تف‌جوشی پلاسمای جرقه‌ای سرامیک ZrB2 تقویت‌شده با SiC ذره‌ای و ویسکر

نوع مقاله : علمی و پژوهشی

نویسندگان

• مهدی شاهدی اصل ¹
• زهره احمدی ²

¹ گروه مهندسی مکانیک، دانشگاه محقق اردبیلی، اردبیل.

² عضو بنیاد پژوهشگران دانشگاه محقق اردبیلی، اردبیل.

10.22067/ma.v31i1.74355

چکیده

تأثیر مورفولوژی‌ فاز ثانویه کاربید سیلیسیم بر چگالش و خواص مکانیکی کامپوزیت‌های فوق دمابالای دی‌بورید زیرکونیم بررسی شد. سرامیک دی‌بورید زیرکونیم خالص (به‌عنوان نمونه شاهد) و کامپوزیت‌های دی‌بورید زیرکونیم تقویت‌شده با 25 درصد حجمی کاربید سیلیسیم در مورفولوژی‌های متفاوت (ذره‌ای، ویسکر و مخلوط) به‌روش تف‌جوشی پلاسمای جرقه‌ای تولید شد. فرایند تف‌جوشی در دمای 1900 درجه سانتی‌‌گراد به‌مدت 7 دقیقه با فشار 40 مگاپاسکال انجام شد. چگالی نسبی نمونه شاهد حدود 96 درصد به‌دست آمد، ولی نمونه‌های کامپوزیتی به چگالی نظری رسیدند. سختی و چقرمگی شکست نمونه‌های تقویت‌شده با کاربید سیلیسیم بیشتر از نمونۀ شاهد سرامیکی حاصل شد. افزودن توأمان ذرات و ویسکرهای کاربید سیلیسیم، اثرگذاری بهتری در ارتقای خواص مکانیکی کامپوزیت داشت.

کلیدواژه‌ها

• دی‌بورید زیرکونیم
• کاربید سیلیسیم
• مورفولوژی
• چگالش
• خواص مکانیکی

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عنوان مقاله [English]

Spark Plasma Sintering of ZrB2-Based Ceramic Reinforced with SiC Particles and Whiskers

نویسندگان [English]

• Mehdi Shahedi Asl ¹
• Zohre Ahmadi ²

¹ Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.

² Member of Researchers Foundation of University of Mohaghegh Ardabili, Ardabil, Iran.

چکیده [English]

Effects of silicon carbide as the reinforcement on densification and mechanical properties of zirconium diboride-based ultra-high temperature composites were studied. A monolithic ZrB₂ ceramic (as the baseline) and three ZrB₂-based composites reinforced with 25 vol% SiC in different morphologies (particulate, whisker and particulate/whisker mixture) were fabricated by spark plasma sintering route. The sintering process was conducted at 1900 °C for 7 min under 40 MPa. A relative density of ~96% was obtained for the ZrB₂ ceramic but the other composites approached their theoretical densities. The hardness and fracture toughness values of SiC reinforced samples were higher than those for the monolithic one. The simultaneous addition of SiC particulates/whiskers showed a synergistic effect on the enhancement of mechanical performance of composite.

کلیدواژه‌ها [English]

• Zirconium diboride
• Silicon carbide
• Morphology
• Densification
• Mechanical properties

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