Materials Technology Properties of Materials Overview Properties of

Materials Technology Properties of Materials

Overview – Properties of Materials OPTION The student will learn about… Grouping of materials according to properties of electrical and thermal conductivity, thermal expansion, optical, magnetic and mechanical properties

Overview – Properties of Materials It is the arrangement of atoms within a material that greatly influences that materials behaviour and it’s properties • Hardness • Ductility • Malleability • Conductivity • Thermal expansion • Optical properties • Magnetic properties • Melting point, etc. Why would I need to know the properties of a material?

Overview – Properties of Materials listed in order of hardness: • Diamond • Cubic boron nitride (ceramic) • Carbides • Hardened steels • Cast irons • Copper • Acrylic Diamond’s are very hard. • Aluminium I wonder what else could • Lead I use them for besides jewellery?

Overview – Properties of Materials listed in order of ductility • Gold • Silver • Aluminium • Copper • Steel What property of a material is Ductility?

Overview – Properties of Materials listed in order of malleability • Gold • Silver • Aluminium • Copper • Tin • Lead • Steel What material are soft drink cans made from? Why is this material used for the can?

Overview – Properties of Materials listed in order of tensile strength • Steel • Copper • Aluminium • Zinc • Lead What material is used here to support the bridge & why?

Overview – Properties of Materials listed in order of electrical conductivity Gold Lead Platinum Mercury Tin Silver Nickel Silicon Copper Cobalt Iron Zinc Aluminum Titanium Magnesium What material is used in Electrical Wiring. Why is gold or lead not used in electrical wiring?

Overview – Properties of Materials in order of thermal conductivity Silver Copper Gold Aluminum Magnesium Silicon Zinc Cobalt Nickel Iron Platinum Tin Lead Titanium Mercury

Overview – Testing Materials in order of magnetic properties While most materials can be influenced in some way by a magnetic field, Iron, Nickel and Cobalt are thousands of times more susceptible than other materials • Iron • Nickel • Cobalt Compounds containing these elements are also magnetic

Selection of Materials • What Why are properties electrical airplane cookware make bodies wires handles ash generally usually agenerally suitable made from material for wood copper? aluminium hurleys? or plastic? or composites?

Selection of Materials • Physical Properties • In answering the previous questions we have seen that the physical properties of a material have a large part to play in its selection for a particular application. • Hardness, ductility, density, conductivity, melting point, • cost of raw material, suitability for recycling, ease of manufacture, etc.