This document provides an introduction to engineering materials. It discusses that engineering materials is an interdisciplinary field that investigates the relationship between the atomic/molecular structure of materials and their macroscopic properties. The field is concerned with the design, manufacture, and use of all classes of materials, including their energy, environmental, health, economic, and manufacturing issues. The document then provides an overview of ionic crystals, including that they are formed by the transfer of electrons, have high melting points, conduct electricity when molten, have low thermal conductivity, and are soluble in polar solvents. Examples of applications of ionic crystals are also given.

1. INTRODUCTION TO
ENGINEERING MATERIALS
BY GANESH
KULKARNI

2. Why should I study Engineering Materials?
The world is in the middle of a materials revolution.
Materials science and engineering has transformed
every aspect of modern living.
 Advances in engineered materials are crucial to the
continued vitality of countless industries.

3. OVERVIEW OF THE COURSE
ENGINEERING MATERIALS IS AN INTERDISCIPLINARY FIELD INVOLVING THE
PROPERTIES OF MATTER AND ITS APPLICATIONS TO VARIOUS AREAS OF
SCIENCE AND ENGINEERING. THIS SCIENCE INVESTIGATES THE RELATIONSHIP
BETWEEN THE STRUCTURE OF MATERIALS AT ATOMIC OR MOLECULAR SCALES
AND THEIR MACROSCOPIC PROPERTIES.
THE FIELD IS CONCERNED WITH THE DESIGN, MANUFACTURE AND USE OF ALL
CLASSES OF MATERIALS (INCLUDING METALS, CERAMICS, SEMICONDUCTORS,
POLYMERS AND BIO MATERIALS), AND WITH ENERGY, ENVIRONMENTAL,
HEALTH, ECONOMIC, AND MANUFACTURING ISSUES RELATING TO MATERIALS.
IT EMPHASIZES THE STUDY OF THE STRUCTURE OF MATERIALS AND
PROCESSING- STRUCTURE-PROPERTY RELATIONSHIP IN MATERIALS.

4. COURSE OUTCOMES
o Describe the role of engineering materials in the
design of systems and their selection strategy.
o Apply the knowledge of crystal structure and
deformation behaviour to select appropriate
material.
o Discuss how engineering materials respond to
applied mechanical loads in both a macroscopic and
microscopic sense at ambient temperature and high
temperature applications.
o Explain the concepts of solid solutions as a basis for
constructing phase diagrams.

7. CLASS OF MATERIALS
Ionic crystals
Covalent materials
Metal & alloys
Semiconductors
Superconductors
Polymers
Composite materials
Ceramics
Inorganic glasses
Catalysts

8. IONIC CRYSTALS
Ionic Bond is Formed by transfer of
electrons
Example: NaCl,KCl,MgCl2 etc
Properties of Ionic Crystals
1.Solid Crystals have high melting
point.
2.They Conduct electricity in molten
state.
3.Low thermal conductivity.
4.Soluble in polar solvents.

9. APPLICATION OF IONIC
CRYSTALS
Nacl is used for cooking purpose which make
food tasty.
 Preservation of cheese, dairy products, meat,
pickles and sauces.
 Cacl2 salt is used as Road salt to remove
snow fallen on road in Cold countries. It
lowers the freezing point water.
Potassium chloride produced is used for
making fertilizer