materials lecture 1

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materials define

specific study of materials, their makeup and behaviour
materials engineering define

applies knowledge from material science so that materials can be converted into products by society.
materials engineering focuses on

the structures of materials on an atomic scale and also on their macroscopic properties
what are the different types of materials
- metals
- polymers
- ceramics and glasses
- composites
a metal is
- certain elements
- alloys (combination of metallic elements)
properties of metals
- good conductors of heat and electricity
- malleable
- ductile
- strong
- react with air and water
properties of polymers
- weak
- ductile
- low density
- insulators
- cheap
define ceramics

solid compounds, formed by the application of heat (or heat and pressure) comprising at least one metal and one non-metal element
properties of ceramics
- electrically insulating
- heat resistant
- brittle
- difficult to process
examples of ceramics
- porcelain
- earthware
- bricks
characteristics of composites
- suitably arranged mixture of 2 or more materials with an interface separating them.
- the two different materials must differ in form and chemical composition and must be essentially insoluble in one another
mechanical properties
- ductility
- fatigue limit
- flexural strength
- fracture toughness
- tensile strength
- yield strength
- young's modulus
thermal properties
- boiling point
- coefficient of thermal expansion
- emissivity
- melting point
- specific heat
- thermal conductivity
- thermal diffusivity
- thermal expansion
define viscosity

a fluid property that provides indication of the resistance to shear within a fluid
in liquids how does viscosity vary with temperature

viscosity tends to decrease with an increase in temperature
define high viscosity

liquid will not flow easily
chemical properties
- heat of combustion
- enthalpy of formation
- toxicity
- chemical stability
- flammability
- preferred oxidation state
- pH
- reactivity
copper properties
- high electrical conductivity
- good formability
grey cast iron properties
- castable
- machinable
- vibration damping
alloy steels properties

significantly strengthened by heat treatment
ceramics properties
- optically useful
- thermal insulating
- melt at high temperatures
- relatively inert to molten metal
barium titanate properties

converts sound to electricity
polyethythene properties

easily formed into thin, flexible airtight film
epoxy properties

electrically insulating and moisture resistant
phenolics properties

strong and moisture resistant
silicon properties

unique electrical behaviour
GaAs properties

converts electrical signals to light
graphite epoxy properties

high strength to weight ratio
tungsten carbide cobalt properties
- high hardness
- good shock resistant
titanium clad steel properties
- low cost and high strength of steel
- corrosion resistance of titanium

Author

ghoran

329077

Card Set

materials lecture 1

Description

uni year 1 materials module

Updated

2017-03-01T19:56:19Z

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