توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱تحولات فازی و رفتار حرارتی ترکیب پیروفسفات کلسیم حاصل از سنتز حرارتی پودرهای هیدروکسی آپاتیت و شیشه های فسفاتی
نویسنده(ها): ، ، ،
اطلاعات انتشار: چهاردهمین کنفرانس مهندسی پزشکی ایران، سال
تعداد صفحات: ۶
The aim of this work was to investigate the phase transformations and the sinterability of calcium pyrophosphate (CPP), prepared from a mixture of hydroxyapatite (HA) and phosphate glass. Phase and micro–structural evaluation of the sintered samples as well as physical, chemical and thermal characterization of the starting materials were performed, using inductively coupled plasma (ICP), X–ray diffraction, scanning electron
microscopy (SEM), particle size measurement, simultaneous thermal analysis (STA) and density measurement. The bodies, sintered at low temperature (1000 – 1100 ºC), generated the β–CPP and α–CPP compounds, whereas at high temperature (1200 – 1250 ºC) the α–CPP phase was often identified. The reaction of the calcium methaphosphate and the HA particles appeared to be continuous and finished before the calcium methaphosphate melting.

۲لایه نشانی فلوئور– هیدروکسی‌ آپاتیت بر روی پایه تیتانیومی با استفاده از فرآیند سل – ژل
نویسنده(ها): ، ،
اطلاعات انتشار: چهاردهمین کنفرانس مهندسی پزشکی ایران، سال
تعداد صفحات: ۵
In this investigation, fluor–hydroxyapatite (FHA) film was deposited on a titanium substrate by sol–gel method. Triethyl phosphite, ammonium fluoride and calcium nitrate in ethanol solutions were used respectively as P, F and Ca precursors. Typical apatite structures were obtained for all coatings after dipping and subsequent heat treatment at 550, 700 and 800 ºC.
The coating layers were investigated with SEM, XRD and FT–IR spectroscopy. The XRD results showed that the coatings heat treated at 550 ºC were only composed of HA and FA but the rutile (TiO2) phase was also identified in the coatings heat treated at higher temperatures. In addition, the formation of fluor–hydroxyapatite was confirmed by FT–IR results. Despite of the similar granular microstructure of apatite in the samples heat treated at 550 and 700 ºC, the crystalline grains of rutile were clearly visible in the samples heat treated at 800 ºC.
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