opening bias to the suction valve at the end of the discharge stroke.

Abstract: A method for disposing laser blocking material 52 on the interior of an airfoil 10, such as a rotor blade or stator vane, includes shear thinning the material. Various steps are developed which promote decreases in viscosity of the blocking material. In one detailed embodiment, the material is passed through an injection molding machine 54 to provide shear thinning.

Abstract: A fixture 56 for disposing laser blocking material 52 on the interior of an airfoil 10 is disclosed. Various construction details are developed which allow for the repetitive disposition of the laser blocking material in one airfoil after another. In one embodiment, the fixture includes a sprue plate 62 and locating block 126 which are spanwisely spaced and engage the ends 14, 18 of the airfoil.

Abstract: A repair kit for replacing an unserviceable vane assembly in a turbine engine includes a serviceable vane subassembly 120 having a serviceable airfoil 124 with a base 134 attached to the root end thereof and an opposing base 156 which is unattached to but slidably engagable with the serviceable airfoil. The opposing base is slipped over the tip end of the airfoil and slid toward the opposing base. The vane subassembly and opposing base are pivoted into position between inner and outer engine cases in place of an unserviceable vane assembly so that receptor sockets 148, 150 in the attached base engage support pins 72 extending from the inner case. An adhesive 182 is applied to the tip end of the serviceable airfoil and the opposing base is translated into its installed position near the tip end of the airfoil. Upon curing of the adhesive, the opposing base becomes attached to the airfoil. The base is secured to the outer case by studs 196 and nuts 198.

Abstract: A polymeric skin can be molded by heating a mold surface to a temperature sufficient to melt a casting material and controllably projecting particles of the casting material toward the heated mold surface. Particles of the casting material that impinge on the mold surface melt and adhere to the mold surface. The mold surface is cooled to a temperature at which the casting material solidifies to form a skin. By varying the amount or type of material projected toward the heated mold surface, the method can make multilayer skins, skins from more than one material with a graded transition between materials, multicolor skins, and skim having a controlled, nonuniform thickness.

Abstract: An aqueous slurry process for producing a diffusion aluminide protective coating in superalloy articles, particularly on internal passages in superalloy articles.Aqueous slurry containing a source of aluminum in particulate form, an inert ceramic particulate, a halide activator compound in particulate form and a viscous aqueous base dispersant is injected into the internal passage or otherwise coated on the internal surface to be protected. The coated article is heated to dry the slurry and remove the aqueous solvent base. The dried, coated article is diffusion heat treated between about 1,350.degree. F. and 2,250.degree. F. for a period of time between approximately 4 hours and 24 hours to transfer the aluminum to the surfaces of the passages and diffuse the aluminum into the substrate material to form the protective coating.

Abstract: Methods for selectively applying a diffusion aluminide coating to the surface of a metal article while keeping other article surfaces free of the coating are described. The method includes the steps of injection molding a mixture of materials onto the surfaces which are to be kept free of coating; the material comprises solid particles effective in preventing deposition of the coating onto the surfaces and a moldable amorphous thermoplastic resin; it contains no volatilizable solvents. The mixture is applied to the article surface to a thickness of about 5 millimeters. It is useful in pack diffusion as well as vapor phase diffusion aluminide coating operations.

Abstract: The present invention relates to a two-component acrylic modified polyester adhesive. Said adhesive comprising a first component having an acrylic modified polyester and about 0.1% to about 0.5% by weight of a peroxide, and a second component comprising an organometallic acid salt in a polymerizable organic monomer. In addition, a method of using said adhesive is disclosed.

Abstract: The present invention relates to a two-component acrylic modified polyester adhesive. Said adhesive comprising a first component having an acrylic modified polyester and about 0.1% to about 0.5% by weight of a peroxide, and a second component comprising an organometallic acid salt in a polymerizable organic monomer. In addition, a method of using said adhesive is disclosed.

Abstract: This invention relates to an anaerobic adhesive and method of making the same, comprising the reactive product of a glycidyl acrylate and a hydroxyl containing polyester. The reaction between the glycidyl acrylate and the polyester typically takes place in the presence of a radical inhibitor and an acid accelerator with oxygen present. The resulting adhesive is a single component, structural adhesive which will cure in an anaerobic environment.