DE1929596A1 - Permeable, cast mould of gel-sintered - material for casting and extruding ceramic - Google Patents

Permeable, cast mould of gel-sintered - material for casting and extruding ceramic

Info

Publication number
DE1929596A1
DE1929596A1 DE19691929596 DE1929596A DE1929596A1 DE 1929596 A1 DE1929596 A1 DE 1929596A1 DE 19691929596 DE19691929596 DE 19691929596 DE 1929596 A DE1929596 A DE 1929596A DE 1929596 A1 DE1929596 A1 DE 1929596A1
Authority
DE
Germany
Prior art keywords
casting
gel
permeable
filler
sintered
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
DE19691929596
Other languages
German (de)
Inventor
Franz Schellberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19691929596 priority Critical patent/DE1929596A1/en
Publication of DE1929596A1 publication Critical patent/DE1929596A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/007—Continuous combustion chambers using liquid or gaseous fuel constructed mainly of ceramic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/346—Manufacture of moulds
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/22—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in calcium oxide, e.g. wollastonite

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mold Materials And Core Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The moulds which can also be used for vacuum, plastic and RAM oressing, produced from needle-shaped filler (Wollastonite) containing liquid and liquefying agents, specif. 1-2.5% aqueous 1-hydroxy ethane 1.1-diphosphonic acid. Pref. highly concentrated silicic acid sol is used for cold-binding. The used mould material is reused as a filler.

Description

Patentbeschreibung: "permeable Formen auf Gel-Sinterbindungs nach dem Gießverfahren" 1. Schlicker Nadelige ! Kristalle z.B. Wollastonit (Ca SiO3)-Mineral werden mit 10-20 % einer gemahlenen Fritte und Wasser zu einem Schlicker angeteigt. Anteil der Fritte und Korngrößenverteilung des Füllstoffes bestimmen die angestrebte Porengrößenverteilung und thermische so wie mechanische Eizenschaften. Durch Zugabe von AllipÄ.t.;?nMOhen von 1-2,5% einer 60%igen Lösung zu Wollastonitschlickern werden diese verflüssigt, anwesende Karbonate zerstört und der PH-Wert auf 7 - 7,5 gebracht. Dieser Schlicker ist unbegrenzt haltbar und wird zweckmäßig in großen Portionen hergestellt.Patent Description: "Permeable forms on gel-sintered bond According to the casting process "1. Schlicker Needle-like! Crystals, for example wollastonite (Ca SiO3) mineral, are made into a paste with 10-20% of a ground frit and water. The proportion of the frit and grain size distribution of the filler determine the desired pore size distribution and thermal as well as mechanical Properties by adding AllipÄ.t.;? NMOhen From 1-2.5% of a 60% solution to wollastonite slips, these are liquefied, the carbonates present are destroyed and the pH value is brought to 7 - 7.5. This slip has an unlimited shelf life and is expediently produced in large portions.

2. Kaltbinder O-Kieselsäureester werden mit 1%iger Pa unter Verwendung von Netzmitteln hydrolysiert. So entsteht eine saures (PH 3,5) Kieselsäuresol mit 25 - 30% SiO2 das etwa 6 Std.2. Cold binders O-silicic acid esters are used with 1% Pa hydrolyzed by wetting agents. This creates an acidic (pH 3.5) silica sol with 25 - 30% SiO2 that takes about 6 hours.

verwendbar ist. is usable.

3. Kaltbindung Schlicker nach 1. und Kaltbinder nach 2. werden gründlich gemischt und binden je nach eingestelltem PH-Wert des Schlickers in bestimmten Zeiten ab. Minimal 5 Minuten maximal mehrere Stunden. SiO2 aus dem Binder 2 - 5% auf Feststoff bc2o9' 4. Formgebung Das nach 3. hergestellte Gemisch wird in mit Wachs isolierte MetalL- oder Kunstharzformen gegossen und zuged,eck bei 50 - 600 temperiert. Das aus dem System austretende "Schwitzwasser" so wie die eintretende Trockenschwindung Lösen die Form von der Einrichtung. Mittels e eines leichten Luftstromes in die gebildete Spalte läßt sich das Teil gut; entnehmen.3. Cold binding slip according to 1. and cold binding agent according to 2. become thorough mixed and bind in certain times depending on the set pH value of the slip away. Minimum 5 minutes, maximum several hours. SiO2 from the binder 2 - 5% on solids bc2o9 '4. Shaping The mixture produced according to 3. is isolated in with wax Metal or synthetic resin molds cast and closed, corner temperature controlled at 50 - 600. That "Condensation" leaking out of the system as well as the entering dryness shrinkage Detach the shape from the facility. By means of a gentle stream of air into the formed column lets the part go well; remove.

Eine forcierte Trockiiung entfernt das restliche Wasser. Forced drying removes the remaining water.

5. Sinterung Das gut getrocknete Teil wird oxidierend 2 Stunden lang auf 9000C gebrannt. Die Fritte bewirkt eine lokale Verschmelzung des Füllstoffess Sie ist so gewählt, daß sie hinsichtlich thermischer, mechanischer und physikalischer Eigenschaften zum Füllstoff passt.5. Sintering The well-dried part is oxidized for 2 hours Fired at 9000C. The frit causes the filler to fuse locally It is chosen so that it is thermal, mechanical and physical Properties matches the filler.

6. Allgemeine Beschreibung des fertigen Stückes Nach der Sinterung ist die Form einsatzbereit.- Ihre Daten liegen so: Wasseraufnahme: 30-40 Gew.% Diffusionskoeft: 25-35 .10 2cm2 s Porosität : 30-50 % Oberflächenhärte: 400-700 cm Poren Maximum: 8-15 E Modul 0.8-1,5 .10 cm Gesamtschwind. 3-6 % Gasdurchlässigkeit 5-15 nano Perm 7. Wiederverwendung gebrauchter Formen Gebrannte Formen werden mit einer Hammermühle zerkleinert.6. General description of the finished piece after sintering the form is ready for use - your data are as follows: water absorption: 30-40 wt.% diffusion coefficient: 25-35 .10 2cm2 s porosity: 30-50% surface hardness: 400-700 cm maximum pores: 8-15 E module 0.8-1.5 .10 cm total shrinkage. 3-6% gas permeability 5-15 nano Perm 7. Reuse of used molds Burned molds are made with a hammer mill crushed.

Das Mehl wird gesichtet und ist wieder als Füllstoff einsetzbar. The flour is sifted and can be used again as a filler.

Der Patentschutz soll die Herstellung nach dem Gießverfahren unter Berücksichtigung der Si02 Gel-Kaltbindung und der Fritte-Sinter-Bindung betreffen. The patent protection is supposed to include the production by the casting process Consideration of the Si02 gel cold bond and the frit-sinter bond.

Claims (4)

P 19295966 "permeable Formen auf Gel-Sinter#ungsbasis nach demP 19295966 "permeable forms based on gel sintering according to the Gießverfahren" Patentanspruch: 1. Verfahren zur Herstellung permeabler Formen auf Gel-Sinterbifldungs) nach dem Gießverfahren für alle in der Keramik üblichen Formggebungsarten wie konventioneller Schlickerguß, SchlickerdruckguB auch kombiniert mit Vakuum, Ein- und Überdrehen, plastisches Pressen sowie RAM-Pressen dadurch gekennzeichnet, daß nadelige Füllstoffe z.B. Wollastonit mit Flüssigkeit und Verflüssigungsmittel z.B. 1 % - 2,5 obige wässrige Lösung von l-Hydroxyäthan l,-diphosphonsäure verwendet werden.Casting process "claim: 1. Process for the production of permeable forms on gel-Sinterbifldungs) after the casting process for all types of shaping customary in ceramics such as conventional slip casting, slip pressure casting also combined with vacuum, turning in and over turning, plastic pressing and RAM pressing characterized in that needle-like fillers, for example Wollastonite with liquid and liquefying agent eg 1% - 2.5 above aqueous solution of l-hydroxyethane l-diphosphonic acid can be used. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Kaltbindung ein hochkonzentriertes Kieselsäuresol verwendet wird.2. The method according to claim 1, characterized in that for cold bonding a highly concentrated silica sol is used. 3. Verfahren nach Anspruch 1 dadurch gekennzeichnet, daß die Verfestigung durch Versinterung mit einer Fritte der Form vorgenommen wird.3. The method according to claim 1, characterized in that the solidification by sintering with a frit of the form is made. 4. Verfahren nach Anspruch 1, dadurch gekennzerhnet, daß gebrauchtes Formenmaterial wieder als Füllstoff eingesetzt werden kann.4. The method according to claim 1, characterized gekennzerhnet that used Mold material can be used again as a filler.
DE19691929596 1969-06-11 1969-06-11 Permeable, cast mould of gel-sintered - material for casting and extruding ceramic Pending DE1929596A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19691929596 DE1929596A1 (en) 1969-06-11 1969-06-11 Permeable, cast mould of gel-sintered - material for casting and extruding ceramic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691929596 DE1929596A1 (en) 1969-06-11 1969-06-11 Permeable, cast mould of gel-sintered - material for casting and extruding ceramic

Publications (1)

Publication Number Publication Date
DE1929596A1 true DE1929596A1 (en) 1970-12-17

Family

ID=5736671

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19691929596 Pending DE1929596A1 (en) 1969-06-11 1969-06-11 Permeable, cast mould of gel-sintered - material for casting and extruding ceramic

Country Status (1)

Country Link
DE (1) DE1929596A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577162A1 (en) * 1985-02-13 1986-08-14 Mnk Rakennus Oy PROCESS FOR MANUFACTURING MOLDS
EP0936199A2 (en) * 1998-02-16 1999-08-18 ALFATEC Feuerfest-Faser-Technik Ges.m.b.H. Process for the manufacture of vacuum-formed refractories and insulating bodies for high temperature insulation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2577162A1 (en) * 1985-02-13 1986-08-14 Mnk Rakennus Oy PROCESS FOR MANUFACTURING MOLDS
EP0936199A2 (en) * 1998-02-16 1999-08-18 ALFATEC Feuerfest-Faser-Technik Ges.m.b.H. Process for the manufacture of vacuum-formed refractories and insulating bodies for high temperature insulation
EP0936199A3 (en) * 1998-02-16 1999-12-15 ALFATEC Feuerfest-Faser-Technik Ges.m.b.H. Process for the manufacture of vacuum-formed refractories and insulating bodies for high temperature insulation

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