QUALITY AND CERTIFICATION
DEVELOPING RECOMMENDATIONS ON THE USE
OF AN ACOUSTIC METHOD FOR QUALITY CONTROL
OF PRODUCTS BASED ON PERICLASE, INCLUDING
A. D. Buravov,
E. Z. Kovarskaya,
and I. B. Moskovenko
Translated from Novye Ogneupory, No. 2, pp. 57 – 60, February, 2014.
Original article submitted December 11, 2013.
Results are presented from nondestructive evaluation of the properties of certain periclase-chromite products
by low-frequency acoustic methods. The results are compared to the results obtained from mechanical tests
and visual inspection. A procedure is recommended for introducing express methods of nondestructive testing
for the quality control of similar products.
Keywords: nondestructive testing, refractories, acoustic test methods, frequency of natural vibration, rate of
propagation of acoustic waves.
The task of monitoring the quality of different types of
periclase-carbon products in real time has become quite im-
portant. Monitoring such products is not significantly differ-
ent from the monitoring that is done for other products based
on periclase, but the ranges of values obtained in the moni
toring operation can differ appreciably for products which
differ in composition and are made by different technologies.
Results obtained from the experimental use of an acous
tic method that employed instruments of the “Zvuk” type 
were used to develop recommendations on preparing for and
performing monitoring of the quality of specific types of
periclase-chromite products at one of the foreign plants in
the “Magnezit” group. To determine the feasibility of using
the acoustic method to do such monitoring, we developed a
procedure for performing measurements on rectangular
periclase-chromite products K34/228/76 by using the instru
ment “Zvuk-203M.” The dimensions of these products:
length (a) = 342.9 mm; width (b ) = 228.6 mm; height
(h ) = 76.2 mm. We chose the types of vibrations that are to
be used to obtain the measurements and the corresponding
frequency ranges. Figure 1 presents a diagram illustrating the
method that was developed to measure the physico-mechani-
cal properties of K34/228/76 products with the Zvuk-203M
tester. The figure includes the initial data needed to check
rectangular products with the certified, serially produced
Zvuk-203M, which measures natural frequencies of vibra
The method was tried out at the above-mentioned factory
in the “Magnezit” group. To estimate the range of
physico-mechanical properties that can be measured and the
feasibility of using the Zvuk-203M unit for preliminary qual
ity control (flaw detection) by an acoustic method based on
the natural frequency of vibration (NFV) f, we tested certain
types of rectangular and wedge-shaped periclase and peri
clase-chromite products. Methods similar to those used for
rectangular products were developed to test the wedge-
Product samples were prepared from different batches to
measure the NFV, ratios of the measured frequencies f
calculated, and the rate of propagation of the acoustic waves
was determined . The acoustic measurements were
then used to sort out the products which had significantly dif
ferent physico-mechanical properties (f
) and had
NFV ratios that deviated from the theoretical values or the
average values for the samples. These products were subse
Refractories and Industrial Ceramics Vol. 55, No. 1, May, 2014
1083-4877/14/05501-0077 © 2014 Springer Science+Business Media New York
OOO NVF “Kerambet-Ogneupor,” St. Petersburg, Russia.
Abrasiv, a.s., Mladá Boleslav, Czech Republic.
OOO “Zvuk,” St. Petersburg, Russia.
”Gornyi” National University of Minerals and Raw Materials,
St. Petersburg, Russia.