نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی و علم مواد، دانشگاه صنعتی شریف، پردیس بین‌الملل، جزیره کیش، هرمزگان، ایران
2 استاد، دانشکده مهندسی و علم مواد، دانشگاه صنعتی شریف، تهران، تهران، ایران
چکیده
هدف از این پژوهش، سنتز فوم نیکل متخلخل با کاربری‌های نوین، توسط روشی اقتصادی بود. روش‌های ساخت فوم‌های فلزی، با توجه به ترکیب خواص فیزیکی و مکانیکی آن‌ها اعم از چگالی کم، نفوذپذیری بالای سیالات و هدایت حرارتی بالا، در مقایسه با فوم‌های بسپاری و سرامیکی در کاربردهای نوین، جذابیت بیشتری در میان پژوهشگران یافته است. شکل سلول‌ها، اعم از باز یا بسته بودنشان، در خواص و کاربردهای فوم‌ها بسیار مؤثر است. امروزه، پژوهش‌های گسترده‌ای درباره کاربری فوم‌های فلزی در الکترودها، مبدل‌های حرارتی، فیلترهایی مانند فوم نیکل در الکترود باتری‌ها و کاتالیزور‌ها در تولید هیدروژن به‌عنوان سوخت پاک انجام می‌شود. در این پژوهش، ابتدا، فرایند چندمرحله‌ای شیمیایی شامل چربی‌زدایی، حکاکی، حسّاس‌سازی، فعال‌سازی و اندودکاری شیمیایی (رسوب‌دهی الکترولس) نیکل روی زیرآیند (substrate) بسپار پلی‌یورتان نارسانا انجام شد. سپس لایه ضخیم‌تری از نیکل با روش الکتروشیمیایی نشانده شد و در ادامه، زیرآیند پلی‌یورتان، در کوره تیوبی با جریان گاز آرگون خالص و برنامه عملیات حرارتی کنترل‌شده، با تجزیه حرارتی زدوده شد و فوم نیکل سنتز شد. آزمون‌های شناسایی شامل پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی (SEM) و اندازه‌گیری سطح ویژه (SBET)، روی فوم نیکل سنتزشده نهایی، انجام شد. طی آزمون فشار، استحکام فشاری فوم حاصل از اندودکاری شیمیایی MPa 07/0 و با ادامه پوشش‌دهی با روش الکتروشیمیایی، استحکام فشاری به MPa 1/1 افزایش یافت و سختی HV 145 اندازه‌گیری شد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Synthesis of Porous Nickel Foam Based on Electroless Plating on Polymeric Substrate and Electrodeposition
نویسندگان [English]
- Masoomeh Zafardoagoo 1
- Sayed Khatiboleslam Sadrnezhaad 2
1 Ph. D. Student, Department of Materials Science and Engineering, International Campus, Sharif University of Technology, Kish Island, Hormozgan, Iran
2 Professor, Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Tehran, Iran
چکیده [English]
The main objective of the current study was to synthesize porous nickel foam through a cost-effective method and study its novel applications. Several characteristics such as a mix of mechanical and physical properties with low density, high fluid permeability, and thermal conductivity have made synthesis methods of metal foams attractive in specific applications for researchers compared to polymers or ceramics foams. Foams are either open or closed cells that mainly affect the material properties and end usage. Wide applications of metallic foams in electrodes, heat exchangers, and filters and nickel foams in battery electrodes and catalysts for hydrogen production as clean energy sources are increasingly investigated nowadays. In this regard, the current study aimed to investigate open cell nickel foams synthesized through multi chemical processes including degreasing, roughening, sensitization, and activation methods to nickel deposition over non-conductive polyurethane. To this end, a thicker layer was coated by hard nickel electrodeposition. Then, polyurethane substrate was removed by pyrolysis in a tube furnace with pure argon gas flow. The characteristics of the nickel coatings were studied using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), metallography, and measurement of specific surface area (BET). In the Nickel foam, the compression strength of the electroless foam was calculated as 0.07 MPa and for the electrodeposited foam, this value increased up to 1.1 MPa. In addition, its hardness was measured as 145 Vickers Hardness (HV).
کلیدواژه‌ها [English]
- Porous Nickel
- Open Cell Foam
- Electroless
- Electrodeposition
- Pyrolysis
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