ELECTRICAL ENGINEERING MATERIALS (18EE642)

ELECTRICAL ENGINEERING MATERIALS

• Course Code 18EE642 
• CIE Marks 40
• Teaching Hours/Week (L:T:P) (3:0:0) 
• SEE Marks 60
• Credits 03 
• Exam Hours 03 

Course Learning Objectives:

• To impart the knowledge of conducting, dielectric, insulating and magnetic materials and their
applications.
• To impart the knowledge of superconducting materials and their applications

Module-1

Introduction to Electrical and Electronic Materials: Importance of materials, Classification of electrical
and electronic materials, Scope of electrical and electronic materials, Requirement of Engineering materials, Operational requirements of electrical and electronic materials, Classification of solids on the basis of energy gap, Products – working principle and materials, Types of engineering materials, Levels
of material structure. Spintronics and Spintronic materials, Ferromagnetic semiconductors, Left handed
materials. Conductors: Conductor materials, Factors affecting conductivity, Thermal conductivity, Heating effect of current, Thermoelectric effect, Seebeck effect, Thomson effect, Wiedemann – Franz law and Lorentz relation, Problems.

Module-2

Conductive Materials and Applications: Mechanically processed forms of electrical materials,
Types of conducting materials, Low resistivity materials, High resistivity materials, Contact
materials, Fusible materials, Filament materials, Carbon as filamentary and brush material, Material for
conductors, cables, wires, solder, sheathing and sealing. Dielectrics: Introduction to dielectric materials, classification of dielectric materials, Dielectric constant, Dielectric strength and Dielectric loss. Polarization, Mechanisms of polarization, Comparison of different polarization process, Factors affecting polarization, Spontaneous polarization, Behavior of polarization under impulse and frequency switching, Decay and build-up of polarization under ac field, Complex dielectric constant.

Module-3

Insulating Materials: Insulating materials and applications – Ceramic, Mica, Porcelain, Glass, Micanite
and Glass bonded mica. Polymeric materials – Bakelite, Polyethylene. Natural and synthetic
rubber. Paper. Choice of solid insulating material for different applications, Liquid insulating materials
– Requirements, Transformer oil, Bubble theory, Aging of mineral insulating oils. Gaseous insulating
Materials – Air, Nitrogen, Vacuum. Magnetic Materials: Origin of permanent magnetic dipole, Magnetic terminology, Relation between relative permeability and magnetic susceptibility. Classification of magnetic materials, Diamagnetic, Paramagnetism, Ferromagnetism, Antiferromagnetic and the corresponding materials. Ferrimagnetism and ferrites – properties and applications, Soft and hard ferrites. Curie temperature, Laws of magnetic materials. Magnetization curve, Initial, and maximum permeability. Hysteresis loop and loss, Eddy current loss.

Module-4

Magnetic Materials (continued):Types of magnetic materials, Soft and hard magnetic materials, High energy magnetic materials, Commercial grade soft and hard magnetic materials. Superconductive Materials: Concept of superconductors, Meaning of phenomenon of superconductivity, Properties of superconductors, Types of superconductors, Critical magnetic field and critical temperature, Effects of Isotopic mass on critical temperature, Silsbee rule, Depth of penetration and coherence length. Ideal and Hard superconductors, Mechanism of super conduction, London’s theory for Type I superconductors, GLAG theory for Type I superconductors, BCS theory, Applications and limitations. Applications of high temperature superconductors, Superconducting solenoids and magnets, MRI for medical diagnostics.

Module-5

Plastics: Introduction, Thermoplastics, Rubbers, Thermosets, DC and AC properties, Mechanical properties and processing of plastic. Materials for Opto – Electronic Devices: Introduction, Optical phenomena, Reflection, Refraction, Transmittivity, Scattering, Optical absorption, Optical properties of non-metals, Optical properties of metals, Optical properties of semiconductors, Optical properties of insulators. Luminescence, Opto – Electronic devices, Photoconductivity, Photoconductive cell.

Course Outcomes: At the end of the course the student will be able to:

 Discuss electrical and electronics materials, their importance, classification and operational
requirement
• Discuss conducting, dielectric, insulating and magnetic materials used in engineering, their properties
and classification.
• Explain the phenomenon superconductivity, super conducting materials and their application in
engineering.
• Explain the plastic and its properties and applications.

Question paper pattern:

 The question paper will have ten full questions carrying equal marks.
 Each full question will be for 20 marks.
 There will be two full questions (with a maximum of four sub- questions) from each module.
 Each full question will have sub- question covering all the topics under a module.
 The students will have to answer five full questions, selecting one full question from each module.

Textbook

1 Advanced Electrical and Electronics Materials; Processes and Applications K.M. Gupta, Nishu Gupta Wiley 1st Edition, 2015

Reference Books

1 Electronic Engineering Materials R.K. Shukla, Archana Singh McGraw Hill 2012
2 Electrical Properties of Materials L Solymar et al Oxford 9th Edition, 2014
3 Electrical Engineering Materials A.J. Dekker Pearson 2016
4 Principle of Electronic Materials and Devices S.O. Kasap McGraw Hill 3rd Edition 2010