(5)-composites(1) Composites are heterogeneous systems,made up of a ceramic, polymeric or metallic matrix into which a second phase is dispersed They are characterized by properties which cannot be obtained by the single constituents
(5)- composites(Ⅰ) • Composites are heterogeneous systems, made up of a ceramic, polymeric or metallic matrix into which a second phase is dispersed • They are characterized by properties which cannot be obtained by the single constituents
(5)-composites(II) 。Made up by two phases MATRIX and SECOND PHASE (also called reinforcing phase) They are classified according to the matrix as: Metal matrix composite(MMC) Ceramic matrix composite(CMC) Glass or glassceramic matrix composite(GMC) Polymer matrix composite Example:plastic reinforced glasses,reinforced concrete
(5)- composites(Ⅱ) • Made up by two phases MATRIX and SECOND PHASE (also called reinforcing phase) They are classified according to the matrix as: • Metal matrix composite(MMC) • Ceramic matrix composite(CMC) • Glass or glassceramic matrix composite(GMC) • Polymer matrix composite Example: plastic reinforced glasses, reinforced concrete, …
(5)-composites(I) They are also classified according to the secondary phase: O Fiber reinforced composites O Particle reinforced composites OThe secondary phase can belong to whatever class of materials
(5)- composites(Ⅲ) They are also classified according to the secondary phase: Fiber reinforced composites Particle reinforced composites The secondary phase can belong to whatever class of materials
(5)-composites:combination of properties Aims Increase the hardness of metals ceramic reinforces >Increase the stiffness and the tensile strength of polymers glass fibers,carbon fibers >Reduce the weight of the components>polymer matrix Examples: Reinforced concrete(ceramic matrix and metallic reinforce) Tyres(polymeric matrix and metallic reinforce) >Plastic reinforced glasses(polymeric matrix,glass fibers)
(5)- composites: combination of properties Aims : Increase the hardness of metals → ceramic reinforces Increase the stiffness and the tensile strength of polymers → glass fibers, carbon fibers Reduce the weight of the components → polymer matrix Examples: Reinforced concrete (ceramic matrix and metallic reinforce) Tyres(polymeric matrix and metallic reinforce) Plastic reinforced glasses(polymeric matrix, glass fibers)