تاثیر عملیات حرارتی بر فازهای تشکیل شده شیشه-سرامیک 45S5 سنتز شده در حالت پودری و قرصی شکل و بررسی زیست فعالی آن‌ها
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
محمدرضا مسجدی
1
(کارشناسی ارشد، دانشگاه شیراز، دانشکده مهندسی، بخش مهندسی مواد)
بابک هاشمی
2
(دانشیار دانشگاه شیراز، دانشکده مهندسی، بخش مهندسی مواد)
کلید واژه: بیومواد, شیشه-سرامیک زیستی 45S5, شیشه سودالایم, واکنش در حالت جامد, زیست فعالی,
چکیده مقاله :
شیشه زیستی 45S5 به روش واکنش در حالت جامد با استفاده از شیشه سودالایم، کلسیم کربنات، سدیم کربنات و فسفر پنتااکسید سنتز شد. ترکیب شیشه سودالایم توسط آنالیز عنصری فلئورسانس پرتوی ایکس(XRF) تعیین شد و مقادیر مورد نیاز از سایر مواد اولیه برای رسیدن به ترکیب شیشه زیستی 45S5 محاسبه و به آن اضافه گردید. مخلوط پودرها به دو شکل پودر و قرص تهیه شده و تحت شرایط عملیات حرارتی مختلف (ºC800 تا ºC1000) قرار گرفت تا شیشه-سرامیک مطلوب به دست آید. با استفاده از پراش اشعه ایکس (XRD) و آنالیز حرارتی افتراقی (DTA) خواص فازی و حرارتی نمونه‌ها بررسی شد. دمای تبلور شیشه سنتز شده ºC690 تعیین شد. فازهای بلورین Ca2Na2Si3O9 و CaNaPO4 در تمام نمونه‌ها مشاهده شد. نمونه‌ها در محلول مشابه بدن (SBF) قرار گرفته و زیست فعالی آن‌ها به روش برون تنی (in vitro) با ارزیابی الگوهای پراش اشعه ایکس (XRD) و تصاویر میکروسکوپ الکترونی (SEM) مورد بررسی قرار گرفت. زیست فعالی نمونه‌ها با توجه به شناسایی لایه هیدروکسی آپاتیت تشکیل شده بر روی سطوح آن‌ها تایید گردید. نتایج نشان داد که دمای عملیات حرارتی نسبت به زمان آن تاثیر بیشتری بر تشکیل شدن فازهای بلورینه دارد و نمونه‌ی پودری‌ای که تحت شرایط عملیات حرارتی در دمای ºC1000 و مدت زمان 8 ساعت قرار گرفته، خواص زیست فعالی بهتری نسبت به نمونه‌هایی که در دمای پایین‌تر عملیات حرارتی شده‌اند دارند.
45S5 bioglass was synthesized by solid state reaction method using sodalime glass, calcium carbonate, sodium carbonate and phosphor pentoxide. XRF analysis was used to determine the glass composition, and Based on its results, the required amounts of other precursors were calculated and added to sodalime glass powder in order to obtain 45S5 composition. After that samples in the forms of powder and pellet were heat treated at different temperatures (800-1000ºC). DTA and XRD analysis were done to investigate thermal and phase properties of the samples. Crystallization temperature was determined to be 690ºC. Ca2Na2Si3O9 and CaNaPO4 crystalline phases were detected in all the samples. In-vitro bioactivity of samples was investigated by immersion of samples in SBF solution and further study of them by XRD and SEM analysis. Bioactivity of the samples was proved by determining HA layer formation on their surfaces. Results showed that Heat treatment temperature had more significant effect on the formation of crystalline phases than its time. Bioactivity of the sample heat treated at 1000ºC for 8hr was better than other samples heat treated at lower temperatures.
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