Precious, Refractory, and Specialty Metals - PowerPoint PPT Presentation

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Precious, Refractory, and Specialty Metals

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Molybdenum has a BCC crystal structure and exhibits a nil ductility transition temperature between 20 C and 95 C (0 F and 200 F). See Figure 24-8. – PowerPoint PPT presentation

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Title: Precious, Refractory, and Specialty Metals


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Chapter 24
  • Precious, Refractory, and Specialty Metals

Precious Metals Refractory Metals Specialty
Metals
3
  • Industrial applications of the precious metals
    utilize the unique properties they exhibit.

4
  • Pure silver has the lowest electrical resistivity
    of any metal and is an excellent conductor of
    heat.

5
  • Gold is commonly alloyed with copper and silver
    to increase hardness, increase strength, and
    minimize cost.

6
  • The platinum group can be divided into three sets
    of twins by the crystal structures and properties
    they exhibit.

7
  • The recrystallization temperatures of pure metals
    is approximately 40 of their melting
    temperatures.

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  • Wrought tantalum alloys have good ductility at
    cryogenic temperatures.

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  • Niobium is solid solution hardened by tantalum,
    tungsten, molybdenum, titanium, and zirconium.

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  • The major use of molybdenum is as an alloying
    element in steels, cast irons, heat-resistant
    alloys, and corrosion-resistant alloys.

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  • An important use of tungsten is as an alloying
    element in steels, high-speed tool steels, and
    nickel-cobalt alloys.

12
  • The major use of beryllium is as an alloying
    element in copper and nickel to produce
    age-hardening alloys for springs, electrical
    contacts, spot welding electrodes, and
    nonsparking tools.

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  • The major use of zirconium is as zircon sand in
    foundries.

14
  • Most zirconium alloys are dilute alpha alloys and
    consist of alpha phase at room temperature.
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