رفتار میکروتریبولوژی پوشش‌های الکتروفورتیک نانوکامپوزیتی HA-TiO2

نوع مقاله : علمی و پژوهشی

نویسنده

• حمیدرضا فرنوش

دانشگاه کاشان

10.22067/ma.v0i29.43430

چکیده

در این پژوهش، از لایه‌نشانی الکتروفورتیک برای ایجاد پوشش‌های نانوکامپوزیتی HA-TiO2 با ترکیب 0، 10 و 20 درصد وزنی تیتانیا بر روی زیرلایه Ti-6Al-4V استفاده شد. آزمون ریزخراش در حالت نیروی پیشرونده برای بررسی چسبندگی، تریبولوژی و اندازه‌گیری چقرمگی شکست پوشش‌ها انجام شد. مقادیر فشار تماسی بحرانی در آزمون ریزخراش برای آغاز ایجاد ترک و جدا شدن لایه رسوبی از سطح با افزودن تیتانیا در ساختار پوشش افزایش یافت. بر اساس تئوری مکانیک شکست الاستیک خطی بیشترین مقدار چقرمگی شکست در نمونه کامپوزیتی با 20 درصد وزنی تیتانیا حاصل شد. شیارهای حاصل از آزمون ریزخراش، توسط میکروسکوپ الکترونی روبشی مطالعه شدند.

کلیدواژه‌ها

• ریزخراش
• لایه‌نشانی الکتروفورتیک
• هیدروکسی آپاتیت
• تیتانیا

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عنوان مقاله [English]

Micro-tribological Behavior of Electrophoretically Deposited HA-TiO2 Nanocomposite Coatings

نویسنده [English]

• Hamidreza Farnoush

University of Kashan

چکیده [English]

In the present study, the HA-TiO2 nanostructured composite coatings with 0, 10 and 20 wt.% TiO2 were fabricated by electrophoretic deposition on Ti-6Al-4V substrate. Micro-scratch tests in progressive load mode, were examined for evaluation of adhesion strength, tribology and fracture toughness of coatings. The critical contact pressures in micro-scratch test for crack initiation and delamination were increased by the addition of TiO2 content in the coating. Moreover, according to the linear elastic fracture mechanics, the maximum fracture toughness of coatings was obtained for HA-20 wt.% TiO2 sample. The scratch grooves were studied by scanning electron microscope.

کلیدواژه‌ها [English]

• Micro-scratch
• Electrophoretic Deposition
• Hydroxyapatite
• Titania

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