Production of Ni3Ti?TiC x intermetallic-ceramic composites employing combustion synthesis reactions |
| |
Authors: | Douglas E Burkes Guglielmo Gottoli John J Moore and Hu Chun Yi |
| |
Affiliation: | (1) Metallurgical and Materials Engineering Department, Institute for Space Resources, Colorado School of Mines, 80401 Golden, CO;(2) Department of Chemical and Biomolecular Engineering, University of Melbourne, 3010 Melbourne, Victoria, Australia;(3) Advanced Materials and Combustion Laboratory, Guigne International Ltd., A1L 1C1 St. John's, NL, Canada |
| |
Abstract: | Combustion synthesis (CS) of nickel, titanium, and carbon (graphite) reactant particles can result in NiTi−TiC (stoichiometric)
or Ni3Ti−TiC
x
(nonstoichiometric) composites. Since NiTi exhibits both superelasticity and shape memory properties while Ni3Ti does not, it is important to understand the SHS reaction conditions under which each of these composite systems may be
synthesized. The stoichiometry of TiC
x
, for which 0.3≤x≤0.5, has an important controlling effect on the formation of either Ni3Ti or NiTi;i.e., formation of TiC0.7 results in a depletion of titanium and formation of Ni3Ti. This deficiency should be considered when developing the SHS reaction. This article examines the SHS conditions under
which Ni3Ti−TiC
x
composites are produced. Ignition, combustion and microstructure characteristics of nickel, titanium, and carbon (graphite)
particles were investigated as a function of initial relative density and thermophysical properties of the reactant mixture.
Combination of the thermophysical properties and burning velocities controlled TiC
x
particle size, yielding a dependence of particle size on cooling rate. Theoretical calculations were performed and are in
good agreement with the experimental data presented.
Guglielmo Gottoli, formerly Graduate Research Assistant, Metallurgical and Materials Engineering Department, Institute for
Space Resources, Colorado School of Mines |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|