توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱The role of silicon compounds in strengthen and density of Aluminasilicate based materials composites
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی کامپوزیت، سال
تعداد صفحات: ۶
This study describes the role of silicon compounds in strengthen and density of Aluminasilicate based materials composites. Two series of Aluminasilicate based materials composites were prepared from Iranian chamotte (Samples A) and Chinese bauxite(Samples B),as 65 wt.% in each case together with,15 wt.% SiC–containing material regenerates(crushed sagger) and 10 wt.% fine coke(a total of 90% aggregate) and 10 wt.% resole(phenol formaldehyde resin) as binder. A batch of 100 gr of mixture was provided and different quantities of additives were added. Physical and mechanical properties (bulk density, apparent porosity and cold crushing strength) are measured after a heat treatment of 2 hrs at 200 ºC and reheating at 1100 ºC and 1400 ºC for 2 hrs. The paper describes the effect of additives on increasing of the cold crushing strength (CCS) and bulk density (B.D) in different cases. At low temperature of 200 ºC, Si and ferrosilicon contribute to the formation of stronger cross linking in the resit structure. At high temperature of 1400 ºC, SiC whiskers of nano sized diameter are formed due to the presence of Si and FeSi2 and improve the mechanical properties.<\div>

۲SEM AND TEM STUDIES ON CREEP DEFORMATION OF ALUMINA AND ALUMINA–CARBON NANO COMPOSITE DENSIFIED BY SPS
نویسنده(ها): ،
اطلاعات انتشار: اولین همایش بین المللی و ششمین همایش مشترک انجمن مهندسی متالورژی ایران، سال
تعداد صفحات: ۹
Spark plasma sintering method (SPS) has been studied as an alternative method to obtain dense finegrained ceramics at lower temperatures and at increased sintering rates. Regarding the alumina densification case, some compounds are well known to help during sintering at limiting also grain growth and resulting grain size (such as MgO and ZrO2). Many mechanical properties depend on the grain size, as the plasticity. As a matter of example the overall deformation capabilities of allceramics will be altered by SPS and by all grain growth limiting techniques, in particular alumina based ceramics. This study focuses on SEM and TEM microstructures of alumina materials creep deformed and on the beneficial effects of SPS and of introducing carbon particles in the aluminamatrix on limiting grain growth and on extending high temperature deformation plasticity for materials densified by SPS. Here are presented creep deformation results and deformation mechanisms of pure alumina (hereafter AP\SPS) and of carbon particles containing alumina based material (hereafter AC\SPS), both densified by SPS. Considering the SEM microstructures, thefineness of microstructure obtained by SPS is shown to be more effective when combined with carbon nano particles. Hence plasticity is eased for AC\SPS nano composite material.<\div>
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