FEATURES OF ADHESIVE TECHNOLOGY
FOR SILICON NITRIDE CERAMIC COMPONENTS
T. F. Baranova,
I. N. Kurskaya,
and I. L. Shkarupa
Translated from Novye Ogneupory, No. 11, pp. 45 – 50, November 2010.
Original article submitted January 27, 2010.
A method is provided for joining (gluing) individual silicon nitride components used in the preparation of
structural objects of different types of silicon nitride ceramic with a broad range of porosity (from zero to
~23%). The method includes preparation of an adhesive mixture based on silicon nitride, successive applica
tion of the mixture to component surfaces being joined, and firing of the joined object at 1000°C with expo
sure for 2 h. The glued joint is distinguished by high adhesive strength, which makes it possible to prepare ob
jects of complex structure by this method.
Keywords: reaction-sintered silicon nitride (RSSN), hot-pressed silicon nitride (HPSN), adhesive mixture,
aluminoboron phosphate (ABPB) and aluminochromium phosphate (ACPB) binder, glued joint.
Adjustment of manufacturing technology for ceramic ob-
jects of complex construction (for example presence of joints
in engine components, the length of thermocouple sheaths,
chlorine conduits, etc.), operating with thermal cycling loads
and in chemically active media, continues to remain impor-
tant at the present time.
A reliable method for manufacturing large objects is glu-
ing of individual components. This method for manufactur
ing silicon nitride assemblies and components for aero en
gines, thermocouples and chlorine conduits, operating in
molten aluminum, is a subject of much research both in our
country and abroad. Particular attention is devoted to meth
ods for gluing silicon nitride components in Japan [1 – 7].
One method of joining components in the form of tubes
and disks is sintering a glue composition under pressure in a
connecting joint, containing up to 98% of silicon nitride;
here 35% of the particles have a size of 8 – 120 mm and 65%
are less than 50 mm. A binder used is a mixture of
carbomethyl cellulose and oleic acid. Sintering of the adhe
sive is carried out under a pressure of 70 kgf/cm
in an argon
atmosphere at 1250°C for 1 h . A disadvantage of this
method is use of special equipment for its accomplishment.
In  in order to obtain a glued joint with high strength
on gluing silicon nitride components an adhesive composi
tion has been used of CaF
(1 – 50%) with kaolin
(50 – 98%). Heating was performed in a nitrogen atmosphere
at 1400 – 1500°C. Here gaseous fluorine is liberated under
whose action there is significant silicon nitride surface etch-
ing and corrosion. Here reaction calcium and kaolin reaction
products formed impregnated the surfaces being joined and
after cooling provided increased joint strength and thermal
shock resistance. The ultimate strength in bending of speci-
mens (3 ´ 3 ´ 20 mm), cut from a glued preform, was up to
50 MPa. It should be noted that this evaluation method (ac
cording to strength in bending) is adopted in all of the Japa
nese patents considered by us.
In research  for gluing sintered components of internal
combustion engines (ICE) adhesive compositions are used
based on powders of Si
, MgO followed treatment
in a nitrogen atmosphere at a temperature close to the mix
ture melting temperature (1620 – 1800°C). This technology
requires considerable energy expenditure.
An adhesive and method is also known  for sintered
silicon nitride; the adhesive composition consisted of
5 – 23% magnesium oxide, 20 – 30% aluminum oxide,
40 – 60% silicon oxide, and 26 – 65% silicon nitride powder
(average grain 1.5 mm). The surfaces being glued after adhe
sive application were heated in the range 1500 – 1700°C in
an inert gas atmosphere. Disadvantages of this adhesive and
joining method are the high labor consumption connected
with heat treatment.
A method of joining reaction-sintered silicon nitride
(RSSN) is considered in  by means of an adhesive compo
sition of silicon nitride powder containing up to 15% oxygen
and addition of aluminum or yttrium oxide powder. Struc
Refractories and Industrial Ceramics Vol. 51, No. 6, March, 2011
1083-4877/11/5106-0437 © 2011 Springer Science+Business Media, Inc.
FGUP Salyut, Moscow, Russia.
FGUP ONPP Tekhnologiya, Obninsk, Kaluga Region, Russia.