Q.17 Define matrix phase and dispersed phase with examples. (asked in MU Dec 2024; also June 2025 KT)
Best answer
Answer: The matrix is the continuous phase that binds and surrounds the reinforcement; the dispersed phase is the discontinuous reinforcing phase embedded in it, e.g. epoxy matrix with glass fibres.
Matrix phase: the continuous phase of a composite which surrounds and holds the dispersed phase. It binds the reinforcement together, transfers and distributes the load to it, protects it from the environment and damage, and gives the shape and toughness of the part.
Examples: polymers (epoxy, polyester resin) in polymer-matrix composites; aluminium in metal-matrix composites; cement paste in concrete; SiC or alumina in ceramic-matrix composites.
Dispersed (reinforcing) phase: the discontinuous phase (fibres, particles or flakes) embedded in the matrix. It carries most of the load and gives strength, stiffness, hardness or other special properties.
Examples: glass, carbon or Kevlar fibres in epoxy; gravel and sand in concrete; steel rods in RCC; WC particles in cobalt (cemented carbide).
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