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Mullite fibers prepared by a sol-gel method using tartaric acid
Hongbin Tan 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.5
Long mullite fibers were prepared by a sol-gel method using aluminum nitrate, tartaric acid and tetraethylorthosilicate (TEOS). Thermogravimetry-differential scanning calorimetry (TG-DSC), Fourier transform infrared (FTIR) spectrometer, Xray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the properties of the gel and ceramic fibers. The fibers with a uniform diameter were obtained by sintering at 1200 ο C, and theirs main phase was indentified as mullite.
Alumina phase transition and morphology development in a flux by adding silica
Hongbin Tan 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.6
Copper indium diselenide (CIS) layers, which are now showing promise as solar-cell materials, were successfully grown on GaAs (100) substrates using the hot wall epitaxy (HWE) method. The photoconductive CIS layers were grown along the direction having a beneficial gain for solar energy conversion. From the Hall effect measurements, the mobility tended to decrease as a function of T-3/2 in the high temperature range (T > 130 K), and increase as a function of T3/2 in the a low temperature range (T < 50 K). Also, from the photocurrent (PC) measurements, three peaks, A, B, and C, corresponded to the intrinsic transition from the valence band states of Γ7(A), Γ6(B), and Γ7(C) to the conduction band state of Γ6, respectively. The temperature dependence of the optical band gap obtained by the PC measurements could be expressed by using the empirical equation Eg(T) = Eg(0) - (8.57 × 10-4)T2 /(T + 129). By conducting solar cell fabrications, a 14.3% efficiency for n-CdS/p-CIS heterojunction solar-cells was achieved. This achievement suggests that the improved quality of the absorber layer, grown using the HWE method, contributes to the high performance of CIS solar cells.
Changrong Liu,Hongbin Tan,Aiguo Zheng,Xiangmei Kang,Ao Jiang,Rui Fang,Haorong Ren,Wanwei Fang 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
The manufacture of sodium sulfide through a carbon reduction process, using sodium sulfate as raw material, generatessodium sulfide by-product sediment, which has potential health and environmental impacts. Herein, a novel strategy isproposed to recover sodium oxide from the sediment by using acidic treatment and the influence of solution pH on sodiumoxide content is systematically studied. The results reveal that the sodium oxide content decreases with decreasing pH valueof the solution. At pH = 4, the as-treated sediment results in Na2O content of 3.10 wt. %, which recovery rate is about 90%. Furthermore, the influences of sintering temperature and time on compressive strength and bulk density are studied. Ingeneral, the compressive strength and bulk density increase with increasing sintering temperature and time. After sinteringat 1,300 oC for 120 min, the compressive strength and bulk density of the sintered porous ceramic are 26.66 MPa and 1.31 g/cm3, respectively. The porous ceramic, sintered at 1,300 oC, mainly consists of hauyne, gehlenite and hematite phases. Insummary, the few flaws in cell-walls result in high compressive strength of the as-prepared porous ceramics.
Preparation of anhydrous from red gypsum and effect of high strength gypsum on its properties
Changrong Liu,Lu Wang,Hongbin Tan,Faqin Dong,Xiaoling Ma,Feihua Yang 한양대학교 청정에너지연구소 2022 Journal of Ceramic Processing Research Vol.23 No.6
Red gypsum waste comes from titanium dioxide production by sulphuric acid method. Anhydrite was prepared from thewaste. The effects of calcined temperature on the properties of anhydrite were studied. The normal consistency of anhydritedecreased with the increase of calcined temperature, while the compressive strength firstly increase and then decrease. Theeffect of high strength gypsum on the properties of anhydrite was also studied. The normal consistency of sample decreasedwith the increase of high strength gypsum content, while the setting time firstly decrease and then increase, strength anddensity increased.