Definition

•Are formed by the combination the materials

• Having different physical and chemical properties

•Constituents remain separate and distinct.

•They do not dissolve or blend into each other.

•Composites are materials that satisfy the technology

•They have several advantageous features:

High specific strengthHigh specific modulusOther desired properties

CONSTITUENTS OF COMPOSITES Composites consists minimum of two parts

- Bulk or a continuous phase (matrix.) -And dispersed phase (reinforcement.)

MATRIX:1.The individual reinforcing elements protecting 2. It maintains their relative positions.3.Prevents the propagation of brittle cracks

REINFORCEMENT:It imparts special electrical and mechanical

properties

CLASSIFICATION OF COMPOSITES

1. Particle Reinforcement composites.2. Structural Composites.3. Fiber Reinforcement composites.

i. Continuous fibers with unidirectional aligned.ii. Discontinuous fiber and unidirectional aligned.iii. Discontinuous fiber and randomly oriented.

PARTICLE REINFORCED COMPOSITE

These are the cheapest and used.

They fall in two categories (size)

1. Large-Particle Composites

-Consist of a high volume fraction of large sized hard particles embedded in a relatively soft matrix.

2.   Dispersion-Strengthened Composites

-Contains extremely small sized particles dispersed -At low concentration which increases the matrix

attractions -At the atomic level there by enhancing the strength