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Propiedades dos materiais para a sección bilingüe de tecnoloxía

Propiedades dos materiais para a sección bilingüe de tecnoloxía



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Materials Materials Presentation Transcript

  • Materials Technology, Xosé Rodríguez
  • Properties of materials Toughness : a measure of the ability of a material to withstand a shock load. Hardness : describes the ability of a material to withstand scratching. Strength : the ability of a material to withstand being damaged. Elasticity : the property of certain materials that enables them to return to their original dimensions after an applied load has been removed. Plasticity : plastic materials will remain deformed even when the load has been removed. Conductivity : a measure of the ability of a material to conduct heat or electricity.
  • Plastics
    • Plastics are widely used in the home. There are many different types, some are hard , others are soft . Some are translucent , others are opaque . Propierties :
      • Very low electrical conductivity
      • Low thermal conductivity
      • Low density, plastics are light.
    • There are two main groups:
      • Long chains of molecules make up thermoplastics . These can be softened with heat .
      • The molecules of thermosets interlock to form rigid materials which cannot be softened by heat .
    • Thermoplastics can be INJECTION MOULDED:
      • This machine turns granules into molten plastic.This is injected into a hot mould where it is cooled and solidified to form the required product.
    • Extrusion
      • Molten plastic is pushed through a die to make long recular sections these are then cooled and solidified in a water bath.
    • Vacuum forming
      • Plastic sheet is heated when it is soft it is sucked onto the mould by pumping ou the air form the mould chamber.
  • Metals
    • Propierties of metals
      • High electrical conductivity
      • High thermal conductivity
      • Though, hard and strenght.
    Metals FERROUS Contain IRON NON-FERROUS Contain no IROn
  • Ferrous metals Wrought iron, it has a very low carbon content .
    • Steel
    • is an alloy of iron and carbone
    • with less than 2% of carbone .
      • Stainless steel,
      • also known as inox steel or inox .
    Cast iron is an alloy of iron and carbone with more than 2% of carbone.
  • Wrought iron
  • Steel A steel pylon suspending overhead powerlines.
  • Cast iron
  • Non-ferrous
    • Copper, malleable, ductil, good conductor of heat and electricity.
      • Bronze , alloy copper with tin.
      • Brass , alloy copper with zinc: strong and ductile
    Copper Bronze Brass
  • Non ferrous
    • Aluminium:
    • Light, ductile, soft, high resistance to corrosion, silver colour
  • Non ferrous
    • Tin
      • Tinplate is sheet steel covered with a thin layer of tin .
  • Non-ferrous
    • Lead
    • Blue grey colour, soft and very heavy.
  • I will show you an image, and then you have to say the propierty or material related
    • Toughness,
    • (fragile)
    • Elasticity
    • Strenght
    • Hardness
    • Wrought iron
    • Aluminium
    • Copper