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Pure metal and alloy
 

Pure metal and alloy

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    Pure metal and alloy Pure metal and alloy Presentation Transcript

    • Alloys
    • The Differences Between Pure Metals & Alloys
    • Pure Metals Pure Metals have the following physical properties … High Density. High Melting & Boiling Points. Good Conductors Of Heat & Electricity. Malleable. Ductile. Lustrous.
    • Pure Metals
      • High Density
      • Pure metals is made up of one type of atoms, thus all atoms are of the same size.
      • The atoms in a pure metals are orderly arranged & closely packed together.
      Orderly arranged & closely packed together
    • Pure Metals
      • High Melting & Boiling Points
      • The forces of attraction between the very closely-packed atoms are very strong, thus a large amount of energy is required to overcome these forces.
    • Pure Metals
      • Ductile
      • Although the forces of attraction of the atoms are very strong, they are not rigid.
      • So, when a force is applied, the layers of atoms can slide over one another.
      • This is why metals are ductile @ can be stretched.
    • FORCE FORCE
    • Pure Metals
      • Malleable
      • The arrangement of atoms in pure metals are not perfect because there are some empty spaces in between the atoms.
      • So, when a metal is knocked @ pressed, groups of atoms may slide & then settle into new positions.
    • FORCE
    • The weakness of pure metals are ... WEAK & SOFT due to their DUCTILITY & MALLEABILITY.
    • Alloys
      • Alloy is a mixtures of two or more elements with a certain fixed composition in which the major component is a metal.
      • Characteristics of alloy are, :
      • Stronger
      • Harder
      • Resistant to corrosion
      • Have a better finish
      • &
      • Lustrous
    • Alloys Why Make Alloys ? To increase the strength and hardness of a pure metal. To increase the resistance to corrosion of a pure metal. To improve the appearance of a pure metal.
    • Composition, Properties, & Uses of alloys
    • BRONZE Composition 90% of copper & 10% of tin. Properties Hard, strong, does not corrode easily & shiny surface.
    • BRASS COMPOSITION 70% of copper & 30% of zinc. PROPERTIES Harder than copper.
    • Cupro-nickel COMPOSITION 75% of copper & 25% of nickel. PROPERTIES Beautiful surface, shiny, hard & does not corrode easily.
    • STEEL COMPOSITION 99% of iron & 1% of carbon. PROPERTIES Hard & Strong.
    • STAINLESS STEEL
      • COMPOSITION
      • 74% Iron, 8% Carbon & 18% chromium.
      • PROPERTIES
      • Shiny, strong & does not rust.
    • DURALUMIN
      • COMPOSITION
      • 93% of aluminium, 3% of copper, 3% of magnesium & 1% manganese.
      • PROPERTIES
      • Light & strong.
    • PEWTER
      • COMPOSITION
      • 96% of tin, 3% of copper & 1% of antimony.
      • PROPERTIES
      • Shiny, strong, & does not corrode.
    • 9-CARAT GOLD
      • COMPOSITION
      • 37.5% of gold, 11% of silver & 51.5% copper.
      • PROPERTIES
      • Shiny, strong, & does not corrode.
    • .. THE END ..