ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 5, pp. 539−546. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © N.A. Rudenskaya, G.Ps. Shveikin, M.V. Rudenskaya, I.V. Nikolaenko, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 5,
INORGANIC SYNTHESIS AND INDUSTRIAL
Modiﬁ cation of a Structure
of Cermet Coatings Co–Ni–Cr–B–Si–TiB
in Their Fusion
N. A. Rudenskaya
, G. Ps. Shveikin
, M. V. Rudenskaya
, and I. V. Nikolaenko
Science and Technology Park of Belarusian National Technical University “Politekhnic,”
ul. Ya. Kolasa 24, k. 34/1, Minsk, 220013 Belarus
Institute of Solid State Chemistry, Urals Branch of Russian Academy of Sciences,
ul. Pervomaiskaya 91, GSP, Yekaterinburg, 620990 Russia
St. Petersburg State Polytechnical University, ul. Politekhnicheskaya 29, St. Petersburg, 195251 Russia
Received May 19, 2014
Abstract—Peculiarities of variation in hardness and structure of the matrix alloy, Stellite, depending on a
composition of the ceramic-metal system were found out in studying the effects of hardening of the base layer
of cermet coatings. A new type of structure of matrix alloy, which was called “meshwork,” were discovered and
examined as well as a new type of inclusions: plasma conglomerates, in which a fragmentary structure reﬁ nement
was found. Under the conditions of the plasma stream new composite coatings of multilayer structure characterized
by improved performance properties were produced.
Coatings based on self-ﬂ uxing alloys are widely used
in industry and, nevertheless, they remain poorly studied.
By the structure such coatings can be uniformly-tough-
ened, laminated, and gradient . Composition of these
coatings is multicomponent that complicates their study.
, systems Ni–Cr–B–Si, Co–Cr–B–Si are highly
sensitive to changes in thermal processing parameters that
is manifested by variation in their structure and properties.
This paper summarizes the results of studies of fused
coatings based on self-ﬂ
uxing alloys PG-10K-01
(Stellite) with boride components, which are used as
reinforcing additives to improve wear resistance of
The composite coatings was applied by plasma
method in an installation WB-15 followed by fusing in
a furnace. Mechanical mixtures of powders of borides
and self-ﬂ uxing alloys PG-10K-01 (–Ni–Cr–B–Si) of
40–100 m dispersion were used as a original material.
, which are the most indifferent to the
self-ﬂ uxing alloys compared with CrB
, were selected as
refractory components of the cermet coating. Titanium
borides were used in the form of a polydisperse system
with narrow fractional composition. The content of the
hardening phase was varied from 10 to 60 wt %.
The microstructure of the coatings was studied by
metallographic (Neophot-21) and microprobe (LEO
1455 VP, Jeol) methods. Layerwise study of coatings
composition over the cross section was carried out
using integral and local techniques of microstructure
evaluation. Microhardness of the coating phases was
evaluated in a device PMT-3. Wear resistance of the
coatings was determined by the standard method (State
Standard GOST 17367-71) on a machine X4-B. Tests
were performed layer by layer in accordance with the
results of metallographic examinations, therewith the
thickness of the lower layer of the produced coatings
was within 140–260 m.