Chap 8 form 4 Flashcards
What is a ceramic?
solid made up of inorganic an non-metallic substances
Examples of ceramic products (3)
Aluminium oxide,silicon carbide,titanium carbide
Basic properties of ceramics (5)
pg 11
Why ceramic hard and resistant to compression?
atoms are bonded by strong covalent and ionic bonds
Why ceramic brittle and weak?
Cannot slide over -force will break the bond between atoms
Why cannot conduct electricty
electrons cannot move freely
Eg of traditional ceramics
clay and kaolin
Meaning of composite materials
hi
Examples of composite materials
reinforced concrete,superconductor,fibre optic,fibreglas,photochromic glass
Properties of concrete
- cannot withstand vibrations
- high compression strength
- low stretching strength
- resistant to corrosion
Properties of steel
- high stretching strength
- corrodes easily
- high tensile strength(strong in tension)
another name for steel
wire mesh
reinforced concrete
- high compression strength
- high tensile strength
- can be moulded into any shape
- resistant to corrosion
- withstand high pressure
uses of reinforced concrete
-to construct frameworks for bridges ,oil platforms .highways, high-rise buildings
properties of superconductor
syarat
- zero resistance
- no loss of energy
What is the low temp for superconductor called and how to achieve
transistion temp by helium
What is perovskite made up of
how to obtain
copper 2 oxide,barium oxide and ytrium oxide(electric insulators)
liquid nitrogen
What is perovskite made up of
how to obtain
copper 2 oxide,barium oxide and ytrium oxide(electric insulators)/high electric resistance
liquid nitrogen
uses of superconductors (3)
- efficient generator
- transformer
- electric cable
- amplifier
- high speed levitated train
uses of fibre optics
- can transmit electronic data or signal
- in the form of light instead of electron
- at a high speed
- uses in endocope
What is fibre optics consist of ?(2)
core
-glass of higher refractive index
enclosed by
-glass cladding of lower refractive index
benefits of fibre optic
- carry more data with less interference
- high chemical stability
- low chemical cost
What is optical fibre made up of?2
plastic and glass fibre
properties of plastic (optic fibre)
- high compression strength
- flexible
Properties of glass fibre (optic fibre )
- low compression strength
- hard
properties of optic fibre
- high compression strength
- flexible
Function of alloying
1) increase hardness ad strength of metal
2) prevent corrosion or rusting
3) improve appearance
carbon steel
major -iron
minor -carbon
duralumin
body or airplanes
racing bikes
aluminium
copper
mg
mn
bronze
medals
monuments
trophies
brass
musical instrument
doorknob
steel vs stainless steel
iron carbon
iron ,chromium ,nickel
