نشریه علوم و مهندسی سطح

نشریه علوم و مهندسی سطح

تأثیر نیتروژن‌دهی پلاسمایی و غلظت اکسیدگرافن کاهش‌یافته بر رفتار سایشی پوشش‌های الکترولسNi-B-rGO

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشکده مهندسی مواد و متالورژی دانشگاه صنعتی امیرکبیر، تهران، ایران
2 دانشگاه صنعتی امیرکبیر
چکیده
در این مقاله، پوشش نیکل-بور- اکسید گرافن کاهش یافته (Ni-B-rGO) با غلظت‌های (0، 6، 5/20 و 40 میلی گرم) اکسید گرافن کاهش یافته (rGO) روی فولاد AISI 4140 لایه‌ نشانی شد. پس از فرایند پوشش‌دهی الکترولس، نمونه‌ها در اتمسفر حاوی %25 نیتروژن و %75 هیدروژن در مدت زمان 120 دقیقه و دمای °C 400 نیتروژن‌دهی پلاسمایی شدند و خواص ساختاری و رفتار سایشی آن بررسی شد. خواص ساختاری پوشش‌ها به کمک آزمون‌های پراش اشعه ایکس، میکروسکوپ الکترونی روبشی و آزمون سختی سنجی بررسی شد. همچنین ضریب اصطکاک و خواص سایشی نمونه‌ها به کمک آزمون پین روی دیسک مورد مطالعه قرار گرفت. نتایج نشان می‌دهد با افزایش غلظت rGO، ساختار پوشش از حالت آمورف به حالت شبه بلوری تغییر می‌کند و اضافه کردن rGO سبب افزایش مقاومت سطحی و در نتیجه افزایش سختی و بهبود مقاومت سایشی پوشش می‌گردد. اضافه کردن rGO تا غلظت mg/L 5/20 باعث بهبود مقاومت سایشی و کاهش ضریب اصطکاک شد. همچنین فرایند نیتروژن دهی پلاسمایی سبب بلوری‌شدن پوشش‌ها در اثر تشکیل فازهای Ni2B، Ni3B و h-BN شد. علاوه بر این، دو ساعت عملیات نیتروژن‌دهی پلاسمایی سختی پوشش را از 863 ویکرز به 1490 ویکرز افزایش داد. مقاومت سایشی پوشش‌ها پس از انجام نیتروژن دهی پلاسمایی افزایش یافته، به‌گونه‌ای که نرخ سایش ویژه از kg/N.m 9-10× 75/0 (نمونه‌ بدون عملیات حرارتی) به kg/N.m 9-10× 24/0 کاهش یافت.
کلیدواژه‌ها

موضوعات


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