WO1998048918A1 - Fabrication d'un filtre en mousse ceramique - Google Patents

Fabrication d'un filtre en mousse ceramique Download PDF

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Publication number
WO1998048918A1
WO1998048918A1 PCT/TR1997/000006 TR9700006W WO9848918A1 WO 1998048918 A1 WO1998048918 A1 WO 1998048918A1 TR 9700006 W TR9700006 W TR 9700006W WO 9848918 A1 WO9848918 A1 WO 9848918A1
Authority
WO
WIPO (PCT)
Prior art keywords
ceramic
mold
foam
case
production
Prior art date
Application number
PCT/TR1997/000006
Other languages
English (en)
Inventor
Nihat G. Kinikoglu
Seher Kinikoglu
Original Assignee
Kinikoglu Nihat G
Seher Kinikoglu
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kinikoglu Nihat G, Seher Kinikoglu filed Critical Kinikoglu Nihat G
Priority to PCT/TR1997/000006 priority Critical patent/WO1998048918A1/fr
Priority to AU27996/97A priority patent/AU2799697A/en
Publication of WO1998048918A1 publication Critical patent/WO1998048918A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/004—Retaining slag during pouring molten metal by using filtering means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B01D39/2093—Ceramic foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/086—Filters
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/0615—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms

Definitions

  • Conventional ceramic foam filters are prepared from an open cell, hydrophilic flexible foam material having interconnected voids surrounded by a web of said flexible foam material as described in U.S. Patent No. 3,893,917.
  • Foams have 2-25 pores per cm and must be able to burn at or below the firing temperature of ceramic material.
  • Dimensions of the foam material depends on the desired dimensions of the end filter material and generally have the thickness of 2 to 5 centimeters.
  • aqueous ceramic slurry which is employed naturally on the desired ceramic material for the chosen metal to be filtered. Slurry must have properties so that final product could withstand up to the molten metal with respect to chemical attack, mechanical strength and elevated temperature conditions. In addition, slurry should have relatively high degree of fluidity and be comprised of an aqueous suspension of the ceramic intended for use in the filter.
  • Typical ceramic materials which may be employed include alumina, chromia, zirconia, magnesia, titanium oxide, silica , silicon carbide and mixtures thereof. For use with molten aluminum and its alloys an alumina based slurry is quite satisfactory. For use an copper and its alloys, either zirconia or chromia are preferred.
  • the slurry contains from 10 to 40 % water.
  • Additives may be employed in the slurry such as binders and foam wetting agents.
  • the flexible foam material is then impregnated with the aqueous ceramic slurry so that fiber-like webs are coated therewith and the voids are filled therewith normally by simply immersing the foam in the slurry for a short period of time sufficient to insure complete impregnation of the foam.
  • impregnated foam then compressed to expel from 25 to 75% slurry while leaving the fiber like web portion coated therewith.
  • impregnated foam is passed through a preset roller to effect the desired expulsion of the slurry from the foam. Naturally this may also be done manually just squeezing the flexible material to the desired extend.
  • the impregnated foam is then dried at temperatures from 20 to 700°C and from 15 minutes to 24 hours. After drying, the sintered material is heated in one or two stages from 350 to 1600°C to sinter the ceramic coating on fiber like webs.
  • Resultant product is a fused ceramic foam having an open cell structure characterized by interconnected voids surrounded by a web of said ceramics with a density of less than 30% of the theoretical density of a ceramic material of the same size.
  • foam is hold in position until the organic substrate is decomposed, or preferably until ceramic is sintered.
  • the ceramic foam is prepared: Case 1. From an open cell flexible or non-flexible foam material having interconnected voids surrounded by a web of said foam material. Case 2a and 2b. From partly expanded spherical polystyrene beads packed in a mold having the desired shape.
  • typical foam material may be organic foams used in conventional foam filter production technique.
  • non-flexible foam material performs as well.
  • foam material is expandable polystyrene beads pre- expanded to the required sizes.
  • molds preferably made of plastics are connected to a central filling sprue (3) to which slip is poured while molds are spinning.
  • Slip properties such as composition and viscosity, depends on the type of the ceramic filter material and filter pore size as it is in the conventional foam filter production techniques.
  • Mold surface in the direction of centrifugal force have a filter paper or a gypsium plate (4) and a porous support(5). Fine mesh filter paper or a gypsium plate allows the water to drain out the slip and porous support supports the filter paper or gypsium plate.
  • Plastic foams are available in various pore sizes depending on properties of the molten metal and the slurry.
  • the rotational speed of the table and the rotation period are determined by foam pore or polystyrene bead size, slip slurry properties, ceramic filter (foam) dimensions, distance of the molds from the rotation axis on the table (centrifugal force) .
  • slip is introduced into the molds (1) similar to the ones described in Case 1 and Case 2a above, placed on a stationary or vibrating table packed with polystyrene beads (2).
  • a filter paper or a gypsum plate (4) are inserted between the beads and porous support (5). Water drains out by gravity force and ceramic slip fills the mold from an above reservoir through an opening at the top of the mold replacing the drained out material. Time of filling and draining in this case also depends on the bead and channel size and the ceramic slip properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne la fabrication de filtres en mousse céramique, ce qui consiste à: (cas N°1) introduire dans un moule de machine centrifuge à mouler un matériau de mousse à cellules ouvertes, souple ou non souple, la barbotine de céramique pénétrant dans le moule sous l'effet de la force centrifuge; (cas N°2) introduire dans un moule de machine centrifuge à mouler des granules sphériques de polystyrène partiellement expansé, la barbotine de céramique pénétrant dans le moule sous l'effet de la force centrifuge; (cas N°3) introduire dans un moule fixe ou vibrant des granules sphériques de polystyrène partiellement expansé, la barbotine de céramique étant introduite dans le moule depuis un réservoir placé au sommet. Dans tous ces cas, l'extrémité des moules, au niveau de laquelle la partie aqueuse de la barbotine de céramique est évacuée, est fermée, soit par un filtre en papier, soit par une plaque de gypse.
PCT/TR1997/000006 1997-04-29 1997-04-29 Fabrication d'un filtre en mousse ceramique WO1998048918A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/TR1997/000006 WO1998048918A1 (fr) 1997-04-29 1997-04-29 Fabrication d'un filtre en mousse ceramique
AU27996/97A AU2799697A (en) 1997-04-29 1997-04-29 Ceramic foam filter production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/TR1997/000006 WO1998048918A1 (fr) 1997-04-29 1997-04-29 Fabrication d'un filtre en mousse ceramique

Publications (1)

Publication Number Publication Date
WO1998048918A1 true WO1998048918A1 (fr) 1998-11-05

Family

ID=21621023

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TR1997/000006 WO1998048918A1 (fr) 1997-04-29 1997-04-29 Fabrication d'un filtre en mousse ceramique

Country Status (2)

Country Link
AU (1) AU2799697A (fr)
WO (1) WO1998048918A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046122A1 (fr) * 2000-12-07 2002-06-13 L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et Exploitation Des Procedes Georges Claude Procede de preparation d'un materiau ceramique de faible epaisseur a gradient de porosite superficielle controle, materiau ceramique obtenu
FR2826956A1 (fr) * 2001-07-04 2003-01-10 Air Liquide Procede de preparation d'une composition ceramique de faible epaisseur a deux materiaux, composition obtenue, cellule electrochimique et membrane la comprenant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187014A (en) * 1981-05-13 1982-11-17 Toyota Motor Corp Waste gas filter for internal combustion engine
EP0159963A2 (fr) * 1984-04-23 1985-10-30 Alusuisse-Lonza Services Ag Filtre en céramique avec une structure de mousse à cellules ouvertes
EP0369098A1 (fr) * 1988-11-17 1990-05-23 Hispano Quimica S.A. Procédé pour la préparation d'une mousse céramique renforcée

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187014A (en) * 1981-05-13 1982-11-17 Toyota Motor Corp Waste gas filter for internal combustion engine
EP0159963A2 (fr) * 1984-04-23 1985-10-30 Alusuisse-Lonza Services Ag Filtre en céramique avec une structure de mousse à cellules ouvertes
EP0369098A1 (fr) * 1988-11-17 1990-05-23 Hispano Quimica S.A. Procédé pour la préparation d'une mousse céramique renforcée

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT, Accession No. 83-00625K, Questel Telesystems (WPIL), DERWENT PUBLICATIONS LTD., LONDON; & JP,A,57 187 014 (TOYOTA MOTOR KK). *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046122A1 (fr) * 2000-12-07 2002-06-13 L'air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et Exploitation Des Procedes Georges Claude Procede de preparation d'un materiau ceramique de faible epaisseur a gradient de porosite superficielle controle, materiau ceramique obtenu
FR2817860A1 (fr) * 2000-12-07 2002-06-14 Air Liquide Procede de preparation d'un materiau ceramique de faible epaisseur a gradient de porosite superficielle controle, materiau ceramique obtenu, cellule electrochimique et membrane ceramique le comprenant
US7223356B2 (en) 2000-12-07 2007-05-29 L'Air Liquide, Société Anonyme à Directoire et Conseil deSurveillance pour l'Étude et l'Exploitation des Procédés Georges Claude Method for preparing a thin ceramic material with controlled surface porosity gradient, and resulting ceramic material
FR2826956A1 (fr) * 2001-07-04 2003-01-10 Air Liquide Procede de preparation d'une composition ceramique de faible epaisseur a deux materiaux, composition obtenue, cellule electrochimique et membrane la comprenant
WO2003004439A1 (fr) * 2001-07-04 2003-01-16 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de preparation d'une composition ceramique de faible epaisseur a deux materiaux, composition obtenue, cellule electrochimique et membrane la comprenant
US7332108B2 (en) 2001-07-04 2008-02-19 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Method of preparing a thin ceramic composition with two materials, the composition thus obtained and the constituent electrochemical cell and membrane

Also Published As

Publication number Publication date
AU2799697A (en) 1998-11-24

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