بررسی اثر دما بر ریزساختار و خواص مکانیکی کامپوزیت سرامیکی فوق دما بالا ZrB2-SiC-TiC به روش تف‌جوشی پلاسمای جرقه‌ای چندمرحله‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان، اصفهان 84156-83111، ایران

چکیده

تف‌جوشی  ZrB2 به دلیل ماهیت کووالانسی و دمای تف‌جوشی بالا با چالش مواجه است. بررسی تحقیقات قبلی نشان داد، حضور حداکثر 20 درصد حجمی SiC در میان افزودنی‌های پیشنهادشده، موجب بهبود فرایند تف‌جوشی و خواص مکانیکی کامپوزیت پایه ZrB2 شده است. هدف پژوهش، ساخت و مشخصه‌یابی کامپوزیت سرامیکی فوق دما بالا پایه ZrB2-20 vol% SiC به روش تف‌جوشی پلاسمای جرقه‌ای با روش چندمرحله‌ای در دماهای مختلف و بررسی اثر آن بر رفتار افزودنی‌ TiC و خواص مکانیکی کامپوزیت است. لذا اثر دما بر روی ریزساختار و خواص مکانیکی از دمای 1600 تا 1900 درجه سانتی‌گراد و فشار 30 مگاپاسکال و افزودنی 10 درصد حجمی TiC بررسی شد. افزودن TiC تا 10 درصد حجمی به کامپوزیتZrB2-20 vol% SiC  و تف‌جوشی آن تحت دمای 1800 درجه سانتی‌گراد و زمان ماند پنج دقیقه، به دلیل تشکیل محلول جامد (Zr,Ti)B2 و (Ti,Zr)C در زمینه و واکنش با اکسیدهای سطحی پودر ZrB2 نظیر ZrO2 و B2O3 منجر به افزایش 15 درصدی چگالی نسبی و بهبود خواص مکانیکی شامل سختی (14 درصد)، مدول الاستیک (12 درصد)، استحکام شکست (20 درصد) و چقرمگی شکست (8 درصد) شد؛ مقایسه نتایج این پژوهش نسبت به تحقیقات قبل نشان داد استفاده از تف‌جوشی پلاسمای جرقه‌ای با روش چندمرحله‌ای به جای تف‌جوشی پلاسمای جرقه‌ای تک‌‌مرحله‌ای موجب کاهش دما و زمان ماند جهت رسیدن به تراکم بالای 99 درصد شد. همچنین نتایج نشان داد افزایش بیشینه دمای تف‌جوشی به 1900 درجه سانتی‌گراد در کامپوزیت ZrB2- 20 vol% SiC – 10 vol% TiC موجب رشد افراطی دانه و کاهش جزئی چگالی نسبی به مقدار یک درصد می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the Effect of Temperature on the Microstructural and Mechanical Properties of the Ultra-High Temperature Ceramic Composite ZrB2-SiC-TiC Using the Multi-Step Spark Plasma Sintering Method

نویسندگان [English]

  • S. Pourbahraini
  • M. Ahmadian
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
چکیده [English]

The sintering of ZrB2 presents significant challenges due to its covalent bonding and the high temperatures required for the process. Prior research has demonstrated that incorporating up to 20% by volume of SiC as an additive can enhance both the sintering process and the mechanical properties of ZrB2-based composites. The objective of this study was to fabricate and characterize an ultra-high temperature ceramic composite composed of ZrB2 containing 20 vol. % SiC, utilizing the Spark Plasma Sintering (SPS) method with a multi-step approach at various temperatures. Additionally, the study sought to investigate the influence of a TiC additive on the microstructural evolution and mechanical properties of the composite. The research focused on assessing the impact of sintering temperature, ranging from 1600°C to 1900°C under a pressure of 30 MPa, in the presence of a 10 vol. % TiC additive. The introduction of up to 10% by volume of TiC into the ZrB2-20 vol. % SiC composite, followed by sintering at 1800°C for 5 minutes, resulted in the formation of (Zr,Ti)B2 and (Ti,Zr)C solid solutions within the matrix. These solid solutions, along with reactions involving surface oxides such as ZrO2 and B2O3, contributed to a 15% increase in relative density. Furthermore, notable enhancement was observed in the mechanical properties, including a 14% increase in hardness, a 12% increase in elastic modulus, a 20% increase in fracture strength, and an 8% increase in fracture toughness. A comparative analysis with previous studies revealed that employing a multi-step SPS technique, as opposed to a single-step process, significantly reduced the temperature and time of the process to achieve a relative density exceeding 99%. However, it was also observed that increasing the maximum sintering temperature to 1900°C in the ZrB2-20 vol. % SiC-10 vol. % TiC composite resulted in excessive grain growth and a slight decrease in relative density by approximately 1%.

کلیدواژه‌ها [English]

  • Ultra-high temperature ceramics
  • Ceramic matrix composite
  • Zirconium diboride
  • Silicon carbide
  • Titanium carbide
  • Multi-step spark plasma sintering
  • Solid solution

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مواد پیشرفته در مهندسی
دوره 43، شماره 4
آذر 1403
صفحه 1-21

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