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Materials Materials and Components

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reya
21 diapositives · 568 Views · Jul 13, 2014

Materials Materials and Components. To choose the correct material for any particular task is essential for a manufacturing activity. Materials are divided into natural and artificial Natural resources are split into 3 categories Animal Vegetable Mineral . . Materials.

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Materials Materials and Components
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  1. MaterialsMaterials and Components • To choose the correct material for any particular task is essential for a manufacturing activity. • Materials are divided into natural and artificial • Natural resources are split into 3 categories • Animal • Vegetable • Mineral • .

  2. Materials • Artificial Materials . • ARE THOSE WHICH HAVE BEEN MADE BY MAN

  3. Materials TYPES OF MATERIALS • 1º Wood: Divided into two major classifications: • Hardwoods and Softwoods • 2º Metals. There are two significant groups of metals: • Ferrous metal: contain iron • Non-ferrous metals: do not contain iron

  4. Materials . • Ferrous metal example

  5. Materials Non-Ferrous metals • Examples of Non-ferrous metals are: • Aluminium • Copper • Gold • Silver

  6. MaterialsPlastic • Made using coal, gas, animal protein or petrol • On the left, Coal and plastic bottles

  7. MaterialsCeramic, Textiles and Glass • Other Materials used in manufacturing activity are Ceramic, textiles and glass

  8. MaterialsProperties of Materials • Properties of materials can be divided into physical,chemical and ecological

  9. MaterialsPhysical Properties • Electrical Conductivity • When electricity can run though the material. • Examples: • Steelis a good conductor • Wood isn't a good conductor

  10. MaterialsPhysical Properties Optical properties: • How materials behave when light touches them • Them can be classified into: • a) Opaque: No light travels through them. e.g wood • b) Transparent: All light travels through them and you can see what's behind the materials. e.g glass of window • c) Translucent: All light can travel through them but you cannot see what's behind them e.g frosted glass • See examples on page 75

  11. MaterialsThermal Conductivity • ¿ What is conductor and what is insulator ? • Plastic handles….. • Metal Body…….

  12. MaterialsThermal Conductivity • . The ability of the material to conduct heat. e.g. Saucepan. Metal body for thermal conductivity and plastic handles for thermal insulation. • Thermal Insulation = It is a bad Thermal conductor

  13. MaterialsThermal properties • . Dilation: • When material expands ( gets bigger ) due to heat • Contraction: • When material gets smaller due to heat • To think about: Why are rails separated by a gap?

  14. MaterialsThermal properties • . Fusibility is the ability of a material to change into a liquid when heated to its melting point. • examples of melting points • Iron´s melting point...........1535 ºC • Copper´s melting point..........1083 ºC

  15. MaterialsSound Properties • The ability of materials to conduct sound • To think about. Can you speak on the moon? • Write some examples of good and bad conductors.

  16. MaterialsChemical Properties • Oxidation. • The change that occurs to most metals when in contact with air or/and water

  17. MaterialsEcological Properties. • Recyclable. Materials that can be reused • Toxic. Materials which are harmful to the environment • Biodegradable. Materials that decompose naturally with time. eg • An apple take about 20 days to decompose • Plastic takes about 100 years • Glass takes about 400 years

  18. Materials • Now, visit this web site • bbc.co.uh

  19. Materials • .

  20. Materials • .

  21. Materials • .