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http://dx.doi.org/10.4191/kcers.2012.49.4.369

A Novel Method to Fabricate Tough Cylindrical Ti2AlC/Graphite Layered Composite with Improved Deformation Capacity  

Li, Aijun (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)
Chen, Lin (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)
Zhou, Yanchun (Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.4, 2012 , pp. 369-374 More about this Journal
Abstract
Based on the structure feature of a tree, a cylindrical $Ti_2AlC$/graphite layered composite has been fabricated through heat treating a graphite column and six close-matched thin wall $Ti_2AlC$ cylinders bonded with the $Ti_2AlC$ powders at $1300^{\circ}C$ and low oxygen partial pressure. SEM examination reveals that the bond interlayers between cylinders or that between cylinder and column are not fully dense without any crack formation. During the compressive test, the strain of the $Ti_2AlC$/graphite layered composite is about twice higher than that of the monolithic $Ti_2AlC$ ceramic, and the compressive strength of the layered composite is 348 MPa. The layered composite show the noncatastrophic fracture behaviors due to the debonding and shelling off of the layers, which are different from the monolithic $Ti_2AlC$ ceramic. The mechanism of the improved deformation capacity and noncatastrophic failure modes are attributed to the presence of the central soft graphite column and cracks deflection by the bond interlayers.
Keywords
Biomimetic material; MAX phases; Layered composite; Deformation capacity; Noncatastrophic failure;
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