پایان نامه ایجاد پوشش‌ های نانو ساختار برای کار در شرایط دمای بالا

فهرست:

1. فصل اول: مقدمه 1

1-1- مقدمه.. 2

2. فصل دوم: مروری بر تحقیقات انجام شده 4

2-1- ترکیب سوپرآلیاژها 5

2-2 پوشش‌های مورد استفاده در سوپرآلیاژها 6

2-3- فرآیند‌های رسوب‌دهی.... 7

2-3-1- رسوب‌دهی الکتریکی.... 7

2-4- نکات مهم در طراحی نانو کامپوزیت‌ها 12

2-4-1- پراکندگی.... 12

2-4-2- آرایش..... 12

2-4-3- ارزش اقتصادی.... 13

2-4-4- رسوب الکتریکی.... 13

2-5- فرآیند سمنتاسیون پودری برای تولید پوشش‌های آلومیناید... 13

2-5-1- مزایای فرآیند سمنتاسیون پودری.... 15

2-5-2- محدودیت‌های فرآیند سمنتاسیون پودری.... 15

2-6- پوشش‌های آلومیناید بر روی نیکل و سوپر آلیاژهای پایه نیکل... 16

2-6-1- پوشش‌های بدست آمده از فرآیند با اکتیویته بالای آلومینیوم   17

2-6-2- پوشش‌های تولید شده توسط فرآیندهای اکتیویته پایین آلومینیوم   22

2-6-2-2- سوپر آلیاژهای پایه نیکل... 23

2-7- پیش عملیات قبل از آلومینایزینگ...... 24

2-8- مورفولوژی سطح پوشش‌های آلومیناید... 25

2-9- سیستم‌های آلومیناساز. 27

2-10- مکانیزم‌های اثر عناصر واکنشگر  در آلیاژهای آلومینا ساز. 28

2-11- تاثیر عناصر واکنشگر بر پوسته آلومینا 29

2-11-1- تاثیر عناصر واکنشگر بر رشد و چسبندگی پوسته آلومینا 30

2-11-2- تقویت پیوند آلیاژ/پوسته و پدیده جدایش..... 30

3. فصل سوم: روش تحقیق  32

3-2- مواد اولیه و تجهیزات مورد نظر برای اعمال پوشش..... 34

3-2-1- آلیاژ زیر لایه.. 34

3-2-2- فرآیند آبکاری الکتریکی.... 34

3-2-2-1- مواد مورد استفاده در فرآیند آبکاری الکتریکی.... 34

3-2-2-2- تجهیزات مورد استفاده در فرآیند آبکاری الکتریکی.... 36

3-2-2-3- اعمال پوشش آبکاری الکتریکی.... 37

3-2-3- فرآیند پوشش‌دهی نفوذی.... 40

3-2-3-1- پودرهای مورد استفاده در فرآیند پوشش‌دهی نفوذی.... 40

3-2-3-2- تجهیزات مورد استفاده در فرآیند پوشش‌دهی نفوذی.... 40

3-2-3-3- اعمال پوشش نفوذی.... 41

3-3- مشخصه‌یابی نمونه‌ها 42

3-3-1- متالوگرافی.... 42

3-3-2- مشاهده ریزساختار. 42

4. فصل چهارم: یافته‌های آزمایشگاهی  44

4-1- آبکاری الکتریکی نیکل... 45

4-2- آبکاری نیکل نانوکامپوزیتی.... 45

4-3- آلومینیوم‌دهی نفوذی.... 48

4-4- پوشش‌های نهایی.... 52

5. فصل پنجم: تحلیل یافته‌ها 57

6. فصل ششم: نتیجه‌گیری و پیشنهادات   60

6-1- نتیجه‌گیری.... 61

6-2- پیشنهادات.... 62

مراجع   63

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