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Register a new userDistribution of Nitrogen Diffusion Study Through Layer Surface of α – Iron
دراسة توزع انتشار النتروجين في الطبقة السطحية لعينة من α – Iron
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قمنا في هذا البحث بدراسة تحليلية لتوزع ذرات النتروجين في الطبقة السطحية لعينة من دراسة توزع انتشار النتروجين في الطبقة السطحية لعينة من α – Iron باستخدام الحل العددي لمعادلة الانتشار التفاضلية الخطية بطريقة Crank – Nicolson في المجال الحراري ، و المدى الزمني ، حيث وجدنا أن ثابت انتشار النتروجين في الطبقة السطحية لهذه العينة عند درجة الحرارة ، و زمن المعالجة. كما لاحظنا ضمن الشروط المقترحة إن عمق انتشار ذرات النتروجين من سطح العينة باتجاه الداخل يصل ، و بالتالي يمكننا تحديد سماكة طبقة المركبات النتريدية المتشكّلة التي تكسب الطبقة السطحية لعينة مقاومة عالية لعمليات التآكل الناتجة عن مختلف العوامل الخارجية .
This paper aims to study the distribution of free nitrogen atoms through surface of α – Fe sample using the numerical solution for linear differential equation by means of Crank – Nicolson method at a temperature range ( 550 to 950 0C) and time interval (0 – 8)h where the nitrogen diffusion constant is at 850 0C and 8h. Under the supposed condition this study has illustrated that the diffusion depth of nitrogen atoms from surface towards inners reaches to ̴ 1.2mm, i.e., determining the layer thickness of the formed nitride compounds which gives the surface layer of α – Fe high resistance against corrosion processes resulting from surrounded environment.
References used
Goune M. and Belmonte T. Modeling of diffusion precipitation in nitride alloyed iron. Thin solid films,2000,543 – 549
Walkowicz J. On the mechanisms of diode plasma nitriding in N2 – H2 mixture under DC – pulsed substrate biasing .surface and coating technology,2003,1211 – 1219
Ruset C and Mayak B.the influence of the sputtering process on the constitution of the compound layers obtained by plasma intruding. surface and coating technology,2003,1201 – 1205
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