ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Al2O3/24%ZrO2 composite, which is mainly composed of lath-shaped and rod-shaped α-Al2O3matrix containing ZrO2 nano-micron fibers, was obtained from in-situ growth in the melts produced bycombustion synthesis. The results from XRD, SEM and EPMA showed that, besides the rod-shaped andlath-shaped α-Al2O3 grains, there are also t-ZrO2 or m-ZrO2 independent phases and Cr metallic particlesat the boundaries of rod-shaped grains. The strength and toughness were measured to be 1186 MPa and12.8MPa·m0.5 respectively. The procedure for toughening ceramics relies on coordinated action ofmultiple toughening mechanisms involving reinforcement-induced toughening by ZrO2 nano-micronfibers, deflection-induced toughening, stress-induced transformation toughening, crack-bridgingtoughening by lath-shaped α-Al2O3 grains as well as deformation-induced toughening by Cr metallicparticles, and promises the occurrence of a sharp rising R-curved behavior
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2257.pdf
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