摘要:
A method is described for manufacturing a titanium-dioxide-containing ultrafiltration membrane by crystallization of a titanium hydroxide sol in the presence of a metal oxide having essentially the rutile structure, such as tin dioxide, followed by thermal treatment. A description is also given of a heat-resistant ultrafiltration membrane having a mean pore size between 3 and 100 nm and a porosity of at least 10%, composed of metal oxides which have essentially the rutile structure, the metal oxides containing 60-90 mol% titanium dioxide and 10-40 mol% tin dioxide and possibly aluminium oxide in addition.
摘要:
Method for the manufacture of a ceramic membrane for micro- or ultra-filtration, wherein a porous inorganic material is formed on a bulk surface of a porous ceramic substrate. The method comprises the steps of
a) at least partly filling the pores of a porous ceramic substrate with a liquid first reagent, and b) bringing a bulk surface of the substrate into contact with a second reagent. The first and second reagents are chosen such that at their interface they interact to form a deposit in situ on the bulk surface of the substrate. The substrate and the deposit thereon are then dried and heated to sinter the deposit to form the porous inorganic layer as a layer extending in its thickness direction away from the bulk surface.
摘要:
Apparatus for processing a liquid substance, in particular a foodstuff, which apparatus comprises a seat (4) and a valve (3), the latter being suitable for acting together with the seat (4), whereby during operation the liquid substance is forced through between the valve (3) and the seat (4), whereby the seat (4) and at least the part of the valve (3) which during operation comes close to the seat (4), and in certain applications an impinging ring (5) in the vicinity of the valve's seat (4) consist of advanced ceramic material.
摘要:
A roller for transporting hot objects, comprises a cylindrical steel core (2) and on the core a plurality of annular elements (3) for contacting the hot objects which elements are slidable axially along the core and each comprise a refractory filling (10) and an outer hard surface material (9). To prevent tensile stresses and provide long life, the outer hard surface material is a jacket (4) of an industrial ceramic material and between each adjacent pair of the annular elements (3) there are means on the core (2) for maintaining the elements spaced apart in the form of at least one annular disc (12) of diameter less than the elements (3).
摘要:
In the manufacture of a ceramic membrane for micro-filtration having a porous ceramic carrier and a ceramic micro-filtration coating on a bulk surface of said carrier, the steps are performed of
(i) silanising said carrier at least at said bulk surface thereof, (ii) after step (i), applying a coating film containing metal oxide to said bulk surface of said carrier by contacting a stable suspension of non-agglomerated metal oxide particles with said bulk surface and moving said suspension along said bulk surface, so that said coating film remains adhering to said bulk surface, and (iii) drying and heating said carrier and said coating film thereon, so as to sinter at least said coating film and thereby form said micro-filtration coating on said carrier. In order to improve the uniformity and evenness of the coating film of the suspension, the stable suspension contains an organic additive which increases the yield stress of the stable suspension to a value greater than zero. The organic additive is one which is capable of giving said stable suspension a yield stress of at least 0.1 Pa at a concentration of not more than 5% by weight of the liquid component of the suspension without causing agglomeration of the particles.
摘要:
A skate for ice-skaing has a skate-blade (2), consisting wholly of ceramic material which may be fibre-reinforced. The hardness and low thermal conductivity of ceramic material gives improved skating performance. Suitable materials are aluminium titanate, aluminium zirconate, zirconia silicon nitride, silicon carbide and sialon.