NO771482L - PORST COMPOSITIONAL MATERIAL AND PROCEDURE FOR ITS MANUFACTURE - Google Patents

PORST COMPOSITIONAL MATERIAL AND PROCEDURE FOR ITS MANUFACTURE

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Publication number
NO771482L
NO771482L NO771482A NO771482A NO771482L NO 771482 L NO771482 L NO 771482L NO 771482 A NO771482 A NO 771482A NO 771482 A NO771482 A NO 771482A NO 771482 L NO771482 L NO 771482L
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Norway
Prior art keywords
stated
aggregate
aluminum oxide
specified
fibers
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NO771482A
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Norwegian (no)
Inventor
Jean Daviot
Original Assignee
Novatome Ind
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Publication of NO771482L publication Critical patent/NO771482L/en

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    • 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
    • C04B28/34—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 cold phosphate binders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/02—Linings
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C04B28/34—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 cold phosphate binders
    • C04B28/342—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 cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more reactive oxides
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C04B35/10—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 aluminium oxide
    • C04B35/111—Fine ceramics
    • C04B35/117—Composites
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    • 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
    • C04B35/48—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 zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
    • C04B35/488—Composites
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • C04B35/6309—Aluminium phosphates
    • 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
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
    • C04B35/80—Fibres, filaments, whiskers, platelets, or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5216—Inorganic
    • C04B2235/522—Oxidic
    • C04B2235/5228—Silica and alumina, including aluminosilicates, e.g. mullite
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/526—Fibers characterised by the length of the fibers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5292—Flakes, platelets or plates
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient

Description

Foreliggende oppfinnelse vedrører et porøst sammensatt material inneholdende kjemisk bundne kjeramiske fibre. The present invention relates to a porous composite material containing chemically bonded ceramic fibers.

Forskjellige typer av ildfaste termisk isolerende materialerDifferent types of refractory thermal insulating materials

er allerede kjent og som motstår den termiske og kjemiske innvirkning av smeltet aluminium. Blant disse nevnes spesielt ildfaste materialer som utgjøres «Sv en ildfast sement-og kjerccroiske<0>fibre hvori fibrene og sementen er varmbundet, idet butongen da er delvis sintret. is already known and which resists the thermal and chemical impact of molten aluminium. Among these, refractory materials are mentioned in particular, which constitute "Sv a refractory cement and kerchroic<0>fibres in which the fibers and cement are heat-bonded, as the butong is then partially sintered.

En grundig undersøkelse av disse kjente ildfaste materialerA thorough examination of these known refractory materials

har gjort det mulig å iaktta at naturen av bestanddelene i den sement som anvendes i disse materialer kan ha en skadelig innvirkning på egenskapene for disse materialer når de kommer i kontakt med aktive smeltede metaller som for eksempel støpejern eller aluminium. has made it possible to observe that the nature of the constituents of the cement used in these materials can have a detrimental effect on the properties of these materials when they come into contact with active molten metals such as cast iron or aluminium.

Det er også kjent porøse ildfaste materialer som dannee-*av store komaggregater bundet av et bindemiddel som for eksempel <uW^tn&u>v\itføftø|ft£.^s& sintret ved høyt trykk. Ved siden av det forhold at disse materialer ikke kan støtes når de formes på grunn av at de oppnås under trykk, har de også den mangel at de for lett fuktes av det smeltede metall. Porous refractory materials are also known which are formed from large aggregates bound by a binder such as <uW^tn&u>v\itføftø|ft£.^s& sintered at high pressure. In addition to the fact that these materials cannot be bumped when they are formed due to the fact that they are obtained under pressure, they also have the disadvantage that they are too easily wetted by the molten metal.

Det er derfor foretatt eksperimenter for å danne ildfaste materialer som ikke har de mangler og ulemper som de ovenfor beskrevne materialer og som er basert på et brett område av aggregater og omfattende^ fibre med aluminiumoksydinnhold mellom 45 og 95%. Disse eksperimenter har ført til en ny klasse av porøse sammensatte materialer. Oppfinnelsen vedrører således et porøst sammensatt material som utgjøres av en blanding av kjeramiske fibre og et aggregat bundet av et metallfosfat og hvori aggregatet utgjør mellom 5o og 89% av den totale vekt av blandingen og hvori aggregatet er tatt fra gruppen som utgjøres av aluminiumoksyd, corund, Experiments have therefore been carried out to form refractory materials which do not have the shortcomings and disadvantages of the materials described above and which are based on a wide range of aggregates and comprehensive fibers with an alumina content between 45 and 95%. These experiments have led to a new class of porous composite materials. The invention thus relates to a porous composite material which consists of a mixture of ceramic fibers and an aggregate bound by a metal phosphate and in which the aggregate constitutes between 50 and 89% of the total weight of the mixture and in which the aggregate is taken from the group consisting of aluminum oxide, corundum ,

zircon og tabulært aluminiumoksyd.zircon and tabular alumina.

Det var derved mulig å tilveiebringe et brett område av materialer omfattende: - kjeramiske fibre som utgjør 9 til 5o vektprosent av den totale vekt av blandingen - et aggregat som utg"jør 5o til 95% av den totale vekt av blandingen - og et bindemiddel som utgjør 2 til lo vektprosent av den totale vekt av blandingen It was thereby possible to provide a wide range of materials comprising: - ceramic fibers which make up 9 to 50% by weight of the total weight of the mixture - an aggregate which makes up 50 to 95% of the total weight of the mixture - and a binder which constitutes 2 to 10 percent by weight of the total weight of the mixture

For å utgjøre det bindemiddel som utvikler en fosfatbinding,To constitute the binder that develops a phosphate bond,

var det mulig å anvende kommersielle bindemidler fremstilt spesielt av firmaene Zschimmer og Schwartz, Foseco og ICI, omfattende orto*-fosforsyre, aluminiumfosfater: eller aluminiumklorfosfat. Det var også mulig å erstatte det kommersielle bindemiddel med en 5o% aluminium monofosfatløsning* it was possible to use commercial binders produced in particular by the companies Zschimmer and Schwartz, Foseco and ICI, including ortho*-phosphoric acid, aluminum phosphates: or aluminum chlorophosphate. It was also possible to replace the commercial binder with a 5o% aluminum monophosphate solution*

De etterfølgende eksempler gis fér å illustrere oppfinnelsen,The following examples are given to illustrate the invention,

de anvendte materialer og den enkle fremstillingspr.osess.the materials used and the simple manufacturing process.

EKSEMPEL 1EXAMPLE 1

I en industriblander av planettypen ble 2.26o kg T6o tabulært aluminiumoksyd som passerer gjennom sikt nr. 17 blandet med o.54o kg aluminiumoksyd fiber "Fibral" fremstilt av firmaet S.E.P.R. Under blandingen brytes fiberen i stykker. En blanding av pulver og fiberbiter med lengde en millimeter oppnås på denne måte; In an industrial mixer of the planetary type, 2.26o kg of T6o tabular alumina passing through sieve No. 17 was mixed with o.54o kg of alumina fiber "Fibral" manufactured by the company S.E.P.R. During mixing, the fiber is broken into pieces. A mixture of powder and pieces of fiber with a length of one millimeter is obtained in this way;

a a

0.060kg av et pulver av et fosfatholdig bindemiddel fremstilt av Zschimmer og Schwartz med betegnelsen nr. KB 6ol3 innføres så 0.060kg of a powder of a phosphate-containing binder produced by Zschimmer and Schwartz with the designation No. KB 6ol3 is then introduced

og den tørre blanding av bestanddeler homogeniseres.and the dry mixture of ingredients is homogenized.

looo cc vann tilsettes deretter etterhvert. Det oppnås en pasta som kunne formes i en form festet på et vibrerende bord.Veggene i formen var på forhånd: grundig innsmurt med et konvensjonelt slipemiddel, for eksempel "Trennemulsion" fremstilt av Zschimmer og Schwartz. lOO cc of water is then added gradually. A paste was obtained which could be shaped into a mold fixed on a vibrating table. The walls of the mold were beforehand: thoroughly lubricated with a conventional abrasive, for example "Trennemulsion" produced by Zschimmer and Schwartz.

Materialet vibreres bare under den tid som er nødvendig til atThe material is only vibrated for the time necessary to

det kan nøyaktig anta støpeformens form, men det er ingen fare for å etterlate materialet på det vibrerende bord inntil adskillelse av bestanddelene foregår. it can accurately assume the shape of the mold, but there is no danger of leaving the material on the vibrating table until separation of the constituents takes place.

Produktet holdes i formen i to timer for herding. Etter tørking ved henstand i ovn ved opptil 2oo°C oppnås et støpt produkt med dets endelige form. Krymping når en meget lav verdi på mindre enn o.5%, dvs- for en bjelke som er lo cm lang vil lengdekrympingen være mindre enn millimeter. The product is kept in the mold for two hours for curing. After drying by resting in an oven at up to 2oo°C, a molded product with its final shape is obtained. Shrinkage reaches a very low value of less than o.5%, i.e. for a beam that is lo cm long, the lengthwise shrinkage will be less than millimetres.

For oppnåelse av fullstendig fjernelse av vannmolekyler inneholdtTo achieve the complete removal of water molecules contained

i porene og som kan være blitt tilbake innesperret på tross av ovnsbehandlingen ved 2oo°C kan det være fordelaktig å holde det støpte produkt i ovnen mens temperaturen gradvis heves til 8oo°C. in the pores and which may have become trapped again despite the oven treatment at 2oo°C, it may be advantageous to keep the cast product in the oven while the temperature is gradually raised to 8oo°C.

Produktet har da de følgende egenskaper:The product then has the following properties:

- densitet 1.7- density 1.7

- total porøsitet lik eller større enn 55%- total porosity equal to or greater than 55%

- Young's modul ss 3o.ooo kg/cm2- Young's modulus ss 3o.ooo kg/cm2

- trykkfasthet loo kg/cm2- compressive strength loo kg/cm2

- termiskelednings-evne målt ved 3oo<D>C = o.3 watt/meter pr. C/time. - thermal conductivity measured at 3oo<D>C = o.3 watt/meter per C/hour.

Det skal imidlertid forstås at sluttproduktet oppnås ved omgivelsenes temperatur ved kjemisk reaksjon, idet ovnsbehandliggen bare har However, it should be understood that the final product is obtained at ambient temperature by chemical reaction, as the oven treatment only has

den funksjon å fjerne de siste molekyler av vann.the function to remove the last molecules of water.

Motstanden overfor termiske sjokk for det oppnådde produkt er ytterst god. Dette produkt motstår uten ulemper eller ned-bryting (ikke engang delvis) gjentatte Neddykkinger i bad av smeltet aluminiumlegering eller av rent smeltet aluminium. The resistance to thermal shocks of the obtained product is extremely good. This product resists without disadvantage or degradation (not even partially) repeated immersions in baths of molten aluminum alloy or of pure molten aluminum.

EKSEMPEL 2EXAMPLE 2

En fremstilling som fører til et produkt med samme egenskaperA preparation that leads to a product with the same properties

ble gjennomført ved innblanding av aluminium monofosfat ved tørr-blanding av: was carried out by mixing in aluminum monophosphate by dry mixing of:

- 2.26o kg aluminiumoksydpulver som passerer sikt nr. 17- 2.26o kg of aluminum oxide powder passing sieve no. 17

- o.54o kg aluminiumoksydfibér av "Fibral<n>typen fremstilt av- o.54o kg aluminum oxide fiber of the "Fibral<n>type produced by

- o.54o kg av en løsning av 5o% aluminium monofosfat i en liter betong hvoretter vann ble innblandet. - o.54o kg of a solution of 5o% aluminum monophosphate in one liter of concrete after which water was mixed in.

I dette tilfelle må det støpte produkt holdes i formen under ovnsbehandlingen og tas først ut etter ovnsbehandlingen ved 2oo° C. In this case, the molded product must be kept in the form during the oven treatment and only removed after the oven treatment at 2oo° C.

Når det anvendes mejjfet sure bindemidler er det nødvendig i denWhen mejjfet acid binders are used it is necessary in it

tørre blandingen å innblande et mageasiuminnhold på mindre enn 2% av den totale vekt for å nøytralisere syreoverskuddet. Det endelige produkt £orblir uendret. dry the mixture to include a gastric acid content of less than 2% of the total weight to neutralize the excess acid. The final product remains unchanged.

Ved på nytt å referere til beskrivelsen av det første eksempel,Referring again to the description of the first example,

sees det at granulometrien av aggregatpulveret var spesifisert.it can be seen that the granulometry of the aggregate powder was specified.

V, W,

Forsøk viser imidlertid at bruken av et aggregatpulver som ikke er så fint ikke endrer kvaliteten av sluttproduktet i særlig grad. Experiments show, however, that the use of an aggregate powder that is not very fine does not change the quality of the final product to any great extent.

I de forsøk som er beskrevet ovenfor var det anvendte aggregatP aluminiumoksydpulver. Bruken av andre aggregater som for eksempel zirkon, ildfast aluminosilikatleifce, corund eller tabulært aluminiumoksyd har ført til resultater som er like tilfredsstillende. Oppfinnelsen vedrører således en hel gruppe av sammensatte materialer hvor aggregatene og fibrene er kjemisk bundet ved dannelse av>efc bindemiddel i form. av metallfOsfat på grunn av innvirkningen av et surt fosfat på aggregatene. In the experiments described above, the aggregate P used was aluminum oxide powder. The use of other aggregates such as zircon, refractory aluminosilicate glass, corundum or tabular aluminum oxide has led to results that are equally satisfactory. The invention thus relates to a whole group of composite materials where the aggregates and fibers are chemically bound by forming a binder in the form of. of metal phOsphate due to the action of an acid phosphate on the aggregates.

Denne gruppe av materialer er derfor helt forskjellig fra de sammensatte materialer hvor bindingen oppnås ved delvis sintrincp av sementen eller i tilfelle med kalsiumaluminat-baserte sementer ved varmreaksjon av kalk-CaO i sementen med den ildfaste fiber. Denne virkning ble oppnådd bare under den endelige oppvarmingsfase mens i det foreliggende tilfelle dannes den kjemiske binding i kulden. I det foreliggende tilfelle kan følgelig produktet be-handles i luften ved en mer eller mindre høy temperatur uten noen endring i tilstanden av sluttproduktet. This group of materials is therefore completely different from the composite materials where the bond is achieved by partial sintering of the cement or, in the case of calcium aluminate-based cements, by hot reaction of lime-CaO in the cement with the refractory fibre. This effect was achieved only during the final heating phase, while in the present case the chemical bond is formed in the cold. In the present case, the product can therefore be treated in the air at a more or less high temperature without any change in the state of the final product.

Det foreliggende material finner full anvendelse ved fremstilling av innretninger for håndtering, overføring, rensing og støping av smeltet aluminium og smeltet støpejern. Selvom de materialer som er beskrevet ovenfor synes å være de mest fordelaktige for oppfinnelsen i en spesiell teknisk situasjon, er det klart at forskjellige modifikasjoner kan gjøres i sammensetningen av aggregatene uten å gå utenfor oppfinnelsens ramme. The present material finds full use in the manufacture of devices for handling, transfer, cleaning and casting of molten aluminum and molten cast iron. Although the materials described above seem to be the most advantageous for the invention in a particular technical situation, it is clear that various modifications can be made in the composition of the aggregates without going outside the scope of the invention.

Claims (9)

1. Porøst sammensatt material, kar,ak teri sert ved. at det består av en blanding av kjeramiske fibre og aggregatebundet av et metallfosfat hvori aggregatet utgjør mellom 5o og & 9% av den totale blandingen og hvori aggregatet er tatt fra gruppen som utgjøres <0> av aluminiumoksyd, corund, zirkon og tabulært aluminiumoksyd.1. Porous composite material, kar,ak teri sert wood. that it consists of a mixture of ceramic fibers and aggregate bound by a metal phosphate in which the aggregate makes up between 50 and & 9% of the total mixture and in which the aggregate is taken from the group consisting <0> of aluminum oxide, corundum, zircon and tabular aluminum oxide. 2. Material som angitt i krav 1, karakterisert ved at det omfatter et bindemiddel som utvikler den kjemiske fosfatbinding og som har en vekt på mellom 2 og lo% av den totale vekt»2. Material as stated in claim 1, characterized in that it comprises a binder which develops the chemical phosphate bond and which has a weight of between 2 and 10% of the total weight" 3. Material som angitt i krav 2 eller 3, karakterisert ved at fibrene utgjør mellom 9 og 43% av den totale vekt og selv har et aluminiumoksydinnhold på mer enn & o%.3. Material as stated in claim 2 or 3, characterized in that the fibers make up between 9 and 43% of the total weight and themselves have an aluminum oxide content of more than & o%. 4. Material som angitt i krav 1 til 3, karakterisert ved at det h«r en termisk ledningskoeffisient på o«3: v/ att pr. meter/°C og time.4. Material as stated in claims 1 to 3, characterized in that it has a thermal conductivity coefficient of o«3: v/att per meters/°C and hour. 5. Material som angitt i krav 1 til 4, karakterisert ved at det har en porøsitet på minst 5o%.5. Material as stated in claims 1 to 4, characterized in that it has a porosity of at least 5o%. 6. Material som angitt i krav 1 til 5, karakterisert ved at det har en Young <*> s modul på 3o*ooo til loo.ooo kg/cm2.6. Material as stated in claims 1 to 5, characterized in that it has a Young<*>'s modulus of 3o*ooo to loo.ooo kg/cm2. 7. Material som angitt i krav 1 til 6, karakterisert ved at det har en trykkfasthet større enn \ å>o kg/cm2.7. Material as specified in requirements 1 to 6, characterized in that it has a compressive strength greater than \ å>o kg/cm2. 8. Fremgangsmåte for fremstilling av et pfcodukt fra det porøse sammensatte material som er angitt i krav 1 til 7, karakterisert ved ^øfcgende trinn: - tørrblanding av aggregatpulverne, aluminiumoksydfibrene og bindemiddelet med en sur kjemisk binding; - gradvis innføring av en mengde vann som er større enn 1/4 av vekten av de tørre produkter} - forming inntil det sammensatte material herder; - ovnsbehandling opptil minst 2oo°C8. Process for producing a product from the porous composite material specified in claims 1 to 7, characterized by the following step: - dry mixing of the aggregate powders, aluminum oxide fibers and the binder with an acidic chemical bond; - gradual introduction of an amount of water greater than 1/4 of the weight of the dry products} - shaping until the composite material hardens; - oven treatment up to at least 2oo°C 9. Fremgangsmåte som angitt i krav 8^ karakterisert ved at ovnsbehandlingen full-føres ved gradvis stigende temperatur opptil 8oo° C.9. Method as specified in claim 8, characterized in that the oven treatment is completed at a gradually rising temperature up to 8oo° C.
NO771482A 1976-04-30 1977-04-28 PORST COMPOSITIONAL MATERIAL AND PROCEDURE FOR ITS MANUFACTURE NO771482L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7612921A FR2349551A1 (en) 1976-04-30 1976-04-30 Porous refractory mouldings resistant to molten aluminium or iron - contain ceramic fibres and e.g. alumina, bonded by metal phosphate

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NO771482L true NO771482L (en) 1977-11-01

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JP (1) JPS531219A (en)
AU (1) AU2447877A (en)
CH (1) CH598150A5 (en)
DE (1) DE2718332A1 (en)
FR (1) FR2349551A1 (en)
IT (1) IT1075636B (en)
NO (1) NO771482L (en)
SE (1) SE7705009L (en)

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DE3105579C2 (en) * 1981-02-16 1982-11-25 Didier-Werke Ag, 6200 Wiesbaden Process for the production of granular, fire-resistant or refractory materials containing ceramic fibers, materials produced by the process and their use
DE3105533C2 (en) * 1981-02-16 1982-10-28 Didier-Werke Ag, 6200 Wiesbaden Dry matter for use as fiber injection molding compound
US4935178A (en) * 1986-06-24 1990-06-19 General Signal Corporation Method of making refractory fiber products
EP0417493A3 (en) * 1989-08-14 1991-04-03 Aluminum Company Of America Fiber reinforced composite having an aluminum phosphate bonded matrix
GB2269185A (en) * 1992-07-30 1994-02-02 Rolls Royce Plc Improvements in or relating to removal of contaminants from molten metal.
JP5707203B2 (en) * 2011-03-30 2015-04-22 日本碍子株式会社 Honeycomb structure

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CH598150A5 (en) 1978-04-28
DE2718332A1 (en) 1977-11-17
AU2447877A (en) 1978-10-26
SE7705009L (en) 1977-10-31
FR2349551A1 (en) 1977-11-25
JPS531219A (en) 1978-01-09
IT1075636B (en) 1985-04-22

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