COMPOSITES - COMPOSITES Artificial combination of matrix...

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COMPOSITES!!! Artificial combination of matrix phase & dispersed phase Matrix: metal, alloy ceramic mat'l polymer Dispersed phase: particulate fiber MMC’s( metal matrix composites) : Works like precipitation hardening-except strengthening maintained at hi temp Particulates: ThO2-dispersed Ni (TD Ni) sintered Al powder (SAP),fibers: SiC, B, Al2O3 , C, SiC & Si3N4 whiskers; Improves: strength creep resistance hi T corrosion resistance Ceramic matrix composites (CMCs) Fibers: Conts - C, SiC, B, Al2O3-long Disconts - C, Al2O3 , SiC whiskers -short Improve fracture toughness: slow crack growth deflect crack tips redistribute stresses around crack tips bridge crack tips Polymer matrix composites (PMCs) mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3 Very common - polyesters, vinyl esters
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Role of matrix in FR composites: a. transfer stresses between fibers b. provide barrier to environment c. protect fibers Matrix/fiber bond: matrix must wet fiber physical & chemical bond desirable mechanical interlocking
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