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RISS 인기검색어
- 검색키워드
- 저자 : Saeid Baghshahi (검색결과 3 건)
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The role of Sb2O3 on the physical and structural properties of PbO-SiO2 glasses
Negin Allahmoradi,Saeid Baghshahi,Masoud Rajabi 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.9
Lead glasses are widely used in nuclear applications, particularly for shielding purposes. In this research, glasses with thegeneral composition of 65PbO·(35-x)SiO2·xSb2O3, where x = 0, 1, 2, 3, 4 and 5 were produced using the conventional methodof melting and casting. The physical properties of the glasses were investigated using optical and electron microscopy, thermalanalysis and FT-IR methods. The experiments showed that duo to phase segregation, the samples containing 4 and 5 molarof Sb2O3 were not completely glassy. The results revealed that with the rise of Sb2O3 content, the glass density increased from6.33 to 6.95 g.cm−3. Based on the thermal and FT-IR analyses, with increasing the amount of Sb2O3, antimony entered the glassstructure with the formation of Si-O-Sb bondings. Consequently, in lower amounts, Sb2O3 acted as fining agent, resulting inthe reduction of the bubbles from about 1.8 to 0.7 vol.%, while when present in amounts exceeding 2 mole%, the bubblecontent slightly increased.
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Farzan Karimi,Saeid Baghshahi,Mohsen Nouri Khezrabad,NASTARAN RIAHI-NOORI 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
In tile and ceramic industry, frits are used for producing opaque and glossy glazes. Commonly used frits are prepared by using opacifiers such as ZrO2 and TiO2, but the high price of these raw materials leads to a higher cost of the final product. In this research, an opaque frit containing in-situ synthesized Wollastonite (CaSiO3) and Diopside (CaMgSi2O6) was developed as a substitute for Zircon-containing frits. By choosing optimized proportions of oxides in the frit composition, sufficient crystallization occurred in MgO-CaO-Al2O3-ZnO-B2O3-SiO2-K2O-Na2O glass ceramic system. XRD, SEM, EDS, STA, and colorimetry (CIELab) tests were used to compare the prepared samples with a reference zircon containing one which is used in tile industry. The results showed that whiteness and glossiness indices of the prepared sample were 73.61 and 86.56, respectively, which are comparable with those of zircon-free reference sample with whiteness and glossiness indices of 77.05 and 89.22, respectively.
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Omid Khanali,Masoud Rajabi,Saeid Baghshahi 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.10
In this paper, yttria-stabilized zirconia (YSZ) was coated on Fecrralloy as thermal barrier coatings (TBC) using electrophoretic deposition (EPD) by various non-aqueous solvents. The solvents in the suspensions were varied in order to optimize kind of solvent and experimental conditions to achieve smooth and crack-free YSZ coatings. The effects of EPD parameters variations including solvents, sedimentation height, zeta potential, particle size, pH, deposition weight have been studied. Moreover, SEMand micro-hardness tests have been used to evaluate hardness and morphology of the samples. In comparison of the coatings created by various solvents, it was found that the use of acetyl-acetone with 0.4 g/l I2 produces a uniform, smooth and crackfree surfaces. Also the use of this solvent led to stable state, narrow particle size distributions and higher zeta potential in suspension in compare with the other solvents. The experimental results revealed that stability of suspensions were requiredfor obtaining high quality coatings, and particle coagulation could result in coatings with low green density and poor sinterability. It was also found that deposition yield in stable suspensions was higher. According to the results obtained from the statistical analysis by depositions time, it was found that the deposition rate decreases by an increase in deposition time.
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