Advanced material and technologies, MSc

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Presentation transcript:

Advanced material and technologies, MSc Composite materials Advanced material and technologies, MSc 2017

Wetting ability → surface energy: Surface energy: excess energy per unit surface (J/m2): molar surface (m2/mol) Wetting ability → surface energy: Work (energy) required to create a unit boundary, at constant T, V, mi = concentration. l dx dA F Surface tension:

Wetting ability → contact angle:

Systems hardened with oxide dispersion: Production: - Mechanical mixture of the components, compacting, sintering, - Chemical reaction in solid state: 2O(dissolved) + Si → SiO2 (precipitated) 3O(dissolved) + 2Al → Al2O3 (precipitated) 2O(dissolved) + Ti → TiO2 (precipitated) mechanism: internal oxidation criterion: │∆GMeO│>│∆GmatrixO│

Electrical conducting (contact) composites:

Production of special composite: superconducting wire

The influence of volume percent of reinforcing fiber

Production of fibers: Drawing: alloys, glass, polimers Special processes: - B: CVD process on W core, Borsic: B fiber coated with SiC - carbon: high temperature process from polymer fiber, rayon or pitch

Production of carbon fiber: Pyrolysis of cellulose-based filament: ca. on 1000C shrinkage during removal of H2O and CO2 Pyrolysis of polyacrilonitrile (PAN): common process Melt spinning process of black pitch

a) Production of shell components:

b) Casting of rods and profiles

SiC fibers are applied to strengthen glass, aluminum oxide and SiC