Abstract: A rivet setting apparatus having a first driver with a rivet deforming piece and an opposite second driver with a rivet deforming piece. One of the rivet deforming pieces has an outer housing with a deforming seat in its front end and an aperture into the deforming seat. Located in the aperture is a movable ram that can extend into the deforming seat. The ram and outer housing are movable at different rates and distances from home positions to deform a rivet.

Abstract: A method of repairing damages in a superalloy component is disclosed wherein existing brazed joints and protective coatings are not harmed. The method entails the use of a silicon-free metal mixture comprising (i) a low melting alloy having a liquidus below the temperature to be used to deposit the metal mixture, (ii) an alloy melting above about 2100.degree. F., and (iii) optionally nickel. The resultant repair has a solidus temperature of at least 1950.degree. F., preferably at least 2000.degree..

Abstract: The invention relates to a surface treatment for silicon carbide filaments. A carbon-rich silicon carbide layer or coating is formed over the silicon carbide surface. The ratio of silicon to carbon in the carbon-rich silicon carbide layer varies from 1 (stoichiometric) at the silicon carbide filament interface to about 0.43 (70% carbon, 30% silicon) at the exterior surface of the carbon-rich layer. A preferred method of making the carbon-rich silicon carbide layer is also presented.

Abstract: An integrated emergency lubrication system for lubricating the bearings of a gas turbine engine in the event that the normal lubrication system for the engine fails for any reason. The emergency system includes an accumulator for storing oil, derived from the normal lubrication system, that is released in a controlled manner, mixed with air and supplied, as a mist to lubricate the engine's bearings for several minutes after the normal lubrication system fails. Energy for operating the emergency lubrication system is derived from high pressure compressed air admitted from the compressor section of the engine when the oil pressure of the normal lubrication falls, a portion of the compressed air being pressure-regulated and combined with oil from the accumulator to form an air/oil mist that is sprayed over the bearings to be lubricated.

Abstract: A heat exchange module for use with a plurality of similar modules to form a recuperator for use in an gas turbine engine. The module has a center section with a generally rectangular cross-sectional shape, a first side section with a generally triangular cross-sectional shape, and a second side section. The module can be combined with other modules to form a polygonal recuperator with a center aperture.

Abstract: A method is described for assuring concentricity of a gear's pitch circle with its axis, the pitch circle having a non-constant radius about the axis. The method comprises the steps of: determining the gear's pitch circle and its position of maximum radial offset from the gears axis; positioning the gear in a chuck having a plurality of simultaneously movable jaws, the chuck having an axis which is continually concentric with respect to its jaws as they move, the position of maximum radial offset being positioned adjacent a chuck jaw so that when the jaws are moved to grip the gear, the axis of the gear is offset from the chuck axis by action of the jaws on the gear; placing the chuck and gripped gear in a machine tool adapted to machine the gear concentrically with the chuck's axis; and operating the machine tool to remove sufficient material from the gripped gear to bring the gear's axis into concentricity with the gear's pitch circle.

Abstract: The invention relates to means and method of making a multiple castable structural panel in a single pouring operation. A mold-envelope constructed from a plurality of pieces is provided. The mold-envelope is constructed without any external fastening means. The poured core holds the pieces of the mold-envelope together.

Abstract: A system of mounting segmented liner panels on the interior of an outer shell of a combustion chamber for a gas turbine engine. The system is effective to enable higher temperatures to be maintained thereby increasing engine efficiency while simultaneously guarding against structural failure. A plurality of concentrically disposed segmented liner panels are arranged in side by side circumferential relationship at successive axial locations. Each liner panel is fixed relative to the outer shell at one location proximate to a leading portion. In addition, each liner panel is restrained against radial movement relative to the outer shell, but relative axial and circumferential movement between the liner panel and outer shell is permitted. Mating spacer hooks and spring clip members are selectively engageable to mount a trailing portion of each liner panel to the outer shell. Lateral edges of adjacent liner panels are mutually configured to prevent escape of heat while accommodating circumferential expansion.

Abstract: Erosion resistance is imparted to a metallic substrate without an attendant loss of fatigue life in the substrate by applying to the substrate a first layer comprising palladium, platinum or nickel in direct contact with the substrate and then applying a second layer which overcoats the first layer, the second layer being comprises of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases therein. In another embodiment erosion resistance is imparted by employing a coating which comprises a first ductile layer on the substrate of palladium, platinum or nickel; a second layer comprising substantially pure tungsten; and a third layer comprising a material formed of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases.

Abstract: Erosion resistance is imparted to a metallic substrate without an attendant loss of fatigue life in the substrate in one embodiment by applying to the substrate a first ductile layer comprising a metal from Group VI to Group VIII elements as well as the noble metal group of elements, and a second hard erosion-resistant layer applied on the first layer comprising a boride, carbide, nitride or oxide of a metal selected from Group III to Group VI elements, the first layer capable of retaining substrate integrity and preventing diffusion of material from the second layer into the substrate. Another embodiment defines another layer of a substantially pure metal from Group III to Group VI between the first and second layers. Still another embodiment defines that in the second layer the content of either the carbide, nitride, boride or oxide is graded, i.e.

Abstract: A welding head 10 for coupling a welding electrode 12 to a source of electrical current. The welding head includes a housing 30 and an electrically conductive shaft 18 rotatably mounted with the housing. The shaft has a substantially circular cylindrical shape having a first end surface for mounting a welding electrode thereto and a second, substantially flat, opposing end surface 20. The welding head further includes an electrical coupler in contact with the second substantially flat end surface of the shaft for coupling electrical current into the shaft. The electrical coupler includes an electrical conductor having a first end coupled to a source of welding power and an electrically conductive contact plate 22 having a substantially flat surface in contact with the second substantially flat end surface of the shaft.

Abstract: A turbo fan gas turbine engine is disclosed which includes a central engine and a shroud-enclosed fan, the shroud being supported by a plurality of structural struts extending from the central engine to the shroud. A plurality of tubes internal to each strut are provided with fins to increase their effective internal surface areas. Means are provided for connecting the tubes to a source of heated hydrocarbon liquid and for providing a return from the tubes to the source of hydrocarbon liquid, whereby the tubes provide cooling for the liquid. In a preferred embodiment of the invention, the tubes are surrounded by a highly conductive cement to provide support and improved heat transfer between the tubes and the struts.

Abstract: A silicon-free metal powder mixture suitable for filling holes, slots and widegap joints in high temperature superalloys and/or for reforming damaged or missing surface extensions thereof, and capable of being processed at a temperature of about 2000.degree. F. The semi-solid metal mixture has a sufficiently high surface tension and viscosity to be essentially non-flowing at the processing temperature so that it retains its applied shape and location without flowing during processing. The metal mixture after processing has a solidus temperature of at least 1950.degree. F.

Abstract: A system for cooling a turbine assembly in a gas turbine engine. The system has a bleed means for bleeding a portion of a first core of gas exited from a compressor section of the engine to thereby form a second core of gas. The second core of gas is additionally pressurized by a second compressor means to increase the pressure of the second core of gas. The second core of gas is then delivered to the turbine section for cooling of the engine such that the second core of coolant gas has a higher pressure than the first core of gas exiting the combustor section.

Abstract: A universal torque measuring system for hollow drive shafts which automatically compensates for variations in wall thickness exhibited by different drive shafts having the same nominal dimensions. During a calibration procedure, the drive shaft is subjected to a first predetermined torque which causes a certain amount of twist dependent upon its wall thickness. At this time, target indicia are positioned and affixed to the drive shaft to produce an initial phase shift relative to indicia on a reference shaft. Thereafter, when the drive shaft is incorporated into an engine and rotated under load subjecting it to a second predetermined torque less than the first predetermined torque, there is a resulting second phase shift. This second phase shift and the second predetermined torque define a second operating condition of the drive shaft. In turn, the first and second operating conditions define a characteristic relationship between torque and phase shift for the drive shaft.

Abstract: A high strength silicon carbide monofilament which has a core and a stoichiometric bulk layer of silicon carbide deposited on the core having an exterior surface and a core bulk layer interface, the bulk layer having an average grain size of less than 200 nanometers which size varies continuously across the cross section of the bulk layer, the variation comprising a first average grain size at the interface which increases to a maximum average grain size intermediate the interface and the exterior surface and then decreases to the minimum at the exterior surface. In an alternate embodiment a surface layer is deposited on the bulk layer of silicon carbide. A preferred method of making the silicon carbide monofilament is also presented.

Abstract: Disclosed are novel nickel base single crystal alloy compositions consisting essentially of, by weight, about 8.0-14.0% chromium, 1.5-6.0% cobalt, 0.5-2.0% molybdenum, 3.0-10% tungsten, 2.5-7.0% titanium, 2.5-7.0% aluminum, 3.0-6.0% tantalum, about 0.005% to about 1.0% each of hafnium and/or silicon, optional minor amounts of yttrium, lanthanum and/or manganese, and the balance nickel.Methods of thermal treatment and coating of the novel alloys to enhance their mechanical properties are also disclosed, as are articles produced by such methods.

Abstract: A flow fence for a turbo fan jet engine, as taught by Stein et al. in U.S. Pat. No. 3,841,790, is modified by the provision of serrations about its internal circumference. Thus, when the modified flow fence is inserted into or removed from the flow field, a more gradual transition occurs in the flow thereby improving surge margins.

Abstract: A transducer for measuring vibrations is formed of a case with a vibratory element mounted therein by means of a disk spring which is constrained to vibrate with the vibratory element in a single direction. Optical or magnetic sensors are located in registration with opposed ends of the vibratory element to produce optically or magnetically induced signals having a modulation thereon resulting from vibration of the vibratory element. The use of pairs of the sensors improves signal-to-noise ratio while allowing for increased bandwidth of the transducer in the measurement of vibration.

Abstract: The invention deals with an oxidation protection system for an inhibited carbon substrate which comprises a friable layer applied to the carbon substrate surface. The friable layer is then coated with a dense oxidation resistant outer layer.