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Iranian Journal of Materials Science and Engineering، جلد ۹، شماره ۲، صفحات ۵۰-۵۸
عنوان فارسی
چکیده فارسی مقاله
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عنوان انگلیسی INFLUENCE OF NANO SILICA ON PROPERTIES AND MICROSTRUCTURE OF HIGH ALUMINA ULTRA-LOW CEMENT REFRACTORY CASTABLES
چکیده انگلیسی مقاله Colloidal silica bonded refractory castables have been developed recently. It was found that colloidal silica is one of the best binders can substitute other binders such as cement in No Cement Castable (NCC) and Ultra Low Cement Castable (ULCC) refractories. Also composition of colloidal silica with appropriate additives resulted in a gel form which makes the initial strength. Moreover, the nano size silica particles are extremely reactive in high alumina castables and may encourage the mullite formation in the microstructure. In the current study, four castables were prepared. The sample containing 6wt % microsilica was a reference, then microsilica was replaced by different amount of colloidal silica (2.5, 5, 7.5 wt %). Silica and water content was kept constant. It’s concluded that the castables containing the optimum amount of silica sol shows remarkable increase in both castable fluidity and mechanical strength (CCS and MOR) in dried and sintered state. It was also found that nanosilica particles increase the rate of needle-shaped mullite formation during sintering at 1400°C. According to FTIR results, the addition of Calcium Aluminate Cement (CAC) to the silica sol may be responsible for the increment of siloxane bridges (Si-O-Si).
کلیدواژه‌های انگلیسی مقاله Refractory castable, Colloidal silica, Gel, Siloxane bridge
نویسندگان مقاله h یعقوبی | h yaghoubi
1 department of metallurgy and ceramic, iran university of science and technology, tehran, iran.

سازمان اصلی تایید شده: دانشگاه علم و صنعت ایران (Iran university of science and technology)

حسین سرپولکی | h sarpoolaky
1 department of metallurgy and ceramic, iran university of science and technology, tehran, iran.

سازمان اصلی تایید شده: دانشگاه علم و صنعت ایران (Iran university of science and technology)

f گلستانی فرد | f golestanifard
1 department of metallurgy and ceramic, iran university of science and technology, tehran, iran.

سازمان اصلی تایید شده: دانشگاه علم و صنعت ایران (Iran university of science and technology)

سوری | a souri
2 malayer university, malayer, iran.

سازمان اصلی تایید شده: دانشگاه ملایر (Malayer university)

نشانی اینترنتی http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3-169&slc_lang=en&sid=en
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کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده گروه مهندسی مواد . مباحث ویژه
نوع مقاله منتشر شده Research paper
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