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

4. 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:

7. Wetting ability → contact angle:

9. 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│

14. Electrical conducting (contact) composites:

15. Production of special composite: superconducting wire

23. The influence of volume percent of reinforcing fiber

24. 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

26. 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

28. a) Production of shell components:

29. b) Casting of rods and profiles

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