Formation of Al2O3–TiC Composite Nano‐Particles Synthesized from Carbon‐Coated Precursors

The formation of nano-sized alumina-titanium carbide (Al 2 O 3 -TiC) composite powders from a carbon-coated titanium dioxide-aluminum (TiO 2 -Al) mixture was investigated. The carbon-coated TiO 2 -Al mixture altered the mechanism of the reaction, compared with standard mixtures, to produce high-quality nano-sized Al 2 O 3 -TiC powders. Data synthesized from intermediate temperatures indicate that these products form via Ti 2 O 3 and Al 3 Ti. TEM images of the Al 2 O 3 -TiC powders showed fine size (50-100 nm), narrow size distribution, and lack of agglomeration. DSC data for the carbon-coated TiO 2 -Al mixture showed a single endothermic and four successive weak exothermic reactions as the carbon coating moderated the heat release during the reaction.

[1]  J. B. Holt,et al.  Synthesis and Densification of Oxide‐Carbide Composites , 2008 .

[2]  R. Koç,et al.  Synthesis of Submicrometer Titanium Carbide Powders , 2005 .

[3]  T. Xia,et al.  Structure Formation in the Combustion Synthesis of Al2O3–TiC Composites , 2004 .

[4]  R. Koç,et al.  Formation studies of TiC from carbon coated TiO2 , 1999 .

[5]  B. Derby,et al.  Selfpropagating high temperature synthesis of ceramic materials , 1997 .

[6]  B. Derby,et al.  The formation of TiC/Al2O3 microstructures by a self-propagating high-temperature synthesis reaction , 1996, Journal of Materials Science.

[7]  M. Rahaman.  Ceramic Processing and Sintering , 1995 .

[8]  S. Rhee,et al.  Effect of precursors on the combustion synthesis of TiC-Al 2 O 3 composite , 1994 .

[9]  A. Krell,et al.  TiC-strengthened Al2O3 by powder tailoring and doping procedures , 1993 .

[10]  T. Wada,et al.  High‐Pressure Self‐Combustion Sintering of Alumina‐Titanium Carbide Ceramic Composite , 1990 .

[11]  A. Virkar,et al.  Pressureless-sintered Al2O3-TiC composites , 1988 .

[12]  S. Burden,et al.  Comparison of Hot-Isostatically-Pressed and Uniaxially Hot-Pressed Alumina-Titanium Carbide Cutting Tools , 1988 .

[13]  Minyoung Lee,et al.  Rapid rate sintering of Al sub 2 O sub 3 -TiC composites for cutting-tool applications , 1988 .

[14]  R. Abramovici.  Composite ceramics in powder or sintered form obtained by aluminothermal reactions , 1985 .

[15]  B. Ilschner,et al.  Fracture behaviour of composites based on Al2O3-TiC , 1980 .