EP3684525B1 - Verwendung einer giessaufschlämmung - Google Patents

Verwendung einer giessaufschlämmung

Info

Publication number
EP3684525B1
EP3684525B1 EP18786843.5A EP18786843A EP3684525B1 EP 3684525 B1 EP3684525 B1 EP 3684525B1 EP 18786843 A EP18786843 A EP 18786843A EP 3684525 B1 EP3684525 B1 EP 3684525B1
Authority
EP
European Patent Office
Prior art keywords
slip
surfactant
slurry
covering power
tiron
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.)
Active
Application number
EP18786843.5A
Other languages
English (en)
French (fr)
Other versions
EP3684525A1 (de
Inventor
Wen Zhang
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.)
Safran SA
Original Assignee
Safran SA
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 Safran SA filed Critical Safran SA
Priority to EP26150333.8A priority Critical patent/EP4699720A2/de
Publication of EP3684525A1 publication Critical patent/EP3684525A1/de
Application granted granted Critical
Publication of EP3684525B1 publication Critical patent/EP3684525B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/183—Sols, colloids or hydroxide gels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
    • B22C1/205—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of organic silicon or metal compounds, other organometallic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols

Definitions

  • This presentation concerns the field of foundry work, in particular lost-wax casting processes, and more specifically the slips used in such processes, especially for the manufacture of shell molds for foundry work.
  • lost-wax casting also known as lost-wax casting
  • lost-wax casting has been known since antiquity. It is particularly well-suited for producing metal parts with complex shapes. For example, lost-wax casting is used to produce turbomachine blades and bladed wheel sectors.
  • the first step is typically the creation of a shell mold. This usually involves making a pattern from a relatively low-melting-point material, such as wax or resin, around which a shell of refractory material is then created. After the pattern is destroyed—most often by removing the pattern material from inside the shell mold, hence the name—molten metal is poured into the mold to fill the cavity formed by the removed pattern. Once the metal has cooled and solidified, the mold can be opened or destroyed to recover a metal part conforming to the shape of the pattern.
  • a relatively low-melting-point material such as wax or resin
  • the wax model is generally dipped in a foundry slip, then coated with sand and dried. These operations can be repeated to form several layers and obtain the desired thickness and mechanical strength for the shell mold.
  • foundry slips are produced in large quantities for use over several months, but their properties degrade over time, impacting the quality of shell mold production.
  • One known method to mitigate this degradation involves regenerating the slip by diluting older slip with more recently produced slip, which partially restores its properties.
  • this method results in significant fluctuations in properties, its effects are short-lived, and a substantial portion of the older slip is discarded.
  • US 2006/081350 describes an improved method for removing shelled mussels.
  • CN 1 739 882 describes a powder used in high-temperature foundry work.
  • Sen Mei et al. “Optimization of parameters for aqueous tape-casting of cordierite-based glass ceramics by Taguchi method”, Materials Science and Engineering: A, vol. 334, no. 1-2, 06/13/2002, pages 11-18, ISSN: 0921-5093, DOI: 10.1016/S0921-5093(01)01773-7 , describes the optimization of parameters in a strip casting method for certain ceramics.
  • Beyhaghi Maryam et al. “Slip casting process for the manufacture of tubular alumina microfiltration membranes”, Materials Science-Poland, vol. 27, no. 2, 01/01/2009 , And US 4 812 428 describe slip casting processes.
  • the present presentation concerns the use of a foundry slip for the manufacture of shell molds according to claim 1.
  • a foundry slip is a slip suitable for forming a shell mold into which molten metal will be poured.
  • a slip contains a binder, that is, a compound that ensures cohesion between the powder particles and gives the shell mold its mechanical strength both in its raw state and after sintering.
  • the binder can be inorganic. Examples of binders will be given later.
  • the powder particles can be sand particles (also known as "flour"), especially refractory particles, generally having a diameter between 1 micrometer and 100 micrometers.
  • a surfactant also called a surface-active agent, is a compound that modifies the surface tension between two surfaces, for example, between two components of a mixture.
  • the inventor found that adding a particular surfactant to a foundry slip significantly stabilized the slip's covering power—that is, its ability, measured by mass per unit area, to remain on a given surface after quenching and draining.
  • the covering power of a prior art slip, without a covering power stabilizing surfactant tends to increase over time without stabilizing.
  • Some surfactants are known as dispersing agents to thin certain suspensions, but for these suspensions, they do not stabilize the covering power due to the absence of a binder. Conversely, in the slip described here, the covering power stabilizing surfactant modifies the interaction between the binder and the powder particles to stabilize the slip's covering power. Generally, compounds previously used as thinning or dispersing agents had no effect on covering power.
  • the surfactant also helps to stabilize the viscosity of the slip.
  • the slip according to this presentation has a composition with key parameters (viscosity, pH, density etc.), including covering power, which are stable over time, which makes it possible to improve the repeatability of the manufacturing process of shell molds and to considerably limit the amount of waste related to the traditional regeneration of slips.
  • key parameters viscosity, pH, density etc.
  • the surfactant has a carbon chain comprising at most 4,800 carbon atoms, preferably at most 2,000 carbon atoms, preferably at most 1,000 carbon atoms, preferably again at most 500 carbon atoms, preferably again at most 100 carbon atoms. This prevents the slip from thickening, as the binder molecules could become entangled in an excessively long carbon chain.
  • the surfactant does not contain ammonia ions. Since ammonia ions tend to cause the binder to gel, the use of such a surfactant further stabilizes the slip.
  • the surfactant leaves the pH of the slip unchanged to within ⁇ 5%.
  • the slip's pH is modified by less than ⁇ 5% before and after the surfactant is added. This ensures that the slip remains compatible with the other specifications of the shell mold manufacturing process.
  • the surfactant comprises Tiron C6H4Na2O8S2 .
  • the surfactant is Tiron.
  • Tiron in addition to satisfying the previous criteria , is a relatively common molecule, generally used as a complexometric indicator in chemistry. analytical, to reveal the presence of certain ions, or as a dispersant.
  • the surfactant includes sodium polyacrylate.
  • Sodium polyacrylate has the generic formula [-CH2-CH(COONa)-]n.
  • the surfactant is sodium polyacrylate.
  • the binder is chosen from: ethyl silicate, sodium silicate or colloids including, in particular, colloidal silica, colloidal alumina, colloidal yttria or colloidal zirconia.
  • the surfactant content by mass in the slip is less than 0.1%, preferably less than or equal to 0.05%.
  • a small amount of surfactant is therefore sufficient to stabilize the foundry slip, particularly its covering power.
  • too much of the surfactant used to stabilize covering power can cause excessive variations in covering power. Consequently, the overall composition of the slip remains unchanged. This ensures that the slip remains compatible with the other specifications of the shell mold manufacturing process.
  • the slip is a contact slip configured to come into contact with a wax or equivalent part model.
  • the first slip used which directly covers the model, is called the contact slip, as opposed to subsequent slips, called reinforcing slips, which cover the preceding layers of the forming shell mold.
  • a contact slip is configured to conform to the shape of the model and not alter it. A contact slip is often kept for longer periods than a reinforcing slip, which is consumed more quickly, hence the increased need for stability in a contact slip.
  • the powder particles comprise at least one compound among alumina, mullite, zircon, zirconia, silica, and mullite-zirconia composites.
  • Mullite refers to silico-aluminous materials.
  • the inventor studied a slip C, which was prepared by reusing slip A and by adding a surfactant to stabilize the covering power, in this case Tiron, at a mass concentration of 0.05%, preferably 0.005%.
  • the resulting foundry slip C is therefore also a contact slip.
  • the quantity of Tiron can be adjusted by a person skilled in the art according to the initial and target covering power, preferably without exceeding 0.1% by mass.
  • the mass concentration of Tiron can be less than or equal to 0.08%, preferably less than or equal to 0.05%, preferably less than or equal to 0.02%, and preferably even less than or equal to 0.01%.
  • Tiron has a short carbon chain, comprising fewer than one hundred carbon atoms, in this case, six. Tiron does not contain ammonia ions, as it contains no nitrogen at all. Tiron is also a good complexing agent for the chemical elements of the oxides present in slip C and originating from the powder particles; indeed, Tiron has an affinity for these oxides and can interact effectively with them. Moreover, Tiron will be eliminated during the heat treatment of the corresponding shell mold and will not have any detrimental effect on the metal of the casting that will be poured into the shell mold.
  • the surfactant which here is Tiron, ensures good stability of the slip C, in particular its covering power, as we will see with reference to the single figure.
  • This figure shows the evolution of the covering power (CP) of four slips as a function of time t.
  • Covering power can be measured in grams per square centimeter (g/ cm2 ) and time in days.
  • a wax model or an object with an equivalent surface finish and a predetermined shape is dipped for a first predetermined time, typically 10 seconds, into the slip, and then drained for a second predetermined time, typically 120 seconds.
  • the covering power is then calculated as the difference in mass of the model before and after dipping, divided by the surface area of the model. Covering power depends strongly on the composition of the model, the composition of the slip, and the times used in the calculation method; therefore, exact values have not been determined. shown in the single figure, only the comparative evolution being representative.
  • slips A and C described previously, whose evolution is represented respectively by curves A and C
  • slip B whose evolution is represented by curve B
  • slip D whose evolution is represented by curve D.
  • Slip B has an initial composition identical to slip A but differs from slip A in that it undergoes regeneration at time points R. Regeneration consists of removing a portion of slip B and diluting the remaining portion in freshly prepared slip.
  • the slip can be diluted in a proportion between 10 and 50%, for example, 20%. This operation is well-known.
  • Slip D has an initial composition identical to slip C, except for the mass proportion of Tiron which is 0.1%.
  • the four foundry slips A, B, C, and D were kept agitated throughout the measurements.
  • the covering power of the slips must remain between a lower limit (Min) and an upper limit (Max), illustrated in the single figure, to meet the desired technical specifications.
  • the range between the Min and Max limits can be approximately 5 to 10% of the target covering power.
  • slip C containing a surfactant as previously described, exhibits relatively stable coverage.
  • the small variations observed are due to measurement deviation and/or the addition of water to compensate for losses through gradual evaporation of the water contained in the colloidal silica.
  • Tiron nor any other agents were added during the tests after the initial addition of Tiron to slip C.
  • slip D comprising a covering power stabilizing surfactant in a quantity greater than or equal to 0.1% by mass, has a covering power lower than the minimum limit Min, therefore too low compared to the slip specifications.
  • Tiron also acted as a dispersing agent, thinning the slip and improving the tempering of the models during mold making. This allows for better slip coverage of enclosed or less accessible areas.
  • slip C containing a surfactant, specifically Tiron, exhibits a significantly increased lifespan thanks to the stabilization of its covering power.
  • Adding a surfactant to a foundry slip is inexpensive and easy to implement. Such a foundry slip therefore allows, at a lower cost, for better control of the manufacturing parameters of shell molds, reduced process costs, decreased industrial waste, and simplified slip use.
  • the slip could include another binder, chosen from: ethyl silicate, sodium silicate or colloids including, in particular, colloidal alumina, colloidal yttria or colloidal zirconia.
  • the slip could include other powder particles, chosen from alumina, mullite, silica, zircon, zirconia, all silico-aluminous based materials and their mixtures.
  • Foundry slip C is used to make a shell mold.
  • a pattern typically made of wax, can be dipped into slip C, then drained, sandblasted, and dried. These operations can then be repeated, preferably with another slip acting as a reinforcing slip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)

Claims (6)

  1. Verwendung, für die Herstellung einer Panzerform, eines Gießschlickers für die Herstellung von Panzerformen, umfassend Pulverpartikel, umfassend mindestens eine Verbindung aus Aluminiumoxid, Mullit, Zirkon, Zirkoniumdioxid, Mullit-Zirkoniumdioxid-Verbundstoffen, einem Material auf Basis von Siliciumdioxid und Gemischen davon, und ein Bindemittel, das ausgewählt ist aus Ethylsilikat, Natriumsilikat oder Kolloiden, insbesondere kolloidales Siliciumdioxid, kolloidales Aluminiumoxid, kolloidales Yttrin oder kolloidales Zirkoniumdioxid, der Gießschlicker umfassend Tiron C6H4Na2O8S2 und/oder Natriumpolyacrylat als deckkraftstabilisierendes Tensid, wobei der Massengehalt des genannten Tensids in dem Schlicker weniger als 0,1 % ist.
  2. Verwendung nach Anspruch 1, wobei das Tensid eine Kohlenstoffkette aufweist, umfassend höchstens viertausendachthundert Kohlenstoffatome.
  3. Verwendung nach Anspruch 1 oder 2, wobei das Tensid den pH des Schlickers auf 5 % genau unverändert lässt.
  4. Verwendung nach einem der Ansprüche 1 bis 3, wobei der Massengehalt des Tensids in dem Schlicker weniger als oder gleich wie 0,05 % ist.
  5. Verwendung nach einem der Ansprüche 1 bis 4, wobei der Massengehalt des Tensids in dem Schlicker weniger als oder gleich wie 0,01 % ist.
  6. Verwendung nach einem der Ansprüche 1 bis 5, wobei der Schlicker ein Kontaktschlicker ist, der konfiguriert ist, um mit einem Werkstückmodell in Kontakt zu kommen.
EP18786843.5A 2017-09-22 2018-09-21 Verwendung einer giessaufschlämmung Active EP3684525B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP26150333.8A EP4699720A2 (de) 2017-09-22 2018-09-21 Giessschlicker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1758793A FR3071423B1 (fr) 2017-09-22 2017-09-22 Barbotine de fonderie
PCT/FR2018/052318 WO2019058071A1 (fr) 2017-09-22 2018-09-21 Barbotine de fonderie

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP26150333.8A Division-Into EP4699720A2 (de) 2017-09-22 2018-09-21 Giessschlicker
EP26150333.8A Division EP4699720A2 (de) 2017-09-22 2018-09-21 Giessschlicker

Publications (2)

Publication Number Publication Date
EP3684525A1 EP3684525A1 (de) 2020-07-29
EP3684525B1 true EP3684525B1 (de) 2026-02-18

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EP26150333.8A Pending EP4699720A2 (de) 2017-09-22 2018-09-21 Giessschlicker

Family Applications After (1)

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EP26150333.8A Pending EP4699720A2 (de) 2017-09-22 2018-09-21 Giessschlicker

Country Status (7)

Country Link
US (1) US11833579B2 (de)
EP (2) EP3684525B1 (de)
CN (1) CN111148584B (de)
BR (1) BR112020005634B1 (de)
CA (1) CA3076445A1 (de)
FR (1) FR3071423B1 (de)
WO (1) WO2019058071A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4812428A (en) * 1986-08-12 1989-03-14 H. C. Spinks Clay Company Inc. Process for preparing a clay slurry

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SU407623A1 (ru) 1972-02-28 1973-12-10 Московский трижды ордена Ленина , ордена Трудового Красного Знамени автомобильный завод И. А. Лихачева СУСПЕНЗИЯ дл ИЗГОТОВЛЕНИЯ ОГНЕУПОРНЫХ ФОРМ в ПРОИЗВОДСТВЕ ЛИТЬЯ по ВЫПЛАВЛЯЕМЫМ МОДЕЛЯМ
SU1011323A1 (ru) 1979-07-11 1983-04-15 Харьковский Филиал Всесоюзного Научно-Исследовательского Института Литейного Машиностроения,Литейной Технологии И Автоматизации Литейного Производства Суспензи дл изготовлени оболочковых форм по выплавл емым модел м
SU1227310A1 (ru) 1983-04-12 1986-04-30 Московский ордена Ленина и ордена Трудового Красного Знамени химико-технологический институт им.Д.И.Менделеева Суспензи дл изготовлени многослойных оболочковых форм
SU1423249A1 (ru) 1985-10-10 1988-09-15 Московский автомобильный завод им.И.А.Лихачева Суспензи дл изготовлени оболочковых форм по выплавл емым модел м и способ ее приготовлени
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Non-Patent Citations (1)

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Title
BEYHAGHI MARYAM ET AL: "Slip casting process for the manufacture of tubular alumina microfiltration membranes", MATERIALS SCIENCE-POLAND, vol. 27, no. 2, 1 January 2009 (2009-01-01), XP055796311, Retrieved from the Internet <URL:https://materialsscience.pwr.edu.pl/bi/vol27no2/articles/ms_08_08fala_2008_219.pdf> *

Also Published As

Publication number Publication date
EP3684525A1 (de) 2020-07-29
WO2019058071A1 (fr) 2019-03-28
RU2020114216A3 (de) 2021-12-29
US11833579B2 (en) 2023-12-05
FR3071423A1 (fr) 2019-03-29
CA3076445A1 (fr) 2019-03-28
BR112020005634B1 (pt) 2024-03-12
CN111148584B (zh) 2022-10-28
FR3071423B1 (fr) 2019-10-18
EP4699720A2 (de) 2026-02-25
US20200282452A1 (en) 2020-09-10
BR112020005634A2 (pt) 2020-10-06
RU2020114216A (ru) 2021-10-22
CN111148584A (zh) 2020-05-12

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