فیلتر پرس(زبان اصلی) FILTRATION OF CERAMIC
he filtration mechanics of the slip castmg and filter pressing ceramic formillg ro cesses are analyzed so that better c mtrol can be achieved over these plOcesscs. The rheological behaviour of alumina suspensions with dlfferent solids loadmgs, particle size distributions and amounts of deftocculant as weIl as the effects thal lhcsc suspensions have on the filtration process were studied. During slip casting the formatiOn of the filter cake occU! s as Ct rcsult of tht’ capillary suction pressure of the pores in the plastel’ of Pal is molds. Thetcfore, th<, mold microstructure, density, permeabiIity, suction pressure and the effccts tbat thes(‘ mold properties have on the filtration process are analyzed as a function of thc pleL<iter 1 water ratio used to form the molds. During filtration, as the cake thlckness increases with casting time, fine partlcl<‘~ can be carl’ied along with the filtrate and deposited within the filtcl ccike and/ol filtel medium thereby clogging and reducing the permeabilities of the POI()U~ mecha Thl~ in turn affects the growth rate as well as the permeabihty, density and pOJ’O~ity of the cake. Evidence of cake and filter medium c10gging was obtained by’ (1) SEM analysis of cakes and filter media, (2) surface area measurements of CI’OS~-scctIOU~ of cakes, and (3) measurements of cake thickness as a function of ca5ting tlmf’.