Lecture 2: Engineering Materials - Manufacturing Technology PDF

EIM 1101 Manufacturing Technology Lecture 2: Engineering Materials Department of Industrial and Management Engineering Slides have voice over Main Material Components of a Car 2/14 Engineering Materials 3/14 ...

EIM 1101 Manufacturing Technology Lecture 2: Engineering Materials Department of Industrial and Management Engineering Slides have voice over Main Material Components of a Car 2/14 Engineering Materials 3/14  Classification of Engineering Materials Metals Polymers Ceramics Composites Ferrous Nonferrous containing iron NOT containing Thermoplastics Thermosets (Fe) iron (Fe) Ex: Glass, Diamond, Polymer matrix, Oxides, Metal Matrix, Nitrides, Ceramic Matrix. Ex: Steels, Ex: Gold, Silver, Carbides. Stainless Aluminum, Ex: Polyethylene, Ex: Epoxy, Steels, Cast Copper, Rubber Irons. Titanium. Polypropylene. 4/14  Metals Ferrous Metals Wrought Iron Plain Carbon Steel Alloy Steel Cast Iron (Pure iron) (Steel) Some elements are Iron Carbon alloy that Melting Temp = 1539 ℃ Iron Carbon alloy that added to carbon steel to has more than 2% has less than 2% carbon improve its properties. carbon. Has a relatively low Ex: Nickel-chromium melting temperature. steel (Stainless steel) 5/14  Metals Non-Ferrous Aluminum Copper Melting temperature = 658°C Melting Temp.= 1083°C Has good rust resistance Used in cables Light in weight. Copper + Zinc = Brass Used in manufacturing of kitchenware. Copper + Tin = Bronze 6/14  Polymers Thermoplastics Thermosets A polymer that becomes A thermoset, pliable or moldable is a polymer that above a specific irreversibly cures. The temperature and returns cure may be done to a solid state upon through heat or through cooling. a chemical reaction. 7/14  Ceramics Ceramics are compounds of metallic and non-metallic elements. Ex: Glass, Diamond, Oxides, Nitrides, Carbides. 8/14  Composites A composite is a combination of two or more chemically distinct materials whose physical characteristics are superior to its constituents acting independently. Composites have high strength to weight ratio. 9/14  Crystal Structure of Materials Cl- Na+ Crystalline structure The arrangement of the atoms in the crystal is called crystalline structure. Unit cell The smallest repeating group of atoms showing the characteristic lattice structure of a particular material is known as a unit cell. 10/14  Metallic Crystal Structure ( Unit Cell) Remember: when you see this icon on a slide, this means you need to memorize it as it can be on the exam. Body Centered Cubic Face Centered Cubic Hexagonal Closed Pack BCC FCC HCP Chromium, Iron, Aluminium, Copper, Gold, Magnesium, Titanium, Zinc Molybdenum, Tungsten Lead, Silver, Nickel 11/14  Material Selection Density Mechanical High Temp. Strength Stability Metals High Medium to High Good to Very Good Polymers Low Low to medium Relatively Poor Ceramics Medium High to Excellent Excellent Composites Low Medium to High Poor to Excellent 12/14 Material Selection 13/14 Thanks