توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Studying the interaction of raw materials in Low Cement Spinel Castables
اطلاعات انتشار: یازدهمین کنگره سالانه انجمن مهندسین متالورژی ایران، سال
تعداد صفحات: ۱۰
In this study six different combinations of raw materials that have the potential
of being used in Low Cement Spinel Castables are investigated. These are
bauxite and calcined magnesite, calcined alumina and calcined magnesite,
refractory cement and microsilica, calcined alumina and microsilica, bauxite
and mill scale, calcined alumina and mill scale. Proper combinations of each
two are mixed with 6% water, pressed in a die, dried and fired for 2 hrs. at
1400 C, then the phases were studied by XRD. By considering refractory and
low melting phases, it could be concluded that bauxite is a stable aggregate that
can be used extensively and microsilica is a binder with problems which must
be reduced to a very low level. For in situ spinel formation of MgAl2O4,
calcined alumina and calcined magnesite combinations work the best and for
Hercynite (FeAl2O4) formation calcined alumina and mill scale are a suitable
combination.<\div>

۲A New Technology to Manufacture Alumina–Graphite Composite by Cold Isostatic Pressing
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۲
The most controlling parts of melt flow in continuous casting are Ladle Shroud (LS), Stopper (S) and Submerged Nozzle (SN). The common manufacturing method for the production of these parts is mixing of raw materials including alumina, graphite and suitable additives with a phenolic resin or pitch and shaping with Cold Isostatic Pressing (CIP), followed by firing at above 1000°C in the reducing atmosphere under the coke beds to develop carbon bond strengths. The aim of this project was studying the possibility of manufacturing these composites by using CIP of castables and employing hydraulic bonds of castables without a need to firing. This new technology gives economical advantages and feasibility of producing these parts in Iran. First the composition studies were performed for suitable physical and mechanical properties. The best composition at 400 bars pressure was found to be 55% alumina, 20% alumina cement, 15% graphite, 5% micro silica, 5% silicon carbide and 6–8 weight percent water above 100 w\o raw materials. Then the new manufacturing method was applied and the experimental results showed that this novel technique has developed samples which has similar properties to those produced by the conventional method outside Iran.<\div>

۳Physical and mechanical properties of low cement castable
نویسنده(ها): ، ،
اطلاعات انتشار: اولین همایش بین المللی و ششمین همایش مشترک انجمن مهندسی متالورژی ایران، سال
تعداد صفحات: ۵
A castable is a mixture containing gravel and one or more prepared glues. This research studied low–cement castable. X ray diffraction, scanning electron microscopy and spectrography were used to investigate elements and phases. Bulk density, apparent porosity and water absorption were measured. Results show that a castable composed of Bauxite, refractory cement, with suitable q=0.22 in Andreasen Equation for grain size yields the best performance. Bauxite base castable had mullite shape phases inside the pores respectively<\div>

۴Biocompatibility evaluation of bioglass nanoparticles to chondrocyte cells by isothermal microcalorimetry
اطلاعات انتشار: هفدهمین کنفرانس مهندسی پزشکی ایران، سال
تعداد صفحات: ۴
This study aimed at the biocompatibility evaluation of bioglass nanoparticles to chondrocyte cells using isothermal micro\nano calorimetry (IMNC), which is a new method to study cell\biomaterial interactions. For this purpose, 63S bioglass nanoparticles were made via sol–gel method and primary characterization was carried out on the particles. XRD analysis showed the amorphous structure of the glass and the particle size and morphology were investigated by SEM. Finally the bioglass nanoparticles’ biocompatibility with yeast and cultured humanchondrocyte cells was evaluated using IMNC. The results showed no deleterious effect on chondrocyte growth and they can grow, proliferate and live on beside bioglass nanoparticles. In another word, the obtained results from this study confirmed the growth, proliferation and viability of chondrocyte cells close to 63S bioactive glass nanoparticles at low concentrations.<\div>

۵Investigations on the Influence type of alumina solid state reaction of alumina and maganesia in bauxite–based refractory castables
نویسنده(ها): ، ،
اطلاعات انتشار: سومین کنفرانس بین‌المللی آلومینیوم ایران IIAC2014، سال
تعداد صفحات: ۴
In the present study, Investigations on the compressive strength of refractory castable and presents a comparison on the influence of five different types of alumina (Al2O3) on the mechanical strength were reported here. For this purpose, the influence of five types alumina on solid state reaction of alumina and magnesia in bauxite–based refractory castables on compressive strength were investigated. The results show that, the most effective material for the improving compressive strength is alumina reactive. Optimizing Content for maximum compressive strength were obtained at 4% reactive alumina. X–ray diffraction (XRD) analysis proved that all the samples consist of in situ spinel phase. The reactive alumina content was found to be the most influencing factor on in situ spinel formation.<\div>

۶Effects of Replacing Fluorine with Sodium and Titanium Oxides on Continuous Casting of Steel Mold Powders Lubrication
نویسنده(ها): ، ،
اطلاعات انتشار: journal of advanced materials and processing، سوم،شماره۱، ۲۰۱۵، سال
تعداد صفحات: ۸
Mold powders are used as raw materials in continuous casting of steel industry; Also they are mostly composed of aluminum, calcium, silica oxides, alkaline and earth–alkaline oxides along with carbon and fluor. Two of the most important duties of mold powders are the lubrication of the space between mold walls and steel shell, and heat transfer control between steel shell and the copper mold. Fluor is one of the most important constituents of mold powders and is employed to control viscosity in order to obtain favorable lubrication and solidification temperature control in order to control heat transfer. The fluor in the mold powder is added to it with the aid of some fluorided compounds like fluorine (CaF2). This study has used Fluorine to make a powder similar to the reference sample, with the use of portland cement clinker and fluorine. Moreover, groove viscometer studies have been conducted here to compare sample viscosities to the viscosity of the reference sample. In addition XRD as well as SEM analyses were conducted. As a result, crystalline phase of cuspidine was found in the glass matrix indicating that the chemical compound in sample 1 may be a suitable substitute, as compared to the reference sample, for the mold powder used in continuous casting steel industry.

۷Reinforcement of Glass Ionomer Cement: Incorporating with Silk Fiber
اطلاعات انتشار: journal of advanced materials and processing، چهارم،شماره۳، ۲۰۱۶، سال
تعداد صفحات: ۸
The aim of this study was to synthesis of glass ionomer–silk fiber composite and to evaluate the effect of adding natural degummed silk fiber on the mechanical properties of glass ionomer cement (GIC). For this purpose, natural degummed silk fibers with 1 mm in length and 13–16 µm in diameter were added to the ceramic component of a commercial glass ionomer cement in 1, 3 and 5 wt. %. Compressive strength (CS), three–point flexural strength (FS) and diametral tensile strength (DTS) of the prepared glass ionomer–silk fiber were measured. Analysis of variance (ANOVA) was used to compare the obtained results. Moreover, SEM technique was used for investigation of the surface morphology of as–prepared composite and fractured area. The results showed that the highest compressive strength, flexural strength and diametral tensile strength were obtained using 3, 3 and 5 wt. % of silk fiber, respectively. However, at 3 wt. % silk fiber, all three measures of strength exhibited a significant increase compared to the commercial GIC. Therefore, it can be suggested that the addition of 3 wt. % silk fiber to the ceramic component of GIC is desired for dental restorations and orthopedic implant applications, where the maximum strength in all three modes of loading would be beneficial.
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