US2373405A - Process of making seamless hollow bodies of refractory metals - Google Patents

Process of making seamless hollow bodies of refractory metals Download PDF

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US2373405A
US2373405A US378948A US37894841A US2373405A US 2373405 A US2373405 A US 2373405A US 378948 A US378948 A US 378948A US 37894841 A US37894841 A US 37894841A US 2373405 A US2373405 A US 2373405A
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metal
core
hollow bodies
rod
refractory metals
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Lowit Rudolf
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CALLITE TUNGSTEN Corp
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CALLITE TUNGSTEN CORP
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/031—Pressing powder with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/038—Spot welding with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4981—Utilizing transitory attached element or associated separate material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12292—Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.]

Definitions

  • PROCESS OF MAKING SEAMLESS HOLLOW BODIES OF REFRACTORY METALS Filed Feb. 14, 1941 warm/6 0.//7 6.44m caff INVENTOR. /U' 0W/7 ATTORNEY Patented pr. l0, 1945 NETE@ STATES maar ottica PROCESS 0F MAKING SEAMLESS HOLLOW BODIES 0F REFRACTORY METALS Rudolf Lowit, Union City, N. l., assignor to Callite Tungsten Corporation, Union City, N. d., a oorporation of Delaware l Claims.A
  • the present invention relates to the manufacture of seamless tubes of refractory metals such as tungsten, molybdenum, tantalum and columbium.
  • a hollow body of the metals contained in the group including' tungsten, molybdenum, tan taluni, and their alloys or composite bodies of said metals by pressing a body from the metallic powder about a forming core.
  • the pressed body is then subjected to a sintering process during which the metallic powder sinters and frits into a coherent body capable oi being forged, rolled or swaged, and subsequently drawn.
  • the forming core may be removed as an incident to the temperatures employed in sintering or :ritting the metallic body, which 'temperatures are suiilciently high to melt or volatilize out the material of which the forming core is made.
  • the forming core be of metal, it should ordinarily have a melting point considerably dlerent from that of the metal of which the tube is to be formed. lt should also have a coeicient of expansion not greater than said tube metal and preferably considerably lower.
  • the core material if metal, should either be of a metal that will not readily alloy nor form compounds with the tube metal or else it should be coated or sleeved with such va metal or other compound to prevent such alloying or reaction. Suitable for such cores are alloys of nickel, iron, chromium, etc., and particularly the alloy of nickel and steel known as Invar which has a nickel content of 36% and a very low coedicient of expansion.
  • a die of the desired shape is partially lled with a refractory metal in nely divided form. This is then tamped down and a rod, which is to be the forming core, is placed centrally on this metal, More of the same metal powder is then placed in the die in such manner that the forming core is disposed Within the mass. 55
  • the whole assemblage is then subjected to considerable pressure so as to form the metal powders into a compact body about the forming core.
  • This body is then removed and subjected to a preliminary sintering at a temperature suflicient to bring the metallic powders into a coherent body with the forming core still disposed therein in a neutral or reducing atmosphere or in a vacuum.
  • the metallic body attains sufficient coherence to be handled, and it is then placed between electric termini and electric current is passed directly through it until it is heated .to a point short of the fusing temperature.
  • This heating may be done by passing a current directly through the body, or by any other means such as by high frequency induction.
  • the core crops out, melts out, or distils ofi according to its nature, through a properly provided opening, and there results a coherent, strong, hollow, metallic body.
  • the drawing presents a flow diagram showing the various steps of the process.
  • the die or mould is i'lrst filled approximately half ull of finely divided metal such as molybdenum which is tamped down.
  • a rod of borosilicate glass is then centered in the die on top of the metal powder. More of the metal powder is then added to lill the die, the glass rod remaining in the center' thereof.
  • the metal powder thus in the die is then subjected to a high pressure, hydraulic or otherwise, ci the order of l@ or 213 tons per square inch, or even higher, in order to compress and densely compact the metal powder as uniformly as possible.
  • the compacted mass with the glass core stili in place is then sinte'red by placing lt in a furnace in a neutral or reducing atmosphere or in a vacuum.
  • rIhe body may be mounted during the sintering step in a vertical position between two electrodes and heated by direct pas sage of current to slightly below the meltingpclnt of the metal. Below this temperature the glass rod melts and flows out or drops out, leaving a smooth, clean passage through the metal body.
  • the molybdenum body with the cylindrical opening so formed by the removal of the borosilicate glass rod is then removed from the furnace.
  • a rod. which may be of metal or other suitable material, is then inserted in the hole in the center of the body and the assemblage so formed is then introduced into a swaging machine and swaged down in known manner.
  • the core is removed, mechanically-or otherwise, and there results a strong molybdenum tube of fibrous *VVeonstruenon-i innescare!
  • thezbody may 1 1 v t @internmlybzlemm,v thereby1s,inf rr1eSaid 1 f 1 I f 1 be relied or: forsean Thermal stier may bei draw-g 1 1drlwnzbvdyand meltingrwt ,Seid bOQSH-f 11 m511iv1-1--irv -*rvf1 fff categlasscorepinsertingafmetalrodinto'the i '11' IfiThe procedure sbeveideseribed for molybdenum 1 'hollowleft by'siaidfe: endiswaeng @WMO fie-11 11 1 *Ywithslightlmodyerionsasltotemneratureandv/Siredsze@ 1 1 1 i ienne; win: 'also' apply for mngsten; cantslum,1 ed.1 l 1 1 1 12; method of; making
  • the method of forming a seamless molybper square inch, and then heating to a, temdenum tube which comprises pressing nely perature slightly below the melting point of the divided molybdenum powder in a die about av metal, thereby sintering said metal and melting borosilicate glass core, heating said pressed body 50 out said rod of borosilicate glass. so formed to a temperature just below the melt- RUDOLF LOWIT.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Description

April l0, 1945., R. LowlT 2,373,405
PROCESS OF MAKING SEAMLESS HOLLOW BODIES OF REFRACTORY METALS Filed Feb. 14, 1941 warm/6 0.//7 6.44m caff INVENTOR. /U' 0W/7 ATTORNEY Patented pr. l0, 1945 NETE@ STATES maar ottica PROCESS 0F MAKING SEAMLESS HOLLOW BODIES 0F REFRACTORY METALS Rudolf Lowit, Union City, N. l., assignor to Callite Tungsten Corporation, Union City, N. d., a oorporation of Delaware l Claims.A
The present invention relates to the manufacture of seamless tubes of refractory metals such as tungsten, molybdenum, tantalum and columbium.
It is an object of this invention to provide seamless tubes, tubular parts, or hollow bodies of various cross-sectional shape, which are useful in operations Where high temperatures are encountered. For this purpose the high melting point metals above mentioned are distinctly suitu able but hitherto no practical method has been devised for manufacturing them .in tubular form.
it is contemplated by the present invention to form a hollow body of the metals contained in the group including' tungsten, molybdenum, tan taluni, and their alloys or composite bodies of said metals, by pressing a body from the metallic powder about a forming core. The pressed body is then subjected to a sintering process during which the metallic powder sinters and frits into a coherent body capable oi being forged, rolled or swaged, and subsequently drawn. The forming core may be removed as an incident to the temperatures employed in sintering or :ritting the metallic body, which 'temperatures are suiilciently high to melt or volatilize out the material of which the forming core is made.
lr' the forming core be of metal, it should ordinarily have a melting point considerably dlerent from that of the metal of which the tube is to be formed. lt should also have a coeicient of expansion not greater than said tube metal and preferably considerably lower. Furthermore, the core material, if metal, should either be of a metal that will not readily alloy nor form compounds with the tube metal or else it should be coated or sleeved with such va metal or other compound to prevent such alloying or reaction. Suitable for such cores are alloys of nickel, iron, chromium, etc., and particularly the alloy of nickel and steel known as Invar which has a nickel content of 36% and a very low coedicient of expansion.
I have found various compounds of silicon, such as quartz, pyrex glass, or other boro-silicate glasses, to be especially suitable for use as a formingv core. Sillimanite and carborundum may also be satisfactorily used.
According to the preferred method of the invention, a die of the desired shape is partially lled with a refractory metal in nely divided form. This is then tamped down and a rod, which is to be the forming core, is placed centrally on this metal, More of the same metal powder is then placed in the die in such manner that the forming core is disposed Within the mass. 55
The whole assemblage is then subjected to considerable pressure so as to form the metal powders into a compact body about the forming core. This body is then removed and subjected to a preliminary sintering at a temperature suflicient to bring the metallic powders into a coherent body with the forming core still disposed therein in a neutral or reducing atmosphere or in a vacuum. At this point the metallic body attains sufficient coherence to be handled, and it is then placed between electric termini and electric current is passed directly through it until it is heated .to a point short of the fusing temperature. This heating may be done by passing a current directly through the body, or by any other means such as by high frequency induction. During this treatment the core crops out, melts out, or distils ofi according to its nature, through a properly provided opening, and there results a coherent, strong, hollow, metallic body.
The drawing presents a flow diagram showing the various steps of the process.
es shown in the diagram, the die or mould is i'lrst filled approximately half ull of finely divided metal such as molybdenum which is tamped down. A rod of borosilicate glass is then centered in the die on top of the metal powder. More of the metal powder is then added to lill the die, the glass rod remaining in the center' thereof. The metal powder thus in the die is then subjected to a high pressure, hydraulic or otherwise, ci the order of l@ or 213 tons per square inch, or even higher, in order to compress and densely compact the metal powder as uniformly as possible. The compacted mass with the glass core stili in place is then sinte'red by placing lt in a furnace in a neutral or reducing atmosphere or in a vacuum. rIhe body may be mounted during the sintering step in a vertical position between two electrodes and heated by direct pas sage of current to slightly below the meltingpclnt of the metal. Below this temperature the glass rod melts and flows out or drops out, leaving a smooth, clean passage through the metal body.
The molybdenum body with the cylindrical opening so formed by the removal of the borosilicate glass rod is then removed from the furnace. A rod. which may be of metal or other suitable material, is then inserted in the hole in the center of the body and the assemblage so formed is then introduced into a swaging machine and swaged down in known manner. When the tubing has been reduced to the desired size, the core is removed, mechanically-or otherwise, and there results a strong molybdenum tube of fibrous *VVeonstruenon-i innescare! swinging; thezbodymay 1 1 v t @internmlybzlemm,v thereby1s,inf rr1eSaid 1 f 1 I f 1 be relied or: forsean Thermal stier may bei draw-g 1 1drlwnzbvdyand meltingrwt ,Seid bOQSH-f 11 m511iv1-1--irv -*rvf1 fff categlasscorepinsertingafmetalrodinto'the i '11' IfiThe procedure sbeveideseribed for molybdenum 1 'hollowleft by'siaidfe: endiswaeng @WMO fie-11 11 1 *Ywithslightlmodincationsasltotemneratureandv/Siredsze@ 1 1 1 i ienne; win: 'also' apply for mngsten; cantslum,1 ed.1 l 1 1 1 12; method of; making aI seamless :tope @f1 1 1 1 f iiunlloium,1 composite :bodies of i 'said metals; my f v 1molyhdemim,v tungsten nr; like refractory metal f their rim-emi? metal o 2 Hnweyer, if f tungsten, y 1 1comprisinspressinggseid refractory meter about imetiis :usedand:aipyrexgiasseorethere wo111d-1i a1borosilicategiassmdsnteringsaid: pressed 1 ne little,1 iff any; change necessarmvl'yrex'glaiss; i metal in 1 a neutral; or; 1 educing atmospliereI by 1 forinstiance,- will; melt Eand Iflow;atlabout; i200? i I mounting said body between electrodes and pass'.v
wriesiiicen oxide distiisiouti at temperetureso i ing 1'ciurrent throfueh Iseid:sirnre'red body, thereby s 1 l "theorder of 1BGD" C orhighen r: 1 1 1vheating; i1, toia temperature slightlybelowlthe 1 1 y 1 1 y z 1 y 1 l f 1 It; is witlriin the lconteignplation of the irivveifltiong I melting point of: the metal@ at the same timemeltf i "'that the forr'ning core'mayevenbef ois.1 metal 'l5 ing outy the Iborosilioate1glass rod; then inserting l f i v iraving a melting pointashign :aslorzhignerthan: 1 t 1 i a rodofmetaiinthe passage formedby the said f Ithe meltingpoint of ItheI tube metal; It 'snouicLI 1 1 1 1 1 f vnd;drawing1 said 1 sus@ I 1 Iimameiong and zshrmid niet @berofametaiithat woud; 1 i 1 r 13. @'Ihemethod: of making@ Seamless tubing ie! l *alloy with thetube' metal; For instance, if; the 291 dense molybdcnummetalcom rising the :steps o1 i tube metal ismolybderium,it Wouldbe quite prac-5' 1' cnmpaeting, molybdenum 1 I 1er.l 1 powder u 1 e 1 l Itical and within the souper of@ the' invention to use i 1 pressure; of the ,order of; 101tof21l1tons perso 1 r l f a rod of tungstenproperlyfcoated lorsleeved; with i i 1 inch; about 1a 1 core of orosilieate glass; heating 1 highI melting point oxides susha's, the oxidego` 1 1 said body so ffoi'med to a, temperaturejustbelow i i beryllium; magnesiom1,izirconium,; ori thorium; ias@ i251 the v1r eltizns paint iof molybdenum and above Ithe f v 1 the forming' leere; iaitho'u'gh tungstenhas La cm1-2 i i me? l point Ofi the said elassfcord thereby :sine f1siderablyhigherimelting poiritthan has molyb-1 wtering the powdered molybdenum andmelting :out l l deniim; Its coefficient of expansion; lfilowever,v isi the 1saidglasscore1; inserting 1a metal rod into the 1 f close vto that 'olfI pyrex glass 1and because ofI itsk l opening left by Saidmeltedoutcore;mechanically 1 i vcoatingit; Wilinot: ailoywith molybdenuinp "Ihere 301 WOIkine Said sintered body; about said metal rod@ 1 l are Icertain practical advantages in 'usinga tung l 1 i until Said bodyis reduced tovdensve metallic conel 1 `fsten'rodinitnisimannersiricethe:tube:maybe1I ldition? and thenzremovinggseidmetal rod.1 .11 i y 11 1 1 formed g about lit anda lafterlthe sintering step, the l 1 whole assembly centered; about? the tungsten ,coi-el i 1 which stili rerlnainsmay he swaged; :forged: rolled 1 i and drawnw'ithout: the necessity 1 ofzremovng the 1 core; and inserting; a newI rodi in place thereof.: 1 After the sw'aging,v rolling,1 forging and drawing l inea die of raisuitabl fllmll filling Sdlde ap* 1 isI completed; however; 1rthe tungsteri1 core kmay l proximately lhalfI fullI withnelyj divided rerse I be removed mechanically; 1I may :also vuse ias a i 4i@ tory metalicenterng: a rod of borosiiiceteI glass;
core material, Where the body material is molybupon said metal in said die, completely filling denum, a rod of molybdenum coated with high said die with more of the nely divided refractory melting point oxides. metal with the glass rod remaining centered Having thus described my invention, what I 45 therein, subjecting the powdered metal in said claim is: l 1 die to a pressure of approximately 10 to 20 tons 1. The method of forming a seamless molybper square inch, and then heating to a, temdenum tube which comprises pressing nely perature slightly below the melting point of the divided molybdenum powder in a die about av metal, thereby sintering said metal and melting borosilicate glass core, heating said pressed body 50 out said rod of borosilicate glass. so formed to a temperature just below the melt- RUDOLF LOWIT.
o 14; 11i/retired of making; a Is1eam111ess1 mbe sf tu group; consisting 1 off 1 tungsten, f molybdennm "1 tantaium; columbium and the alloys; and com: posite bodiesI ofi said metals capable :or beine i lmechenieallrworkd that consists ,in first Pmi/id
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Cited By (46)

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US2652623A (en) * 1945-03-10 1953-09-22 Westinghouse Electric Corp Manufacture of refractory metal tubes
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US2679669A (en) * 1949-09-21 1954-06-01 Thompson Prod Inc Method of making hollow castings
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US3442172A (en) * 1959-03-13 1969-05-06 Fansteel Inc Gun barrel liner
US3600791A (en) * 1968-06-14 1971-08-24 Motor Wheel Corp Method of making a composite brake drum
US3641665A (en) * 1969-02-13 1972-02-15 Thomson Csf Method of manufacturing hollow superconducting bodies
US3652317A (en) * 1970-05-01 1972-03-28 Getters Spa Method of producing substrate having a particulate metallic coating
US3689964A (en) * 1971-02-25 1972-09-12 Allegheny Ludlum Ind Inc Machining sintered powder metal
US3810302A (en) * 1971-12-09 1974-05-14 Philips Corp Method of manufacturing a wave-guide
US3823463A (en) * 1972-07-13 1974-07-16 Federal Mogul Corp Metal powder extrusion process
US3832763A (en) * 1972-04-22 1974-09-03 Bluecher Wahlstatt Leichtmet Method of drop-forging sintered workpieces
US3834003A (en) * 1972-11-02 1974-09-10 Airco Inc Method of particle ring-rolling for making metal rings
US3982904A (en) * 1973-06-27 1976-09-28 Viking Metallurgical Corporation Metal rings made by the method of particle ring-rolling
FR2533468A1 (en) * 1982-09-23 1984-03-30 Nyby Uddeholm Ab Capsule for blanks used for the extrusion of parts, particularly of tubes
US5710969A (en) * 1996-03-08 1998-01-20 Camax Tool Co. Insert sintering
US20020168282A1 (en) * 2001-05-14 2002-11-14 Lu Jyh-Woei J. Sintering process and tools for use in metal injection molding of large parts
US6770114B2 (en) 2001-12-19 2004-08-03 Honeywell International Inc. Densified sintered powder and method
US9194258B2 (en) 2012-02-27 2015-11-24 Pratt & Whitney Canada Corp. Gas turbine engine case bosses

Cited By (47)

* Cited by examiner, † Cited by third party
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US2902747A (en) * 1959-09-08 Reiter
US2652623A (en) * 1945-03-10 1953-09-22 Westinghouse Electric Corp Manufacture of refractory metal tubes
US2540233A (en) * 1948-07-10 1951-02-06 Battelle Development Corp Method of producing porous metallic bodies
US2907705A (en) * 1948-11-30 1959-10-06 Blainey Alan Thermal fission reactor compositions and method of fabricating same
US2695230A (en) * 1949-01-10 1954-11-23 Michigan Powdered Metal Produc Process of making powdered metal article
US2628166A (en) * 1949-02-28 1953-02-10 Haller John Process of making chambered articles containing a movable element
US2628138A (en) * 1949-03-18 1953-02-10 Michigan Powdered Metal Produc Porous chambered bearing
US2665960A (en) * 1949-04-16 1954-01-12 Michigan Powdered Metal Produc Fluid-permeable article and process of making the same
US2938791A (en) * 1949-05-26 1960-05-31 Blainey Alan Method of producing shaped bodies from powdered metals
US2628516A (en) * 1949-07-09 1953-02-17 Westinghouse Electric Corp Tube making process
US2679669A (en) * 1949-09-21 1954-06-01 Thompson Prod Inc Method of making hollow castings
US2688781A (en) * 1949-11-12 1954-09-14 Schwoegler Self-eliminating core wire and core
US2751293A (en) * 1951-07-31 1956-06-19 Allied Prod Corp Process of making perforated powdered metal article
US2992172A (en) * 1951-11-26 1961-07-11 Blainey Alan Fuel elements for nuclear reactors
US2961758A (en) * 1952-01-16 1960-11-29 Owens Corning Fiberglass Corp Method of making a metal element
US3025765A (en) * 1952-01-30 1962-03-20 Westinghouse Electric Corp Segmented ring-type refractory metal liners for guns
US2851354A (en) * 1954-01-13 1958-09-09 Schwarzkopf Dev Co Process of forming sintered sheets having copper infiltrated portions
US2942970A (en) * 1955-04-19 1960-06-28 Sintercast Corp America Production of hollow thermal elements
US2895191A (en) * 1955-07-11 1959-07-21 Hills Mccanna Co Method of and apparatus for precision coring in the casting of metallic articles
US2991520A (en) * 1956-01-13 1961-07-11 Howard Foundry Company Cored passageway formation
US2972805A (en) * 1956-06-20 1961-02-28 Int Nickel Co Production of hollow metal articles
US3008204A (en) * 1958-10-29 1961-11-14 Beryllium Corp Precision casting method and apparatus
US3442172A (en) * 1959-03-13 1969-05-06 Fansteel Inc Gun barrel liner
US3011233A (en) * 1959-09-04 1961-12-05 Gen Electric Refractory sulfide casting cores
US3168399A (en) * 1960-05-11 1965-02-02 Mitsubishi Atomic Power Ind Method of producing circularly cylindrical members of material composed essentially of zirconium and/or niobium
US3173314A (en) * 1961-02-15 1965-03-16 Norton Co Method of making core drills
US3261121A (en) * 1961-10-13 1966-07-19 Joseph R Eves Gun barrel with explosively welded liner
US3293731A (en) * 1962-06-04 1966-12-27 Curtis Instr Method of making a coulometric device
US3271849A (en) * 1962-11-26 1966-09-13 Int Nickel Co Iridium-sheathed wire for electron tubes
US3268997A (en) * 1963-05-14 1966-08-30 Wall Colmonoy Corp Method of making a porous sealing device
US3380856A (en) * 1964-06-12 1968-04-30 Licentia Gmbh Method of making fuel cell electrodes comprised of borides, carbides, nitrides and/or silicides of one or more transition metals
US3327378A (en) * 1965-03-11 1967-06-27 Beckman Instruments Inc Method for making packed columns for chromatography
US3600791A (en) * 1968-06-14 1971-08-24 Motor Wheel Corp Method of making a composite brake drum
US3641665A (en) * 1969-02-13 1972-02-15 Thomson Csf Method of manufacturing hollow superconducting bodies
US3652317A (en) * 1970-05-01 1972-03-28 Getters Spa Method of producing substrate having a particulate metallic coating
US3689964A (en) * 1971-02-25 1972-09-12 Allegheny Ludlum Ind Inc Machining sintered powder metal
US3810302A (en) * 1971-12-09 1974-05-14 Philips Corp Method of manufacturing a wave-guide
US3832763A (en) * 1972-04-22 1974-09-03 Bluecher Wahlstatt Leichtmet Method of drop-forging sintered workpieces
US3823463A (en) * 1972-07-13 1974-07-16 Federal Mogul Corp Metal powder extrusion process
US3834003A (en) * 1972-11-02 1974-09-10 Airco Inc Method of particle ring-rolling for making metal rings
US3982904A (en) * 1973-06-27 1976-09-28 Viking Metallurgical Corporation Metal rings made by the method of particle ring-rolling
FR2533468A1 (en) * 1982-09-23 1984-03-30 Nyby Uddeholm Ab Capsule for blanks used for the extrusion of parts, particularly of tubes
US5710969A (en) * 1996-03-08 1998-01-20 Camax Tool Co. Insert sintering
US20020168282A1 (en) * 2001-05-14 2002-11-14 Lu Jyh-Woei J. Sintering process and tools for use in metal injection molding of large parts
US6838046B2 (en) 2001-05-14 2005-01-04 Honeywell International Inc. Sintering process and tools for use in metal injection molding of large parts
US6770114B2 (en) 2001-12-19 2004-08-03 Honeywell International Inc. Densified sintered powder and method
US9194258B2 (en) 2012-02-27 2015-11-24 Pratt & Whitney Canada Corp. Gas turbine engine case bosses

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