ارزیابی میکروساختاری پوشش‌های YSZپاشش پلاسمایی

محورهای موضوعی : عملیات حرارتی

سید علی صادقی فدکی ¹ , ضیاء والفی ² , کریم زنگنه مدار ³

1 - کارشناس ارشد، دانشگاه صنعتی مالک اشتر، تهران
2 - استادیار، دانشگاه صنعتی مالک اشتر، مجتمع مواد فلزی، تهران
3 - دانشیار، دانشگاه صنعتی مالک اشتر، مجتمع مواد فلزی، تهران

تاریخ دریافت : 1392/02/23 تاریخ پذیرش : 1392/06/10 تاریخ انتشار : 1394/03/01

کلید واژه: میکروساختار, تخلخل, ذرات پودری ذوب نشده, پاشش پلاسمایی, پوشش زیرکونیا,

چکیده مقاله :

در این تحقیق، پوشش‌های زیرکونیای پایدار شده با ایتریا توسط روش پاشش پلاسمای اتمسفری بر روی زیرلایه‌ای از جنس فولاد کربنی اعمال گردید. مشخصه‌های میکروساختاری پوشش با استفاده از میکروسکوپ الکترونی روبشی و نیز پردازش تصویر به کمک میکروسکوپ نوری تعیین گردید. همچنبن ارتباط میان مشخصه‌های کمی میکروساختار پوشش YSZ با پارامترهای پاشش پلاسمایی (فاصله پاشش و نرخ تزریق پودر) مشخص گردید. نتایج حاکی از این است که با تغییر فاصله پاشش و نرخ تزریق پودر، میزان تخلخل، مورفولوژی تخلخل و درصد ذرات پودری ذوب نشده در میکروساختار تغییر می‌یابد. بعلاوه، نتایج نشان داد تاثیر نرخ تزریق پودر بر مشخصه‌های میکروساختاری نسبت به فاصله پاشش بیشتر می‌باشد.

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