Modern composite and emerging technologies Flashcards
what is a composite material
it is made up of two materials with significantly different physical or chemical properties
what can a composite be made up of
it can be a combination of metal, ceramic or polymer
why are composites made
to increase strength to weight ratio, ductility, temperature and shock resistance
properties of thermochromic materials
change colour as temp changes, used for contact thermometers and on batteries
properties of phosphorescent pigments
glow in the dark, able to absorb light energy and store it, the stored energy is released as light over a period of time, can be used for signs or glow in the dark watch faces
properties of reflective films
they recycle light that hasn’t reached its intended target and directs it there, improves privacy and shatter resistance, can be put on windows to reduce UV rays coming through to protect fabrics. Also can be put on vehicles to help with visibility
Hologram definition
an image that appears to be 3D which can be seen with the naked eye, its a photographic recording of a light filed, rather than an image formed by a lens
3 types of hologram
reflection, transmission, embossed,
reflection definition
illuminated by a white light source on the viewing side of the hologram, the light is reflected from the hologram to show the image
transmission definition
viewed by illuminating from the rear with a laser, one advantage is that they can be very sharp load with detail and image can have great depth
embossed definition
found on credit cards, embedded on a thin plastic film backed with reflective aluminium, the aluminium reflects incident light back through the hologram activating it
properties of liquid crystal display
flat panel display or other electronically modulated optical device that uses light modulating properties, doesn’t emit light directly instead uses backlight or reflector to produce images in colour
properties of polyether ether ketone
high performance engineering thermoplastic, high temperature performance, mechanical strength and excellent chemical resistance, used to fabricate items used in demanding applications like bearings pistons and compressor valves
properties of polyphenylsulfone
transparent ridged high temperature engineering thermoplastic, flame retardant, high impact strength and good chemical resistance
properties of graphene
Made from honeycomb sheets of carbon just one atom thick, one of the lightest, thinnest, best heat and electricity conducting materials ever discovered, almost completely transparent. could revolutionise everything from computing to car tires solar cells to smoke detectors.
