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Near‐Net‐Shape Fabrication of Ti 3 AlC 2 ‐Based Composites
Author(s) -
Yin Xiaowei,
Travitzky Nahum,
Greil Peter
Publication year - 2007
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2007.02123.x
Subject(s) - materials science , agglomerate , composite material , fabrication , porosity , ceramic , dextrin , bending , medicine , biochemistry , alternative medicine , pathology , starch , chemistry
A porous ceramic preform was fabricated by printing a powder blend of TiC, TiO 2 , and dextrin. The presintered preforms contained a bimodal pore size distribution with intra‐agglomerate pores ( d 50 ≈0.7 μm) and inter‐agglomerate pores ( d 50 ≈30 μm), which were subsequently infiltrated by aluminum melt spontaneously in argon above 1050°C. A redox reaction at 1400°C resulted in the formation of dense Ti–Al–O–C composites mainly composed of Ti 3 AlC 2 , TiAl 3 , Al, and Al 2 O 3 , which attained a bending strength of 320 MPa, a Young's modulus of 184 GPa, and a Vicker's hardness of 2.5 GPa.