Method for producing monolithic, porous, ceramic shaped...

C - Chemistry – Metallurgy – 04 – B

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Details

C04B 38/00 (2006.01) B01D 39/20 (2006.01) B01D 69/10 (2006.01) B01D 71/02 (2006.01)

Patent

CA 2402550

The invention relates to a method for producing a monolithic, porous, ceramic shaped body and to the shaped bodies produced according to this method. Said shaped body is used predominantly as a support material for porous, inorganic and/or organic membranes for the flow filtration of liquids and gases. The aim of the invention is to provide a method for producing a shaped body consisting substantially of TiO2 with an open porosity > 10 %, an average pore size of between 1 and 50 µm and a mechanical stability > 20 N/mm2. To achieve this, a first TiO2-powder fraction is pre-sintered at temperatures > 1200 ~C and subsequently ground to achieve a screening refuse of at least < 5 % for grain sizes of less than 100 µm, at least an additional TiO2 powder fraction, whose grain size is significantly smaller than that of the first powder fraction, is added to and mixed with the granulate and the mixture obtained is compressed into a shaped body which is subjected to an additional sintering process at temperatures that are > 1100 ~C but lower than the first sintering temperature.

L'invention concerne un procédé de production d'une pièce moulée céramique poreuse monolithique et la pièce moulée ainsi obtenue qui sert essentiellement de matériau d'appui pour des membranes organiques et/ou inorganique poreuses destinées à la filtration à contre-courant de liquides et de gaz. L'invention vise à proposer un procédé permettant de produire une pièce moulée réalisée essentiellement en oxyde de titane (TiO¿2?) ayant une porosité ouverte > 10 %, des pores d'une taille moyenne comprise entre 1 et 50 µm et une résistance mécanique > 20 N/mm?2¿. A cet effet, une première fraction de poudre de TiO¿2? est préfrittée à des températures > 1200 ·C puis broyée pour obtenir un refus de tamis inférieur à 5 % pour une granulométrie inférieure à 100 µm. Ces granulés sont mélangés à au moins une autre fraction de poudre de TiO¿2? dont la grosseur des grains est nettement inférieure à celle de la première fraction de poudre. Le mélange ainsi obtenu est comprimé pour donner une pièce moulée, laquelle est soumise à un autre procédé de frittage à des températures > 1100 ·C mais inférieures à la première température de frittage.

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