PERICLASE-CARBON REFRACTORY REINFORCEMENT
WITH CARBON FIBERS
I. D. Kashcheev,
K. G. Zemlyanoi,
S. A. Pomortsev,
A. A. Ryaplova,
and Yu. A. Borisova
Translated from Novye Ogneupory, No. 12, pp. 18 – 20, December 2015.
Original article submitted July 13, 2015.
Possibilities are considered for using carbon fibers as a reinforcing elements within the structure of periclase-
carbon refractories. Laboratory research results are provided.
Keywords: carbon fibers, reinforcement, periclase-carbon refractories, strength, thermal shock resistance.
Currently carbon fibers are being exploited intensively in
view of good values of elasticity modulus and strength, and
used extensively in structural materials as a reinforcing filler.
With respect to engineering properties (strength, elasticity
modulus, thermal shock resistance) composites with a poly-
mer matrix surpass other carbon composites .
Introduction of fibers into a refractory charge provides
three-dimensional bulk strengthening and an increase in ma-
terial endurance, reducing shrinkage during heat treatment,
as a result of which there is a significant improvement in
thermal shock resistance and impact strength, and as a conse
quence there is an increase in refractory life [2 – 4].
Starting materials for performing laboratory studies
fuzed periclase containing not less than 97 wt.% MgO
in an amount of 88 – 91%; carbon fiber VMN-4 (TU
48-20-155–90), graphite GÉ-1 (GOST 17022), and ethylene
glycol (GOST 19710) 1.3%; phenolic binding powder grade
P-050 (TU 6-05751768-35–94) 3.0%. The content of graph
ite and fibers in a charge was varied in accordance with Ta
ble 1. Fiber length was within the limits from 0.9 to 4 mm
with a predominant size of 0.92 mm (Fig. 1).
Specimens 50 mm in diameter and 40 mm thick were
prepared for research. Fiber was introduced into a charge in
an amount of 0.05 to 0.2% by two methods:
– by preliminary mixing in ethylene glycol with subse-
quent introduction into a periclase-graphite charge (composi-
– introduction in dry form into periclase moistened with
ethylene glycol (compositions 9 and 10).
Graphite content in a charge was varied from 4.0 to
Molding mix preparation was carried out in an R02 labo
ratory planetary mixer. The overall molding mix preparation
duration was not less than 15 min. The mix was held for 2 h,
Refractories and Industrial Ceramics Vol. 56, No. 6, March, 2016
1083-4877/16/05606-0641 © 2016 Springer Science+Business Media New York
FGAOU VPO Ural Federal University, Ekaterinburg, Russia.
OOO Ogneupor, Magnitogorsk, Russia.
OAO Magnitogorsk Metallurgical Combine, Magnitogorsk, Rus
The composition of periclase-carbon specimens corresponded to
the content of components in a charge of objects for lining a
Fig. 1. Carbon fibers. Oblique reflected light.