NASA Technical Reports Server (NTRS) 20020023939: COSIM: A Finite-Difference Computer Model to Predict Ternary Concentration Profiles Associated With Oxidation and Interdiffusion of Overlay-Coated SubstratesReportar como inadecuado




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A finite-difference computer program (COSIM) has been written which models the one-dimensional, diffusional transport associated with high-temperature oxidation and interdiffusion of overlay-coated substrates. The program predicts concentration profiles for up to three elements in the coating and substrate after various oxidation exposures. Surface

Autor: NASA Technical Reports Server (NTRS)

Fuente: https://archive.org/


Introducción



COSIM - A Finite-DifferenceComputerModel to PredictTernary Associated With Oxidation and Interdiffusion James NASA Concentration of Overlay-Coated Profiles Substrates A.
Nesbitt Glenn Research Cleveland, OH Center 44135 Abstract A finite-difference dimensional, diffusional of overlay-coated elements solute computer transport substrates. in the coating growth are taken and substrate model to predicting solute subroutines oxidation problems. to simulate coating content numerous cross terms drops either profiles life based profiles exposures. also incorporates isothermal and interdiffusion for up to three Surface to 2%).
The computer dependent and easily due to In the program failure criterion in FORTRAN modifiable oxide exposures. exposures, code is written flexible recession diffusion oxidation oxidation on a concentration the one- a previously-developed or cyclic after various to make the program models oxidation concentration oxidation which and concentration-dependent The program concentration also be used to predict surface Ternary has been written with high-temperature predicts after various into account. and spalling addition (COSIM) associated The program loss is also predicted. coefficients program can (e.g., and employs to other coating Introduction Many blades coating to impart provide protection Under and vanes additional by the selective isothermal conditions, proportional to the square the growing oxide is continually typically periods, primarily the oxide reaches Whenever the oxide February surfaces but more A1 to easily land-based temperatures but is higher commonly occurs is not catastrophic high temperatures scale scale spallation since of the scale. occurs protection operate in a nearly is shut down, generally and corners. only in the outer selective oxidation due to thermal will, on average, isothermal can cause occu...






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