بررسی مقاومت به اکسیداسیون کامپوزیت چهارجزئی HfB2-HfC-TiC-B4C

نوع مقاله : علمی و پژوهشی

نویسندگان

1 گروه مهندسی مواد، واحد اهواز، دانشگاه آزاد اسلامی، اهواز.ایران.

2 گروه مهندسی مواد، واحد اهواز، دانشگاه آزاد اسلامی، اهواز. ایران.

3 گروه مهندسی و علم مواد، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه.

چکیده

در این پژوهش به بررسی مقاومت به اکسایش کامپوزیت های چهار جزیی HfB2-HfC-TiC-B4C با نسبت های مولی برابر و 7:1:1:1 با و بدون نایوبیوم پرداخته شده است. برای این منظور چهار کامپوزیت 70HfB2-HfC-TiC-B4C، 70HfB2-HfC-TiC-B4C/Nb، HfB2-HfC-TiC-B4C و HfB2-HfC-TiC-B4C/Nb به روش پلاسمای جرقه ای در دمای 2000 درجه سانتیگراد، زمان نگه داری 25 دققیقه و فشار 35 مگاپاسکال تفجوشی شدند. بررسی مقاومت به اکسایش نمونه ها در دمای 1200 درجه سانتیگراد و زمان ماندگاری 20 دقیقه، به روش TG و DTA همزمان انجام شد. شناسایی فاز و بررسی های ریزساختاری به ترتیب با روش های تفرق اشعه X ( XRD ) و میکروسکوپ الکترونی روبشی ( SEM ) انجام شد. نتایج نشان داد که پوسته اکسیدی تشکیل شده در تمامی نمونه ها HfO2 می باشد. مشخص شد که نمونه های با نسبت مولی برابر دارای مقاومت به اکسایش بالاتری نسبت به نمونه های با نسبت 7:1:1:1 می باشند. حضور نایوبیوم نیز سبب تشکیل پوسته اکسیدی چگال تر شده و از این رو مقاومت به اکسایش را بهبود می بخشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the oxidation resistance of the HfB2-HfC-TiC-B4C quaternary composite

نویسندگان [English]

  • parisa chenari 1
  • zohre balak 2
  • vahide shahedifar 3
1 Department of Materials Science and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
2 Department of Materials Science and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
3 Department of Materials Science and Engineering, Faculty of Engineering, Urmia University, Urmia, Iran.
چکیده [English]

In this research,the oxidation resistance of HfB2-HfC-TiC-B4C four-component composites with equal molar ratios of 7:1:1:1 with and without niobium has been investigated. For this purpose, four composites 70HfB2-HfC-TiC-B4C, 70HfB2-HfC-TiC-B4C/Nb, HfB2-HfC-TiC-B4C and HfB2-HfC-TiC-B4C/Nb were sintered by spark plasma (SPS) method at the temperature of 2000 C, holding time of 25 min, under the pressure of 35 MPa. The oxidation resistance of the samples was investigated at 1200 degrees Celsius and 20 minutes holding time by Thermogravimetric analysis (TG) and DTA methods simultaneously. Phase identification and microstructural investigations were done by X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods, respectively. The results showed that the oxide scale formed in all samples is HfO2 phase. It was found that samples with equal molar ratio (1:1:1:1) have higher oxidation resistance than samples with 7:1:1:1 ratio. The presence of niobium also causes the formation of a denser oxide shell and thus improves oxidation resistance.

کلیدواژه‌ها [English]

  • Oxidation resistance
  • Thermal analysis
  • Ultra high temperature ceramic
  • spark plasma sintering

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