SCIENTIFIC RESEARCH AND DEVELOPMENTS
-ROLLING IN A VACUUM — AN EFFECTIVE METHOD
FOR PREPARING CERMET AND INTERMETALLIC MATERIALS
V. N. Chernyshev
Translated from Novye Ogneupory, No. 10, pp. 42 – 44, October 2007.
Original article submitted September 25, 2007.
Results are presented for experiments in studying SHS-rolling realized under conditions of rolling in a vac
uum. The starting materials used are powder mixtures of the systems Ti–C, Ti–Al, Ti–C–N–Ni. Optimum heat
treatment regimes and compaction of the starting mixtures are determined and parameters are studied for com
bustion and subsequent plastic deformation in a vacuum, test specimens are prepared in the form of strips of
TiC and TiAl and a hard alloy based on TiC and TiN with porosity from 3 to 65%. The new method will make
it possible to prepare articles made of synthetic hard materials in the form of strip, sheets, bars and other me
Among SHS-technologies, currently used in order to pre-
pare articles made of synthetic hard materials, the most im-
portant place is occupied by processes based on combined
SHS with different forms of hot working, i.e., compaction,
extrusion, and rolling. The most widely studied processes are
SHS-compaction, that is in practical use, and SHS-extrusion.
There are few data for studying and assimilating the process
of SHS-rolling, that is of interest from the point of view of
producing articles for different purposes in the form of strips,
sheet, bars of different cross section, and pipes, and in indi
vidual cases finished articles.
In order remove impurities and protect hot products of
thermal synthesis from oxidation a considerable effect may
achieved by SHS-rolling in a vacuum. There is a well-known
, in which a version of realizing this process is
proposed. However, in the opinion of the author it exhibits a
number of disadvantages: it does not provide sufficient pro
ductivity, it is difficult to implement under industrial condi
tions, and it exhibits limited production possibilities. Under
the leadership of the author over a number of years work has
been carried out on studying hot rolling in a vacuum and cre
ation of special equipment. The experience accumulated has
made it possible to perform experiments for studying and
practical application of the SHS-rolling method in a vacuum.
The work was carried out with the aim:
– of developing technology for performing the SHS pro-
cess under conditions of rolling in a vacuum;
– of revealing the main features of the process;
– of studying the possibility of preparing strip made of
cermet and intermetallic materials.
Exothermic mixtures were selected as study materials:
Ti–C, Ti–Al, Ti–C–N–Ni, calculated from conditions for pre
paring the corresponding nonstoichiometric titanium carbide
TiC, intermetallic TiAl and complexly alloyed hard alloy
based on titanium carbide and nitride.
Powder materials with a fineness from 50 to 100 mm
were used for preparing mixtures. The starting components
were mixed in ball with a charge weight ratio to that of the
balls equal to 0.3. The mixing time was varied from 5 to 30 h.
Studies were carried out in a vacuum rolling mill 155
(Fig. 1). The mill of a roll-chamber type has vacuum cham
bers connected successively: loading, heating (continuous
type with heater unit), working (with rolls 155 mm in diame
ter), cooling and unloading. The mill is fitted with a transpor
Refractories and Industrial Ceramics Vol. 48, No. 5, 2007
1083-4877/07/4805-0359 © 2007 Springer Science+Business Media, Inc.
Self-propagating high-temperature synthesis.
OOO Intermet Inzhiniring, Russia.
US Pat. No. 4642218, Roy W. Rice, “Hot rolling of self propagating