GB2202541A - Method for manufacturing investment casting cores - Google Patents
Method for manufacturing investment casting cores Download PDFInfo
- Publication number
- GB2202541A GB2202541A GB08804151A GB8804151A GB2202541A GB 2202541 A GB2202541 A GB 2202541A GB 08804151 A GB08804151 A GB 08804151A GB 8804151 A GB8804151 A GB 8804151A GB 2202541 A GB2202541 A GB 2202541A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- binder
- sand
- firing
- molded
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000005495 investment casting Methods 0.000 title description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 36
- 239000004576 sand Substances 0.000 claims abstract description 23
- 238000010304 firing Methods 0.000 claims abstract description 22
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 24
- 238000000465 moulding Methods 0.000 claims description 21
- 239000000919 ceramic Substances 0.000 claims description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 239000012188 paraffin wax Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 4
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 4
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 4
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000005642 Oleic acid Substances 0.000 claims description 4
- CEGOLXSVJUTHNZ-UHFFFAOYSA-K aluminium tristearate Chemical compound [Al+3].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CEGOLXSVJUTHNZ-UHFFFAOYSA-K 0.000 claims description 4
- 229940063655 aluminum stearate Drugs 0.000 claims description 4
- 235000013871 bee wax Nutrition 0.000 claims description 4
- 239000012166 beeswax Substances 0.000 claims description 4
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 4
- 239000012184 mineral wax Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- 150000001875 compounds Chemical class 0.000 description 8
- 239000000843 powder Substances 0.000 description 6
- 239000004615 ingredient Substances 0.000 description 5
- 235000019809 paraffin wax Nutrition 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 235000019271 petrolatum Nutrition 0.000 description 5
- 239000001993 wax Substances 0.000 description 5
- 239000006087 Silane Coupling Agent Substances 0.000 description 4
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910021485 fumed silica Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- DSEKYWAQQVUQTP-XEWMWGOFSA-N (2r,4r,4as,6as,6as,6br,8ar,12ar,14as,14bs)-2-hydroxy-4,4a,6a,6b,8a,11,11,14a-octamethyl-2,4,5,6,6a,7,8,9,10,12,12a,13,14,14b-tetradecahydro-1h-picen-3-one Chemical compound C([C@H]1[C@]2(C)CC[C@@]34C)C(C)(C)CC[C@]1(C)CC[C@]2(C)[C@H]4CC[C@@]1(C)[C@H]3C[C@@H](O)C(=O)[C@@H]1C DSEKYWAQQVUQTP-XEWMWGOFSA-N 0.000 description 1
- 239000004610 Internal Lubricant Substances 0.000 description 1
- 229920001800 Shellac Polymers 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 235000013874 shellac Nutrition 0.000 description 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
- 229940113147 shellac Drugs 0.000 description 1
- 239000004208 shellac Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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
- C04B35/622—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
- C04B35/632—Organic 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
-
- 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
- B22C1/24—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 oily or fatty substances; of distillation residues therefrom
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
A core manufacturing process is disclosed which utilizes a low viscosity distillable binder and firing in a nonreactive refractory sand to provide debindering and sintering of the core in one operation. Cores produced utilizing the disclosed method offer significant savings in processing time while reducing the potential for breakage.
Description
Method for Manufacturing Investment
Casting Cores
Technical Field
This invention relates to ceramic cores utilized in the investment casting process and more particularly to a method for manufacturing ceramic cores utilizing single cycle core firing in refractory sand.
Background Art
Investment casting is extensively used in the production of nickel and cobalt base superalloy blades and vanes for gas turbine engines, narticularlv those requiring internal cooling passages, providing relatively precise dimensional tolerances and excellent surface finishes. In investment casting, a ceramic mold is formed around a wax pattern with a ceramic core or cores precisely positioned within the wax to simulate the required holes and passages. The wax is removed durinq a firing operation while the mold and cores remain in place, providing a mold cavity. Molten metal is added and solidified in the cavity and the ceramic cores chemically removed such as by leaching with a hot alkali solution.Utilizing removable ceramic cores avoids machining or drilling operations which may be difficult to perform on superalloy materials.
Ceramic cores are typically produced by first preparing a core molding comDosition comprising a ceramic material, such as amorphous silica, and a binder1 These materials, as well as any other components added to adjust properties, are blended, fluidized and injected into a mold, forming a core shape which is removed from the mold, placed in a furnace and heated to drive off the binder. In U.S.
Patent No. 3,234,308 to Herman, a core is disclosed which incorporates impregnation with a thermosetting resin, such as shellac, prior to debindering, to maintain the core shape after the binder is removed.
The core is subsequently fired to sinter the ceramic material, forming a solid core body while sinul tanecusly destroying the resin.
Many core manufacturers use closed ceramic setters which conform to the configuration of the core to accurately support the core and prevent the cores from warping during the firing process, with binder removal and core firing performed in two separate operations. Use of the setter technique with some binder formulations may require up to two weeks between debindering and sintering. Such a long period presents numerous opportunities for breaking or cracking the fragile core, while substantially increasing processing time. Consequently, what is needed in the art is a method of producing ceramic cores which reduces cracking and minimizes Drocessinq time.
Disclosure of Invention
It is an object of the present invention to provide a method for manufacturinq investment casting cores which utilizes a single firing cycle for debindering and sintering.
It is a further object of the present invention to provide a single cycle core production process which significantly reduces the time required to produce a core.
These and other objects of the present invention are achieved by utilizing a core production process which includes the steps of preparing a core molding composition, blending with a low viscosity, distillable binder, molding the mixture to a desired shape, embeddinq the molded shape in a nonreactive refractory sand, and firing the sand and molded core disposed therein at controlled temperatures wherein the binder is drawn by capillary action into the sand where it is evaporated or decomposed. The debindered core, fully supported in the sand, is then subjected to a higher temperature at which sintering occurs.
Brief Descriation of Drawings
The sole Fiqure is a graph illustrating a typical core firing program.
Best Mode for Carrying Out the Invention
A ceramic core production process comprises molding compound preparation, core molding, debinderlnq and sintering. Other processing steps may be included such as powder mixing, surface treatment of the ceramic powders, binder preparation, mixinq of the treated powder mixture with the binder, forminq the molding compound, and, pelletization of the molding compound for uniform feeding in an injection molding machine.
For exemplary purposes, a core molding compound may comprise up to 35 percent by weight zircon, up to 5 percent fumed silica, up to 6.5 percent alumina fiber, balance amorphous silica, with a binder added in an amount sufficient to maintain a molded shape before firing, and a silane coupling agent added in an amount sufficient to produce optimal surface wetting of the powder by the binder. Such ingredients are discussed in the applicants copending application titled "Core Moulding Composition", Attorney Docket No.
R-2683, filed on even date herewith and herebv incorporated by reference. While an exemplary composition, it will be understood by those skilled in the art that the ingredients and proportions of the composition can be varied to produce cores with different strength and shrinkage properties. For example, silica, alumina and zircon core compositions, and mixtures thereof, may successfully utilize the method of the present invention
The choice of binder formulation is usually dependent on the particular application and may comprise a mixture of paraffin waxes, lubricants and mold release agents. However, a low viscosity, distillable binder is required to practice the present inventive method.For the purposes of this application, low viscosity refers to the flowability of the binder at debinderinq temperatures and distillable refers to the ability of the binder to essentially vaporize or decompose at the debindering temperature. It should be noted that small auantities of the binder composition mav be non-distillable without deviating from this definition. For example, up to 20% of the binder mixture may remain in the core without sacrificing the benefits of the present invention. In addition, the binder chosen should exhibit a low viscosity at iniection conditions to increase moldability; about 10,000 centipoise is exemplary. One such low viscosity, distillable hinder comprises 33.38 paraffin wax havinq a meltinq point of 131-136çC, 33.3t paraffin wax havinq a meltinq point of 144-149 C and 33.34 mineral wax having a melting point of 163-1720C, with an admixture including aluminum stearate, oleic acid and beeswax added as internal lubricants, mold release agents and deflocculants.
After incorporating a low viscosity, distillable binder in the core molding composition, the bindered core composition is molded into a desired shape using either a plunger or screw-type molding machine and conventional molds. While either machine may be used, best results are generally obtained using one with electronic feedback process control of the inlection temperature, injection rate and injection pressure.
It will be understood by those skilled in the art that universal molding conditions are not obtainable and that the optimal molding conditions must be determned by trial, however, molding temperatures between 1800 and 2304F and pressures of about 4,000 to 10,000 psi are common.
The molded core is removed from the mold and placed in a firing sagger or box containing refractory sand. It is essential that the core be completely embedded in the sand for support and to assure maximum heat transfer. For exemplary purposes, alumina sand having a particle size of about 0.0017 inches is used.
However, those skilled in the art will recognize that any nonreactive refractory sand, capable of withstanding the firing temperature, may be used.
The firing sagger is placed in a furnace and a firing cycle initiated. The firing sagger is heated externally with heat transferred through the refractory sand into the core, with temperature gradients possibly forming therebetween. As the molded core is heated, the low viscosity distillable binder is drawn out of the molded core by capillary action into the adjacent sand. The binder then distills off or is decomposed, completing the debindering operation. At this point, the core is very fragile. However, since the sand is essentially fluid, it shifts as the core shrinks and maintains full surface support during the entire core firing cycle. The temperature is then increased until the sintering temperature is reached, at which point the temperature is held until the ceramic particles sinter, thereby producing a core.
Example
A six pound batch of core molding compound is prepared for the inlection molding of a core. The proportions of each ingredient are disclosed in Table
I.
Table I
Ingredient Concentration Weiqht Percent amorphous silica 62.64 zircon 2784 fumed silica 4.12 alumina fiber (5 micron 4.16 dia x 0.125 inches long) silane coupling agent 1.24
The silane coupling agent converts the essentially polar ceramic surface of the compound to a surface of nonpolar nature which is easily wetted by the binder. For illustrative purposes, the silane coupling agent is Union Carbide Awl 105. After blendinq, the moist powder mixture is dried for three hours at about 220cm.
The ceramic powder is then mixed with a low viscosity distillable binder in a vacuum blender. The wax binder mixture comprises 33.38 paraffin wax having a meltinq point of 131-l360C, 33.38 paraffin wax having a meltinq point of 144-1490C and 33.3% mineral wax, such as ceresin, having a meltinq point of 163-172 C. In addition, an admixture of beeswax (4 parts), aluminum stearate (12 parts) and oleic acid (8 parts) is added to optimize binder properties. About 13.58 by weight binder is added to the core composition. Mixing time is batch dependent and, for this example, is about three hours at a temperature of 2200F.The molding compound is then extruded and pelletized, preferably using a die face pelletizing technique, for optimum flowability during the subsequent molding process. The pelletized moldinq compound is stored in a low humidity chamber until required for use.
Ceramic cores are then molded using a conventional plunger-type injection molding machine and conventional molds. The cores are then removed from the molds and packed into alumina sand havinq a particle size of about 0.0017 inches which is contained in a firing sagger. The sagger is placed in a programmed electronically controlled furnace and subjected to a firing cycle during which the binder is first removed from the core at low temperature without disturbing the core shape, followed by sintering of the ceramic particles at higher temperatures.
Referring to the Fiqure, an exemplary debindering and sinterinq firing Drogram is illustrated, for use with the above described core composition. The sand and cores are first subjected to a 135 oF per hour temperature ramp, from ambient to 7500F. During the ramp, the binder is removed from the core by capillary action. As the binder is drawn out into the sand, it is evaporated and/or decomposed, thereby providing debindered cores supported in the alumina sand. Any remaining traces of the binder are burned out during the next ramp to the sintering temperature of about 22500F, which proceeds at 270 F per hour.
The cores are held at the sintering temperature for approximately 3 hours, during which time complete sintering occurs between the ceramic particles and solid core bodies are formed. The cores are then furnace cooled, for example, using a 5400F per hour ramp, and the cooled cores removed from the firing sagger and prepared for core finishing and wax pattern molding.
While the preferred embodiment of the present invention is described in relation to a core composition having particular quantities of ingredients, it will be understood by those skilled in the art that various changes in composition may be made to provide additional desirable properties without varying from the scope of the present invention. It will also be understood by those skilled in the art that while a particular debindering/sintering program is illustrated, other variations in times and temperatures may be used without varying from the scope of the present invention.
Having thus described the invention, what is claimed is:
Claims (5)
- Claims 1. A ceramic core production process which includes the steps of preparing a core molding composition; mixing with a binder; molding said mixture at controlled temperatures and pressures, to form a molded core; and, firing the molded core to effect binder removal and sintering; the imprOvements which comprise: mixing said composition with a low viscosity, distillable binder, embedding the molded core prior to firing in a nonreactive refractory sand, and, firing the refractory sand and the molded core contained therein at controlled temperatures such that the binder is drawn out of the core into said sand, said core being fully supportable by said sand, said sand and core being subsequently subjected to a sintering temperature, whereby a solid core body is formed.
- 2. The process of claim 1 wherein said binder comprises 33.3% by weight paraffin wax havinq a melting point of 131-136dC, 33.38 paraffin wax having a melting point of 144-1490C. 33.3% mineral wax having a melting point of 163-l?20C with an admixture of beeswax, aluminum stearate and oleic acid added in an amount sufficient to adjust the binder properties in the core.
- 3. The process of claim 2 wherein said admixture comprises about 4 parts beeswax, about 12 parts aluminum stearate and about 8 parts oleic acid.
- 4. The process of claim 1 wherein the firing of said molded core proceeds at a first increasing temperature ramp from ambient to about 7500F, at about 1350F per hour, followed by a second increasing temperature ramp of about 2700F per hour, up to the sintering temperature of about 2SS0 F, holding for about 3 hours at about 22500F and cooling said core at a first decreasing temperature ramp of about 540F per hour.
- 5. The process of claim 1 wherein said molded core is embedded in alumina sand.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US1811487A | 1987-02-24 | 1987-02-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8804151D0 GB8804151D0 (en) | 1988-03-23 |
| GB2202541A true GB2202541A (en) | 1988-09-28 |
Family
ID=21786319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08804151A Pending GB2202541A (en) | 1987-02-24 | 1988-02-23 | Method for manufacturing investment casting cores |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS63248775A (en) |
| FR (1) | FR2615766A1 (en) |
| GB (1) | GB2202541A (en) |
| IL (1) | IL85507A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0590186A1 (en) * | 1991-09-30 | 1994-04-06 | H. SEELMANN & Co GmbH | Investment casting core |
| US6808010B2 (en) | 2001-03-13 | 2004-10-26 | Howmet Research Corporation | Method for treating ceramic cores |
| US20100236688A1 (en) * | 2009-03-20 | 2010-09-23 | Scalzo Orlando | Process for joining powder injection molded parts |
| FR3033509A1 (en) * | 2015-03-11 | 2016-09-16 | Snecma | DELIANTING METHOD USING POSITIONING JIG |
| FR3062323A1 (en) * | 2017-01-30 | 2018-08-03 | Safran | PROCESS FOR PRODUCING A CERAMIC CORE |
| US10695826B2 (en) | 2017-07-17 | 2020-06-30 | Raytheon Technologies Corporation | Apparatus and method for investment casting core manufacture |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109678535A (en) * | 2019-01-03 | 2019-04-26 | 安徽应流久源核能新材料科技有限公司 | It is a kind of using powder as Water-soluble ceramic core of raw material and preparation method thereof |
| CN109807289B (en) * | 2019-03-20 | 2023-09-29 | 浙江宁巍机械科技有限公司 | Intelligent suspension shell manufacturing production line |
| CN115697908B (en) * | 2020-05-27 | 2024-06-11 | 松下知识产权经营株式会社 | Inorganic structure and method for producing same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3234308A (en) * | 1961-11-21 | 1966-02-08 | Corning Glass Works | Method of molding ceramic articles |
| US3330892A (en) * | 1964-07-24 | 1967-07-11 | Corning Glass Works | Molding comminuted nonplastic inorganic material |
| US3957715A (en) * | 1973-01-10 | 1976-05-18 | Howmet Corporation | Casting of high melting point metals and cores therefor |
| US4221748A (en) * | 1979-01-25 | 1980-09-09 | General Electric Company | Method for making porous, crushable core having a porous integral outer barrier layer having a density gradient therein |
-
1988
- 1988-02-23 GB GB08804151A patent/GB2202541A/en active Pending
- 1988-02-23 IL IL85507A patent/IL85507A/en unknown
- 1988-02-24 JP JP63041787A patent/JPS63248775A/en active Pending
- 1988-02-24 FR FR8802249A patent/FR2615766A1/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0590186A1 (en) * | 1991-09-30 | 1994-04-06 | H. SEELMANN & Co GmbH | Investment casting core |
| US6808010B2 (en) | 2001-03-13 | 2004-10-26 | Howmet Research Corporation | Method for treating ceramic cores |
| US20100236688A1 (en) * | 2009-03-20 | 2010-09-23 | Scalzo Orlando | Process for joining powder injection molded parts |
| US10226818B2 (en) * | 2009-03-20 | 2019-03-12 | Pratt & Whitney Canada Corp. | Process for joining powder injection molded parts |
| US11383299B2 (en) | 2009-03-20 | 2022-07-12 | Pratt & Whitney Canada Corp. | Process for joining powder injection molded parts |
| FR3033509A1 (en) * | 2015-03-11 | 2016-09-16 | Snecma | DELIANTING METHOD USING POSITIONING JIG |
| FR3062323A1 (en) * | 2017-01-30 | 2018-08-03 | Safran | PROCESS FOR PRODUCING A CERAMIC CORE |
| US10695826B2 (en) | 2017-07-17 | 2020-06-30 | Raytheon Technologies Corporation | Apparatus and method for investment casting core manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63248775A (en) | 1988-10-17 |
| IL85507A (en) | 1991-09-16 |
| IL85507A0 (en) | 1988-08-31 |
| GB8804151D0 (en) | 1988-03-23 |
| FR2615766A1 (en) | 1988-12-02 |
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