ساخت و مشخصه یابی کامپوزیت NiO/YSZ به روش پرس سرد – تف جوشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک و انرژی، پردیس فنی و مهندسی شهید عباسپور، دانشگاه شهید بهشتی، تهران، ایران

2 گروه مواد و متالورژی، دانشکده مهندسی مکانیک و انرژی، پردیس فنی و مهندسی شهید عباسپور، دانشگاه شهید بهشتی، تهران، ایران

3 دانشگاه صنعتی امیرکبیر*مهندسی معدن و متالورژی

چکیده

در بین فرآیندهای ساخت کامپوزیت‌های زمینه سرامیکی، استفاده از روش پرس سرد-تف‌جوشی با توجه به هزینه اندک، بازده بالا و قابلیت تولید قطعات با دقت ابعادی مناسب، مورد توجه است. از نکات منفی این روش، بکارگیری حداقل دو جزء محلول پایه الکلی در فرآیند تولید می‌باشد، چراکه حذف محلول‌ها همراه با صرف انرژی و افزایش احتمال بروز ترک است. بنابراین در پژوهش حاضر تنها با استفاده از یک جزء محلول (پلی‌وینیل الکل) ، کامپوزیت سرامیک/سرامیک با روش نسبتا خشک ساخته شد. نمونه‌های کامپوزیتی YSZ- NiO با درصدهای وزنی ۲۵ ،۳۰ و ۳۵ از جزء تقویت‌کننده (ایتریا پایدار شده با زیرکونیا) در فشار 110 مگاپاسکال فشرده شده و قطعات نهایی در فرآیند تف‌جوشی در دمای 1260 درجه سانتیگراد به مدت 2 ساعت تولید گردید. در ادامه ساختار نمونه‌ها با استفاده از میکروسکوپ نوری، میکروسکوپ الکترونی روبشی و رادیوگرافی مطالعه گردیده و تحلیل بیشتر ریزساختاری با استفاده از نرم افزارهای پردازش تصویر صورت گرفته است. همچنین چگالی نمونه‌های تف‌جوشی شده با استفاده از روش ارشمیدوس محاسبه گردیده است. بررسی‌های ریزساختاری حاکی از آن است که میزان تخلخل، کیفیت سطحی و تغییر ریزساختار لایه‌ها تابع درصد وزنی تقویت کننده است. در سطح نمونه‌های خام ترک عمیق مشاهده نگردیده و در نمونه‌های تف‌جوشی شده، 30 درصد تقویت‌کننده، بهترین توزیع فاز گازی را بدون حضور ترک عمیق نشان می‌دهد. همچنین، بررسی ریزسختی قرص‌ها نشان می‌دهد که کامپوزیت با ۳۰ درصد تقویت‌کننده، بالاترین سختی را داراست. لذا به نظر می‌رسد در بین کامپوزیت‌هایی با ۲۵ تا ۳۵ درصد تقویت‌کننده، کامپوزیتی با 30 درصد تقویت‌کننده، نمونه بهینه است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Fabrication and Characterization of NiO/YSZ Composite via Cold Press-Sintering Method

نویسندگان [English]

  • Maryam Akbari 1
  • Asal Hosseini Monazzah 2
  • Nader Parvin 3
  • Khosrow Rahmani 2
1 Shahid Beheshti University, A.C., Tehran, IRAN
2 Materials and Metallurgy Group, Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran, Iran
3 Mining and Materials eng., Faculty member
چکیده [English]

Among various manufacturing processes, the use of cold press-sintering has been considered with low cost, high efficiency, and the ability to produce components with the appropriate dimensional accuracy. In this method, at least two components of the alcoholic solution used in granulation and milling steps. Removing the solutions was accompanied by energy consumption, as well as, an increment in probability of crack initiation, which may limit the widespread utilization of this method. Therefore, in the present study, the soluble component in the milling step was removed. In following just using polyvinyl alcohol as a soluble component in the granulation step, the ceramic/ ceramic composite was fabricated. Doing this, samples based on NiO and YSZ were made with different weight percentages of the reinforcement component (25, 30 and 35% wt. zirconia-stabilized yttrium), and then their microstructure, density, and hardness were investigated. Microstructural studies indicate that the amount and distribution of porosity, surface quality and depth of cracks in the samples are depended on reinforcement weight. In detailed, at the surface of raw materials, no deep crack was observed. In sintered specimens, the best distribution of the gas phase was observed in NiO- 30% wt. YSZ. In addition, the radiography results provided by the above samples indicated that deep crack in the discs is not visible. Therefore, it seems that the starch as a pore former displayed the beset role via porosity distribution and lessening crack nucleation in sample having 30% reinforcement. According to microstructural and radiography results, the maximum hardness was observed in sample having the best distribution of the gas phase in matrix.

کلیدواژه‌ها [English]

  • Ceramic matrix composite
  • Press- sintering
  • Microstructure
  • Surface quality
  • Radiography

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نشریه مهندسی مکانیک امیرکبیر
دوره 52، شماره 10
دی 1399
صفحه 2759-2778

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