Materials Technology, Xosé Rodríguez
Properties of materials Toughness : a measure of the ability of a material to withstand a shock load. Hardness : describes...
Plastics <ul><li>Plastics are widely used in the home. There are many different types, some are  hard , others are  soft ....
<ul><li>Thermoplastics can be INJECTION MOULDED: </li></ul><ul><ul><li>This machine turns granules into molten plastic.Thi...
<ul><li>Extrusion </li></ul><ul><ul><li>Molten plastic is pushed through a die to make long recular sections these are the...
<ul><li>Vacuum forming </li></ul><ul><ul><li>Plastic sheet is heated when it is soft it is sucked onto the mould by pumpin...
Metals <ul><li>Propierties of metals </li></ul><ul><ul><li>High electrical conductivity </li></ul></ul><ul><ul><li>High th...
Ferrous metals Wrought iron,  it has a very low carbon content . <ul><li>Steel   </li></ul><ul><li>is an  alloy  of iron a...
Wrought iron
Steel A steel pylon suspending overhead powerlines.
Cast iron
Non-ferrous <ul><li>Copper,  malleable, ductil, good conductor of heat and electricity. </li></ul><ul><ul><li>Bronze , all...
Non ferrous <ul><li>Aluminium: </li></ul><ul><li>Light, ductile, soft, high resistance to corrosion, silver colour </li></ul>
Non ferrous <ul><li>Tin </li></ul><ul><ul><li>Tinplate  is sheet  steel  covered with a thin layer of  tin . </li></ul></ul>
Non-ferrous <ul><li>Lead </li></ul><ul><li>Blue grey colour, soft and very heavy. </li></ul>
I will show you an image, and then you have to say the propierty or material related
 
<ul><li>Toughness, </li></ul><ul><li>(fragile) </li></ul>
 
<ul><li>Elasticity </li></ul>
 
<ul><li>Strenght </li></ul>
 
<ul><li>Hardness </li></ul>
 
<ul><li>Wrought iron </li></ul>
 
<ul><li>Aluminium </li></ul>
 
<ul><li>Copper </li></ul>
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Materials

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Propiedades dos materiais para a sección bilingüe de tecnoloxía

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Materials

  1. 1. Materials Technology, Xosé Rodríguez
  2. 2. 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.
  3. 3. Plastics <ul><li>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 : </li></ul><ul><ul><li>Very low electrical conductivity </li></ul></ul><ul><ul><li>Low thermal conductivity </li></ul></ul><ul><ul><li>Low density, plastics are light. </li></ul></ul><ul><li>There are two main groups: </li></ul><ul><ul><li>Long chains of molecules make up thermoplastics . These can be softened with heat . </li></ul></ul><ul><ul><li>The molecules of thermosets interlock to form rigid materials which cannot be softened by heat . </li></ul></ul>
  4. 4. <ul><li>Thermoplastics can be INJECTION MOULDED: </li></ul><ul><ul><li>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. </li></ul></ul>
  5. 5. <ul><li>Extrusion </li></ul><ul><ul><li>Molten plastic is pushed through a die to make long recular sections these are then cooled and solidified in a water bath. </li></ul></ul>
  6. 6. <ul><li>Vacuum forming </li></ul><ul><ul><li>Plastic sheet is heated when it is soft it is sucked onto the mould by pumping ou the air form the mould chamber. </li></ul></ul>
  7. 7. Metals <ul><li>Propierties of metals </li></ul><ul><ul><li>High electrical conductivity </li></ul></ul><ul><ul><li>High thermal conductivity </li></ul></ul><ul><ul><li>Though, hard and strenght. </li></ul></ul>Metals FERROUS Contain IRON NON-FERROUS Contain no IROn
  8. 8. Ferrous metals Wrought iron, it has a very low carbon content . <ul><li>Steel </li></ul><ul><li>is an alloy of iron and carbone </li></ul><ul><li>with less than 2% of carbone . </li></ul><ul><ul><li>Stainless steel, </li></ul></ul><ul><ul><li>also known as inox steel or inox . </li></ul></ul>Cast iron is an alloy of iron and carbone with more than 2% of carbone.
  9. 9. Wrought iron
  10. 10. Steel A steel pylon suspending overhead powerlines.
  11. 11. Cast iron
  12. 12. Non-ferrous <ul><li>Copper, malleable, ductil, good conductor of heat and electricity. </li></ul><ul><ul><li>Bronze , alloy copper with tin. </li></ul></ul><ul><ul><li>Brass , alloy copper with zinc: strong and ductile </li></ul></ul>Copper Bronze Brass
  13. 13. Non ferrous <ul><li>Aluminium: </li></ul><ul><li>Light, ductile, soft, high resistance to corrosion, silver colour </li></ul>
  14. 14. Non ferrous <ul><li>Tin </li></ul><ul><ul><li>Tinplate is sheet steel covered with a thin layer of tin . </li></ul></ul>
  15. 15. Non-ferrous <ul><li>Lead </li></ul><ul><li>Blue grey colour, soft and very heavy. </li></ul>
  16. 16. I will show you an image, and then you have to say the propierty or material related
  17. 18. <ul><li>Toughness, </li></ul><ul><li>(fragile) </li></ul>
  18. 20. <ul><li>Elasticity </li></ul>
  19. 22. <ul><li>Strenght </li></ul>
  20. 24. <ul><li>Hardness </li></ul>
  21. 26. <ul><li>Wrought iron </li></ul>
  22. 28. <ul><li>Aluminium </li></ul>
  23. 30. <ul><li>Copper </li></ul>

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