STUDY OF SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS
IN THE Ti–TiO
–Al–AIR SYSTEM AND PREPARATION
OF CERAMIC MATERIALS BASED ON TITANIUM NITRIDE
Yu. I. Strokova,
A. A. Gromov,
M. Yu. Ponomareva,
and T. A. Khabas
Translated from Novye Ogneupory, No. 9 pp. 31 – 34, September 2009.
Original article submitted April 28, 2009.
Mechanisms for titanium nitride formation during burning in air of a mixture of coarse titanium powder and
its dioxide with addition of aluminum powder, and formation of the phase composition of ceramic materials
prepared by sintering combustion products in a hydrogen atmosphere, are considered. Material of the compo
sition titanium nitride – corundum is prepared.
Keywords: ceramic material, self-propagating high-temperature synthesis (SHS), nitride formation, sintering.
Ceramics and composites based on titanium nitride and
corundum are used as coatings for cutting and processing
tools, for grinding precious stones, in the manufacture of
heat-resistant materials, wear-resistant coatings, and also mi-
croelectronics due to the high strength, chemical stability,
heat resistance and wear resistance of titanium nitride[1 – 3].
One method for achieving the required properties of ce
ramic materials is creation of a complex phase composition.
The method of self-propagating high-temperature synthesis
(SHS) is a universal method for synthesizing refractory ma
terials . In essence SHS includes self-propagation of an
exothermic reaction in materials, with a capacity for the re
lease of chemical energy, with formation valuable end con
densed products; SHS is accompanied by strong self-heating
of products (normally to 1000 – 3000°C) and bright lumines
cence. The process occurs with local action within a system
of a short thermal pulse and it subsequently occurs in the
form of a combustion wave without supply energy from out-
side, as a result of the natural heat liberated. One area for de-
velopment of SHS technology in recent years has been prep-
aration of nitrides in air at atmospheric pressure, that does
not require complicated equipment formulation for synthesis
. The present work is establishment of the features of syn
thesis and production aspects of forming ceramic composites
based on titanium nitride and aluminum oxide by SHS in the
Self-propagating high-temperature synthesis in the
–Al–air system. Micron-size powders of Ti, TiO
and Al, whose properties are provided in Table 1, were used
as the SHS reagents. In order to carry out synthesis in air
Refractories and Industrial Ceramics Vol. 50, No. 5, 2009
1083-4877/09/5005-0359 © 2009 Springer Science+Business Media, Inc.
Tomsk Polytechnic University, Tomsk, Russia.
TABLE 1. Properties of Original Powders — SHS Reagents
Powder Average surface particle size a
*, mm Bulk density r, g/cm
Specific surface S
by BET, m
/g Particle shape
Ti 630 1.19 0.0023 Irregular and rough surface
80 0.54 0.024 Spherical
Al (PAP-2**) 40 0.44 5.4 Flaky
* For spherical particles a
** Aluminum pigment powder.