METHOD FOR ESTIMATION OF THE AVERAGE
LOCAL WORKING TEMPERATURES AND THE RESIDUAL
RESOURCE OF METAL COATINGS OF GAS-TURBINE BLADES

P. G. Krukovskii and K. A. Tadlya

UDC 539. 219:620.193.2

A new method is proposed for estimation of the average 
local operating temperatures and the residual service life (resource) 
of protective MCrAlY metal coatings of gas-turbine blades after a 
certain time of operation on the basis of experimental data on the 
residual content of aluminum in the coating of a blade and/or the 
width of its first depletion zone. A physical and a mathematical model 
of the processes of oxidation and diffusion of aluminum in the coating-blade 
alloy system, accounting for the kinetics of formation of the diffusion 
zone, are presented. Results of calculation of the local working temperatures 
and the residual resource of the coating of a blade at local points 
along the outline of the blade cross section by the method proposed 
with the use of data on the width of the first depletion zone are given.

Institute of Technical Thermal Physics, National Academy 
of Sciences of Ukraine, 2a Zhelyabov Str., Kiev, 03057, Ukraine; email: 
kruk@i.kiev.ua. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 
80, No. 3, pp. 16-23, May-June, 2007. Original article submitted 
November 1, 2005.