PROCEDURE FOR STUDYING THERMOPHYSICAL PROPERTIES
OF CERAMIC MATERIALS AT HIGH TEMPERATURE
S. A. Anuchin
and P. A. Stepanov
Translated from Novye Ogneupory, No. 5 pp. 41 – 44, May 2009.
Original article submitted February 17, 2009.
A comprehensive procedure is presented for determining thermophysical properties (TPP) of ceramic materi
als in the range 300 – 1500 K by quasi-stationary and non-stationary study methods. Work is provided for a
search of sample materials with known TPP at high temperature that may be recommended for checking a set
of TPP determinations. In an automatic system for determining material TPP the advantages of using contem
porary software and mathematics of the reverse problem of thermal conductivity coefficients are realized.
Keywords: ceramics, thermophysical properties (TPP), high temperature, automated system, thermal conduc
tivity, heat capacity.
Known methods and facilities for thermophysical studies
do not exhibit sufficient precision and productivity up to
1500 K. As a rule certification of a material with respect to
thermophysical properties (TPP) requires from 50 to
100 man hours of working time in the testing section. The
maximum level of experimental temperature varies from
800 – 1200 K. existing reference data are incomplete, they
are aged, they do not contain information about new materi-
als and their accuracy at high temperatures does exceed 20%.
In view of this it is important to expand the temperature
range, to reduce errors in determining TPP of ceramic mate
rials and simultaneously increase productivity. The com
bined development of methods and facilities for automating
thermophysical studies is an important scientific and techni
The aim of experimental and theoretical work was to in
crease the accuracy of determining TPP for ceramic materi
als with a simultaneous increase in productivity and expan
sion of the range of experimental temperatures to the level of
1500 K due to introduction of new research methods, algo
rithms and software. A comprehensive method has been de
veloped for determining the TPP of ceramic materials for
aerospace purposes by quasi-stationary and non-stationary
study methods, based on selection of the shape and dimen
sions of experimental specimens, heating rate and experi
ment duration, and also algorithms for automated tests.
In order to determine TPP for ceramic materials within
the composition of a self-automated unit (AKO TFSM) four
independent study methods have been realized: quasi-sta-
tionary thermal regime (QTR), pulsed heat flow (PHF),
non-stationary thermal regime (NTR) and non-stationary re-
sistive heating (NRH). The QTR (flow) method is intended
for determining thermal conductivity, thermal diffusivity,
and specific heat capacity of ceramic materials in the range
300 – 1200 K. This method is valid for Fo ³ 0.5, which pro-
vides the onset of a regular thermal regime . The basis of
the method is solution of the linear reverse thermal conduc-
tivity problem (RTP) for a QTR of an unbounded composite
plate with two-sided heating by a constant heat flux. The
PHF method is intended for determining thermal conductiv
ity, thermal diffusivity, and specific heat capacity of solid
non-electrical conducting materials in the range
Refractories and Industrial Ceramics Vol. 50, No. 3, 2009
1083-4877/09/5003-0201 © 2009 Springer Science+Business Media, Inc.
FGUP ONPP Tekhnologiya, Obninsk, Kaluga Region, Russia.
Fig. 1. Layout of the measurement assembly for determining TPP
by a quasi-stationary method: 1 ) heater; 2 ) test material plate;
3 ) heat insulation plate; 4) thermocouples.