EFFECT OF TITANIUM NITRIDE COATING ON STRESS
STRUCTURAL INHOMOGENEITY IN OXIDE-CARBIDE CERAMIC.
PART 5. A COMBINED LOAD OPERATES
M. A. Volosova,
S. N. Grigor’ev,
and V. V. Kuzin
Translated from Novye Ogneupory, No. 4, pp. 49 – 53, April 2015.
Original article submitted March 3, 2015.
The effect of a titanium nitride coating on stress structural inhomogeneity in oxide-carbide ceramic under ac
tion of a combined load is studied. A considerable effect of a coating on properties determining stress struc
tural inhomogeneity within ceramic is revealed. A requirement is noted for considering stress structural
inhomogeneity in designing objects from oxide-carbide ceramic with a coating.
Keywords: ceramic, coating, stress structural inhomogeneity, heat flow, heated condition, structural element.
The aim of the study is to analyze the effect of a titanium
nitride coating on stress inhomogeneity in the surface of ox-
ide-carbide ceramic structural elements under action of a
combined load. Solution of this scientific problem will sup-
plement features of the effect of force loads on the
stress-strained state of ceramic materials performed in
[1 – 5] and having important engineering application [6, 7].
The procedure for revealing and analyzing structural
inhomogeneity of stresses s
, and stress intensity
within the surface layer (surface) of ceramic structural ele
ments under action of an external load is provided in .
More detailed aspects of this procedure are provided in
[9 – 12].
RESULTS AND DISCUSSION
We consider the main results of numerical experiments
within which plates of the systems (TiC–MgO–Al
–SCh32 (system No. 1) and (TiC–MgO–Al
(system No. 2) were loaded with a combined load: a concen
trated force F = 0.01 N; a distributed load P =4´ 10
heat flow Q = 2.0 ´ 10
. Heat removal was accom-
plished into the atmosphere with a constant factor
·deg) from surfaces free from heat flow.
It was established that under action of a combined load
plates of the ceramic systems in question deform by a similar
scheme, i.e., a “flattened” grain is impressed into matrix. The
degree of plate elastic deformation for the two types of ce-
ramic differs considerably. Within a plate of ceramic system
No. 1 values of CP displacement in a horizontal direction ex
ceed values of their vertical displacements by a factor of 5.9,
but for system No. 2 by only a factor of 2.2.
Such a difference of the effect of a titanium nitride coat
ing on plate deformation governs the difference in stress
inhomogeneity in a surface layer of oxide-carbide ceramic
structural elements. Features are analyzed sequentially for
the change in stresses s
, and s
at CP of the sur
face of different structural elements for ceramics of both sys
tems under action of a combined load.
Stress structural inhomogeneity in a grain surface layer.
In this surface layer of ceramic of system No. 1 stresses s
which vary in the range 462 MPa, i.e., from –77 at
CP10 to 385 MPa at CP2 with average value
= 117.1 MPa and standard deviation s = 128.21 MPa.
change sign twice: between CP6 – CP7 and
CP12 – CP13. A TiN coating reduces the range of change in
within this surface to 287 MPa, i.e., from –96 at CP10 to
191 MPa at CP2 with s
= 49.8 MPa and s = 96.97 MPa.
Refractories and Industrial Ceramics Vol. 56, No. 2, July, 2015
1083-4877/15/05602-0197 © 2015 Springer Science+Business Media New York
Parts 1 – 3 published in Novye Ogneupory Nos. 8, 10, and 12
(2014), and Part 4 in No. 2 (2015).
FGBOU VPO Moscow State Technological University Stankin,