نویسندگان
1 پژوهشکده سرامیک، پژوهشگاه مواد و انرژی کارشناس ارشد
2 استاد، پژوهشکده سرامیک، پژوهشگاه مواد و انرژی
3 استادیار، پژوهشکده فناوری نانو و مواد پیشرفته، پژوهشگاه مواد و انرژی
4 دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان
چکیده
در این پژوهش پوشش ضخیم تیتانات باریم بوسیله روش پاشش حرارتی بر روی فولاد زنگ نزن ایجاد شد. مورفولوژی و ساختار این پوشش که بوسیله روش پاشش پلاسمایی اتمسفری تشکیل شده است، با استفاده از میکروسکوپ الکترونی روبشی (SEM) و پراش پرتو ایکس (XRD) بررسی شدند. نتایج نشان داد بهینه سازی پارامترهای دستگاه پاشش پلاسمایی روی خواص نهایی و یکنواختی پوشش اثر گذار است. با توجه به نتایج تست XRDپوشش نهایی دارای ساختار پلیکریستال با مقدار بسیار جزئی فاز آمورف است. نسبت فاز کریستالی به فاز آمورف بر خواص دی الکتریک پوشش بسیار اثر گذار بوده، بطوریکه با افزایش فاز کریستالی میزان ضریب دی الکتریک پوشش افزایش یافت. ترک های ریز و مرز بین اسپلت ها نیز از عوامل مهم و اثر گذار بر خواص نهایی پوشش هستند. بیشترین میزان ضریب دی الکتریک برای پوشش تیتانات باریم در محدوده بین 85 تا 120 قرار داشت. این محدوده بعد از عملیات حرارتی به 160 تا 180 تغییر پیدا نمود.
کلیدواژه‌ها
عنوان مقاله [English]
Effect of plasma spray parameters on the microstructure anddielectric properties of barium titanate coating
نویسندگان [English]
- Amir hossein Pakseresht 1
- Mohamadreza Rahimipour 2
- M.R. Vaezi 3
- Mehdi Salehi 4
1 Department of Ceramics, Materials and Energy Research Center
2 Department of Ceramics, Materials and Energy Research Center
3 Department of Materials Engineering, Isfahan University of Technology, Isfahan
4 Department of Materials Engineering, Isfahan University of Technology, Isfahan
چکیده [English]
In this research, Barium titanate thick film was produced by thermal spray method on stainless steel
substrate. Morphology and structure properties of BaTiO3 coatings prepared by atmospheric plasma spraying were
evaluated using scanning electron microscope (SEM) and X-Ray diffraction (XRD) techniques, respectively. According
to the results, parameter optimization has been shown to play a critical role in the deposition of these materials as thin
structurally homogeneous deposits. Based on XRD results, the sprayed films were predominantly polycrystalline but
contained an amorphous second phase. The crystalline/amorphous ratio is directly related to the dielectric properties of
the layer, with greater crystallinity giving higher values of dielectric constant. Microcracks and splat/splat interfaces are
also believed to adversely affect the dielectric properties. The maximum dielectric constant (k) values achieved using
the APS method for deposition is in the range of 70–115. Dielectric constant values changed to 160-180 after heat
treatment.
کلیدواژه‌ها [English]
- Dielectric Constant
- Amorphous Phases
- BaTiO3
- Plasma spraying
- Splat
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