نوع مقاله : مقاله یادداشت پژوهشی

نویسنده

استادیار، پژوهشکده سرامیک، پژوهشگاه مواد و انرژی، کرج، ایران

چکیده

در این پژوهش، تغییر ساختار نفلین سینیت (Neph) که متشکل از دو کانی نفلین و میکرو‌کلین است، با استفاده از دو روش هیدروترمال و آسیاب به‌ترتیب در حضور 2 درصد مولی سود(NaNeph)  و 30 درصد وزنی آهک(CaNeph)  بررسی شد. نتایج پراش اشعه ایکس و طیف رامان نشان داد که ساختار میکروکلین در نمونه CaNeph، پایدارتر است و ساختار نفلین تا حدودی تخریب می‌شود و در نمونه NaNeph، پیک‌های اصلی مشخصه کانی نفلین در 28 درجه نسبت به نمونه CaNeph حفظ می‌شود؛ در CaNeph، به‌دلیل سه ساعت آسیاب، با ورود عناصر قلیائی خاکی به ساختار حلقوی، نظم ساختاری حلقه‌های آلومیناسیلیکاتی نسبت بهNeph  بالاتر می‌شود. در نهایت، در تهیه شیشه با ترکیب شیمیایی 6 درصد وزنی Al2O3 - 5/65 درصد وزنی SiO2 – 13 درصد وزنی Na2O – 16 درصد وزنی CaO، از هر سه نمونه نفلین به میزان 25 تا 38 درصد وزنی (بسته به ترکیب نهایی) استفاده شد. تفاوت رفتار حرارتی شیشه‌های GCaNeph،GNaNeph  و GNeph به‌وسیله آنالیز حرارتی همزمان (DTA/TG) و تغییرحجم‌سنجی (دیلاتومتری) مقایسه شد. دمای انتقال به شیشه در نمونه‌های GCaNeph وGNaNeph  نسبت به نمونه بدون فراوری (GNeph) به‌ترتیب 37 و 25 درجه سلسیوس افزایش یافت. مقاومت شیمیایی شیشه‌های GCaNeph وGNaNeph  در پژوهش حاضر، 4 برابر بیشتر از GNeph و تراکم ساختار شیشه CaNeph نسبت به GNeph، 9/0 گرم بر سانتی‌متر مکعب بیشتر بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of Glass Preparation using Processed Nepheline Syenite from Kaleybar, Iran

نویسنده [English]

  • Aida Faeghinia

Assistant Professor, Department of Ceramic, Materials and Energy Research Center, Karaj, Iran

چکیده [English]

In this study, the change of the structure of Nepheline (Neph) (including two minerals, syenite and microcline) was studied, using hydrothermal and milling methods by the 2 % mol. soda (NaNeph) and 30 wt % lime (CaNeph), respectively. The X-ray diffraction and Raman spectra show that, the structure of the microcline phase in the (CaNeph) sample remained stable but the structure of Nepheline was somewhat degraded. The main characteristic XRD peaks of Nepheline in the NaNeph sample at 28º stayed compared to the CaNeph one. According to Raman spectroscopy the structural order of alumina-silicate rings in CaNeph sample was higher than Neph due to the 3 hs. milling and entering of the alkaline earth elements into the ring structure. Finally, Nepheline bearing glass samples with chemical composition of 6 wt % Al2O3-65.5 wt % SiO2-13 wt % Na2O-16 wt % CaO were used. The amounts of used Nepheline in the composition of glasses were 25 to 38 % by weight (depending on the final composition). The difference in thermal behavior of GCaNeph, GNaNeph and GNeph glasses was compared by means of thermal analysis (DTA/TG) and volumetric change (dilatometry). The glass transition temperatures were 25, 37 ºC increased in GCaNeph and GNaNeph compared to Neph samples (without processing) respectively. The chemical resistance of GCaNeph and GNaNeph glasses in the present work was 4 times higher than GNeph. The density of GCaNeph glass in the present work was 0.9 g/cm3 higher than GNeph.

کلیدواژه‌ها [English]

  • Nepheline
  • Glass
  • Structure
  • Processing
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