مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تاثیر پوشش Al2O3-TiO2 نانوساختار بر عملکرد پارچه ‌های الیاف کولار

نویسندگان
روح اله رحمانی فرد
داود عالی پور
گروه مهندسی نانوفناوری، دانشکده فناوری های نوین، دانشگاه علم و صنعت ایران
چکیده
در این تحقیق پوشش Al2O3- 13%wt.TiO2 از پودرهای اولیه نانومتری بر روی پارچه با الیاف کولار با استفاده از فرایند پاشش پلاسما اتمسفری (APS) رسوب داده شد. بررسی های ساختاری با استفاده از روشهای XRD و FESEM معرف حضور دو ناحیه متفاوت در ساختار پوشش بود: یک ناحیه کاملا ذوب شده، عمدتا از دانه‌های با میانگین اندازه 85 نانومتر با ترکیبی از Al2O3- γ و تیتانیم حل شده و ناحیه دیگر شامل ذراتی نیمه ذوب که از ساختار Al2O3- α پودر اولیه نیز برخوردار بود. بررسی آزمون های مکانیکی نشان دهنده بهبود خواص مکانیکی پارچه های پوشش یافته بود. نتایج بدست آمده از آزمون استحکام کششی پارچه، قبل و بعد از پوشش دهی نشان‌ داد که اعمال فرایند پوشش دهی پاشش پلاسما اتمسفری می تواند استحکام پارچه را به مقدار 60% افزایش دهد. نتایج آزمون ضربه سرعت بالا (V50) بر روی پارچه های پوشش یافته با الیاف کولار نیز به خوبی نشان داد که حد بالستیکی نمونه ها افزایش چشمگیری داشته است. نتایج این آزمون نشان داد که اعمال پوشش نانو ذرات سرامیکی روی پارچه های الیاف کولار می تواند باعث حذف تعدادی از لایه های الیاف بکاررفته و در نتیجه کاهش وزن صفحات زرهی با حفظ سطح تهدید مربوطه گردد.
کلیدواژه‌ها
پوشش Al2O3-TiO2
اسپری حرارتی
ضربه سرعت بالا
الیاف کولار

عنوان مقاله English

Effect of nanostructured Al2O3-TiO2 Coating on performance of Kevlar Fabric

نویسندگان English

Roohollah Rahmanifard
davood Alipour
department of nano technology engineering, school of advanced technologies, Iran university of science and technology
چکیده English

Since woven fabrics have uniqe characteristrics such as light weight, flexibility, high strength, etc. and they are also capable to be improved for mechanical properties by nano thechnology, it is expectal to gain more efficient composite using intrinsic properties of the ceramic nanoparticles and proper coating method. The uniqe properties of the nanoparticles such as high elastic modulus, high strength to weight ratio etc. as well as participating in defeat mechanisms agains external loadings, can be of the factors reinforcing the textiles. Al2O3-13%TiO2 coatings were deposited on Kevlar Fabric substrates from nanostructured powders using atmospheric plasma spraying (APS). A complete characterization of the feedstock confirmed its nanostructured nature. Coating microstructures and phase compositions were characterized using SEM, and XRD techniques. The microstructure comprised two clearly differentiated regions. One region, completely fused, consisted mainly of nanometer-sized grains of α-Al2O3 with dissolved Ti+4. The other region, partly fused, retained the microstructure of the starting powder and was principally made up of nanometer -sized grains of γ-Al2O3, as confirmed by FESEM. coatings were in average slightly lower than the values for nanostructured coating. The results of tensile testing on kevlar fabrics before and after coating showed that APS could improve tensile strength up to 60%. High velocity impact test (V50) performed on coated fabrics well indicated that their ballistic limit experienced a significant increase. In addition, the results of V50 showed revealed that APS can decrease final weight of new composite panel compared to plain polyetylen panel with identical protection level.

کلیدواژه‌ها English

Al2O3-TiO2 coating
Thermal Spray
High velocity impact
Kevlar Fabric
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مهندسی مکانیک مدرس
دوره 18، شماره 1
فروردین 1397
صفحه 131-140