107,578 research outputs found

    Coiled sheet metal strip opens into tubular configuration

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    Copper alloy is converted into a spring material that can be rolled into a compact coil which will spontaneously open to form a tube in the long direction of the strip. The copper alloy is passed through a furnace at a prescribed temperature while restraining the strip in the desired tubular configuration

    Adherent protective coatings plated on magnesium-lithium alloy

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    Zinc is plated on a magnesium-lithium alloy by using a modification of the standard zinc-plate immersion bath. Further protection is given the alloy by applying a light plating of copper on the zinc plating. Other metals are plated on the copper by using conventional plating baths

    Copper and nickel adherently electroplated on titanium alloy

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    Anodic treatment of titanium alloy enables electroplating of tightly adherent coatings of copper and nickel on the alloy. The alloy is treated in a solution of hydrofluoric and acetic acids, followed by the electroplating process

    Phonon-drag thermopower in cu-al and cu-si alloys

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    Phonon drag thermopower in copper-aluminum and copper-silicon alloy

    Copper-titanium eutectic alloy improves electrical and mechanical contact to silicon carbide

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    Contact preparation at low temperatures is possible with the use of a copper-titanium eutectic alloy. Contacts formed with this alloy are ohmic on p-type silicon carbide and rectifying on n-type

    High temperature, low-cycle fatigue of copper-base alloys for rocket nozzles. Part 2: Strainrange partitioning and low-cycle fatigue results at 538 deg C

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    Low-cycle fatigue tests of 1/2 Hard AMZIRC Copper and NARloy Z were performed in argon at 538 C to determine partitioned strain range versus life relationships. Strain-controlled low-cycle fatigue tests of a Zr-Cr-Mg copper-base alloy were also performed. Strain ranges, lower than those employed in previous tests, were imposed in order to extend the fatigue life curve out to approximately 400,000 cycles. An experimental copper alloy and an experimental silver alloy were also studied. Tensile tests were performed in air at room temperature and in argon at 538 C. Strain-controlled low-cycle fatigue tests were performed at 538 C in argon to define the fatigue life over the regime from 300 to 3,000 cycles. For the silver alloy, three additional heat treatments were introduced, and a limited evaluation of the short-term tensile and low-cycle fatigue behavior at 538 C was performed

    Studi Eksperimental Pengaruh Tembaga Terhadap Kuat Tarik Baja

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    Steel is a metal alloy composed of iron as main element and carbon as an element of reinforcement. Carbon element play a role in improving the quality of the steel. Combined steel to can fix the ability of tensile strength the steel. In this research, combine carbon steel with copper. Copper alloy steel expected to increase the tensile strength of the steel. In this research we use sample with the non alloy steel (TP), alloy steel with 0,5% copper alloy (FeCu-5), and alloy steel with 1,0% copper alloy (FeCu-10), testing that will do in the form of composition testing, hardness testing, and tensile testing. The steel tensile testing we get the data of stress,strain,modulus elasticity,and ductility. The result obtaine from this research is 1% copper alloy increases the ultimate tension by 42,42% compared with non alloy steel. While there is decrease in the ultimate strees by 0,5% copper alloy by 30,98% compared with non alloy steel

    Comparative Growth and Survival of Juvenile Atlantic Cod (Gadus morhua)Cultured in Copper and Nylon Net Pens

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    Bio-fouling on net pens has been a major concern for the marine aquaculture industry. As cage systems increase in size, so does the surface area for the attachment of colonial organisms that create drag on the net, reduce water flow important to fish health, and increase operational expenses due to net cleaning. To solve this problem, the International Copper Association (ICA) has been developing copper alloy netting for sea cages. Copper netting has unique properties that minimize bio-fouling, reduce the risk of fish escapement, prevent predators from entering the net pen, and is recyclable. To test the alloy netting, an experiment was conducted to compare juvenile cod cultured in traditional nylon nets with cod grown in Seawire copper netting ([email protected]). Six, 0.78 m3 cages were each stocked with 200 Atlantic cod (Gadus morhua) averaging 29 ± 2.2 g and grown for 4 months in coastal waters of New Hampshire, USA. Results of the study indicated no significant differences in cod growth, survival, feed conversion ratio (FCR), specific growth rate (SGR), or Fulton’s condition factor (K) between the fish grown in the copper alloy and nylon nets. A chemical analysis was conducted on the cod and indicated no differences in copper levels in muscle, liver and gill tissues taken from the net treatments. Nylon nets with antifouling paint accumulated significantly more bio-fouling than the copper nets. Materials that were in direct contact with the copper netting (plastic cable ties) fouled heavily with hydroids indicating minimal leaching to the environment. This study describes some of the beneficial attributes of copper netting, however future studies need to be conducted over a longer period of time, on a larger scale, and in a more energetic environment to definitively test the utility of this new product

    Lining of cast iron cylinder with copper alloy utilising high temperature oxidation

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    Lining the inner surface of a cast iron hydraulic cylinder with copper alloy would generally not be possible. In this study, the surface of a cast iron cylinder was decarburised by high temperature oxidation. The cylinder, after decarburisation, was filled with borax anhydride and heated at a temperature of 1203 K. Molten copper alloy was then injected into the cylinder, displacing the molten borax anhydride. After cooling, the embedded copper alloy was drilled along its centre axis so that a prescribed thickness of the copper alloy remained. Thus, the cast iron cylinder could be successfully lined with copper alloy
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