Title :
Microstructure effect of nano-ceramic composites in nano-indentation tests
Author_Institution :
Inst. of Mech., Chinese Acad. of Sci., Beijing, China
Abstract :
The Young´s modulus and hardness of nano-ceramic composites, Al2O3/SiCp, are measured via nanoindenter under peak loads of 3-250 mN and peak depths of 60-920 nm. The testing materials are Al2O3 and Al2O3 containing SiC particles with volume fractions, 5% and 10%. The size of SiC particle is about 60-100 nm. The experimental results showed that, the measured Young´s modulus in current composites is higher than that of Al2O3 while indentation is over some depth, which related to microstructure scales in the composites. It is because of that the contact stiffness is sensitive to the microstructure of current composites. The hardness measured in two composites is depth-dependant but that in Al2O3 seems not to be sensitive to the indentation depth.
Keywords :
Young´s modulus; alumina; ceramics; crystal microstructure; elastic constants; hardness; indentation; mechanical testing; nanocomposites; nanoparticles; particle size; silicon compounds; 60 to 100 nm; Al2O3-SiC; SiC particles; Young´s modulus; hardness measurement; microstructure effect; microstructure scales; nanoceramic composites; nanoindentation tests; stiffness; Atomic force microscopy; Capacitive sensors; Ceramics; Composite materials; Current measurement; Materials testing; Mechanical factors; Microstructure; Residual stresses; Silicon carbide;
Conference_Titel :
Intelligent Control and Automation, 2004. WCICA 2004. Fifth World Congress on
Print_ISBN :
0-7803-8273-0
DOI :
10.1109/WCICA.2004.1340477
