US3422880A - Method of making investment shell molds for the high integrity precision casting of reactive and refractory metals - Google Patents

Method of making investment shell molds for the high integrity precision casting of reactive and refractory metals Download PDF

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Publication number
US3422880A
US3422880A US589022A US3422880DA US3422880A US 3422880 A US3422880 A US 3422880A US 589022 A US589022 A US 589022A US 3422880D A US3422880D A US 3422880DA US 3422880 A US3422880 A US 3422880A
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mold
tungsten
molds
dip
casting
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Robert A Brown
Clifford A Brown
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Selmet Inc
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Rem Metals Corp
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    • 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
    • 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
    • B22C1/165—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 in the manufacture of multilayered shell 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
    • B22C1/18—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • 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

Definitions

  • metal casting molds Although there are many types of metal casting molds, none of them is applicable to the high integrity precision casting of such metals as chromium, hafnium, molybdenum, plutonium, niobium, rhenium, thorium, uranium, tantalum, titanium, vanadium, zirconium, and the rare earth metals, all of which are highly reactive chemically in the molten state and have melting ranges above 2350 F.
  • FIG. 1 is a flow plan illustrating the basic investment shell molding process, a modification of which is the subject matter of the present invention.
  • FIG. 2 is a transverse sectional view through a of the class prepared by the instant invention.
  • the sequence of operations employed in the manufacture of intricate castings by the investment shell casting technique involves first providing disposable patterns made from waxes, plastics, frozen mercury, or other materials which readily may be removed from the mold.
  • the investment cycle consists of making the patterns by injecting the pattern material into a die, and gating the patterns to a central sprue to form a pattern cluster.
  • the pattern cluster then is dipped into an agitated slurry of the molding material, drained, stuccoed while still wet with particulate mold material in a fluidized bed or by sprinkling, and dried to a solvent content of less than 20% by volume.
  • the disposable pattern is removed by methods such as melting or solvent treatment.
  • the mold is cured by being fired at a temperature sufficiently elevated to remove volatiles and provide adequate bonding.
  • the molds then are heated, and filled with molten metal by gravity, pressure, vacuum, or centrifugal force. After cooling, the castings are removed from the sprue and finished in the usual manner.
  • the investment shell molds of the present invention comprise a facing portion including a major proportion, at least 50% by weight, of finely divided particles of metallic columbium, molybdenum, tantalum or tungsten, all bonded together with a suitable refractory metallic oxide binder, and a back-up reinforcing portion comprising finely divided particles of shell mold back-up material including ceramic mold materials and refractory metal oxide binders, all the mold components being integrally bonded together to form a strong structure having an inner face portion comprised predominantly of one of the indicated metals.
  • the method of making the herein described investment shell molds for the high integrity precision casting of reactive and refractory metals comprises dip-coating a disposable pattern in a liquid suspension of columbium, molybdenum, tantalum and/or tungsten and a binder therefor comprising a refractory metal oxide and/or a refractory metal compound pyrolyzable to a refractory metal oxide.
  • the dip coated pattern is stuccoed with at least one of the same finely divided metals, after which it is dried.
  • the foregoing sequence of dip coating, stuccoing and drying is repeated until a shell mold of the desired thickness has been built up about the disposable pattern.
  • the pattern then is removed from the mold, after which the mold is fired at a temperature which is below the sintering temperature of any of its constituents.
  • the firing temperature is predetermined to convert the content of any refractory metal compounds which may be present to refractory metal oxides and also, through the agency of the refractory metal oxides present initially or thus generated, to bond together the finely divided metal particles and mold back-up material particles to form the finished mold.
  • the herein described investment shell mold is made by repeatedly dip coating, stuccoing and drying a disposable pattern, indicated symbolically at 10 in FIG. 2, to invest the pattern with mold-forming coatings sufficient in number to build up a finished mold of the desired strength.
  • the coatings thus supplied are in general of three categories and are so illustrated in FIG. 2.
  • the first coatings are termed herein the facing coatings and comprise the dip coating and stucco coating 12, 14 making up the inner face of the mold, in direct contact with the molten metal poured therein.
  • a single dip coatstucco coat combination normally comprises the face coatmg.
  • the second category of coatings termed herein the adjacent facing coatings, comprise alternate dip coats and stucco coats applied in sequence on top of the face coat. There may be any desired or necessary numbers of such coats, indicated by n in FIG. 2.
  • the third class of coatings applied in making the herein described molds are those which during the use of the molds do not come in direct contact with the molten casting metal or with the vapor produced therefrom. These are termed herein back-up coatings and comprise alternate dip coats and stucco coats 20, 22 respectively applied in a sufficient number, n of FIG. 2, to lend the required strength to the mold. Thus there may normally be a total of from 4 to 12 or more adjacent facing and back-up coatings applied to the pattern in building up the mold, the total number being indicated at N in FIG. 2.
  • Each of these coatings has a characteristic composition as required to fulfill the general purpose of the invention, i.e. the provision of an investment shell mold for the high integrity precision casting of reactive and refractory metals.
  • the preferred components of the integral facing, adjacent facing and back-up coating systems may be selected from the following:
  • columbium, molybdenum, tantalum and tungsten which are the primary constituents of the foregoing systems, is directly responsible for the production of precision castings in the molds because of their very high melting points, their very low vapor pressures, their lack of a normal tendency to form casting-damaging intermetallic compounds with the various reactive and refractory casting metals, and their freedom from a tendency to react with the reactive and refractory metals to form gases which might contaminate the castings.
  • the foregoing metals may be used in the form of the pure metals, their alloys or their unalloyed mixtures.
  • they are employed in finely divided, graded condition having a particle size, for example, in the range of from below 400 mesh to 5 mesh U.S. Sieve Series, i.e. having a particle size of from 0.1 to 4000 microns.
  • zirconia, thoria, hafnia, yttria, and gadolinia may be used along with the columbium, molybdenum, tantalum or tungsten as mold materials in the face coating systems, as long as these oxide mold materials are not used in a quantity sufiicient to exceed 25 weight percent of the facing portion.
  • Their use as additives is desirable in some instances to reduce the cost of molds, to alter the thermal conductivity of the molds and to adjust the expansion characteristics thereof. In addition, in some instances they are beneficial in reducing or eliminating cold shut and/ or misrun defects.
  • the binders for the foregoing facing and integral facing coatings in general comprise the refractory metal oxide binders, or the refractory metal oxide-forming binders used in the liquid state, in the dissolved condition, or as solids suspended or dispersed in aqueous or other liquid media.
  • those metal oxide binders are preferred which have a free energy of formation at 1000" K greater than 69 kilocalories per gram atom of oxygen in the oxide, which bond upon pyrollization, and which will provide a high temperature bond for the columbium, molybdenum, tantalum or tungsten mold material container in the integral facing and adjacent facing systems.
  • Preferred binders of this class are the oxides, or compounds which form oxides, of zirconium, thorium, hafnium, yttrium or gadolinium.
  • metallicorganic compounds particularly the polymeric carboxylates such as diacetato zirconic acid (zirconium acetate), the alkoxides, the alkoxide alcoholates, the oxide alkoxide alcoholates, the polymeric alkoxides, the oxide alkoxides, hydrolyzed alkoxides, halogenated alkoxides, and hydrolyzed halogenated alkoxides of zirconium, thorium, hafnium, yttrium, and gadolinium.
  • the foregoing are converted to metal oxide binders which mature and cure below the sintering temperature of the metal component of the facing and adjacent facing systems, and thus normally ideally serve the purposes of the invention.
  • binders, and slurry suspension or dispersion media of the foregoing dip coat systems there may be employed in suitable quantity conventional additives such as suspension agents, green strength promoters, plasticizers, wetting agents, antifoaming agents, deflocculants and coating driers.
  • dipcoat components employed in the facing, adjacent facing and back-up coatings are applied in the form of aqueous or organic solvent slurries having, for best results the following viscosities:
  • D ipcoat slurry No. Preferred General range The pattern first is treated with a suitable solvent as required to remove any die release agent which may be on its surface. It then is immersed in the agitated first dip coat slurry and rotated to insure complete coverage. After a dwell period of from 10 to 60 seconds it is withdrawn and drained for 15-60 seconds.
  • the wet pattern assembly then is stuccoed with the finely divided metal, for example, +200 mesh columbium, molybdenum, tantalum and/ or tungsten grain.
  • the dip coated and stuccoed pattern assembly then is air dried until the coating is below, for example, a 20% by volume solvent content.
  • the dried assembly then is immersed in the agitated second dip coat slurry for 10-60 seconds, drained for 15-60 seconds, stuccoed with -100 +200 mesh metallic columbium, molybdenum, tantalum, or tungsten grain, and air dried to a solvent content below about 20% by volume.
  • This assembly then is treated with the third and subsequent dip coat slurries, drained, stuccoed and dried in similar manner until a mold of the desired thickness has been built up.
  • the previous coating should dry to a solvent content of from 2 to 20% by volume before the subsequent coating is applied in order to prevent the previous coating from dissolving in the subsequent dip coating slurry. This may require from 30 minutes to 6 hours drying time, depending on atmospheric temperature and humidity and pattern complexity. Vacuum drying may be employed to accelerate the drying procedure if desired, in particular instances.
  • each coating be dried below a 20% by volume solvent content before the subsequent coating is applied, for the reason specified above, it also is desirable that the drying be discontinued before the solvent content goes below a level of about 2% by volume. This results in the production of a resilient coating which expands and contacts with thermal changes and avoids significant cracking or spalling. If the solvent content falls below 2% the coating may become brittle and crack.
  • the first dip coat slurry may contain only mold material which is minus 325 mesh while the th dip coat slurry may contain appreciable amounts of 100 +200 mesh and --20 +50 mesh mold materials.
  • This particle size increase toward the outer coating is also reflected in the stuccoing material, which may be --l00 +200 mesh for the first two coatings and 20 +50 mesh for the remaining coatings.
  • the increase in mold material and stucco material particle sizes from the mold face to the outer coatings of the mold produces a very stable investment shell mold capable of producing very smooth surfaced castings, yet permits the venting of any generated gases during casting. It also reduces the possibility of the formation of hot tears in the casting due to the excellent collapsibility of the mold.
  • the assembly is heated to fiuidize and remove the disposable pattern from the shell mold with which the pattern has been invested.
  • the resulting mold then must be cured.
  • the molds first are dried in either air or in non-oxidizing atmospheres at from ISO-650 F. for an additional 1 to 6 hours, and then at 250-650 F. for l-6 hours. After the drying cycle, the molds are placed in a furnace provided with a non-oxidizing atmosphere of a selected gas which is non-reactive toward the metal present in the face coating or adjacent face coating of the molds. Such gases are, for example, hydrogen, the inert gases, and dissociated ammonia. A vacuum furnace also may be used. The molds are heated in the furnace to a predetermined peak temperature of from l500 to 5000 F. at a rate of 50-200" F. per hour. They are maintained at peak temperature for from 1-12 hours.
  • the molds should be heated during the curing cycle to a temperature which is from 60-75% of the temperature at which the metal to be case will melt. This converts the metal oxide-forming binder to a metal oxide binder and removes the final vestiges of volatiles from the molds, and provides the molds with a high temperature bond without destroying or distorting the mold.
  • a high temperature binder i.e. a refractory metallic oxide binder
  • the purpose of using a high temperature binder, i.e. a refractory metallic oxide binder, in the molds of the invention is to bond the mold material without the necessity of sintering it, thereby preserving the precise dimensions of the mold.
  • the mold then is cooled and filled with the molten casting metal by the usual techniques.
  • the casting metal is poured, allowed to solidify and cool, the mold removed, and the resulting casting finished in the usual manner.
  • refractory and reactive metals economically may be precision cast in the foregoing manner.
  • Such metals include chromium, columbium, hafnium, molybdenum, plutonium, tantalum, thorium, titanium, uranium, vanadium, zirconium, the platinum group metals, the rare earth group metals and yttrium.
  • the face coating of the mold material comprises an appropriate facing metal. Illustrative are the following:
  • Casting metal Mold material Chromium Molybdenum or tungsten. Columbium Tungsten or tantalum.
  • Molybdenum Tungsten or tantalum is Molybdenum Tungsten or tantalum.
  • Titanium Columbium, tantalum or tungsten Titanium Columbium, tantalum or tungsten.
  • Uranium Tantalum, or tungsten Uranium Tantalum, or tungsten.
  • Casting metal Mold material Vanadium Columbium, molybdenum, or
  • tungsten Zirconium Columbium or tungsten.
  • EXAMPLE 1 This example illustrates a tungsten integrally faced investment shell mold, bonded with zirconium dioxide and backed up with tungsten bonded with zirconium dioxide.
  • dip coat slurry formulations were as follows:
  • DIPCOAT SLURRY FORMULATION WEIGHT PERCENT
  • a disposable pattern assembly was dipped into the numbered dip coat slurry and alternately stuccoed with graded tungsten having a particle size of from minus to plus 200 mesh for the first two coatings and from minus 20 to plus 50 mesh for the remaining coatings.
  • the mold then was dried at 250 F for 6 hours and cured at 2300 F. for 3 hours. After cooling it was ready for use.
  • EXAMPLE 2 This example illustrates a molybdenum integrally faced investment shell mold bonded with zirconium dioxide and backed up with molybdenum and tungsten bonded with zirconium dioxide.
  • compositions of the dip coats were as follows:
  • DIPCOAT SLURRY FORMULATION WEIGHT PERCENT
  • the mold was prepared in the manner described above, alternately dipping the pattern in the dip coats and stuccoing with finely divided molybdenum with or without the addition of finely divided tungsten in the various dip coats.
  • the pattern was removed.
  • the resulting shell mold was dried at 250400 F. for 3 hours and then cured by heating in a hydrogen atmosphere at the rate of 300 per hour increase up to 2300 F. at which temperature it was held for 2 hours. It then was cooled, whereupon it was ready for use.
  • EXAMPLE 3 This example illustrates a columbium (niobium) integrally faced investment shell mold bonded with zirconium dioxide, and backed up with columbium, molybdenum and zirconium dioxide bonded with zirconium dioxide.
  • the dip coat formulations were as follows:
  • DIPCOA'I SLURRY FORMULATIONS (WEIGHT PERCENT) Material Facing Adjacent Back-up slurry facing slurries slurries Trioxodi zirconium hydroxychloride (20% Z1O2 in solution (in water) 23. 7 27. 5 18. 3 16.1 Diacetatozirconic acid (22% ZlOz in solution (in water) 0 0 0 0 12.2 Columbium powder (minus 325 mesh) 3 72. 48. 2 32. 6 0 Molybdenum grain (minus 100 plus 200 mesh) 0 33. 5 32. 4 0 Zirconia grain (minus plus mesh) 0 0 8. 9 32. 1 Zirconia flour (minus 325 mesh) 0 0 0 0 29. 5 Zirconia grain (minus 80 mesh) 0 0 0 0 26. 2
  • the pattern was successively dip coated, drained, stuccoed, dried to form the final mold. Thirteen coatings in all were applied.
  • the stuccoing material employed to the first three dip coats was '60 +200 mesh tantalum grain while that applied to the third and successive dip coats was 10 +50 mesh zircon aggregate. In all instances, the coatings were dried below a moisture content of 20% by volume before the next coating was applied.
  • the mold was dried at 250 F. for 4 hours and then heated in vacuo at the rate of 50200 F. per hour up to 2300 F., at which temperature it was held for 5 hours. After cooling in vacuo, the mold was ready for use.
  • EXAMPLE 4 This example illustrates tungsten and thorium dioxide integrally faced investment shell molds bonded with zirconium dioxide, and backed up with silicon dioxide and aluminumsilicate bonded with silicon dioxide.
  • the dip coat slurry formulations were as follows:
  • DIPCOAT SLURRY FORMULATIONS (WEIGHT PERCENT) Facing Adjacent Back-up Material slurry facing slurries slurries Hydrolyzed zirconium tetraethoxide ethylate solution ZrOz in ethanol) 15. 3 15. 0 14. 5 14. 0 0 Tungsten powder (minus 325 mesh) 82. 9 70.0 60.0 50. 0 0 Thorium dioxide powder (minus 325 mesh) 1. 8 1. 8 1. 8 1. 8 0 Thorium dioxide grain (minus plus 270 mesh). 0 13. 2 23. 7 34.
  • the alternate dip coat and stucco coats were built up in the manner above described.
  • the stuccoing material for the first three dip coats was 100 +200 mesh thorium oxide grain, and the material applied to the third and successive dipcoats was 50 +100 mesh calcined aluminum silicate grain. A total of 13 coatings was applied. As before, the pattern was removed from the mold after which the mold was dried and fired, whereupon it was ready for use.

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US589022A 1966-10-24 1966-10-24 Method of making investment shell molds for the high integrity precision casting of reactive and refractory metals Expired - Lifetime US3422880A (en)

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US3624758A (en) * 1968-07-12 1971-11-30 Caterpillar Tractor Co Method of making a sand mold with a back draft
US3957104A (en) * 1974-02-27 1976-05-18 The United States Of America As Represented By The Administrator Of The United States National Aeronautics And Space Administration Method of making an apertured casting
US3994346A (en) * 1972-11-24 1976-11-30 Rem Metals Corporation Investment shell mold, for use in casting of reacting and refractory metals
US4043381A (en) * 1976-08-09 1977-08-23 The United States Of America As Represented By The Secretary Of The Air Force Self-destructive core mold materials for metal alloys
US4417381A (en) * 1981-04-14 1983-11-29 Rolls-Royce Limited Method of making gas turbine engine blades
US4526312A (en) * 1979-12-10 1985-07-02 Rockwell International Corporation Low cost method of making superplastically formed and diffusion bonded structures
US4703806A (en) * 1986-07-11 1987-11-03 Howmet Turbine Components Corporation Ceramic shell mold facecoat and core coating systems for investment casting of reactive metals
US4754798A (en) * 1987-09-15 1988-07-05 Metal Casting Technology, Inc. Casting metal in a flowable firmly set sand mold cavity
EP0554198A1 (en) * 1992-01-30 1993-08-04 Howmet Corporation Oxidation resistant superalloy castings
WO1999030854A1 (en) * 1997-12-15 1999-06-24 Pcc Structurals, Inc. Method for imaging inclusions in investment castings
US6237671B1 (en) 1997-10-30 2001-05-29 Howmet Research Corporation Method of casting with improved detectability of subsurface inclusions
US6619368B1 (en) 1997-12-15 2003-09-16 Pcc Structurals, Inc. Method for imaging inclusions in investment castings
US20050189050A1 (en) * 2004-01-14 2005-09-01 Lockheed Martin Corporation Energetic material composition
US20060233685A1 (en) * 2005-04-15 2006-10-19 Janes Clarence W Non-aqueous method for separating chemical constituents in spent nuclear reactor fuel
US20070277914A1 (en) * 2006-06-06 2007-12-06 Lockheed Martin Corporation Metal matrix composite energetic structures
US20100024676A1 (en) * 2006-06-06 2010-02-04 Lockheed Martin Corporation Structural metallic binders for reactive fragmentation weapons
US20100119728A1 (en) * 2006-04-07 2010-05-13 Lockheed Martin Corporation Methods of making multilayered, hydrogen-containing thermite structures
CN103537620A (zh) * 2013-09-30 2014-01-29 中国航空工业集团公司北京航空材料研究院 一种钛铝基合金定向凝固熔模精密铸造模壳的制备方法
US20150217366A1 (en) * 2012-10-09 2015-08-06 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150224569A1 (en) * 2012-10-09 2015-08-13 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150266085A1 (en) * 2012-10-09 2015-09-24 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150273571A1 (en) * 2012-10-09 2015-10-01 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20150283601A1 (en) * 2012-10-09 2015-10-08 Mitsubishi Hitachi Power Systems, Ltd. Precision casting mold and method of producing the same
US20170246677A1 (en) * 2016-02-29 2017-08-31 General Electric Company Casting with metal components and metal skin layers
CN114570882A (zh) * 2022-03-10 2022-06-03 西部金属材料股份有限公司 一种钨面层型壳的制备方法
US11485687B2 (en) * 2016-06-17 2022-11-01 AGC Inc. Ceramic coating film-provided member and glass article manufacturing apparatus using it

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US3802482A (en) * 1972-03-09 1974-04-09 United Aircraft Corp Process for making directionally solidified castings
FR2407770A1 (en) * 1977-11-07 1979-06-01 Rem Metals Corp Mould for casting reactive and refractory metals - has an inert facing contg. metal (oxy)fluoride, heat sink material and binder
FR2509567B1 (fr) * 1981-07-10 1985-07-19 Lcc Cice Cie Euro Composants E Procede de fabrication d'un boitier pour encapsulation de composants formant un circuit electronique
EP0413033A4 (en) * 1989-02-10 1991-10-02 Nippon Shokubai Kagaku Kogyo Co. Ltd. Zirconia sol, preparation thereof, slurry for use in the production of porous ceramic, and porous ceramic produced from said slurry
US5275759A (en) * 1989-02-10 1994-01-04 Nippon Shokubai Kagaku Kogyo Co., Ltd. Zirconia sol, method for production thereof, porous ceramic-producing slurry, and porous ceramic product obtained by use thereof
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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624758A (en) * 1968-07-12 1971-11-30 Caterpillar Tractor Co Method of making a sand mold with a back draft
US3994346A (en) * 1972-11-24 1976-11-30 Rem Metals Corporation Investment shell mold, for use in casting of reacting and refractory metals
US3957104A (en) * 1974-02-27 1976-05-18 The United States Of America As Represented By The Administrator Of The United States National Aeronautics And Space Administration Method of making an apertured casting
US4043381A (en) * 1976-08-09 1977-08-23 The United States Of America As Represented By The Secretary Of The Air Force Self-destructive core mold materials for metal alloys
US4526312A (en) * 1979-12-10 1985-07-02 Rockwell International Corporation Low cost method of making superplastically formed and diffusion bonded structures
US4417381A (en) * 1981-04-14 1983-11-29 Rolls-Royce Limited Method of making gas turbine engine blades
US4703806A (en) * 1986-07-11 1987-11-03 Howmet Turbine Components Corporation Ceramic shell mold facecoat and core coating systems for investment casting of reactive metals
US4754798A (en) * 1987-09-15 1988-07-05 Metal Casting Technology, Inc. Casting metal in a flowable firmly set sand mold cavity
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FR1585162A (enrdf_load_stackoverflow) 1970-01-09
DE1758845A1 (de) 1971-03-04
CH491699A (fr) 1970-06-15
DE1758845B2 (de) 1973-04-12
DE1758845C3 (de) 1973-10-31
GB1234575A (enrdf_load_stackoverflow) 1971-06-03

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