کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1486001 | 1510550 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Infiltration under isostatic pressure of porous silica glasses with silica sols Infiltration under isostatic pressure of porous silica glasses with silica sols](/preview/png/1486001.png)
In this work a SiO2 matrix with more than 50% porosity was developed and infiltrated with a pure silica sol under isostatic pressure, as a prior step to the immobilization of radioactive waste using this technique. The silica glass was prepared through the acidic leaching of phase-separated and partially-sintered sodium–borosilicate glass powder compacts. Phase separation was promoted at different stages of the sintering process to obtain different total porosity or pore size distributions, which in all cases showed macro, meso and micropores. Infiltration leads to a significant increase in weight, reflecting the initial porosity of the substrates. Porosimetry techniques (Hg porosimetry and N2 adsorption isotherms) show that the silica sol fills practically all the pores with diameters over 3 nm. Preliminary sintering tests show that the infiltration technique lowers the sintering temperature by more than 150 °C.
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 32–35, 15 September 2006, Pages 3478–3483