CUMULATIVE SYNTHESIS OF SUPERHARD COATINGS

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CUMULATIVE SYNTHESIS OF SUPERHARD COATINGS
S.A. Kinelovskii1,4, S.A. Gromilov 2,4, M.A.
Korchagin3, Yu.N. Popov4, and K.K. Maevskii1   1-
Lavrent'ev Institute of Hydrodynamics of Russian
Academy of Sciences 2 - Nikolaev Institute of
Inorganic Chemistry of Russian Academy of
Sciences 3- Institute for Solid State Chemistry
and Mechanochemistry of Russian Academy of
Sciences 4 - Novosibirsk State
University e-mail konstantinm_at_hydro.nsc.ru
EPNM2012 May 25, 2012, Strasbourg, France
This work was supported by the Russian Foundation
for Basic Research (project No. 10-03-00527)
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CUMULATIVE SYNTHESIS or SHAPED CHARGE SYNTHESIS
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Area of the forming of cubic phase ß-WC on the
plane of phase States of tungsten-carbon.
Area of the forming of cubic phases of TiC on
the plane of phase States of titanium-carbon.
S. A. Kinelovskii, K. K. Maevskii Simple Model
for Calculating Shock Adiabats of Powder
Mixtures Combustion, Explosion, and Shock Waves,
Vol. 47, No. 6, 2011
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Grinding surface on steel using mixture of
W-Sibunit-Co
Sample construction staging area between the
surface and the unperturbed steel matrix
(W 1,1 C) 20 (wt.)Co
mechanically activated composites 30 (wt.) (WC
30(wt.)TiC)/70(wt.) (Ni Cr)
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For the mixture W C Co micro hardness of
surface layer Hv 13 20 GPa for a single
evaporation on steel target.
For the composition WC TiC (Ni-Cr) micro
hardness of surface layer Hv 10 22 GPa for a
single evaporation on to steel target. (pure
steel HV 1,1 GPa). Cover fixed cubic phase
based on chromium (Cr), absent in the original
mixture.
The use of mechanically activated 30 (wt.) (WC
30(wt.)TiC)/70(wt.) (Ni Cr) composites for
cumulative deposition onto titanium substrate
automatically resulted in formation of a
functionally graded coating in which the
near-surface layer was TiC-rich while the inner
layers, WB-rich.
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Consider the following case where new phases are
formed in contact with the surface of the
particle flux cumulative targets. When the
cumulative particle flux with metal obstacle on
the surface of obstacle may to form a kind of
layer - covering. On the one hand, this layer can
contain any phase synthesized under collapsing
shape charge. On the other hand, the interaction
of particles with the material obstacle possible
synthesis of new phases and then coating is
integrated in the crystal lattice. In this case,
one may speak of cumulative synthesis.
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Carbon (C) ammonium nitrate (NH4NO3) in
titanium target, ? 45?
(111) c
(200) c
Intensity
(101) g
(100) g
(002) g
2?, degree
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Measuring micro hardness
For lining of mixture BNH4NO3 mixture (1 2 by
volume, a 200 ) the average surfaces
microhardness equals 18GPa and maximum value
39.55 GPa (from here onwards, the load 200 g)
when you go to the triple interaction of these
values were 39.0, respectively, and 44.5 GPa.
For mixtures of graphite NH4NO3 transition to
three-fold interaction has led to an average
micro hardness 29.5 GPa, maximum 35.4 GPa. In the
search for other mixed trains to shaped charge
lining, graphite was replaced by sibunit. -Use a
mixture of sibunit NH4NO3 (1 2 by volume) has
the average value of micro hardness layer 41.2
GPa at maximum height 41.9 GPa, suggesting a high
degree of homogeneity of formed high solid layer.
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Decomposition of precursor shaped charge
currents and the synthesis of new compounds
mixture of powders (TiB2B4C(Ti 2B)W)
? TiB2, ß-WB, W2B, W
Intensity
Inset shows changing of diffraction pattern after
grinding samples
2?, degree
Roentgen-phase analysis showed the presence of
four crystalline phases in terms of elementary
cells (EC) close to the TiB2, ß-WB, W2B, W.
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Decomposition of precursor shaped charge
currents and the synthesis of new compounds
mixture of powders (TiB2B4CW)
? TiB2, ß-WB, W2B, W
I, int./c
I, int./c
At the top curve insert shows the classification
of fundamental diffraction lines detected phases,
on the bottom curve - depth-variation of
phase-change.
2?, degree

2?, degree
Analysis of the results shows that are used with
collapsing lining pressure and temperature in
this case is insufficient to break the compound
TiB2 practically all of diboride titanium
saved. Phase B4C all decays and freed boron forms
two phases of boride of tungsten.
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Estimation of pressure and temperature to be used
in shaped charge currents for some mixtures
P, Gpa
In these experiments, received coverage on
titanium, micro hardness (Hv 42 Hpa) is
significantly higher than the micro hardness
phases of the borides of titanium and tungsten