مهندسی متالورژی

مهندسی متالورژی

مقایسه خواص الکتریکی سرامیک‌های وریستور ZnO-Bi2O3-Sb2O3 تهیه شده به روش های زینتر سنتی و فلش

نوع مقاله : مقاله پژوهشی

نویسندگان
اکبر امینی 1
مرجان رجبی 2
سید محمد زهرایی 3
1 ، پژوهشکده مواد پیشرفته و انرژی‌های نو، سازمان پژوهش‌های علمی و صنعتی ایران
2 گروه مواد در انرژی- پژوهشکده مواد پیشرفته و انرژی های نو- سازمان پژوهش های علمی و صنعتی ایران- تهران
3 پژوهشکده مواد پیشرفته و انرژی های نو، سازمان پژوهش‌های علمی و صنعتی ایران
10.22076/me.2024.2005656.1380
چکیده
در این مقاله سرامیک وریستور پایه ZnO-Bi2O3-Sb2O3 به روش فلش زینتر تحت میدان الکتریکی V/cm300 و چگالی جریان mA/mm2 100 ساخته و خواص ساختاری و الکتریکی آن با نمونه‌ی زینتر شده به روش مرسوم مقایسه شده است. چگالی نمونه فلش زینتر به مقدار 6/95% چگالی تئوری رسیده و ریزساختار و فازهای موجود در آن مشابه نمونه زینتر سنتی است. رسم منحنی E-J رفتار غیرخطی و خواص وریستوری نمونه‌ی فلش زینتر شده را نشان می‌دهد. مقادیر ضریب غیرخطی نمونه‌هایی زینتر شده یه روش‌های فلش و مرسوم به ترتیب 4/34 و 5/41 بدست آمد. ارتفاع سد پتانسیل، عرض لایه تهی، چگالی دهنده‌ها و حالات سطحی در فصل مشترک دانه و مرزدانه تحت میدان الکتریکیDC با استفاده از مدل گسیل گرمایونی محاسبه شده است. مقدار مقاومت الکتریکی مرزدانه که به روش امپدانس الکتروشیمیایی اندازه‌گیری شده است در نمونه فلش زینتر کمتر از نمونه زینتر شده مرسوم می‌باشد که دلیل آن عدم زمان کافی برای نفوذ کامل یون‌ها از حجم فاز عایق به مرز دانه است. پایداری نمونه‌ها با استفاده از روش خزش جریان در اثر اعمال دما و میدان الکتریکی بررسی شد. نتایج نشان داد نشت جریان در نمونه‌ی فلش زینتر شده بیشتر از نمونه‌ی زینتر شده معمولی است.
کلیدواژه‌ها
وریستور
اکسید روی
فلش زینتر
خواص الکتریکی

عنوان مقاله English

Comparison of electrical properties of ZnO-Bi2O3-Sb2O3 varistor ceramics prepared by conventional and flash sintering methods

نویسندگان English

Akbar Amini 1
Marjan Rajabi 2
Seyed Mohammad Zahraei 3
1 Department of Advanced Materials and Renewable Energy, Iranian Research Organization for Science and Technology (IROST)
2 Department of Advanced Materials and Renewable energy- Iranian Research Organization for Science and Technology (IROST)- Tehran- Iran
3 Department of Advanced Materials and Renewable Energy, Iranian Research Organization for Science and Technology (IROST)
چکیده English

In this research, the ZnO-Bi2O3-Sb2O3- based varistor ceramic was made under an electric field of 300V/cm and a current density of 100 mA/mm2 by flash sintering method, and its properties were compared with the conventionally sintered sample. The density of the flash sinter sample reached 95.6% of the theoretical density and the microstructure and phases in it were similar to the conventional sinter sample. E-J curve showed that the sintered flash sample also has nonlinear behavior and varistor properties. The value of nonlinear coefficient was obtained for flash and conventionally sintered samples, 34.4 and 41.5, respectively. Using the thermionic emission model, the potential barrier height, the width of the depletion layer, the density of donors and the surface states at the interface of grain and grain boundary were measured under DC electric field. The electrical resistance value of the grain boundary, which was measured by the electrochemical impedance method, was lower in the flash sintered sample than in the conventional sintered sample, which is due to the lack of sufficient time for ions to diffuse completely from the volume of the insulating phase to the grain boundary. The stability of the samples was investigated by measuring the current creep by applying temperature and electric field. The results showed that the current leakage in the flash sintered sample is more than the conventional sintered sample.

کلیدواژه‌ها English

varistor
zinc oxide
flash sinter
electrical properties
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  • تاریخ دریافت 06 تیر 1402
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  • تاریخ پذیرش 14 اسفند 1402