TITLE

Enhancement of fracture toughness in nanostructured diamond–SiC composites

AUTHOR(S)
Yusheng Zhao; Jiang Qian; Daemen, Luke L.; Pantea, Cristian; Jianzhong Zhang; Voronin, Georgiy A.; Zerda, T. Waldek
PUB. DATE
February 2004
SOURCE
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1356
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We synthesized diamond–SiC nanocomposites with superhardness and greatly enhanced fracture toughness through a synthetic approach based on high-energy ball milling to form amorphous Si precursors followed by rapid reactive sintering at high pressure (P) and high temperature (T). We show how the simultaneous P–T application allows for better control of the reactive sintering of a nanocrystalline SiC matrix in which diamond crystals are embedded. The measured fracture toughness K[sub IC] of the synthesized composites has been enhanced greatly, as much as 50% from 8.2 to 12.0 MPa m1/2, as the crystal size of the SiC matrix decreases from 10 μm to 20 nm. Our result contradicts a commonly held belief of an inverse correlation between hardness and fracture toughness. We demonstrate the importance of nanostructure for the enhancement of mechanical properties of the composite materials. © 2004 American Institute of Physics.
ACCESSION #
12292650

 

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