Composites+ modern materials

each year hundreds of new materials are developed
1. either due to new technology
2. or a push from a designer
  1. e.g If existing materials do not have the desired properties for a prospective product
improve properties- by combining materials
1. composite
  1. different to an alloy, as in a composite the materials are not chemically bonded together
    1. if you cut through a composite, you can still see the different elements
  2. have been used for over 6000 years
    1. wattle and dawb
  3. reinforced concrete
    1. steel is used to improve tensile strength
      1. used in buildings esp skyscrapers
  4. glass- reinforced plastic
    1. (GRP) fibreglass
      1. glass fibres in a matrix of epoxy or polyester resin
        light + stronger than plastic- canoes
  5. carbon fibre reinforced plastic
    1. CFRP
      1. strength of carbon fibre + rigidity of polyester resin
        racing bikes and helmets
  6. these are made using strands of fibre in a matrix of liquid resin, which hardens to form the composites
  7. difficult to separate elements in a composite
    1. and not cost-effective to try
      1. so they can't be recycled, have to be thrown away-landfill
        thus, many people believe that composites are not environmentally friendly materials
nanotechnology
1. the science of the very small
  1. particles made from it have dimensions less than 100 nanometres
2. nano-composites
  1. can be combined with other materials to improve properties
    1. e.g
      1. glass can be coated with a layer of nanomaterials that repel water and dirt- windows that never need cleaning
      2. carbon nanotubes can reduce the weight of CFRP, without reducing its strength
        e.g reducing weight of tennis frames + high performance racing bikes
  2. currently quite expensive to make
  3. risk that if released into environment, could cause novel types of pollution
    1. altho, ofc, some may be developed which help the environment
3. controlling matter on an atomic scale, to form it into new materials with diff properties

Nächster

Composites+ modern materials

Beschreibung

Zusammenfassung der Ressource

ähnlicher Inhalt

	Erstellt von fampulli vor fast 10 Jahre