New Engineering Materials

Unit - IV

New Engineering Materials

Composites definition and classification – Fibre reinforced plastics (FRP) and fiber reinforced metals Metallic glasses Shape memory alloys Classification - Crystalline Non Crystalline · Bonded ceramics, Manufacturing methods - Slip casting Isostatic pressing Gas pressure bonding - Properties thermal, mechanical, electrical and chemical ceramic fibres ferroelectric and ferromagnetic ceramics - High Aluminium ceramics.

Introduction

Material science is a branch of science which deals with the properties of materials. The continuous development in the field of science and engineering open the way to new technologies and applications. Scientists and technologists are finding out new materials for 'high-tech' applications.

The fast-growing fields such as electronics, photonics, photoelasticity, fibre optics and laser technology require efficient and new stable materials.

Hence, they must possess novel properties like large optical non-linearities, optoelectronic property, high sensitivity to light and large thermal and electrical conductivities. They should also have good mechanical strength, toughness, ductility and lightness.

Materials used in 'high-tech' applications are are usually designed for maximum performance and they are normally expensive. Examples for such materials include titanium alloys for supersonic airplanes, magnetic alloys for computer discs, special ceramics for the heat shield of space shuttle, etc.

Let us discuss some of the newly developed engineering materials, their properties and applications in this unit.