EP3986843A1 - Dispositif de dosage pour le prélèvement et la distribution d'une masse fondue et procédé de fabrication du dispositif de dosage - Google Patents

Dispositif de dosage pour le prélèvement et la distribution d'une masse fondue et procédé de fabrication du dispositif de dosage

Info

Publication number
EP3986843A1
EP3986843A1 EP20734866.5A EP20734866A EP3986843A1 EP 3986843 A1 EP3986843 A1 EP 3986843A1 EP 20734866 A EP20734866 A EP 20734866A EP 3986843 A1 EP3986843 A1 EP 3986843A1
Authority
EP
European Patent Office
Prior art keywords
oxide
melt
metering device
ceramic
fiber
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
EP20734866.5A
Other languages
German (de)
English (en)
Inventor
Philipp Kolbe
Thomas Wamser
Anna-Lena SPENLER
Michael KÄMMLER
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.)
Schunk Kohlenstofftechnik GmbH
Original Assignee
Schunk Kohlenstofftechnik 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 Schunk Kohlenstofftechnik GmbH filed Critical Schunk Kohlenstofftechnik GmbH
Publication of EP3986843A1 publication Critical patent/EP3986843A1/fr
Pending legal-status Critical Current

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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
    • C04B35/71—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
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    • C04B35/111—Fine ceramics
    • C04B35/117—Composites
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/02—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by volume
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/06—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by controlling the pressure above the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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Definitions

  • the invention relates to a metering device, preferably a metering crucible or container for vacuum-assisted metering, for withdrawing and dispensing a melt, preferably metal melt, in particular non-ferrous metal melt, in particular an aluminum melt or a melt containing aluminum.
  • the invention relates in particular to the field of processing molten metal, in particular molten non-ferrous metal, preferably aluminum melts, wherein the melt is sucked in by negative pressure and then e.g. is drained into a mold.
  • a mouthpiece of a so-called dosing crucible is usually dipped into a liquid aluminum melt, with an oxide layer having to be pierced if necessary.
  • Appropriate dosing crucibles can be made from a monolithic ceramic such as aluminum titanate. Typical wall thicknesses are between 10 and 25 mm.
  • the wall thickness and the high density of aluminum titanate have the disadvantage that the thermal shock resistance of the material is negatively affected.
  • the crucible also takes a long time to heat up for large component volumes. There is a risk of the melt solidifying due to the heat dissipation.
  • the disadvantage of the known dosing crucibles is also that only moderate mechanical parameters with flexural strengths well below 80 MPa are achieved and a brittle fracture behavior and the mentioned low thermal shock resistance can be observed. Immersing the crucible creates a large thermal gradient along the axis and along the wall thickness. The desired thermal shock resistance is not achieved due to the unfavorably low thermal conductivity of aluminum titanate (second thermal shock parameter).
  • the crucible material reacts with aggressive aluminum melts, which are processed, for example, in the refining or grain refinement or other alloy compositions, in particular alkali-containing melts that contain sodium or strontium additives.
  • aggressive aluminum melts which are processed, for example, in the refining or grain refinement or other alloy compositions, in particular alkali-containing melts that contain sodium or strontium additives.
  • the reactions that occur in the process lead to successive destruction of the metering device and, in the case of strong corrosive / chemical attack, also to contamination of the melt.
  • the aluminum titanate shows an unfavorable wetting behavior, so that adhesions of solidified aluminum up to the plunger sticking to the dosing crucible can be determined. In this case, dismantling must take place in the cold state, so that the resulting abrasion can lead to wear and tear and destruction of the dosing crucible and plunger.
  • the monolithic ceramic made of aluminum titanate is porous and riddled with cracks in order to improve the thermal shock behavior.
  • the crucibles are produced by slip casting of particle-laden slips.
  • the slip casting process has disadvantages in terms of component geometry or wall thickness. With the slip casting process, the wall thickness within the component cannot generally be varied. The maximum wall thickness is limited. The wall thickness is proportional to the root of the meal duration. During the casting process, gradients can form due to different particles. There are also disadvantages when sintering large-volume components. Furthermore, the shrinkage that occurs in large-volume components leads to considerable problems.
  • the present invention is based on the object of developing a metering device of the type mentioned at the outset in such a way that reproducible, rapid and precise metering of metal melts, in particular aluminum melts, without the formation of melt artifacts, contamination of the melt or air inclusions is possible, the metering device for a vacuum-assisted Casting method can be used and the metering device should be movable.
  • the invention essentially provides that the metering device consists of or contains an oxide-fiber-reinforced oxide-ceramic composite material with an open porosity, in particular from 20% to 40%.
  • the metering device consisting of the oxide-fiber-reinforced oxide-ceramic composite material can be coated or compacted on the surface.
  • Surface side means inside or outside or both inside and outside.
  • the oxide fiber-reinforced oxide-ceramic composite material is coated at least in some areas, in particular on the outside, to form a preferably closed-pore layer.
  • the coating material There is the option of using glass solder or organometallic compounds as the coating material.
  • the invention provides that a ceramic layer, a precursor-based layer or a glass-like layer is applied to the base body.
  • the layer is applied by thermal spraying.
  • the composite material contains oxide-ceramic fibers, preferably formed from at least one material from the group Al 2 O3, SiO 2 , ZrO 2 , Y 2 O 3 , TiO 2 , CaO, MgO, Y 2 O 3 stabilized ZrO2. Furthermore, it is provided that the composite material contains an oxide-ceramic matrix, preferably formed from at least one material from the group Al 2 O 3 , SiO 2 , ZrO 2 , Y 2 O 3 , TiO 2 , CaO, MgO, Y 2 O 3 stabilized ZrO 2 .
  • the matrix and the fibers consist of the same oxide-ceramic material or oxide-ceramic materials or contain this or these or that the main components of the matrix and the fibers match, for example consist of Al 2 O 3 .
  • the metal in the composite material and that of the melt or the main component of the melt should be the same.
  • the oxide-ceramic composite material By using the oxide-ceramic composite material, a non-brittle material is made available which has thermal shock resistance, sufficient mechanical strength and, regardless of the porosity, surprisingly the required vacuum tightness. There are no solidification processes or the formation of inhomogeneities. This increases the process reliability when processing the melt.
  • the metal of the oxide-ceramic composite material is aluminum, i.e. the fiber consists of Al 2 O 3 and the matrix also consists of Al 2 O 3 or essentially contains it.
  • the metal of the oxide-ceramic composite material is aluminum, i.e. the fiber consists of Al 2 O 3 and the matrix also consists of Al 2 O 3 or essentially contains it.
  • the same metals prevent contamination of the melt from the material of the metering device or the crucible or the container.
  • the use of the oxide-ceramic composite material results in a low component weight compared to the state of the art, so that the dosing process can be accelerated. There is also less wear and tear on the automatable displacement device or robot unit compared to the prior art, since smaller masses have to be moved.
  • the metering device itself can be produced from the oxide-ceramic fibers by winding fibers onto a tool that depicts the inner geometry of the metering device, or by using textile fabrics, braids, scrims. This results in particular advantages with regard to the geometry of the metering device, as a result of which structural improvements can be achieved.
  • the internal geometry is the same as the interior of the metering device into which the melt is sucked.
  • Ventilation options, attachment or integration of heating elements due to the thin wall thickness are possible.
  • the thin wall thickness also offers the advantage that only a small amount of heat is extracted from the melt, so that it is possible to work at a lower melting temperature than in the prior art. This brings energetic advantages. Structures required for handling the metering device can be designed without any problems. Easy assembly is possible due to the low weight. In spite of this, simple manufacture is possible.
  • DE 10 2013 104 416 A1 relates to monolithic ceramics with mesh reinforcement that are used in construction and for armor plates.
  • the ceramic can also be used for graphite reinforcement.
  • WO 2016/184776 A1 is a composite pipe that consists of two layers, one of which consists of non-porous monolithic oxide ceramic and one layer of oxide fiber composite ceramic.
  • a method for producing a component made of fiber-reinforced composite material can be found in DE 10 2010 055 221 A1.
  • Oxide-ceramic composite materials which have oxide-ceramic fiber reinforcements are known.
  • EP 2 848 509 A1 or DE 10 2016 007 652 A1 for example.
  • Turbine blades and turbine blades of superheated steam turbines are described in DE 102017202 221 A1 as an application example of a corresponding material.
  • Thin-walled dosing containers or crucibles can be produced from the porous oxide-fiber-reinforced oxide ceramic with additional components or add-on elements, the volumes being designed so that up to 50 kg of melt can be accommodated and transported without any problems.
  • the individual fiber filaments which are brought together in particular as fiber bundles or rovings with several hundred individual filaments, should have a diameter between 5 mm and 20 mm, in particular between 10 mm and 12 mm.
  • the density should preferably be between 2.0 g / cm 3 and 6.0 g / cm 3 , more preferably between 3.0 g / cm 3 and 4.0 g / cm 3 .
  • the open porosity i.e. the cavities of the metering device or its oxide-ceramic composite material, which are connected to each other and to the environment, are in the range between 20% and 40%, the range between 27% and 32% is preferred. Due to the open porosity, a low conductivity of the melting device of in particular less than 10 W / mK is achieved.
  • the wall thickness of the metering device should preferably be between 1 mm and 20 mm, more preferably between 1 mm and 4 mm.
  • the geometric design is arbitrary and can in particular be rotationally symmetrical.
  • the invention also includes that the metering device is designed as an insert for a metallic structure. This means that the metallic structure cannot be attacked by the melt, which could otherwise be destroyed.
  • the metering device can be manufactured using winding technology or based on textile fiber semi-finished products such as woven fabrics, braids, scrims.
  • the invention does not exclude that a coating is additionally provided.
  • Single-layer or multi-layer layers or coating systems preferably with thicknesses in the range between 50 mm and 2 mm, can be used as the coating in order to reduce the gas permeability.
  • the structure of the base body i.e. the oxide-ceramic composite material, should be retained as far as possible.
  • the composite material is basically infiltrated or modified only on the surface to a depth of 500 mm in order to enable good layer adhesion.
  • the porosity of the layer or layers should be significantly lower than that of the base material.
  • the layer or layers are closed-pore, preferably achieve at least a density of 97% of the theoretical density of the coating material.
  • Theoretical density is to be understood as that density at which a body made from the material has no pores.
  • the coating is intended to improve the gas tightness so that the metering device can be coated on the inside, that is to say on the melt side, or on the outside. A coating on the inside and outside is of course not excluded.
  • the coating material can preferably be identical to that of the base body, that is to say of the oxide-ceramic material.
  • the coating material can consist of crystalline and oxide-ceramic components.
  • the coating material should be temperature resistant up to 1200 ° C and corrosion and abrasion resistant.
  • the metering device can be coated on one or both sides, that is to say inside and outside. A coating can also be limited to certain areas.
  • Possible coating variants are e.g. the application of glass solder, precursor-based layers or thermal spraying.
  • a vitreous layer crystallizes on the substrate through a temperature treatment in the course of the layer production.
  • the coating particles are coated with a slip e.g. applied by brushing.
  • a slip e.g. applied by brushing.
  • liquid organometallic compounds can be used.
  • the application takes place wet-chemically, for example by spraying or dipping. These compounds pyrolyze, ceramize and crystallize through a temperature treatment.
  • the volume shrinkage during processing can be reduced by adding passive and active fillers. Passive fillers can be, for example, aluminum oxide, zirconium oxide. Active components in the layer would be A1, ZrSi 2 , T1B 2 . These oxidize in the course of the synthesis and there is an increase in volume.
  • thermal spraying the coating particles are melted with the aid of a torch, such as a plasma jet or an electric arc, and applied to the substrate by a gas stream. The melted particles hit the substrate, flatten and solidify. When they hit, there is a mechanical interlocking between the substrate and the particle. No further temperature treatment is necessary.
  • the coating material used for thermal spraying should be one that corresponds to the substrate material, i.e. the composite material, with regard to the main components. If a composite material made of Al 2 O 3 and ZrO 2 is used, the particles should also consist of Al 2 O 3 and ZrO 2 .
  • AI 2 O 3 fits e.g. YAG (Yttrium-Aluminum-Garnet) and Y2Si2O7 / YSiO 5 .
  • a layer system can be applied that forms one layer overall.
  • Layer systems are several individually differentiable layers of a layer.
  • An expansion mismatch can also be reduced by using graded layers.
  • the depth of penetration can be varied depending on the coating process.
  • penetration depth is also intended to express that there can be a transition area between the layer and the substrate. If organometallic precursors are used, they penetrate deeper into the substrate material and infiltrate it, with some reaction between the coating material and the substrate. During thermal spraying, the melted or partially melted particles hit the colder substrate surface, so that mechanical adhesion occurs. In this case, the depth of penetration is very small or only superficial adhesion can occur, so that practically no depth of penetration can be spoken of.
  • the coating has the advantage that embrittlement does not occur.
  • the coating increases the gas tightness.
  • the coating has a high hardness and offers abrasion and corrosion resistance.
  • the teaching according to the invention is characterized in that fiber reinforcements can be provided which are designed to be appropriate for the load.
  • thickenings can be provided in order to protect areas of increased stress.
  • a corresponding metering device is intended to process non-ferrous metal melts which consist of or contain Al, Si, Mg, Cu, Zn, Sn, Ti, Na, Sr, B, whereby aluminum melts or aluminum alloy melts should be mentioned in particular are.
  • the fiber reinforcement including the porous matrix leads to a significant increase in strength and damage tolerance compared to the monolithic ceramic that can be removed from the prior art. This leads to a quasi-ductile material behavior, which prevents brittle fracture and impacts or similar mechanical loads are classified as non-critical. For example, collisions when moving the dosing device, which can be caused by incorrect teaching of a robot, are less problematic.
  • the porosity of the composite material does not represent a technically relevant problem when the melt is sucked, held and metered by means of negative pressure. A high metering accuracy and exact quantity recording are possible. However, this does not exclude the possibility of an additional coating being provided.
  • the fibers and the matrix consist of the same oxide as Al 2 O 3 , this means that, for example, in the case of aluminum melts and its alloys, corrosion of the material of the metering device is prevented and an extremely favorable wetting ratio occurs. Additions of zirconium oxide, for example, can be advantageous.
  • the invention is therefore also characterized in that the weight proportion of the additive or the matrix component zirconium oxide, which is optionally reinforced with yttrium oxide, is 5% to 30%, in particular 12% to 25%, of the oxide ceramic of the matrix.
  • the favorable wetting behavior prevents e.g. the closure such as the plunger, e.g. can consist of SiC or an oxide ceramic material such as that of the metering device, baked firmly to the metering device.
  • Another advantage of the lightweight construction is the heat and temperature insulation properties, which enables new processing options by means of low temperature drops, i.e. temperature drops in the melt. Energy savings can be achieved.
  • the manufacturing technique gives freedom of geometric design. Any complex geometries with undercuts can be implemented.
  • the metering behavior can be improved by changing or adapting the geometry.
  • oxide-ceramic materials Due to the use of oxide-ceramic materials according to the invention, larger-volume crucibles can be produced in comparison with the prior art.
  • the small wall thickness enables the melt to be tempered by heating and cooling elements that surround the metering device.
  • the plunger is made hollow and thus sensors such as temperature sensors can be integrated in it.
  • the opening that is to say the mouthpiece of the metering device, can be designed in such a way that melt droplets cannot adhere.
  • the melt flow can be designed without interference if flow aids are formed inside the metering device, the negative shape of which is shown on the tool, on which the fiber bundles are wound or the flat fiber fabrics, scrims, braids are placed, which are previously impregnated with a slip containing oxide ceramic particles that form the matrix.
  • the invention is therefore also characterized by a method for producing a metering device, in particular a vacuum-assisted metering crucible or container, for withdrawing and discharging a melt, preferably metal melt, preferably non-ferrous metal melt, in particular an aluminum melt or a melt containing aluminum, comprising the process steps
  • Impregnation of an arrangement of oxide-ceramic fibers with a slip containing oxide-ceramic particles Impregnation of an arrangement of oxide-ceramic fibers with a slip containing oxide-ceramic particles
  • the arrangement is then removed from the tool, in particular removed from the mold or partially removed from the mold. Sintering then takes place. If necessary, the metering device produced in this way is reworked. In this case, one or more continuous fiber bundles or flat structures, in particular fiber scrims, fabrics or braids, are used as the arrangement.
  • the drying process for forming a green body from the arrangement is carried out in a temperature range between 40.degree. C. and 250.degree. C., in particular between 80.degree. C. and 150.degree.
  • sintering takes place, in particular at a temperature between 1000 ° C and 1300 ° C, preferably between 1150 ° C and 1250 ° C.
  • FIG. 1 shows a basic illustration of a metering device for removing and dispensing a melt with a separately drawn plunger
  • FIG. 2 shows a section of FIG. 1
  • FIGS. 2 and 3 shows a variant of the illustration in FIGS. 2 and
  • FIG. 4 shows a basic illustration of a winding process.
  • a metering device for removing and dispensing a melt, in particular a metal melt is shown, which is also referred to as a metering crucible or container 10 and is referred to in the following simply as a metering crucible.
  • the dosing crucible 10 has on the withdrawal or delivery side a mouth opening 14 which can be closed by a plunger 12 and which merges into a conical and then hollow-cylindrical section 16, 18.
  • the outer diameter of the plunger 12, specifically in its distal section 20, corresponds to the inner diameter of the mouthpiece or the mouth opening 14.
  • the dosing crucible 10 consists of a fiber-reinforced oxide-ceramic composite material made of the material or materials described above.
  • the porosity of the metering crucible 10 should in particular be between 27% and 32%.
  • the plunger 12 can be made of the same material as the dosing crucible 10 or, e.g. consist of silicon carbide,
  • the plunger 12 is made of an oxide-ceramic composite material, it can be hollow and e.g. Contain one or more sensors in order to control the process management and, if necessary, to control or regulate it.
  • the dosing crucible 10 is preferably produced using the winding technique, although prepregs, which can be placed on a tool that depicts the internal geometry of the dosing crucible 10, or a combination of these methods can also be used.
  • Fiber bundles, so-called rovings are wound onto the winding core, with the individual fiber filament diameters between 5 mm and 20 mm, in particular in the range between 10 mm and 12 mm.
  • the density should be in the range between 2 g / cm 3 to 6 g / cm 3, preferably between 2.5 g / cm 3 to 3.2 g / cm 3.
  • the slip contains the ceramic particles that form the matrix of the composite body.
  • the proportion of ceramic particles can be 10% by volume to 50% by volume, in particular 20% by volume to 40% by volume, based on the total volume of the slip.
  • a water-based slip is used with preferably organic additives e.g. Polyols, polyvinyl alcohols or polyvinylpyrrolidones, dispersion binders, preferably styrene acrylate dispersions.
  • organic additives e.g. Polyols, polyvinyl alcohols or polyvinylpyrrolidones, dispersion binders, preferably styrene acrylate dispersions.
  • the slip can be at least 10 wt% to 20 wt%, preferably at least 24 wt%, e.g. 21-35% by weight, based on the total weight of the ceramic particles, glycerine.
  • a material from the group Al 2 O 3 , SiO 2 , ZrO 2 , Y 2 O 3 , TiO 2 , CaO, MgO, and ZrO 2 stabilized with Y 2 O 3 are used as oxide ceramic both for the ceramic particles and for the fiber in question.
  • Al 2 O 3 should be used as material both for the matrix, ie consequently the ceramic particles, and for the fiber.
  • the slip can optionally contain additives such as ZrO 2 , the proportion being between 5% and 30%, in particular between 12% and 25% in% by weight, of the total powder amount of the ceramic metal oxide.
  • the proportion by volume of the ceramic particles should be 20 to 50% by volume based on the total volume of the slip.
  • the corresponding impregnated fiber bundles are then wound onto the winding core and then dried, in particular in the temperature range between 40 ° C and 250 ° C, preferably in the range between 80 ° C and 150 ° C.
  • a body produced in this way is cut through and pulled off the winding core.
  • This is followed by sintering in the temperature range between 1,000 ° C and 1,300 ° C, in particular between 1,150 ° C and 1,250 ° C. Possibly. post-processing takes place in order to then use the metering crucible 10 produced in this way.
  • the drying time depends on the temperature and is between 2 hours and 48 hours, preferably between 12 hours and 24 hours. Sintering takes place over a temperature / time curve with various holding stages and
  • the holding time at the maximum temperature should be between 5 minutes and 24 hours, preferably between 1 hour and 12 hours.
  • the geometry of the dosing crucible 10 can be changed to the desired extent as a function of the geometry of the winding core. This is illustrated in principle with reference to FIGS. 2 and 3. It is thus possible to vary the opening angle of the conical section 16 to the desired extent. In FIG. 2 the angle a1 is smaller than the angle a2 in FIG. 3. Furthermore, the length of the mouthpiece 14 can be varied, as a comparison of FIGS. 2 and 3 with regard to the sections S1, S2 makes clear. The length of the conical section 16 can also be varied (LI ⁇ L2).
  • Ribs can thus be formed, preferably those which run in a spiral. Wave structures can also be concentric around the longitudinal axis of the dosing crucible be provided to run in order to influence the flow behavior of the melt to the desired extent.
  • the fiber volume content of the metering device is 35% to 50%, preferably 32% to 42%.
  • Winding processes are used to produce rotationally symmetrical parts.
  • the internal geometry of the object is determined by the so-called winding core on which the fibers impregnated with the matrix are placed.
  • the winding is usually done with a winding machine that corresponds to that of a CNC lathe.
  • the winding core is clamped at one of its ends on a three-jaw chuck and at the other end e.g. stored on a tailstock.
  • fiber bundles which for example can comprise 100 or more individual fibers, so-called filaments, on the winding core
  • these are unwound from a bobbin holder.
  • the rovings can then pass deflection rollers, by means of which the tension of the rovings is adjusted via a resistor.
  • the fiber bundle is then passed through a thread eye over further deflection rollers through a slip bath, the composition of which has been described above. After the fibers have been impregnated, they are centered by a thread eye via one or more other pulleys, which also determine the spring tension and the number of revolutions, winding speed and length of the used fiber strand, and are placed on the winding core, which is rotating.
  • the thread tension is also of paramount importance. If this is too low, the fibers are not pressed onto the winding core to a sufficient extent. If the tension is too great, the slip cannot be sufficient get between the individual fiber filaments and the Ro vings can be torn off.
  • the wound fiber architecture is tied with tear-off fabric. This is used to create a uniform surface, compression by displacing excess slip and thus increasing the fiber volume content and also protects the component.
  • the rovings are laid in parallel, as can be seen from the present illustration in FIG. 4.
  • the rovings are deposited from one pole cap, that is from one end to the other pole cap, that is to the other end, in order to obtain fiber reinforcement in the x and y directions.
  • the winding angle is measured from the deposited fiber strand against the axis of rotation and influences the absorption of axial loads.
  • a winding part has purely unidirectional circumferential windings, d. H. the angle a is about 90 °, the highest tensile strengths can be achieved in tangential orientation. If the winding angle is ⁇ 45 °, more axial loads are absorbed. With reinforcement in the axial direction, i. H. small winding angles, the problem arises during production that it is no longer possible to fix the roving at the end of the body.
  • oxide-ceramic prepregs are produced.
  • fabric made of aluminum oxide fibers (> 99% Al 2 O 3 ) with an oxide ceramic particle is used impregnated with water-based slip.
  • the filament diameter is 10-12 mm and the yarn count is 20,000 denier.
  • the slip has a solids content of 30% by volume consisting of 80% by weight of Al 2 O 3 particles and 20% by weight of ZrO 2 particles.
  • the mean particle size is 1 mm.
  • 2% by weight of polyacrylic acid are added as a dispersant.
  • the tool covered with the prepreg is clamped in a winding device.
  • the aluminum oxide fiber rovings (> 99% Al 2 O 3 ) of yarn size 20,000 denier are guided from a bobbin holder over pulleys through an immersion bath and on the rotating one
  • the rovings are centered using a thread eye.
  • the thread tension is in the range from 10 to 90 N and is set using the pulleys.
  • the slip in the immersion bath has a solids content of 32% by volume of the ceramic particles based on the total volume of the slip, consisting of 80% Al 2 O 3 particles and 20% ZrO 2 particles.
  • the mean particle size is 1 mm.
  • the coiled fiber architecture of the molded composite material is consolidated by reducing the water content so that a green body is obtained. After drying, the wound fiber architecture can be removed from the core. Sintering then takes place at 1200 ° C. Rework can be done by turning, milling or grinding.

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

L'invention concerne un dispositif de dosage (10) destiné au prélèvement et à la distribution d'une masse fondue et constitué d'un matériau composite de céramique oxydée renforcé de fibres d'oxyde ou contenant celui-ci.
EP20734866.5A 2019-06-21 2020-06-18 Dispositif de dosage pour le prélèvement et la distribution d'une masse fondue et procédé de fabrication du dispositif de dosage Pending EP3986843A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019116844.9A DE102019116844A1 (de) 2019-06-21 2019-06-21 Einrichtung zur Entnahme und Abgabe einer Schmelze sowie Verfahren zum Herstellen der Einrichtung
PCT/EP2020/066928 WO2020254485A1 (fr) 2019-06-21 2020-06-18 Dispositif de dosage pour le prélèvement et la distribution d'une masse fondue et procédé de fabrication du dispositif de dosage

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EP3986843A1 true EP3986843A1 (fr) 2022-04-27

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US (1) US20220315494A1 (fr)
EP (1) EP3986843A1 (fr)
CN (1) CN114026055B (fr)
DE (1) DE102019116844A1 (fr)
MX (1) MX2021015299A (fr)
WO (1) WO2020254485A1 (fr)

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DE102022200652A1 (de) 2022-01-20 2023-07-20 Universität Stuttgart, Körperschaft Des Öffentlichen Rechts Mehrschichtverbundrohr, Verwendung des Mehrschichtverbundrohres und Verfahren zu dessen Herstellung
WO2024012682A1 (fr) 2022-07-14 2024-01-18 Schunk Kohlenstofftechnik Gmbh Matériau composite à base de fibre céramique d'oxyde et son procédé de production

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EP0126797A1 (fr) * 1983-05-31 1984-12-05 RUSS-Elektroofen Produktions- Gesellschaft mbH & Co. KG Dispositif pour soutirer des quantités mesurées de métal fondu
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US20220315494A1 (en) 2022-10-06
DE102019116844A1 (de) 2020-12-24
WO2020254485A1 (fr) 2020-12-24
MX2021015299A (es) 2022-01-18
CN114026055B (zh) 2023-08-01
CN114026055A (zh) 2022-02-08

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