Abstract: A molybdneum, rhenium, and tungsten alloy having an improved erosion, ductility, strength and a higher recrystallization temperature. The alloy may be fabricated into equipment which is useful for manufacturing chemicals such as a hydrochlorofluorocarbon.
Abstract: A method for the cleaning of roughened surface or porous-coated medical implants of all kinds. In the cleaning method, the roughened surface or porous-coated implant is subjected to blasting with particulate solids selected from the solids that are soluble in a biocompatible non-toxic solvent and solids that deliquesce, sublimate or vaporize. The particulate solids must be sufficiently hard to provide effective impact for dislodging debris and loosely attached particles from implant surfaces. After blasting, the surface is optionally treated with ultrasonic vibration to further remove debris particulates. The impacted surfaces may also be rinsed with a biocompatible liquid. After cleaning, the surfaces may be passivated by immersion in conventional passivation solutions or a solution of non-aggressive oxyanions.
Abstract: A shape memory alloy (SMA) actuator predeformed in compression actuates a cable cutter mechanism. A cable or other item to be cut is placed between an anvil and a movable blade affixed to the SMA element. The SMA element is heated by an electrical resistance heater to cause it to return to its undeformed elongated state, thereby moving the blade against the anvil to compress and sever the cable or other item. Ones of the shape memory alloy actuator have a plurality of parallelly arranged SMA elements, every other one of which is predeformed in compression and intermediate ones of which are predeformed in tension. The elements are coupled end-to-end so that, when they are heated to cause them to return to their undeformed states, their respective elongations and shrinkages combine at the output to produce an actuation that is the cumulation in the same direction of the changes of all the elements. The plurality of elements may be in a side-by-side or concentric arrangement.
Abstract: The invention provides a magnesium manganese alloy suitable for use in the production of a pellet 10 for administration to a ruminant by dposition in its rumenoreticular sac. A typical pellet 10 comprises a magnesium alloy tube 12 enclosing a degradable core formed of plurality of tablets 14, 16. The magnesium alloy used in the construction comprises at least 90% by weight of magnesium, uyp to 1% zinc and up to 2% of manganese. Preferably the alloy may further include aluminium, silicon or zirconium along with iron and beryllium. When deposited in an animal's rumen the alloy reacts with the rumen juices to form an anodic film over the exposed surface of the tube 12. This prevents corrosion or dissolution of the tube 12 except at its exposed ends where galvanic corrosion by coupling with the electrically conductive core 14, 16 is provided. The normal requirement of a non-degradable exterior coating e.g. resin for the tube exterior is obviated.
Abstract: A method and apparatus for removing contaminants from soil by a closed-loop, counter-current extraction process is disclosed. The process involves a preliminary water removal step, followed by a counter-current leaching of the contaminants from the soil by an extraction solvent in one or more extraction vessels. The extraction solvent is preferably 2-methyl-2-propanol and is continuously recycled.
Abstract: A nickel-base alloy for a glass-contacting member used in an unenergized state and having a composition comprising by weight 25 to 40% of chromium, 10 to 45% of cobalt, optionally 0.1 to 3.0% of titanium and optionally 0.01 to 0.05% of at least one element selected from among rare earth metals with the balance consisting of nickel and unavoidable impurities.
Abstract: A nickel-base casting alloy for use in gas turbine components consists essentially of the composition (in weight percent): carbon 0.02-0.15, chromium 14-18, cobalt 8-12, aluminum 0.5-1.5, titanium 2.0-3.5, niobium 3.5-6.0, tantalum 1.0-2.0, tungsten 1.0-3.0, molybdenum 3.0-6.0, boron 0.002-0.05, zirconium 0.01-0.1, balance nickel and incidental impurities. The alloy is characterized by a volume fraction of gamma prime of about 32%, an ultimate tensile strength in the range 990-1010 MPa over the temperature range 550.degree.-750.degree. C., and a mean coefficient of linear thermal expansion in the range 11.5-15.0 alpha(*E-06/.degree.C.).
Abstract: Rust inhibiting compositions having improved elasticity properties are provided. The compositions contain oxime based rust converter compounds formulated with a latex based paint to provide a flexible film coating that acts as a barrier to oxygen and water vapor diffusion to the metal surface. Methods for applying the rust inhibiting compositions to metal surfaces are also provided.
Abstract: Single crystal nickel base superalloys, having low chromium and cobalt contents are described. The alloys have a unique combination of aluminum, tantalum, and rhenium, which results in surprisingly good oxidation and corrosion resistance, and a melting point in excess of 2500.degree. F. The properties of the alloys of the present invention make them suitable for use as components in the high temperature section of gas turbine engines.
Abstract: This invention relates to high silicon, aluminum base, casting alloys having high strength in the as-cast and room temperature aged condition. The alloys of the preferred composition ranges are similar to the F-132 permanent mold, aluminum piston alloy, containing 9.5% silicon, 3.0% Cu, and 1.0% Mg, except that the Mg has been increased to about 3.0%, and Zn has been added to about 5.5%.The addition of the Mg and Zn results in their room temperature aging characteristics, to Brinell hardnesses of between 95 and 120. These hardnesses are comparable to those of the F132 alloy, 100 to 110 BHN, when heat treated at 400 F for from 7 to 9 hours. In addition, the alloys of the invention exhibit a minimum of growth during the hardening cycle, whereas the presently used high silicon alloys exhibit growth rates of 0.001" per inch, and greater, during their heat treatment cycles.