US2932882A - Method of preparing powdered refractory metals for mechanical working - Google Patents

Method of preparing powdered refractory metals for mechanical working Download PDF

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Publication number
US2932882A
US2932882A US412668A US41266854A US2932882A US 2932882 A US2932882 A US 2932882A US 412668 A US412668 A US 412668A US 41266854 A US41266854 A US 41266854A US 2932882 A US2932882 A US 2932882A
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United States
Prior art keywords
refractory metals
mechanical working
powdered refractory
sheath
preparing powdered
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Expired - Lifetime
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US412668A
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Jr John C R Kelly
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Individual
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Classifications

    • 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
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • B22F3/1216—Container composition
    • B22F3/1241—Container composition layered
    • 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
    • Y10S29/045—Titanium
    • 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
    • Y10T29/49805—Shaping by direct application of fluent pressure
    • 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
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49927—Hollow body is axially joined cup or tube
    • Y10T29/49929—Joined to rod

Definitions

  • the present invention relates to the cladding or sheathing of a base structure and a method of providing same.
  • a structure be formed by placing solid or pressed metal or a mixture of metal and nonmetal powders in a tight-fitting metal sheath of the desired configuration, encasing the assembly in a rubber bag or container which is closed by a suitable watertight stopper and then subjecting the assembly to a hydrostatic pressure ranging from a few hundred to 60,000 pounds per square inch, depending upon the properties of the elements.
  • a hydrostatic pressure ranging from a few hundred to 60,000 pounds per square inch, depending upon the properties of the elements.
  • the resultant tightly gripped metal may be fully enclosed by welding or brazing the open end of the sheath and the result will be'a container of minimum air or gas space.
  • United States Patent the practical thickness of the sheath is limited by the hydrostatic pressure to be employed and it has been found that the sheath may be 0.2 inch or more in thickness for nickel when 60,000 pounds per square inch pressure is employed.
  • the assembly may be further mechanically worked to increase the tightness of the sheath on the structure or to improve the mechanical properties of the finished product.
  • a bar of molybdenum of unusual shape may be enclosed in a tube of Inconel to obtain the superior strength of molybdenum at 1000 C. combined with the oxidation resistance of Inconel.
  • the method of preparing powdered refractory metals for mechanically Working comprising the steps of forming a unit by pressing powdered refractory base metal into solid form and encasing same within a deformable tubular member composed of corrosion resistant metal, the Wall thickness of said tubular member being substantially 0.2 inch and in tight-fitting relationship with the base metal, enclosing said unit with a tight-fitting flexible rubber-like container, sealing said container to provide a fluid tight assembly, subjecting said assembly to a high fluid pressure in all directions and within a range of 1,000 to 60,000 pounds per square inch to unite said tubular member and the base metal, whereupon the base metal is prepared for subsequent mechanical working.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Description

METHOD OF PREPARING POWDEREl) REFRAC- TORY METALS FOR MECHANICAL WORKNG Application February 25, 1954 Serial No. 412,668
1 Claim. (Cl. 29-420) No Drawing.
The present invention relates to the cladding or sheathing of a base structure and a method of providing same.
Sheath rolling of titanium, Zirconium or beryllium powders is a commonly employed method in the art and in the practice of the method metallic powders are pressed to a desired shape, are enclosed in an iron tube of thin wall construction, the air within the tube is replaced with an inert gas, and the tube is. then welded shut. By this arrangement the powders may be handled while at elevated temperatures without special atmospheres.
Several objections are encountered in the practice of this process, however, since the lit of the sheath is not always good. and wrinkling and'folding occur during working. This leaves a deformed product when the sheath is subsequently removed by chemical or mechanical means.
It has also been the practice to electrodeposit coatings to structures formed of metals or nonmetals in order to impart oxidation resistance, electrical conductivity, etc. In many such uses either the surface or the coating is not compatible with the other or with electrodeposition and it has been found that with electrodeposition an appreciable thickness such as 0.2 inch is diflicult to achieve for many oxidation resistant alloys.
In the present invention it is proposed to provide a clad or sheath adaptable for oxidation or corrosion resistance without the necessity for alloying which in many cases is impossible or undesirable due to such side eflects as embrittlement.
In the practice of the present invention it is proposed that a structure be formed by placing solid or pressed metal or a mixture of metal and nonmetal powders in a tight-fitting metal sheath of the desired configuration, encasing the assembly in a rubber bag or container which is closed by a suitable watertight stopper and then subjecting the assembly to a hydrostatic pressure ranging from a few hundred to 60,000 pounds per square inch, depending upon the properties of the elements. Where the structure is to be used in sheath rolling the resultant tightly gripped metal may be fully enclosed by welding or brazing the open end of the sheath and the result will be'a container of minimum air or gas space. of course United States Patent the practical thickness of the sheath is limited by the hydrostatic pressure to be employed and it has been found that the sheath may be 0.2 inch or more in thickness for nickel when 60,000 pounds per square inch pressure is employed.
When it is proposed to utilize the oxidation resistant coating or property imparted by the surface metal and maintain the strength or other property of the enclosed metal it may be used in that form without removal of thecoating, or, when desired, the assembly may be further mechanically worked to increase the tightness of the sheath on the structure or to improve the mechanical properties of the finished product.
As an example, it has been found that a bar of molybdenum of unusual shape may be enclosed in a tube of Inconel to obtain the superior strength of molybdenum at 1000 C. combined with the oxidation resistance of Inconel.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claim the invention may be practiced otherwise than as specifically described.
What is claimed is:
The method of preparing powdered refractory metals for mechanically Working comprising the steps of forming a unit by pressing powdered refractory base metal into solid form and encasing same within a deformable tubular member composed of corrosion resistant metal, the Wall thickness of said tubular member being substantially 0.2 inch and in tight-fitting relationship with the base metal, enclosing said unit with a tight-fitting flexible rubber-like container, sealing said container to provide a fluid tight assembly, subjecting said assembly to a high fluid pressure in all directions and within a range of 1,000 to 60,000 pounds per square inch to unite said tubular member and the base metal, whereupon the base metal is prepared for subsequent mechanical working.
OTHER REFERENCES Titanium, Report of Symposium on Titanium, March 1949, pages 27-30, published by Olfice of Naval Research, Washington, DC.
US412668A 1954-02-25 1954-02-25 Method of preparing powdered refractory metals for mechanical working Expired - Lifetime US2932882A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146747A (en) * 1960-06-22 1964-09-01 George J Schuller Pellet feed soldering iron
US3235958A (en) * 1961-10-09 1966-02-22 Commissariat Energie Atomique Method of cladding by hydrostatic pressure applied to heated units inside a cold liquid cladding apparatus
US3268997A (en) * 1963-05-14 1966-08-30 Wall Colmonoy Corp Method of making a porous sealing device
US3422523A (en) * 1963-06-26 1969-01-21 Martin Marietta Corp Process for fabricating nuclear reactor fuel elements
US3699642A (en) * 1971-04-08 1972-10-24 Westinghouse Electric Corp Method for bonding sheet metal cladding to a body
US3729971A (en) * 1971-03-24 1973-05-01 Aluminum Co Of America Method of hot compacting titanium powder
US3774290A (en) * 1972-02-09 1973-11-27 Brush Wellman Method of fabricating a beryllium-titanium composite
US3798740A (en) * 1972-10-02 1974-03-26 Davy Ashmore Ltd Method of extruding a porous compacted mass of metal powder having a sealed outer surface
US4117367A (en) * 1974-05-13 1978-09-26 U.S. Philips Corporation High-pressure discharge lamp
EP0141350A1 (en) * 1983-10-21 1985-05-15 Nyby Uddeholm Powder AB Method of preparing work pieces from metal powder

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US460921A (en) * 1891-10-06 Island
US1081125A (en) * 1912-02-07 1913-12-09 William D Leftwich Automatic train-pipe coupling.
US2276004A (en) * 1938-06-30 1942-03-10 Vidal Res Corp Method of forming veneer structures
US2375154A (en) * 1943-10-07 1945-05-01 Metals & Controls Corp Electric furnace
US2478037A (en) * 1944-09-02 1949-08-02 Joseph B Brennan Method of applying a silver layer to a steel bearing blank
US2615411A (en) * 1951-03-16 1952-10-28 Walton S Clevenger Method and apparatus for hydraulic work hardening
US2633523A (en) * 1949-03-25 1953-03-31 Gibson Refrigerator Co Range top structure
US2648125A (en) * 1947-08-06 1953-08-11 Kennametal Inc Process for the explosive pressing of powdered compositions
US2653494A (en) * 1946-12-24 1953-09-29 Edward C Creutz Method of forging metals
US2744314A (en) * 1950-08-09 1956-05-08 Jr Joseph Kinney Method of making multiply metal

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US460921A (en) * 1891-10-06 Island
US1081125A (en) * 1912-02-07 1913-12-09 William D Leftwich Automatic train-pipe coupling.
US2276004A (en) * 1938-06-30 1942-03-10 Vidal Res Corp Method of forming veneer structures
US2375154A (en) * 1943-10-07 1945-05-01 Metals & Controls Corp Electric furnace
US2478037A (en) * 1944-09-02 1949-08-02 Joseph B Brennan Method of applying a silver layer to a steel bearing blank
US2653494A (en) * 1946-12-24 1953-09-29 Edward C Creutz Method of forging metals
US2648125A (en) * 1947-08-06 1953-08-11 Kennametal Inc Process for the explosive pressing of powdered compositions
US2633523A (en) * 1949-03-25 1953-03-31 Gibson Refrigerator Co Range top structure
US2744314A (en) * 1950-08-09 1956-05-08 Jr Joseph Kinney Method of making multiply metal
US2615411A (en) * 1951-03-16 1952-10-28 Walton S Clevenger Method and apparatus for hydraulic work hardening

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146747A (en) * 1960-06-22 1964-09-01 George J Schuller Pellet feed soldering iron
US3235958A (en) * 1961-10-09 1966-02-22 Commissariat Energie Atomique Method of cladding by hydrostatic pressure applied to heated units inside a cold liquid cladding apparatus
US3268997A (en) * 1963-05-14 1966-08-30 Wall Colmonoy Corp Method of making a porous sealing device
US3422523A (en) * 1963-06-26 1969-01-21 Martin Marietta Corp Process for fabricating nuclear reactor fuel elements
US3729971A (en) * 1971-03-24 1973-05-01 Aluminum Co Of America Method of hot compacting titanium powder
US3699642A (en) * 1971-04-08 1972-10-24 Westinghouse Electric Corp Method for bonding sheet metal cladding to a body
US3774290A (en) * 1972-02-09 1973-11-27 Brush Wellman Method of fabricating a beryllium-titanium composite
US3798740A (en) * 1972-10-02 1974-03-26 Davy Ashmore Ltd Method of extruding a porous compacted mass of metal powder having a sealed outer surface
US4117367A (en) * 1974-05-13 1978-09-26 U.S. Philips Corporation High-pressure discharge lamp
EP0141350A1 (en) * 1983-10-21 1985-05-15 Nyby Uddeholm Powder AB Method of preparing work pieces from metal powder

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