EP0112851A1 - Compose ceramique contenant de la zircone et son procede de production - Google Patents

Compose ceramique contenant de la zircone et son procede de production

Info

Publication number
EP0112851A1
EP0112851A1 EP19830901884 EP83901884A EP0112851A1 EP 0112851 A1 EP0112851 A1 EP 0112851A1 EP 19830901884 EP19830901884 EP 19830901884 EP 83901884 A EP83901884 A EP 83901884A EP 0112851 A1 EP0112851 A1 EP 0112851A1
Authority
EP
European Patent Office
Prior art keywords
zircon
zirconia
particle size
mean particle
particles
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.)
Withdrawn
Application number
EP19830901884
Other languages
German (de)
English (en)
Inventor
Ronald Charles Garvie
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.)
Commonwealth Scientific and Industrial Research Organization CSIRO
Original Assignee
Commonwealth Scientific and Industrial Research Organization CSIRO
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 Commonwealth Scientific and Industrial Research Organization CSIRO filed Critical Commonwealth Scientific and Industrial Research Organization CSIRO
Publication of EP0112851A1 publication Critical patent/EP0112851A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C04B35/48—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
    • C04B35/481—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 containing silicon, e.g. zircon

Definitions

  • This invention concerns ceramic materials. M particularly it concerns refractory ceramic materials w good thermal shock resistance. BACKGROUND ART
  • the present inventor has now found that superi thermal shock resistance properties can be acquired zircon-based ceramic materials if the ceramic materia contain zirconia particles of two different sizes, so th the ceramic material consists of a matrix of the zirc material within which zirconia particles of a first si and also zirconia particles of a second size are locate Furthermore, this improvement in thermal shock resistan properties by the inclusion of a bimodal size distributi of dispersed zirconia is exhibited for a wide range of t concentrations of the dispersed zirconia.
  • a ceram material having good thermal shock resistance properties characterised by a) a matrix of zircon; b) a dispersion, within the zircon matrix, of zirconia particles having a first mean particle size; and c). a dispersion, within the zircon matrix, of zirconia particles having a second mean particle size, said second mean particle size being greater than said first mean particle size.
  • the smaller zirconia particles comprise fr 2 to about 20 per cent by weight of the product materi and the larger zirconia particles comprise from 2 to abo 20 per cent by weight of the product material.
  • the matrix material may be zircon sand or dissociat zircon (DZ).
  • Dissociated zircon is usually made by droppi zircon sand through a plasma furnace to form spheres reactive silica in which crystals of zirconia are embedde When the material of the present invention is made (s below) the silica recombines with the zirconia during t firing step to form zircon.
  • zirconia particles a about 10 per cent by weight of the fine fraction (that i zirconia particles which have a mean particle size which less than 4 micrometres and preferably in the range fr 0.5 to about 2.0 micrometres) and about 10 per cent weight of the coarser zirconia fraction (zirconia particl which have a mean particle size in the range from 4 about 25 micrometres, and preferably about 13 micrometres
  • the present invention also encompasses the method manufacture of the new ceramic materials.
  • method of making the improved ceramic material defin above comprises the steps of a) milling a powder of the matrix zircon material; b) dispersing within the milled powder a predetermin proportion of zirconia particles which have a fir mean particle size;
  • step (e) dispersing within the milled powder a predetermi proportion of zirconia particles which have second mean particle size, said second parti size being greater than said first particle size
  • step (e) moulding the mixture formed by steps (b) and (c) a desired shape; and e) firing the moulded shape at a temperature in range from about 1400°C to about 1700°C.
  • the firing time for step (e) may be up to five hou but the preferred firing time is about 1 hour.
  • the milling step (a) is performed until mean particle size is less than about 2 micrometr
  • a wax binder or the like may be added to t mixture formed by steps (b) and (c) to facilitate t moulding step (d).
  • zirconia particles c are available commercially - for example, the MEL-S grade of zirconia powder produced and sold Magnesium Elektron Co.
  • the smaller zirconia particles c be made by separating the fine particles from commercial available zirconia powder or by milling a commercial available zirconia powder, preferably until the me particle diameter has been reduced to below 2.0 micrometr (this milling may be effected with the particles admix with the zircon particles, thus combining steps (a) a
  • Another of the alternative ways of producing a mixt of zircon and fine zirconia particles is by a solid st reaction between zircon and alumina.
  • Pure alumina powder added to the batch of zircon.
  • the alumina may be fin divided before its addition to the zircon or it may milled to a suitable state of sub-division together w the grains of zircon.
  • the firing step is effected, when the firing temperat exceeds about 1450 C, the following reaction takes place:
  • the sodium hydroxide soluti contains about 50 per cent by weight of NaOH and is used a temperature of 300 C, it will leach silica fr dissociated zircon to leave zirconia.
  • the leaching of DZ is thus performed until the zircon contains an excess zirconia in the range from 2 to about 20 per cent by weig (preferably about 10 per cent by weight).
  • This partial leached material is then milled until the average partic size is less than about 2 micrometres, to produce t preferred admixture of steps ⁇ a) and (b) . (Note that ho concentrated sodium hydroxide solution will not lea silica from zircon sand. )
  • a first batch of ceramic bars was made by the follow technique. 438 gm of dissociated zircon and 62 gm of "Li A" alumina were wet-milled with 750 ml of isopropyl alco and 4 kg of magnesia partially stabilised zirconia for hours. After drying the milled batch and separating powder from the grinding medium, 55.6 gm of MEL-S grade monoclinic zirconia particles were added to the separa powder, together with 24 zirconia grinding balls. T mixture was tumbled for half an hour, after which grinding balls were removed and 4 per cent by weight o binder was blended into the mixture.
  • the binder compri 80 per cent glycerol and 20 per cent of "Versikol K (Trade Mark).
  • Eight rectangular bars of the mixture e bar measuring 6 mm x 6 mm x 50 mm, were pressed in a d then isopressed at 207 MPa.
  • the pressed bars were t heated at the rate of 80 C per hour until a temperature 1600 C had been attained.
  • the bars were held at t temperature for one hour, then the furnace was switch off. When the bars had cooled to room temperature, th were ground until their cross-section was 3 mm x 3 mm.
  • a second batch of eight bars was prepared in the sa manner as the first batch except that the coarse zircon particle fraction was omitted.
  • a third batch of eight ba was prepared in the same way as the ' first batch, exce that no alumina (that is, no fine zirconia particle phas was included in the batch.
  • the bars of each of the second, third and fou batches were tested in the same way as the bars of first batch.
  • the zirconia phase composition and the measu properties of the bars of each of the batches are lis below:
  • Values of MOR. are greater than about 160 MPa. 2. Values of MOR (obtained after the thermal sh test described above) are at least 45 per cent the values of MOR.; (that is, values of MOR greater than about 72 MPa). 3. The bulk density is greater than 4.25 gm/cc.
  • the open porosity is less than about 5%.
  • the matrix phase consists either of pure zircon a mixture of pure zircon (major matrix phase) mullite (minor matrix phase), with the matrix ph being at least 70 per cent of the ceramic mater and having a mean grain size which is less than micrometres.
  • the mean particle size of the fine zirco particles is less than 3 micrometres and content of fine zirconia particles in the prod material is in the range from 2 to 20 per cent weight, with a preferred value of 10 per cent weight.
  • the mean particle size of the coarse zirco particle is in the range from 4 to 20 micrometre with a preferred mean size of about 13 micrometre the coarse fraction of zirconia particles being the range from 2 to 20 per cent by weight, with preferred value of 10 per cent by weight.
  • the material of the present invention may be used most areas where conventional ceramics and refractories a used. Some examples of suitable uses of the material are:
  • thermocouple protection tubes including tundish pouring nozzles and sliding gates for the continuous casting of steel); pump linings; pump components; die casting machine components; and nozzles for handling molten non-ferrous metals such a aluminium, aluminium alloys, zinc and zinc alloys.
  • the material of the present invention is especial suitable as a replacement for refractory grade partial stabilised zirconia materials, which are from three to t times more expensive than the materials of the present invention, and which have lower values of MOR. (from 21 49 MPa), and MOR (from 11 to 25 MPa) and an open porosi in the range from 15 to 22 per cent.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)

Abstract

Un matériau céramique possédant une bonne résistance aux chocs thermiques se compose d'une matrice de zircone à l'intérieur de laquelle se trouve une dispersion de particules de zircone possédant une distribution bimodale de tailles de particules. Les phases de zircone possèdent des tailles moyennes de particules (a) inférieures à 4 micromètres et (b) de 4 à 25 micromètres, chacune étant de 2 à 20 % (de préférence 10 %) en poids du matériau. Les particules de zircone sont mélangées à du zircone particulaire; le mélange est ensuite moulé et cuit au four à une température comprise entre 1400 et 1700oC. D'une manière alternative, les particules les plus fines du mélange peuvent être produites in situ par une réaction à l'état solide entre l'alumine et le zircone dissociés au moment de la cuisson au four.
EP19830901884 1982-06-18 1983-06-20 Compose ceramique contenant de la zircone et son procede de production Withdrawn EP0112851A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU448682 1982-06-18
AU4486/82 1982-06-18

Publications (1)

Publication Number Publication Date
EP0112851A1 true EP0112851A1 (fr) 1984-07-11

Family

ID=3694938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901884 Withdrawn EP0112851A1 (fr) 1982-06-18 1983-06-20 Compose ceramique contenant de la zircone et son procede de production

Country Status (2)

Country Link
EP (1) EP0112851A1 (fr)
WO (1) WO1984000030A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8613891D0 (en) * 1986-06-07 1986-08-06 Anderson Strathclyde Plc Sintered material
DE4042681C2 (de) * 1989-09-08 2002-01-03 Corhart Refractories Co Verfahren zur Herstellung von Zirkon enthaltenden feuerfesten Materialien mit verbesserter Wärmeschockfestigkeit
DE4091550C2 (de) * 1989-09-08 2002-01-10 Corhart Refractories Co Zirkon enthaltende feuerfeste Materialien mit verbesserter Wärmeschockfestigkeit
DE4120953A1 (de) * 1991-06-25 1992-01-16 Stieling Patric Dipl Ing Fh Verfahren zur herstellung technischer keramischer formteile nach dem giessverfahren
US7928029B2 (en) 2007-02-20 2011-04-19 Corning Incorporated Refractory ceramic composite and method of making
US7704905B2 (en) 2007-05-07 2010-04-27 Corning Incorporated Reduced strain refractory ceramic composite and method of making
FR2943055B1 (fr) 2009-03-10 2011-04-08 Saint Gobain Ct Recherches Poudre de zircone
DE102016210378A1 (de) * 2016-06-10 2017-12-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Zirkonoxid-keramik, zellularer werkstoff daraus und verfahren zur herstellung der zirkonoxid-keramik
CN108238785B (zh) * 2017-12-28 2021-07-13 凯龙蓝烽新材料科技有限公司 一种薄壁蜂窝陶瓷载体的制备方法
CN113896421B (zh) * 2021-10-14 2023-02-10 广东欧文莱陶瓷有限公司 一种耐磨数码陶瓷釉料

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH588426A5 (fr) * 1973-05-18 1977-05-31 Activite Atom Avance
SU629199A1 (ru) * 1977-05-23 1978-10-25 Ленинградский Ордена Трудового Красного Знамени Технологический Институт Имени Ленсовета Шихта дл изготовлени огнеупорных изделий
SU668925A1 (ru) * 1978-02-17 1979-06-25 Предприятие П/Я А-3944 Шихта дл изготовлени огнеупорных изделий
SU810647A1 (ru) * 1979-03-26 1981-03-07 Украинский Научно-Исследователь-Ский Институт Огнеупоров Шихта дл изготовлени огнеупор-НыХ издЕлий
JPS591232B2 (ja) * 1979-09-28 1984-01-11 住友アルミニウム製錬株式会社 ジルコニア焼結体の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8400030A1 *

Also Published As

Publication number Publication date
WO1984000030A1 (fr) 1984-01-05

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Inventor name: GARVIE, RONALD CHARLES