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[ Last edited by wuheng on 2008-6-13 at 20:40 ]

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transition layer
The primary purpose of transition layer is to reduce the dismatch of coefficient of heat expansion betwen coating and substrate or different compositions of substrate.To prevent the chemical reaction betwen sealing coating and substrate at the same time,thus to improve the physical chemistry compatibility.
Another key factor which influence the coating oxidation resistance is the crackle due to mismatch of linear expansibility £¬washed by high airspeed£¬those crackle not only provide the fast track for oxygen infiltrate£¬but also be the source to form the coating.Therefor we must form transition layer by the material with its linear expansibility as close as possible first£¬usually prepare Si3N4 and SiC layer by means of CVD at substrate surface.
2Â¥2008-06-12 21:39:37
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