Technological materials

Technological materials

1. They are all those materials that are used to build objects that are obtained from materials cousins.

   • 1)Guys:
     • Raw material: they are natural materials
     • Natural matter: They are called transformed materials.
     • They can also be natural or processed
       • They are classified in:
         • Woods
           • +Natural: pine, beech, oak, cherry, ebony...
             • + Transformed : plywood, chipboard, paper, cork, cardboard...
         • Metals
           • +Metals: iron, silver, aluminum, or copper...
             • +Alloys: brass, bronze, steel, foundry...
         • Plastics
           • + Natural: rubber, latex...
             • + Processed oil: PVC, melamine, silicone, nylon...
         • Materials textiles:
           • + Natural: wool, silk, cotton, hemp, linen...
             • + Transformed: lycra, nylon, rayon, polyester...
         • Construction materials:
           • + Natural: marble, slate, clay, plaster...
             • + Transformed: glass, cement, concrete, bricks, tiles...

2. 2) The choice of materials

   • Each material has properties that make it suitable for a certain use.
     • For ejemple:
       • If I want to make a bed a resistant material
       • A sculpture a material that is pleasing to the eye
       • a plane a light material
       • A toy a material that is not toxic
     • Sensory properties
     • Mechanical properties
       • + Hard, if they are difficult to scratch.
       • +Soft, if they scratch easily.
       • + Tenacious, if they easily withstand blows.
       • +Fragile, if they do not resist blows.
       • +Elastic, if they recover their shape when you stretch them.
       • +Malleable, if they can be easily extended in sheets.
       • +Ductile, if they can be easily extended forming threads
     • Physical properties
       • Drivers
         • -Electric al:stop easily pass through the electricity
         • -Sound: they easily allow sound to pass through them.
         • -Thermal: let the heat pass easily.
       • Insulators
         • -Electric:They do not let electric current through
         • -Thelmal: They don't let heat through easily.
         • -Sound:Prevents sound from spreading

3. 3)The wood

   • -Soft
     • Coming from trees evergreen.
       • Pine, fir or poplar
   • -Hard
     • They are more expensive and difficult to work with.
       • Oak, beech or chestnut.
   • Wood is the solid and rigid part under the bark of the trees trunks. This material is tenacious, heat and electrical isolator, sound conductor, resistant and porous.

4. 4)The metal.

   • Metals are hard, good conductors, they expand and contract with temperature, they easily oxide and they are cold to touch; some of them have magnetic properties.
     • Not ferruus metalas
       • Tin
       • Aluminum
       • Zinc
       • Copper
     • Ferrous metals
       • Iron
       • Steel
       • Foundry

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