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Synthesis and Sintering Characteristics of TiC – Ni – Ti – (Al) Nanocomposites

Published online by Cambridge University Press:  21 March 2011

Kai Vohwinkel  and
Rasit Koc
Kai Vohwinkel
Affiliation:
Department of Mechanical Engineering and Energy Processes, Southern Illinois University at Carbondale, Carbondale, IL 62901, USA
Rasit Koc
Affiliation:
Department of Mechanical Engineering and Energy Processes, Southern Illinois University at Carbondale, Carbondale, IL 62901, USA
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Abstract

The sintering behavior of submicron / nanosize TiC powders was investigated. The TiC powders (31 wt.% carbon) are synthesized from a carbon coated precursor and have excess carbon content. Ti, Ni and Al powders were added to have in-situ intermetallic binders for sintering. The composition TiC-5 wt.% Ti (pellet 1) shows pure TiC in the XRD analysis after sintering. The composition TiC-30 wt.% Ni3Al (pellet 3) shows the formation of the liquid phase Ni3Al. No liquid phase can be clearly identified in the XRD pattern of pellet 2 (TiC-30 wt.% Ni3Ti). However the SEM micrograph of pellet 2 shows similarity to the SEM image of pellet 3 concerning the formation of liquid phase.

Pellets 1 and 2 show densifications of 100 % TD (theoretical density), whereas pellet 3 is only 90 % TD. Pellet 3 has the highest hardness (2511 HV) and fracture toughness (12.08 MPa m1/2).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y3.22
Copyright
Copyright © Materials Research Society 2001

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References

[1] “Sintering properties of submicron TiC powders from carbon coated titania precursor”, Koc, R., Meng, Chang, Swift, G. A., J. of Materials Science, 35, 3131–3141, 2000 Google Scholar
[2] “Development of high toughness, high strength aluminide-bonded carbide ceramics” Becher, Paul F., Plucknett, Kevin P., Tiegs, Terry N., Schneibel, Joachim H. and Subramanian, Ramesh, Advanced Industrial Materials (AIM) Program, Annual Progress Report, FY 1996 Google Scholar
[3] Koc, R. and Glatzmaier, G., U. S. Patent Ni: 5,417,952 (1995)Google Scholar