Refractory Metals and Alloys - Nicofe Materials

Refractory Metals and Alloys. Physical Properties UNIT Molybdenum TZM Molybdenum Tantalum Niobium Tungsten Rhenium; Density lb/cu in 0.369 0.37 0.6 0.31 0.7 0.77 ... With a typical mix of 75% Tungsten and 25% copper, materials are back-cast with copper and can be joined by welding or brazing with various supporting materials. ...

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US Patent for Separation of tungsten from rhenium Patent ...

A process is disclosed for separating tungsten from a solution containing tungstate and perrhenate ions. The process involves reacting a sufficient amount of hydrochloric acid with the solution at a sufficient temperature to form a solid containing essentially all of the tungsten and a liquor containing essentially all of the rhenium, and separating the solid from the liquor.

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Superhard Rhenium/Tungsten Diboride Solid Solutions

Superhard Rhenium/Tungsten Diboride Solid Solutions ... study of properties of solid solutions of tungsten and rhenium diborides. We have found that, while tungsten causes a ... formation of lower borides of tungsten. Each mixture was consolidated into a 12 mm, ∼500 mg pellet by means of a hydraulic press (model

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Rhenium | chemical element | Britannica.com

Perrhenic acid (HReO 4) and its anhydride, the heptoxide, and the perrhenates are common stable compounds in which rhenium is in the +7 state. Natural rhenium is a mixture of the stable isotope rhenium (37.4 percent) and the radioactive rhenium (62.6 percent, 4.1 × 10 year half-life).

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Beijing Sunstone Tungsten Molybdenum Co LTD

Beijing Sunstone Tungsten Molybdenum CO.,LTD(hereinafter referred to as Sunstone) is a national high-tech company and located at Shilong Industry Development Zone in Mentougou District,Beijing. Sunstone specializes in the development and manufacture of products made from tungsten,molybdenum rhenium and its alloys.

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Tungsten Rhenium Produced

tungsten-rhenium -molybdenum-graphite -copper. what materials are used on an rotating anode. ... composed of photons tht are not produced at the focal spot. positive. ... Process of producing rhenium for tungsten-rhenium alloys by the irradiation of tungsten ... a tungsten-rhenium mixture can be produced from tungsten metal. Chat Online .

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Rhenium - McGill School Of Computer Science

Rhenium (IPA: /ˈɹiːniəm/) is a chemical element in the periodic table that has the symbol Re and atomic number 75. A silvery-white, rare, heavy, polyvalent transition metal, rhenium resembles manganese chemically and is used in some alloys. Rhenium is obtained as a by-product of molybdenum refinement and rhenium-molybdenum alloys are superconducting. . This was the last naturally-occurring ...

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Rhenium - Element information, properties and uses ...

Tungsten is the only metallic element with a higher melting point. Uses. Rhenium is used as an additive to tungsten- and molybdenum-based alloys to give useful properties. These alloys are used for oven filaments and x-ray machines. It is also used as an electrical contact material as it resists wear and withstands arc corrosion.

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Properties of tungsten-rhenium alloys - ResearchGate

Properties of tungsten-rhenium alloys. ... Fe and C, including W and Fe, on the surface of failed filament. when failed filaments were treated with plasma in mixture of Ar and CF_4, the amount of ...

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How Rhenium is mined | How Rhenium Metal is Made | Rhenium ...

 · Rhenium is a silvery metal but rarely seen as such on account of its high melting point, which is the third highest after carbon and tungsten. Rhenium is very …

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Tungsten Wire Copper, Tungsten Wire Copper Suppliers and ...

Alibaba.com offers 2,824 tungsten wire copper products. About 50% of these are machining, 7% are wire drawing machines, and 1% are electrical wires. A wide variety of tungsten wire copper options are available to you, such as bare, insulated, and copper wire.

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Tungsten Powder

Pure tungsten powder can be made into wire, rod, tube, plate and other processing materials and certain shape products. Tungsten powder mixed with other metal powder, can be made into all kinds of tungsten carbide, such as tungsten cobalt alloy, tungsten rhenium alloy, tungsten copper alloy and high density tungsten alloy.

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C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - RHENIUM

Rhenium has one of the highest melting points of all elements, exceeded only by tungsten and carbon. It is also one of the most dense, exceeded only by platinum, iridium, and osmium. Rhenium's usual commercial form is a powder, but this element can be consolidated by pressing and resistance-sintering in a vacuum or hydrogen atmosphere.

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Rhenium Tube | AMERICAN ELEMENTS

Rhenium is the fourth densest element exceeded only by platinum, iridium, and osmium. Rhenium's high melting point is exceeded only by those of tungsten and carbon . Rhenium is found in small amounts in gadolinite and molybdenite.

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Molybdenum products material | E-Biz Center of CTIA ...

Molybdenum rhenium alloy. Molybdenum-Rhenium, commonlyknown as Moly-Rhenium (Mo-Re), is used extensively in industries as diverse asmedicine, defense, pure research and production welding. Thanks to itsexcellent thermal and mechanical properties, this material is a less costlyalternative to pure rhenium. Copper molybdenum heat sinks

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Tungsten - Wikipedia

Tungsten's hardness and high density give it military applications in penetrating projectiles. Tungsten compounds are also often used as industrial catalysts. Tungsten is the only metal from the third transition series that is known to occur in biomolecules that are …

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Rhenium | Minerals Education Coalition

Very small amounts are gathered by recycling molybdenum-rhenium and tungsten-rhenium scrap metals. Uses Because of its very high melting point, rhenium is used to make high-temperature alloys (an alloy is a mixture of metals) that are used in jet engine parts.

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Rhenium | chemical element | Britannica.com

Perrhenic acid (HReO 4) and its anhydride, the heptoxide, and the perrhenates are common stable compounds in which rhenium is in the +7 state. Natural rhenium is a mixture of the stable isotope rhenium (37.4 percent) and the radioactive rhenium (62.6 percent, 4.1 × 10 year half-life).

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Tungsten tetraboride, an inexpensive superhard material

 · Tungsten tetraboride (WB 4) is an interesting candidate as a less expensive member of the growing group of superhard transition metal borides.WB 4 was successfully synthesized by arc melting from the elements. Characterization using powder X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) indicates that the as-synthesized material is phase pure.

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Refractory metals - Wikipedia

The five elements niobium, molybdenum, tantalum, tungsten and rhenium are included in all definitions, while the wider definition, including all elements with a melting point above 2,123 K (1,850 °C), includes a varying number of nine additional elements: titanium, vanadium, chromium, zirconium, hafnium, ruthenium, rhodium, osmium and iridium.

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Tungsten | Plansee

Moreover, tungsten-rhenium has a higher recrystallization temperature and better creep resistance. We use the WRe standard compositions – WRe5 and WRe26 – as material for thermoelements in applications of over 2 000 °C. This material is also used in the aviation and aerospace industries. ... The mixture is then compacted at pressures of up ...

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Superhard Rhenium/Tungsten Diboride Solid Solutions

Superhard Rhenium/Tungsten Diboride Solid Solutions ... study of properties of solid solutions of tungsten and rhenium diborides. We have found that, while tungsten causes a ... formation of lower borides of tungsten. Each mixture was consolidated into a 12 mm, ∼500 mg pellet by means of a hydraulic press (model

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Tungsten (W) - WHS Sondermetalle

Tungsten (W) Tungsten is a grey shiny metal with a very high density and features the highest melting and boiling point of all metals. Tungsten is mainly retrieved …

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Why mix rhenium into tungsten

Rhenium significantly reduces the brittle characteristics of tungsten at room temperature.

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Beijing Sunstone Tungsten Molybdenum Co LTD

Beijing Sunstone Tungsten Molybdenum CO.,LTD(hereinafter referred to as Sunstone) is a national high-tech company and located at Shilong Industry Development Zone in Mentougou District,Beijing. Sunstone specializes in the development and manufacture of products made from tungsten,molybdenum rhenium …

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Yahoo Answers: Answers and Comments for Whats are alloys ...

https://qc.answers.yahoo.com/question/index?qid=20061210165837AAuogdW https://qc.answers.yahoo.com/question/index?qid=20061210165837AAuogdW Mon, 11 Dec …

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Pictures, stories, and facts about the element Rhenium in ...

Tungsten-rhenium alloy x-ray tube. The conical disk in this sample is a heavy slab of tungsten-rhenium alloy. The structure above holds a filament that releases electrons, which are accelerated with a high voltage to strike the tungsten-rhenium disk, generating x-rays when they strike.

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US5476531A - Rhenium-bound tungsten carbide composites ...

The procedure of Example 1 is duplicated, save for reducing the preheat temperature from 1800° C. to 1650° C., for a 380 gram quantity of the tungsten carbide/rhenium mixture. The recovered parts)have a density of 16.02 g/cm 3 (99.4% of theoretical) and a Wear Number (ASTM G ), using wear bars having a length of 1.5 inch (3.8 cm) rather ...

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Recovery of rhenium from aqueous mixed metal solutions by ...

Precipitates from the rhenium–aluminum solution and the rhenium–molybdenum solution were separately dissolved in aqua regia and the precipitate from the rhenium–tungsten solution was dissolved in a 2:1:1 (v/v/v) mixture of aqua regia, HF, and aqueous H 2 O 2. XRD analysis of the precipitate was performed by means of a MultiFlex or ...

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Tough SF: Liquid Rhenium Solar Thermal Rocket

 · Liquid Rhenium Solar Thermal Rocket ... The rotating gas mix gets separated here. Dense rhenium vapours fall back down, hot hydrogen escapes. ... It should also be noted that rhenium is a very expensive material. A tungsten-rhenium mix has very similar thermal properties and is …

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Why mix rhenium in tungsten wire

filament, and tungsten wire often doped rhenium, known as the tungsten rhenium wire which can make the extension of tungsten-brittle transition temperature decreased to room temperature or below room temperature. Tungsten rhenium wire doped with rhenium has much better ductility and stability than pure tungsten in high temperature.

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Rhenium | Re - PubChem

Rhenium resembles manganese chemically and is obtained as a by-product of molybdenum and copper refinement. Rhenium shows in its compounds a wide variety of oxidation states ranging from 1 to +7. Rhenium diboride (ReB2) is a hard compound having the hardness similar to that of tungsten carbide, silicon carbide, titanium diboride or zirconium ...

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US4599222A - Recovery of tungsten and rhenium - Google Patents

The resulting hexamine-tungsten-rhenium mixture is agitated at a sufficiently low temperature preferably below about 20° C. for a sufficient time, preferably at least about 6 hours to form a first hexamine tungsten solid which contains the major portion of the tungsten and a first mother liquor which contains the major portion of the rhenium.

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Radiochemical separation of rhenium(VII) from tungsten(VI)

RADIOCHEMICAL SEPARATION OF RHENIUM(VII) FROM TUNGSTEN(VI) ... several radioactive isotopes of tungsten and rhenium. As shown in the activation ... the column was effected with a mixture of methyl ethyl ketone and hydrochloric acid. HALDAR and WII6 4 separated rhenium…

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Rhenium-bound tungsten carbide composites - The Dow ...

 · Rhenium-bound tungsten carbide composites ... for a 380 gram quantity of the tungsten carbide/rhenium mixture. The recovered parts)have a density of 16.02 g/cm 3 (99.4% of theoretical) and a Wear Number (ASTM G ), using wear bars having a length of 1.5 inch (3.8 cm) rather than 3 inches ...

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Sintering of mixtures of tungsten and rhenium powders

The constitution diagram of the system and experimental curves of sintering shrinkage for mixtures of tungsten and rhenium powders are shown in Fig. 1 a and b. The character of the curves is different for ... For a mixture with the coarse tungsten powder ... Sintering of mixtures of tungsten and rhenium …

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