نوع مقاله: مقاله پژوهشی

نویسندگان

1 دکتری تخصصی، مهندسی مواد و متالورژی، دانشکده فنی و مهندسی گلپایگان، اصفهان، ایران

2 کارشناسی ارشد، مهندسی مواد، دانشگاه صنعتی مالک اشتر، شاهین شهر، اصفهان

3 استادیار، مهندسی مواد، دانشگاه صنعتی همدان، همدان، ایران

4 استادیار، مهندسی مواد، مرکز تحقیقات مواد پیشرفته، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

10.22068/jstc.2018.89074.1455

چکیده

در این تحقیق از پودر آلومیناید آهن سنتز شده به روش آلیاژسازی مکانیکی و عملیات آنیل برای تولید کامپوزیت کاربید تنگستن- آلومیناید آهن استفاده شد. مخلوط پودرهای کاربید تنگستن و آلومیناید آهن با ترکیب WC-25vol% FeAl به روش سینترینگ پلاسمای جرقه‌ای در دمای ℃ 1150 سنتز شد. سختی، تافنس شکست و رفتار سایشی نمونه تولیدی مورد ارزیابی قرار گرفت و نتایج آن با نمونه کاربید تنگستن- کبالت تجاری مقایسه شد. بررسی ساختاری از مخلوط پودری نشان داد که ذرات آلومیناید آهن و ذرات کاربید تنگستن به صورت کاملاً همگن در همدیگر پخش شده‌اند که دلیل آن وجود ذرات آلومیناید آهن با اندازه ذره در محدوده 50 تا 800 نانومتر بوده است. در شرایط سینترینگ، وجود ذرات فاز زمینه آلومیناید آهن با اندازه نانو توانایی نفوذ سریع بین ذرات کاربیدی و همچنین پر کردن فضاهای خالی بین ذرات بزرگتر را داشته و منجر به تشکیل ساختار کاملاً همگن با چگالی تقریباً برابر با چگالی تئوری شده است. سختی و تافنس شکست نمونه کاربید تنگستن- آلومیناید آهن تولیدی به‌ترتیب برابر با GPa 17.90 و MPa√m 9.1 به‌دست آمده است که نسبت به نمونه کاربید تنگستن- کبالت دارای سختی بالاتر (GPa 15.70) و تافنس شکست به‌میزان جزئی پایین‌تر است. نتایج آزمون سایش نشان داد که با افزایش دمای آزمون از دمای اتاق به ℃500، نرخ سایش ویژه برای هر دو نمونه افزایش یافته است. همچنین نمونه کاربید تنگستن- آلومیناید آهن نسبت به نمونه کاربید تنگستن- کبالت در دو شرایط دمای اتاق و دمای ℃ 500 مقاومت به سایش بالاتری از خود نشان داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Influence of nanostructured FeAl powder addition on mechanical properties of WC composites produced by Spark plasma sintering technique

نویسندگان [English]

  • morteza hadi 1
  • hadi karimi 2
  • omid bayat 3
  • iman ebrahimzadeh 4

1 Department of Material Engineering, Golpayegan University, Isfahan,Iran

2 Department of Material Engineering, Malek ashtar university of technology, Shahinshahr, Iran.

3 Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran

4 Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

چکیده [English]

In this study, a FeAl powder synthesized by mechanical alloying and annealing process was used as a binder to produce WC-FeAl composite. The powders of WC and FeAl were blended with composition of WC-25 vol% FeAl and sintered by spark plasma sintering at 1150℃. The hardness, fracture toughness and wear behavior of sintered WC-FeAl sample was investigated and compared with a commercial WC-Co. Structural evaluation of mixed powder was showed a homogeneous distribution of WC and FeAl which related to particle size of FeAl to be in the range of 50-800 nm. FeAl nanoparticles were able to diffuse faster between WC particles and occupy interparticle spaces among larger particles in the sintering condition; thus resulted to formation of an almost homogeneous structure with densification to near theoretical density. The hardness and fracture toughness of WC-FeAl was 17.90 GPa and 9.1 MPa√m, respectively that this hardness was higher than that of WC-Co (15.7 GPa) and fracture toughness was lower slightly. The results for wear test showed that the specific wear rate of both samples was enhanced with increasing the test temperature from room temperature to 500℃. Furthermore, WC-FeAl showed higher wear resistance than WC-Co at both room and 500℃ temperatures.

کلیدواژه‌ها [English]

  • Tungsten carbide
  • Sintering
  • Mechanical properties
  • Wear

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