اثر بار خمشی بر رسانندگی الکتریکی کامپوزیت‌های کربن-اپوکسی پرشده با نانوذرات

نوع مقاله: پژوهشی

نویسندگان

1 تهران، پژوهشکده توسعه تکنولوژی جهاد دانشگاهی صنعتی شریف، صندوق پستی 686-13445

2 تهران، دانشگاه علم و فرهنگ، دانشکده مهندسی مکانیک، صندوق پستی 68151-14619

3 تهران، دانشگاه علم و صنعت، دانشکده مهندسی مکانیک، صندوق پستی 13114-16846

4 تهران، دانشگاه تربیت مدرس، دانشکده مهندسی مکانیک، صندوق پستی 146-14115

چکیده

فرضیه: هدف از این پژوهش بررسی اثر بار خمشی بر رسانندگی الکتریکی کامپوزیت‌های کربن-اپوکسی دارای انواع نانوذرات مختلف بود. نمونه‌های توسعه‌یافته باید ضمن داشتن استحکام خمشی کافی، رسانندگی الکتریکی پیشنهادشده در استاندارد مؤسسه انرژی آمریکا را داشته باشند تا در ساخت الکترودها استفاده شوند.
روش‌ها: بدین منظور، از نانو‌ذرات دوده، نانولوله‌های کربن و گرافیت انبساط‌‌یافته همراه با الیاف کربن و رزین اپوکسی برای ساخت نمونه‌ها استفاده شد. ذرات دوده، نانولوله کربن و گرافیت انبساط‌‌یافته با مقادیر وزنی بهینه (25، 10 و %15) به کامپوزیت کربن-اپوکسی اضافه شده و آستانه رسانندگی الکتریکی نمونه‌ها مطابق روش استحکام چهارنقطه‌ای اندازه‌گیری شد. متوسط آستانه تراوایی رسانندگی الکتریکی برای کامپوزیت‌های دارای دوده، گرافیت انبساط‌‌یافته و نانولوله کربن به ترتیب 23.2، 27.3 و %24.7 به‌دست آمد. سپس، نمونه‌های مزبور زیر بار خمش قرار گرفته و به ازای 0.5، 1، 1.5، 2 و 2.5mm جابه‌جایی عرضی، مقدار رسانندگی الکتریکی حین بارگذاری و پس از باربرداری اندازه‌گیری شد.
یافته‌ها: نتایج این پژوهش نشان داد، مقدار کاهش رسانندگی الکتریکی در نمونه‌های کربن-اپوکسی دارای نانو‌لوله‌‌های کربنی ناشی از خمش کمترین مقدار و در نمونه‌های کربن-اپوکسی دارای دوده بیشترین مقدار بود. در ادامه، نمونه‌ها مطابق استاندارد خمش سه‌نقطه‌ای زیر بار خمشی قرار گرفتند و مقدار استحکام خمشی نمونه‌ها به‌دست آمد. با استفاده از تصاویر میکروسکوپ الکترونی پویشی کیفیت توزیع نانوذرات در نمونه‌ها مطالعه شد. یافته‌های این پژوهش می‌تواند در ساخت الکترودهای کامپوزیتی رسانایی استفاده شود که زیر بار خمشی (مخازن الکتروستاتیک نمک‌زدایی نفت خام) قرار می‌گیرند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Bending Load on the Electrical Conductivity of Carbon/Epoxy Composites Filled with Nanoparticles

نویسندگان [English]

  • Morteza Razavi 1
  • Mohammad Tabatabaee Ghomi 2
  • Fatollah Taheri-Behrooz 3
  • Golamhossein Liaghat4 4
1 Technology Development Institute, ACECR, P.O. Box 13445-686, Tehran, Iran
2 Department of Mechanical Engineering, University of Science and Culture, P.O. Box: 14619-68151, Tehran, Iran
3 School of Mechanical Engineering, Iran University of Science and Technology, P.O. Box 16846-13114, Tehran, Iran
4 Department of Mechanical Engineering, Tarbiat Modares University, P.O. Box 14115-146, Tehran, Iran
چکیده [English]

Hypothesis: The purpose of this study was to investigate the effect of bending load on the electrical conductivity of carbon-epoxy composites containing various nanoparticles. The developed samples, while having sufficient flexural strength, must have the electrical conductivity proposed by the U.S Energy Institute to be used in the manufacturing of electrodes.
Methods: For this purpose, carbon black nanoparticles, carbon nanotubes and expanded graphite with unidirectional carbon fabrics and epoxy resin were used to make the samples. Carbon black particles, carbon nanotube and expanded graphite with optimum weight percentages (25, 10 and 15%) were added to carbon/epoxy composite and the electrical conductivity threshold of the samples was measured according to the four-point strength method. The average electrical conductivity permeability threshold for composites containing carbon black, expanded graphite and carbon nanotubes was 23.2, 27.3 and 24.7%, respectively. The samples were then subjected to bending load and for the 0.5, 1, 1.5, 2 and 2.5 mm transverse displacement, the electrical conductivity value was measured during loading and unloading.
Findings: The results showed that the value of electrical conductivity loss in carbon/epoxy samples containing carbon nanotubes caused by bending was at lowest and in the carbon/ epoxy containing carbon black samples displayed the highest value. Then, the flexural strength of the specimens was measured using a three-point bending test method. The pattern of nanoparticle distribution in the samples was studied on images acquired by scanning electron microscope images. The result of this research could be used in manufacturing of composite electrodes which are subjected to flexural loading (electrostatic desalting crude oil tanks) in services.

کلیدواژه‌ها [English]

  • carbon black particles
  • expanded graphite particles
  • carbon nanotube particles
  • electrical conductivity threshold
  • bending load
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