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Refractory metals are a class of metals that are extraordinarily resistant to heat and wear and have extremely high melting points. Reactive metals have a strong affinity for oxygen and nitrogen at elevated temperatures and are highly resistant to corrosion at low temperatures.
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  • Tantalum Surface Alloys Prevent Corrosion (.pdf)
    . Such parts include standard stainless steel valves,. fittings, instrumentation, pumps, laboratory equipment, and custom parts. · The furnace is heated to a temperature of more than 700°C (1290°F). At this. temperature, the tantalum metal is chemically reacted and vaporized. The high. temperature promotes
  • Tantalum Suface Alloying of Parts for Corrosice Hydrogen Production Process (.pdf)
    With increasing demand for energy and environmental concerns on the rise, there is a tremendous focus to develop the next generation of energy. Advanced processes for coal, natural gas, and especially hydrogen are being explored as possible alternatives to oil to serve the worls' ever-increasing
  • Refractory Metals
    , tantalum, molybdenum, and columbium (niobium). They are mutually soluble and form solid-solution alloys with each other in any proportion. These four refractory metals and their alloys are available in mill forms as well as products such as screws, bolts, studs, and tubing. Although the melting points
  • A Room Temperature, Low-Stress Bonding Process to Reduce the Impact of Use Stress on a Sputtering Target Assembly (.pdf)
    As semiconductor processing has moved to 300mm wafers, the size of deposition targets, including tungsten, tantalum, and molybdenum has grown, and process complexity has increased as well. This added size and complexity contributes to the stress on a target assembly during the physical vapor
  • Niobium (Nb) for Hot Concentrated Nitric Acid: Material Selection & Field Experiences with Nb-Shell & Tube Heat Exchangers (.pdf)
    The highly acid, oxidizing conditions in parts of nitric acid plants severely tax conventional materials such as high-purity aluminum and high-silicon stainless steel. Long-term field-testing of these materials along with tantalum, tantalum-25%tunsten and niobium showed excellent performance
  • MICRO:Rosenberg (March 2001)
    nitride (TiN), titanium tungsten, cobalt silicide, tungsten silicide, tantalum, and tantalum nitride. These metal compounds are used for barrier/liner processes because they form high-stress films when deposited. However, high stress, along with plasma and thermal cycling, tends to cause refractory
  • MICRO:Building Copperopolis, by Ted Cacouris, p.43 (July '99)
    , diffusion barriers such as silicon nitride and tantalum or tantalum nitride have been created. Preventing contamination caused by copper diffusion from the inadvertent deposition of copper on wafer backsides poses a more daunting challenge. This problem has been addressed in part by more stringent
  • Refractory Hard Metals
    for applications requiring wear resistance; the high-cobalt grades serve where impact resistance is required. Tantalum carbide and tungsten carbide combined in a matrix of nickel, cobalt, and/or chromium provide an RHM formulation especially suited for a combination of corrosion and wear resistance

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