پوشش‌دهی نانوذرات کاربید سیلیسیم (SiC) بر روی کامپوزیت کربن ـ کربن به روش رسوب‌دهی الکتروفورتیک (EPD)
محورهای موضوعی : عملیات حرارتی
علی گلشنی عجب شیر
1
(دانشگاه تبریز)
حسین آقاجانی
2
(دانشگاه تبریز)
محمد جعفرپور
3
(دانشگاه تبریز)
سهند بهرنگی
4
(دانشگاه تبریز)
کلید واژه: پتانسیل زتا, رسوب‌دهی الکتروفورتیک, نانوذرات SiC, کامپوزیت کربن ـ کربن, پایداری سوسپانسیون,
چکیده مقاله :
هدف از این پژوهش بررسی پایداری نانوذرات SiC به‌منظور پوشش‌دهی بر روی کامپوزیت کربن ـ کربن به روش EPD می‌باشد. بدین منظور سوسپانسیون‌هایی در حلال‌های مختلف و در حضور پراکنده‌ساز PEI تهیه شدند. پایداری سوسپانسیون‌ها توسط تصاویر ماکروسکوپی تهیه شده از آن‌ها پس از گذشت 24 ساعت و اندازه‌گیری پتانسیل زتا و توزیع اندازه ذرات مورد بررسی قرار‌گرفت. در ادامه پوشش مورد نظر از سوسپانسیون بهینه بر روی زیر لایه اعمال شد. نتایج نشان داد که سوسپانسیون تهیه شده در اتانول، در pH=10 و در حضور 6 درصد وزنی PEI پایداری بهتری دارد. همچنین تصاویر میکروسکوپ الکترونی روبشی (SEM) نشان داد که پوشش اعمال شده در ولتاژ 30 ولت کیفیت بهتری داشته و دارای سطح یکنواخت و بدون حفره می‌باشد.
The aim of this research is to investigate the stability of SiC nanoparticles for deposition on C/C composite by EPD method. Thus, different suspensions were prepared with different solvents and in presence of PEI as dispersant. The stability of suspensions was studied by using their macroscopic pictures after 24 h, and measurement of zeta potential values and particle size distribution. Thereafter, the coating was applied onto the substrate using the optimized suspension. The results showed that the suspension prepared in ethanol, with pH=10 and addition of 6 wt% PEI has the best stability. Also, SEM micrographs revealed that the coating applied with the voltage of 30 V results in a better quality and has a uniform and pitiless surface.
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