Sandia National Laboratories

Sandia Corporation

Steven Howard Goods

Leroy L Whinnery, Jr

Charles Henry Cadden

David R Wheeler

Timothy J Shepodd

Paul Michael Dentinger

Dawn M Skala

George M Buffleben

Patrick N Keifer

James John Kelly

Craig C Henderson

Vincent C Prantil

Nancy Yuan-Chi Yang

Disclosed is a method for making a polyurethane closed-cell foam material exhibiting a bulk density below 4 lbs/ftand high strength. The present embodiment uses the reaction product of a modified MDI and a sucrose/glycerine based polyether polyol resin wherein a small measured quantity of the polyol resin is 'pre-reacted' with a larger quantity of the isocyanate in a defined ratio such that when the necessary remaining quantity of the polyol resin is added to the 'pre-reacted' resin together with a tertiary amine catalyst and water as a blowing agent, the polymerization proceeds slowly enough to provide a stable foam body.

Method for providing a low density high strength polyurethane foam

A process for electrodepositing a low stress nickel-manganese multilayer alloy on an electrically conductive substrate is provided. The process includes the steps of immersing the substrate in an electrodeposition solution containing a nickel salt and a manganese salt and repeatedly passing an electric current through an immersed surface of the substrate. The electric current is alternately pulsed for predetermined durations between a first electrical current that is effective to electrodeposit nickel and a second electrical current that is effective to electrodeposit nickel and manganese. A multilayered alloy having adjacent layers of nickel and a nickel-manganese alloy on the immersed surface of the substrate is thereby produced. The resulting multilayered alloy exhibits low internal stress, high strength and ductility, and high strength retention upon exposure to heat.

Process for the electrodeposition of low stress nickel-manganese alloys

A system for joining a pair of structural members having widely differing coefficients of thermal expansion is disclosed. A mechanically &ldquo;thick&rdquo; foil is made by dispersing a refractory metal powder, such as molybdenum, niobium, tantalum, or tungsten into a quantity of a liquid, high expansion metal such as copper, silver, or gold, casting an ingot of the mixture, and then cutting sections of the ingot about 1 mm thick to provide the foil member. These foil members are shaped, and assembled between surfaces of structural members for joining, together with a layer of a braze alloy on either side of the foil member capable of wetting both the surfaces of the structural members and the foil. The assembled body is then heated to melt the braze alloy and join the assembled structure. The foil member subsequently absorbs the mechanical strain generated by the differential contraction of the cooling members that results from the difference in the coefficients of thermal expansion of the members.

Braze system and method for reducing strain in a braze joint

There is provided a light emitting device comprising a plurality of triboluminescent particles dispersed throughout a low density, frangible body and activated by rapidly crushing the body in order to transfer mechanical energy to some portion of the particles. The light emitted by these mechanically excited particles is collected and directed into a light conduit and transmitted to a detector/indicator means.

Triboluminescent indicator system

Thionyl chloride is a hazardous and reactive chemical used as the liquid cathode in commercial primary batteries. Contrary to previous thinking, ASZM-TEDA&reg; carbon (Calgon Corporation) reversibly absorbs thionyl chloride. Thus, several candidate materials were examined as irreversible getters for thionyl chloride. The capacity, rate and effect of temperature were also explored. A wide variety of likely materials were investigated through screening experiments focusing on the degree of heat generated by the reaction as well as the material absorption capacity and irreversibility, in order to help narrow the group of possible getter choices. More thorough, quantitative measurements were performed on promising materials. The best performing getter was a mixture of ZnO and ASZM-TEDA&reg; carbon. In this example, the ZnO reacts with thionyl chloride to form ZnCl and SO . The SO is then irreversibly gettered by ASZM-TEDA&reg; carbon. This combination of ZnO and carbon has a high capacity, is irreversible and functions effectively above &minus;20&deg; C.

Absorption media for irreversibly gettering thionyl chloride

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Livermore, CA, United States of America

Steven Howard Goods