EP0703773A1 - Piece moulee composite ceramique - Google Patents

Piece moulee composite ceramique

Info

Publication number
EP0703773A1
EP0703773A1 EP94917645A EP94917645A EP0703773A1 EP 0703773 A1 EP0703773 A1 EP 0703773A1 EP 94917645 A EP94917645 A EP 94917645A EP 94917645 A EP94917645 A EP 94917645A EP 0703773 A1 EP0703773 A1 EP 0703773A1
Authority
EP
European Patent Office
Prior art keywords
composite molding
ceramic composite
ceramic
particles
molding according
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.)
Ceased
Application number
EP94917645A
Other languages
German (de)
English (en)
Inventor
Stanislav Chladek
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.)
Schuetz-Dental GmbH
Original Assignee
Schuetz-Dental GmbH
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 Schuetz-Dental GmbH filed Critical Schuetz-Dental GmbH
Publication of EP0703773A1 publication Critical patent/EP0703773A1/fr
Ceased 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
    • C04B35/10—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
    • C04B35/119—Composites with zirconium oxide
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
    • C03C14/004—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of particles or flakes
    • 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
    • C04B35/64—Burning or sintering processes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/20—Methods or devices for soldering, casting, moulding or melting

Definitions

  • the invention relates to a ceramic composite molding according to the preamble of claim 1, its use in the dental field and a method for its production.
  • the machinability of the ceramic materials is a complex matter because of their hardness, brittleness, phase changes and high melting temperatures.
  • a particular manufacturing problem lies in the shrinkage of the ceramic.
  • 4,708,652 has disclosed a method for producing a ceramic composite molding for medical and dental implants, in which crystalline hydroxyapatite powder is sintered together with a special low-melting bioglass at 1100 ° C.
  • reaction sintering the fluorapatite is formed by chemical reaction.
  • pressure sintering is also described.
  • the disadvantage of this method is that only a low strength can be achieved with the selected substances and that a high proportion of over 40% of bioglass prevents the skeletal sintering of the apatite phase.
  • the problem of shrinkage is not dealt with in the document cited because the aim is only to produce raw parts in series where shrinkage does not play a significant role.
  • EP-A2 0 241 384 discloses a method for producing dental prostheses in which relatively large, crystalline ceramic particles are superficially bonded to a three-dimensional framework in a dry sintering process. This process has the disadvantage that the product obtained has a relatively low density because of the dry sintering (with only very little shrinkage). Without exception, the strength of the dental ceramics produced by the various known methods is not high enough to be able to produce larger or more complicated restorations.
  • the invention seeks to remedy this.
  • the invention has for its object to provide a ceramic composite molding and a method for its production, with which it is possible, preferably from a dispersion-reinforced high-performance ceramic in wet sintering technology complicated individual moldings, in particular for the dental field, with high dimensional precision and high to be able to provide mechanical strength.
  • the invention solves the stated problem with a ceramic composite molding, which has the features of claim 1, a use of the ceramic Ko posit molding, which has the features of claim 11, and a method for producing the ceramic composite molding, which has the features of claim 12.
  • the method according to the invention expediently takes place in a wax scalding mold and represents a combination of liquid phase sintering and shaping of the ceramic in a vacuum.
  • the pressure device required for this compensates for the shrinkage that occurs.
  • the advantages achieved by the invention are essentially the following: the initial compression of the starting mixture of crystalline ceramic particles and glass particles takes place automatically at elevated temperature through the capillary pressure of the pore channels of the ceramic mass;
  • FIG. 1 shows a cross section through an initial mixture of crystalline ceramic particles and glass particles.
  • FIG. 2 shows a cross section through the starting mixture according to FIG. 1 in the pre-compression phase
  • FIG. 3 shows a cross section through the starting mixture according to FIG. 1 in the wet sintering phase
  • FIG. 4 shows a cross section through the starting mixture according to FIG. 1 after wet sintering
  • the ceramic composite molded parts to be produced are first modeled in wax in their final form according to the known dental technique.
  • a spacer varnish is applied to the previously made plaster model in a layer thickness, which ensures sufficient space for the fastening material to be used in vivo when inserted.
  • the models are then attached to a special muffle former using wax pencils. In contrast to the usual muffle designs for metal casting, this muffle former has a longer cylindrical channel.
  • the wax crayons are chosen thicker than for metal casting.
  • An emulsion of hexagonal boron nitride (BN) is preferably applied to the attached wax models. Later, after the wax has been scalded out, it forms a protective, non-reactive intermediate layer on the inner walls of the mold, which also supports viscous flow of the ceramic mass and causes a smooth surface of the composite piece.
  • BN hexagonal boron nitride
  • a special investment material is then cast and the muffle is produced.
  • the investment must be fireproof and pressure-resistant up to approx. 1300 ° C and must not react with the materials intended for the mixture.
  • the wax is scalded out of the mold at temperatures up to a maximum of 800 ° C.
  • the cooled muffle (with a diameter of approx. 6 - 7 cm and a height of approx. 8 - 10 cm) is then filled with a powder mixture (consisting of crystalline ceramic particles and glass particles) to such an extent that the cylindrical channel (with a diameter of 1.5 - 2.0 cm and a height of approx. 3 - 5 cm) contains about half of the excess powder mixture.
  • a cylindrical piston is inserted into the channel.
  • the filled muffle is then placed in a program-controlled pressure furnace with a vacuum pump. Now the program control, which controls the vacuum pump, the heating and the pressure device of the device, is switched on. As the temperature rises, the crystalline ceramic particles automatically self-compress in a vacuum and then at higher temperatures, at the same time the crystalline ceramic particles are sintered wet and the mass is formed thanks to the existing glass phase through viscous flow. The pressure device presses the excess powder mixture into the mold during sintering and thereby compensates for the sintering shrinkage of the crystalline ceramic particles.
  • the starting powder mixture contains Al 2 0 3 powder (approx. 65% by weight) with dispersed Zr0 2 (approx. 15% by weight).
  • the Zr0 2 is stabilized with Y 2 0 3 (approx. 2% by weight) in order to prevent phase transformations.
  • the starting mixture contains the powder of a glass (approx. 18% by weight).
  • This powder is filled into the previously made muffle. Then the piston 15 is inserted into the channel and the muffle is brought into the furnace. The program control is switched on. The oven now begins to heat up. At the same time, the connected vacuum draws the air out of the muffle.
  • the Aufgenesis ⁇ speed to the working temperature of about 1, 300 ° C depends on the construction of the furnace, and typically varies between 30 minutes and several hours.
  • the glass particles liquefy - as shown in FIG. 2 - and wet the crystalline ceramic particles 1, which are still solid in this temperature range, as a liquid film.
  • the capillary pressure of the pore channels causes the powder mixture to contract, the particles to slide in the mold and thus to a quick pre-compression of the ceramic.
  • vacuum pores remain in the pre-compressed ceramic, so that later, during sintering, a viscous flow or sliding of the individual particles is possible.
  • the surface of the crystalline ceramic particles begins to glow. At approx.
  • the permanent liquid glass phase 2 remains enclosed in the pores between the sintered ceramic particles. It remains liquid during the entire manufacturing process and enables the viscous flow or sliding of the solid ceramic particles 1 under pressure.
  • the temperature is slowly lowered from about 1300 ° C. to room temperature, the liquefied part 3 of the surface of the sintered one Crystalline ceramic particles - as shown in Fig. 4 - solidified with simultaneous thermal contraction, forming rigid solid bridges 4.
  • the mass remains under the pressure of the excess powder pressed out of the cylindrical channel until the skeleton has completely solidified.
  • the muffle in the furnace is further cooled to room temperature.
  • the resulting thermal cooling contraction of the entire ceramic is compensated for by a corresponding, previously known total expansion of the investment.
  • the vacuum is now automatically released within the temperature interval of 900-20 ° C as soon as the entire ceramic is solid and the vacuum is no longer required.
  • the muffle is removed from the furnace and, as is customary with metal casting, devested.
  • the press channels are separated from the finished composite molding with a diamond cutting disc.
  • the bridge and crown frameworks produced in this way are coated with a suitable veneering compound for all-ceramic systems.
  • a suitable veneering compound for all-ceramic systems.
  • the furnace shown in FIG. 5 for carrying out the method according to the invention essentially consists of a working chamber 5 which is surrounded by a thermal insulation layer 6 and a furnace wall 7.
  • the working chamber 5 has a vacuum connection 8, a pressure device 9 and a heating device 10.
  • the muffle 11 described above with the shape 12 and the cylindrical channel 13 is filled with a powder mixture of crystalline ceramic powder 1 and glass particles 2.
  • the powder mixture 1, 2 can be pressed into the mold 12 from the cylindrical channel 13 by means of the fixed plunger 14 and the movable piston 15.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Composite Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Dental Prosthetics (AREA)
  • Dental Preparations (AREA)

Abstract

La pièce moulée composite céramique selon l'invention est constituée d'une matrice tridimensionnelle de particules céramiques cristallines (1) frittées par voie humide, les pores de cette matrice renfermant un verre (2) dont le point de ramollissement est inférieur à la température de frittage des particules céramiques cristallines (1).
EP94917645A 1993-06-08 1994-05-18 Piece moulee composite ceramique Ceased EP0703773A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH172093A CH686282A5 (de) 1993-06-08 1993-06-08 Keramisches Komposit-Formstueck.
CH1720/93 1993-06-08
PCT/EP1994/001605 WO1994028859A1 (fr) 1993-06-08 1994-05-18 Piece moulee composite ceramique

Publications (1)

Publication Number Publication Date
EP0703773A1 true EP0703773A1 (fr) 1996-04-03

Family

ID=4217029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94917645A Ceased EP0703773A1 (fr) 1993-06-08 1994-05-18 Piece moulee composite ceramique

Country Status (3)

Country Link
EP (1) EP0703773A1 (fr)
CH (1) CH686282A5 (fr)
WO (1) WO1994028859A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114536235A (zh) * 2022-01-20 2022-05-27 南京惠诚工具制造有限公司 钎焊超硬磨料工具烧结工艺
CN114773031A (zh) * 2022-04-29 2022-07-22 广东东唯新材料有限公司 一种陶瓷材料成型方法及陶瓷制品

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1105111A (en) * 1963-10-08 1968-03-06 Nat Res Dev Improvements in dental materials
JPS60186455A (ja) * 1984-03-06 1985-09-21 株式会社ニコン アパタイトコンポジツトセラミクス
EP0240643A1 (fr) * 1986-04-11 1987-10-14 Tyszblat Sadoun, Michèle Procédé de fabrication de prothèses dentaires
US4737411A (en) * 1986-11-25 1988-04-12 University Of Dayton Controlled pore size ceramics particularly for orthopaedic and dental applications
US5232878A (en) * 1989-06-30 1993-08-03 Hoya Corporation Process for producing inorganic biomaterial
FR2682297A1 (fr) * 1991-10-15 1993-04-16 Tyszblat Michele Prothese dentaire entierement ceramique a base de spinelle alumine/magnesie et son procede de fabrication.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9428859A1 *

Also Published As

Publication number Publication date
WO1994028859A1 (fr) 1994-12-22
CH686282A5 (de) 1996-02-29

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