PROCESS FOR PRODUCING OPEN-PORE SINTERED GLASS HAVING A LARGE OPEN PORE VOLUME, PARTICULARLY SUITABLE AS FILTERS FOR LIQUIDS AND GASES AT HIGH FLOW RATES

摘要

ABSTRACT OF THE DISCLOSUREThe present invention provides a process for produc-ing open-pore sintered bodies of glass having a large openpore volume that is particularly suitable as filter for liq-uids and gases at high flow rates. The invention also pro-vides open pore sintered glass produced by means of conven-tional processes, but wherein at pore volumes of more than 60%there are obtained bending strengths that are too low for useas filter medium. Furthermore, the broad distribution of thepore size and the manner in which the inner surface of thepores is structured are unfavourable for the filtration. Thenovel process is intended for providing open-pore sinteredglass having a large pore volume, high bending strengths andgood flow rates. In this process a starting granulated mate-rial of fine-grained glass powder, coarse-grained salt powderand binder is produced first, whereupon 5 to 20% by weight offine-grained glass powder are added to this starting granu-lated material and this paste is subjected to moulding. Themoulded body thus formed is then heated to the sintering tem-perature of glass and sintered, whereupon the salt is washedout of the sintered glass.