ارزیابی خواص سایش دمابالا و دماپایین پوشش‌های TiN رسوب داده شده در دماهای مختلف

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان

چکیده

در این پژوهش پوشش نیترید تیتانیوم با استفاده از واکنش گرهای TiCl4، N2، H2 و Ar روی فولاد AISI H13 بهوسیله فرایند پوشش‌دهی رسوب شیمیایی بخار به کمک پلاسما ایجاد شد. پوشش­ ها در دماهای مختلف زیرلایه (460، 480 و 510 درجه سانتی‌گراد) ایجاد شدند. آزمون سایش از نوع ساچمه بر روی دیسک برای تعیین مکانیزم سایش در دمای بالا (400 درجه سانتی‌گراد) و دمای پایین (25 درجه سانتی‌گراد) انجام گرفت. خواص و ترکیب شیمیایی پوشش با استفاده از میکروسکوپ الکترونی روبشی، پراش اشعه­ ایکس و ریزسختی­ سنجی مورد ارزیابی قرار گرفت. نتایج آزمون سایش در دمای محیط بر حسب نرخ سایش بیان شد. آزمون سایش در دمای محیط نشان داد که پوشش TiN ایجاد شده در دمای 460 درجه سانتی‌گراد دارای کمترین میزان کاهش وزن است و این پوشش دارای بیشترین میزان سختی است. بهترین مقاومت به سایش برای پوششی با بیشترین سختی (1800 ویکرز) است. مکانیزم سایش با تغییر دمای سایش تغییر می‌کند. مشاهدات مسیر سایش نشان داد که سایش در دمای پایین به‌صورت خستگی سطحی است در حالی که سایش در دمای بالا از نوع چسبان است.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluating the Properties of High-Temperature and Low-Temperature Wear of TiN Coatings Deposited at Different Temperatures

نویسندگان [English]

  • B. Khorrami Mokhori
  • A. Shafyei
  • A. Shafyei
چکیده [English]

In this research titanium nitride (TiN) films were prepared by plasma assisted chemical vapor deposition using TiCl4, H2, N2 and Ar on the AISI H13 tool steel. Coatings were deposited during different substrate temperatures (460°C, 480 ° C  and 510 °C). Wear tests were performed in order to study the acting wear mechanisms in the high(400 °C) and low (25 °C) temperatures by ball on disc method. Coating structure and chemical composition were characterized using scanning electron microscopy, microhardness and X-ray diffraction. Wear test result was described in ambient temprature according to wear rate. It was evidenced that the TiN coating deposited at 460 °C has the least weight loss with the highest hardness value. The best wear resistance was related to the coating with the highest hardness (1800 Vickers). Wear mechanisms were observed to change by changing wear temperatures. The result of wear track indicated that low-temprature wear has surface fatigue but high-temperature wear showed adhesive mechanism.

کلیدواژه‌ها [English]

  • Chemical vapour deposition
  • titanium nitride
  • Wear test
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