PERFORMANCE PARAMETERS OF TiN – AlN CERAMIC END SEALS
FRICTIONALLY COUPLED TO STEEL
T. V. Mosina
and V. V. Gusev
Translated from Novye Ogneupory, No. 5, pp. 40 – 43, May, 2006.
Original article submitted February 9, 2006.
Performance parameters (friction moment, temperature in the friction zone, and surface roughness parameter
) of friction couples 50% TiN + 50% AlN (composite 1 ) steel and 25% TiN + 75% AlN (composite 2 ) used
as end seal components of belt conveyor rollers have been determined experimentally.
Operating reliability and durability are the main quality
indicators of any industrial machinery. Extending the service
life of wearable parts has been and continues to be a chal-
lenging problem for modern mechanical engineering. The
durability of many machines, especially those operating in
heavy-duty and abrasive-attack conditions (in mining and
transportation engineering), depends, in many respects, on
the performance of the bearing end seals in rotating shafts
prone to damage due to wear. Experience gained in the use of
industrial machinery has shown that the premature wear of
engineering components may frequently result from poorly
designed sealing assemblies or improperly matched materi-
als for friction couples.
The ever-increasing requirements on durability and reli
ability of modern machinery necessitate the development of
new materials with superior wear-resistance properties. Ma
terials capable of meeting these stringent requirements are
engineering ceramics which have recently gained ever-in
creasing acceptance in mechanical engineering. Until now,
little (if any) study on the operability of borderline-lubricated
ceramic end seals has been conducted.
Experimental method. A specialized stand was deve
loped for testing end seals. The stand was a friction testing
machine; its schematic diagram are shown in Fig. 1. It con
sists of a traveling carriage 1 and a rolling bearing 2 into
which a test assembly 3 is fitted and rotated by a roller 4.
Roller 4 is set in motion by means of belt transmission from
a motor 7; 5 and 6 are accessory pulleys. Radial load on the
bearing tested is transmitted by a screw 8 which passes
through a nut 9 rigidly fixed to the stand basement. Screw 8
compresses a spring 10 which exerts force on the bearing; the
compressive force is measured by a strain-gauge beam 11.
The test assembly (Fig. 2) was a dismountable device fitted
with two end seals. Left- and right-side roll cages 12, linked
together by a ring 10 and tightly held by screws, make up a
rotor which is mounted on bearings 4. The bearing cavities
are protected by lids 3. Shaft 1 on rolling bearings 2 is
mounted on a traveling carriage; it is prevented from rotation
by a strain-gauge beam which is fitted into a slot 13 and
fixed with a screw 14. Bearings 4 are held in bores in the
Refractories and Industrial Ceramics Vol. 47, No. 3, 2006
1083-4877/06/4703-0175 © 2006 Springer Science+Business Media, Inc.
I. N. Frantsevich Institute for Problems of Materials Science, Na
tional Academy of Sciences, Kiev, Ukraine; Donetsk National
State Technical University, Donetsk, Ukraine.
Fig. 1. Schematic diagram of a stand for testing end seals (for nota
tions see text).
123456 7 8 9 10 11 12 15 13 14
Fig. 2. Schematic diagram of a test assembly (for notations see