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Three‐Dimensional Printing of Nanolaminated Ti 3 AlC 2 Toughened TiAl 3 –Al 2 O 3 Composites
Author(s) -
Yin Xiaowei,
Travitzky Nahum,
Greil Peter
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01668.x
Subject(s) - materials science , composite material , microstructure , ceramic , composite number , lamellar structure , fracture toughness , porosity , carbide , ceramic matrix composite
Nanolaminates with a layered M N +1 AX N crystal structure (with M: transition metal, A: group element, X: carbon or nitrogen, and N =1, 2, 3) offer great potential to toughen ceramic composites. A ternary Ti 3 AlC 2 carbide containing ceramic composite was fabricated by three‐dimensional printing of a TiC+TiO 2 powder mixture and dextrin as a binder. Subsequent pressureless infiltration of the porous ceramic preform with an Al melt at 800°–1400°C in an inert atmosphere, followed by reaction of Al with TiC and TiO 2 finally resulted in the formation of a dense multiphase composite of Ti 3 AlC 2 –TiAl 3 –Al 2 O 3 . A controlled flaw/strength technique was utilized to determine fracture resistance as a function of crack extension. Rising R ‐curve behavior with increasing crack extension was observed, confirming the operation of wake‐toughening effects on the crack growth resistance. Observations of crack/microstructure interactions revealed that extensive crack deflection along the (0001) lamellar sheets of Ti 3 AlC 2 was the mechanism responsible for the rising R ‐curve behavior.