a3)595*! ! !
a3)595*! ! !
a3)595*! ! !
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stu-s Sromebi – TRANSACTIONS OF GTU – ТРУДЫ ГТУ № 2 (484), 2012<br />
reziume: gamokvleulia Al2O3 − formirebadi optimaluri Sedgenilobis, gansakuTrebiT<br />
mxurvalmedegi Senadnobebis maRaltemperaturuli Jangvis kinetika. stabiluri fazebis difuzuri<br />
barierebisagan Semdgari proteqtoruli oqsiduri Sris zrdis procesis aRweris<br />
mizniT mosinjul iqna evansis kinetikuri gantoleba da aracxadi kinetikuri gamosaxulebis<br />
axali gantoleba. am gantolebaTa safuZvelze miRebulia saangariSo formulebi, romelTa<br />
gamoyenebiT SesaZlebelia sakvlevi obieqtebis Jangvis kinetikuri mrudebis ageba.<br />
sakvanZo sityvebi: mxurvalmedegoba; aluminis oqsidi; difuzuri barierebi; Jangvis kinetika;<br />
difuziis efeqturi zedapiri.<br />
UDC 669<br />
INTERPRETATION OF THE HIGH‐TEMPERATURE OXIDATION KINETICS OF Al2O3 − FORMING<br />
HEAT‐RESISTING ALLOYS<br />
O. Mikadze, I. Nakhutsrishvili, N. Maisuradze, A. Gordeziani, G. Mikadze<br />
Department of metallurgy, materials science and metal‐working, Georgian Technical University, 77, Kostava str, Tbilisi,<br />
0175, Georgia<br />
Resume: There is considered the high‐temperature oxidation kinetics of 2 3 O Al ‐ forming particularly heat‐<br />
resisting alloys, with optimal composition range. There were approved Evans kinetic equation and a new inexplicit ki‐<br />
netic equation in order to describe the growth of the protective oxide layer containing the diffusive barriers of stable<br />
phases. There were derived the calculation formulas on the base of these approved equations permitted to construct<br />
the theoretical oxidation curves of the investigated object.<br />
Key words: heat‐resistance; aluminun oxide; diffusive barriers; oxidation kinetics; effective diffusion area.<br />
32<br />
miRebulia dasabeWdad 14.02.12
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