tailieunhanh - Gas Turbines Part 15

Tham khảo tài liệu 'gas turbines part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Life Time Analysis of MCrAlY Coatings for Industrial Gas Turbine Blades calculational and experimental approach 339 derived with regard to the stoichiometric relationship between Al and oxygen masses consumed to form an aluminium oxide. The relationship is used in the model of parabolic law of oxide film thickness growth . According to the accepted model prototype 6 the following concentration values are set on movable borders x2 and x3 c x2- T c x3 T cr c x2 T c x3-T cr p . 8 Then by analogy with the boundary condition 5 for a movable border X4 we can write the aluminium diffusion flow from a coating to the right to form the interdiffusion zone Ay x5 -x4 and aluminium diffusion to a basic metal as d c x4_ T Jb x4_ T -Def-d -2 9 In compliance with the physical model the aluminium flow 9 arrived from the coating takes part in the formation of new phases in the interdiffusion zone Ay x5 - x4 thick and uniformly segregates in this zone that is Jb x4- T W x T Ay T 10 where the interdiffusion zone width Ay x5 - x4 increase with time due to the border x5 movement to the right and the parabolic law of its growth as for the oxide film is taken in the form of Ay T x5 T -x4 kiz yR- z 11 kiz factors and T value in 11 are determined from the experimental data on the interdiffusion zone growth with time. The expression for Al W mass arrived from the coating and uniformly segregated in the interdiffusion zone x4 x x5 is taken as dependent on cr p - c. . in power m and has the form W W x T K cy p - cY m x4 x x5 12 10 x1 x x4 x x5 where kw -intensity factor of aluminium segregation in the interdiffusion zone. Since the balance of masses must be met in the coating-oxide film-basic alloy system the expression for the total aluminium flow departed from the coating two-phase zone in accord with 5 and 9 will take the form h t Jox x1 T Jb x4- T 13 In accord with the accepted physical model all aluminium flowing from the coating departs the coating y P two-phase zone at the .

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