Page 351 - Book Hosokawa Nanoparticle Technology Handbook

6.2 MECHANICAL PROPERTIES FUNDAMENTALS

Figure 6.2.3
Weibull plot of the strength of Al O and Al O –SiC
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nanocomposites.

Figure 6.2.4
Influence of SiC content on the strength and the fracture
toughness of Si N –SiC nanocomposites.
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Figure 6.2.5
Fractography is important to evaluate fracture ori- Scanning probe microscope images of fracture surface
gin and/or fracture process. Methodology of fractog- before and after corrosion test of Ca- SiAlON
raphy should be referred to the other specialized nanoceramics. (a) Before corrosion test. (b) After
book. Optical microscope and scanning electron corrosion test in 80 C H SO aq.
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microscope are generally used for fractography.
Fractography of scanning probe microscope in fracture mode from transgranular to intergranular
nanoscale (nanofractography) has also been carried fracture.
out in recent study. Fig. 6.2.5 shows fracture surface
of Ca- SiAlON nanoceramics before and after cor-
rosion test observed by scanning probe microscope 6.2.1.3 Fatigue behavior
[2]. Although there was no glass phase in grain Fatigue behavior of nanostructured materials is
boundary because it was fabricated using 30 nm of evaluated in the same way as strength measurement
Ca- SiAlON nanoparticles without sintering aids, by applying cyclic loading. Fig. 6.2.6 shows fatigue
corrosion advanced along grain boundary to change behavior of polypropylene nanocomposites [3].
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