STUDY OF SINTERING POLYCRYSTALLINE
AND COMPOSITE MATERIALS BASED ON SILICON CARBIDE
IN HIGH-PRESSURE EQUIPMENT
S. P. Bogdanov,
A. P. Garshin,
N. Yu. Korableva,
and V. A. Ponomarenko
Translated from Novye Ogneupory, No. 2, pp. 23 – 28, February 2015.
Original article submitted July 15, 2014.
Results are provided for a study of sintering and some properties of new SiC-sintered polycrystalline and
SiC-composite materials. Materials are prepared by sintering silicon carbide nano- and micropowders in
high-pressure equipment. SiC powders are used both in pure form and with titanium compound nanocoatings
applied to them.
Keywords: silicon carbide, nanopowders, micropowders, clad powders, sintering, high-pressure equipment.
The start of the XXI century was marked by revolution-
ary development of nanotechnology and nanomaterials. They
are already used in all of the developed countries of the
world in the most significant fields of human activity: indus-
try, defence, the information sphere, radioelectronics, power
generation, transport, biotechnology, and medicine. Analysis
of the increase in investment, number of publications on this
theme, and rate of introduction of fundamental and research
work, make it possible to conclude that in the next twenty
years use of nanotechnology and nanomaterials will be a de
fining factor of scientific, economic, and defence develop
ment for states.
There is also a headlong increase in interest in some
structural nanomaterials. Currently nanopowders of such
compounds as Al
, SiC, B
C, WC, TiC, TiN, etc.,
are prepared. Due to their special properties these com
pounds may also be used actively for improving composite
materials for structural purposes, including hard alloys and
special oxide, nitride, and carbide ceramics.
A typical feature of nanosize powders prepared by
plasma chemistry, apart from considerable fineness, is the
significant inequality of phase composition, caused by
“quenching” of reaction products during synthesis. Crystal
lattice defects and partial agglomeration arising lead to an in-
crease in effective diffusion coefficient and mass transfer ac-
tivation, which in turn during sintering lead to an increase in
grain size and phase composition, structure inhomogeneity,
and increased material residual porosity .
In order to minimize these effects to some degree such
methods for consolidation as hot pressing, hot isostatic
sintering, and SPS-sintering [2, 3], are used. In this connec
tion there is even greater interest in high-pressure methods
[4 – 6]. An advantage of this concerns the fact that material
consolidation occurs with simultaneous action of high tem
perature and pressure for such a short time that size changes
of nanosize powder particles do not manage to occur and ma
terial compaction is guaranteed.
RESEARCH AIM AND OBJECTS
The aim of the work is to determine the sintering capac
ity of silicon carbide nano- and micropowders in the
sintering temperature and pressure range for sintering com
posite materials based on cubic boron nitride and diamond
[2 – 6], and also to study the effect of cladding on some
sintered material properties: density, microhardness, poros
ity, and wear resistance.
Refractories and Industrial Ceramics Vol. 56, No. 1, May, 2015
1083-4877/15/05601-0066 © 2015 Springer Science+Business Media New York
FGBOU VPO St. Petersburg State Technological Institute (Tech
nical University), St. Petersburg, Russia.
FGBOU VPO St. Petersburg State Polytechnic University, St. Pe
OOO VIRIAL, St. Petersburg, Russia.