Write a short note on particle reinforced composites

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written 6.1 years ago by

vibhavarikulkarni • 520

Particle reinforced composite :

Particles are made from metal powder, mineral powder, ceramic powder & carbon black. Particles increases elasticity modulus & decreases ductility & permeability. It also produces inexpensive composite material.

i) Large particle composite: Its features are as follows

Particulate phase is harder & stiffer than matrix phase.
There is restriction of movement of matrix phase surrounding the dispersed phase.
Matrix phase transfer some of the applied stress to the particles.
The strength of bonding between matrix phase & dispersed phase at the interface decides the mechanical properties.

Examples:

Material	Matrix	Dispersed	Properties	Uses
1.Concrete	cement	Sand & gravel	Harder & stronger than plain cement	Construction purpose
2.Oxide based cermets	Cr	Al2O3	Good strength & good shock resistance properties	Shock resistant equipment
3.Carbide based cermets	Co & Ni	1.WC &TiC	1.increases surface hardness	Wire drawing, dyes& machine parts
	Co & Ni	2.CrC	2. High abrasion & resistance resistance	Valves, Spray nozzles & pump parts
4.Modern rubber	Vulcanized rubber	Carbon black,(Stiffer)	Enhancement in mechanical properties	Used in automobile industry for making tires
5.Spherodized steel	α Iron( ductile)	Fe3C cementite(brittle)	Ductility of composite decreases	Spherical steel structure for fixing tires

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