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| Thousands of Egyptian-level preparation of porous glass
r24h. leachedat70 ℃ in1mot/LHCI) ... R = (8 / 9) (a / RT) V ~ d. C ・}. A surface energy,ugg boots billig, d. Coefficient of volume expansion of education, y of a particle volume fraction, C the equilibrium concentration of a man outside NaO rhyme;, with the heat treatment time, the porous glass by the surface area has decreased rapidly, as shown in Figure 8. 5. Thermal history of the pore size distribution of the shaggy do some glass in the natural cooling process will be serious phase, we observed after this point the relative aperture of Jun porous glass. № 2 samples to study. № 2a is a summary of the melt in the high air obtained by the natural Ling Farm white sample} № 2b is made of high-temperature melt quench water into a transparent glass. Both in the treatment phase 700 ~ C 24h, then at the same acid conditions of a 210 Volume 4 Inorganic Materials Management,moncler jackets, the obtained pore size distribution of porous glass dichotoma cut points shown in Figure 9, significant pore size distribution differences. Reason for this difference is due № 2a blind from the hot temperature of cooling occurred during the thistle phase caused. This phase is not in a correct temperature for Argentina,ugg boots günstig, and Korea is in the process of continuous cooling phase occurs because the size and heat treatment temperature, and therefore on pore size distribution of glass ranges from zero continuously to several thousand angstroms range. When the further phase heat treatment at 700 ℃, its role is to lead to the glass phase and the second phase particles to aggregate. Not able to change the state of continuous distribution. № 2b of the original glass is transparent, that the investment phase separation to occur. Therefore, after heat treatment at 700 ~ C obtained by the porous glass is very narrow pore size distribution,true religion, concentrated in the 800 or so. IV, Conclusion NaO-CaO - B {Oa-AliO-SiO: system glass can be prepared such porous glass glass emblem hole hole radius o ~ 3000, surface area for the 10NIS0m / g. Porous glass pore radius distribution, specific surface area not only with the original glass composition and heat treatment on the temperature and resistance, and thermal history of asking other factors. Control of these projects can be made of different elements and distribution of pore sizes and different specific surface area of porous glass. ● Covent Lei [1] Rayss, J. ctal,: Chmma ~ raphia, 17 (  1983:437 [2] Weetall,true religion jeans, H. H. : Bioehem, Biophys, Aeta, 212,1970: i 【3] Zhou Yuhua, Huang Xihuai, etc.; Ceramic Society, 12,1984; 1934] Tay] o /, P. : J. Ai] ne ~. CcrSoc,, 87,198 l186 [5 Tadao Nakashima, in the Bulletin of the Yu Yigong open license (A), Akira 37-140334 [6] Yang Xi: Shanghai Institute of Silicate by a graduate thesis, 1987 [7] Haller. W. : J. Chem. Phys. , 42,1965 | 686 [8] Lif5hitz. F: j. Phys. ChcmSo1ids, 19,1961:35 PreparationofPorousGlassYan $ Xl mouth, ldHua ~ $ XlIl''(ShahghaiInstituteofCeramics, AcademiaSintca) AbstractFromtheNa20 a CaO-B20a-AI203-SiO: system, por twenty u5glassesCallbeobtained. Wesystematicallystudiedtherelationofsoraefactorssuchmscompositionofglass. heattreatmenttemperatureandtimewiththeporesizeofporousglasspreparedfromthissystem. Thestudiesshowthattheporousglasswithporesizefrom50to3000. BETspecificsurfaceareasfroml0tol5Om/gcanbeobtainedbycontrollingthesefactors; Keywords, Posousglass; Phaseseparation, Preparation.
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