US1996220A - Method of making tools and the like from sintered hard-metal carbides or like materials - Google Patents

Method of making tools and the like from sintered hard-metal carbides or like materials Download PDF

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Publication number
US1996220A
US1996220A US641117A US64111732A US1996220A US 1996220 A US1996220 A US 1996220A US 641117 A US641117 A US 641117A US 64111732 A US64111732 A US 64111732A US 1996220 A US1996220 A US 1996220A
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US
United States
Prior art keywords
hard
materials
tools
metal carbides
pressing
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Expired - Lifetime
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US641117A
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English (en)
Inventor
Tigerschlold Kjell Magnus
Sterky Gosta
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Individual
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Individual
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Publication of US1996220A publication Critical patent/US1996220A/en
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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making non-ferrous alloys
    • C22C1/04Making non-ferrous alloys by powder metallurgy
    • C22C1/05Mixtures of metal powder with non-metallic powder
    • C22C1/051Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • C22C1/053Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds

Definitions

  • This invention relates to improvements in the manufacture of tools and other objects subjected to abrasion, from sintered hard metal carbides or like material.
  • additional metals are partly to facilitate the sintering of the pulverous hard material to a dense body of a considerable hardness, partly to increase the toughness of the material.
  • other metals as for instance W, Mo, Ti or V may be added.
  • a solidifying binder such as dextrine or shellac
  • the tool has been given the shape desired by means of mechanical treatment after solidification of the binder.
  • this method has proved not to be suitable in practice, partly as it is very hard to obtain a homogeneous distribution of the binder in the form piece, partly as the product is easily made impure by the percentage of ash of the binder.
  • the said form pieces are subjected to a heating up to a temperature of 700-ll C., at which temperature the added auxiliary metal (Fe, Co, or Ni) acquires a binding effect.
  • the form pieces may be worked by ordinary tools,
  • the present invention relates to a process of making tools and the like from a pulverous mixture, which consists of a hard metal carbide, boride, silicide, or nitride, and one or more softer added auxiliary metals, ,such as iron, cobalt, or nickel, possibly together with one or more hard metals, such as tungsten, molybdenum, titanium, or vanadium, the final shape by mechanical working being given after the said mixture has been pressed to a form piece, after which working the final sintering is efiected.
  • a pulverous mixture which consists of a hard metal carbide, boride, silicide, or nitride, and one or more softer added auxiliary metals, , such as iron, cobalt, or nickel, possibly together with one or more hard metals, such as tungsten, molybdenum, titanium, or vanadium, the final shape by mechanical working being given after the said mixture has been pressed to a form piece, after
  • the mixture is subjected, before, after, or during the pressing, to the influence of such substances as with a chlorinating action attack the surfaces of the powder of the auxiliary metal, for example by addition of or treatment by chlorides, so that a coherent form piece is obtained, which is worked and then, possibly after the portion of the chlorinating substances which is still present has been expelled and the compounds formed have been decomposed for instance by reduction, and possibly after a subsequent pressing, is subjected to the final sintering.
  • the converting of the metal surfaces into chlorides may for instance be effected by mixing the pulverous mixture with dry powdered ammonium chloride; the powdered ammonium chloride may also be mixed during the grinding together of the hard particles with the softer auxiliary metal. of course, the pulverous mixture may also be moistened by means of a solution of ammonium chloride either in water or in suitable organic solvents, such as methyl alcohol or the like.
  • the form pieces become sufficiently well bound together to enable them to be worked to the desired shape.
  • it has proved to be suitableto employ heat treatment after the pressing but before the mechanical working to desired shapes, possibly in combination with the expelling of parts of the chlorinating substances which are still present or decomposition of the compounds formed, for instance by reduction.
  • the said treatment may be carried out with the effect desired at a very low temperature, in any case below 600 0., preferably at 400-500 C.
  • the product obtained may in this way be given an extraordinary suitable consistency for the working intended, and the wear and tear of the tool used becomes extremely small.
  • the method may be varied in dlfierent ways: The procedures mentioned must be regarded only as examples. It should be noticed that it is suitable to remove from the product the reaction products obtained in the form of gas and without it being necessary to raise the temperature too high, since a removal of heavy salts at high temperatures will easily cause the formation of blow holes in the material.
  • the first pressing is carried out at a relatively low pressure, for example 1000 kgs/cm
  • the second pressing operation after the heat treatment taking place at a considerably higher pressure for example 10,000 kgs/cm.
  • step of chlorinating may take place prior to, during. or subsequent to, the step of pressing.
  • the process of making solid bodies from a pulverous mixture which comprises mixing a comminuted compound of a hard metal, such as tungsten, tantalum, or titanium, and a metalloid, such as carbon, boron, or nitrogen, and at least one softer additional metal, such as iron, cobalt, or nickel, chlorinating the softer additional metal with ammonium chloride, and pressing the mixture into form pieces which are worked to the desired shape.
  • a hard metal such as tungsten, tantalum, or titanium
  • a metalloid such as carbon, boron, or nitrogen
  • at least one softer additional metal such as iron, cobalt, or nickel
  • the pulverous mixture contains, in addition, a hard metal, such as tungsten, tantalum, or titanium in metallic form.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
US641117A 1931-11-04 1932-11-03 Method of making tools and the like from sintered hard-metal carbides or like materials Expired - Lifetime US1996220A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1996220X 1931-11-04

Publications (1)

Publication Number Publication Date
US1996220A true US1996220A (en) 1935-04-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US641117A Expired - Lifetime US1996220A (en) 1931-11-04 1932-11-03 Method of making tools and the like from sintered hard-metal carbides or like materials

Country Status (4)

Country Link
US (1) US1996220A (fr)
FR (1) FR745076A (fr)
GB (1) GB408716A (fr)
NL (1) NL34502C (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2766141A (en) * 1951-10-19 1956-10-09 Carborundum Co Zirconium boride body impregnated with molybdenum silicide and method of making same
US2921861A (en) * 1953-08-19 1960-01-19 Fansteel Metallurgical Corp Method of forming titanium silicide refractory articles
US2963448A (en) * 1957-05-06 1960-12-06 Texaco Inc Tableting process for granular porous solid particles
US3036910A (en) * 1958-03-13 1962-05-29 Walter W Eichenberger Synthetic ferro-titanium briquette
US3110590A (en) * 1961-10-06 1963-11-12 Du Pont Compositions of molybdenum, nitrogen and silicon and shaped objects therefrom
US3161948A (en) * 1963-01-29 1964-12-22 Du Pont Compositions containing iron, molybdenu, silicon and selected low-melting metals
US3184834A (en) * 1961-12-19 1965-05-25 Du Pont Selected mo-nb-si-ti compositions and objects thereof
US3215615A (en) * 1951-05-04 1965-11-02 British Aluminium Co Ltd Current conducting element for aluminum production cells
US3409418A (en) * 1966-11-09 1968-11-05 Du Pont Dense products of vanadium or zirconium nitride with iron, nickel or cobalt
US3663297A (en) * 1970-06-24 1972-05-16 Us Navy Process for the preparation of sintered zinc powder battery electrodes
US3857157A (en) * 1972-05-16 1974-12-31 Lucas Industries Ltd Method of producing hot pressed components

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976738C (de) * 1940-11-23 1964-04-02 Degussa Verfahren zur Herstellung von Formkoerpern aus Metallpulver

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215615A (en) * 1951-05-04 1965-11-02 British Aluminium Co Ltd Current conducting element for aluminum production cells
US2766141A (en) * 1951-10-19 1956-10-09 Carborundum Co Zirconium boride body impregnated with molybdenum silicide and method of making same
US2921861A (en) * 1953-08-19 1960-01-19 Fansteel Metallurgical Corp Method of forming titanium silicide refractory articles
US2963448A (en) * 1957-05-06 1960-12-06 Texaco Inc Tableting process for granular porous solid particles
US3036910A (en) * 1958-03-13 1962-05-29 Walter W Eichenberger Synthetic ferro-titanium briquette
US3110590A (en) * 1961-10-06 1963-11-12 Du Pont Compositions of molybdenum, nitrogen and silicon and shaped objects therefrom
US3184834A (en) * 1961-12-19 1965-05-25 Du Pont Selected mo-nb-si-ti compositions and objects thereof
US3161948A (en) * 1963-01-29 1964-12-22 Du Pont Compositions containing iron, molybdenu, silicon and selected low-melting metals
US3409418A (en) * 1966-11-09 1968-11-05 Du Pont Dense products of vanadium or zirconium nitride with iron, nickel or cobalt
US3663297A (en) * 1970-06-24 1972-05-16 Us Navy Process for the preparation of sintered zinc powder battery electrodes
US3857157A (en) * 1972-05-16 1974-12-31 Lucas Industries Ltd Method of producing hot pressed components

Also Published As

Publication number Publication date
GB408716A (en) 1934-04-19
NL34502C (fr)
FR745076A (fr) 1933-05-01

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