GB378484A - Improvements relating to sintered hard metallic alloys and methods for the manufacture thereof - Google Patents

Improvements relating to sintered hard metallic alloys and methods for the manufacture thereof

Info

Publication number
GB378484A
GB378484A GB13139/31A GB1313931A GB378484A GB 378484 A GB378484 A GB 378484A GB 13139/31 A GB13139/31 A GB 13139/31A GB 1313931 A GB1313931 A GB 1313931A GB 378484 A GB378484 A GB 378484A
Authority
GB
United Kingdom
Prior art keywords
carbide
boron
carbon
carbides
hydrogen
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.)
Expired
Application number
GB13139/31A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Krupp Stahl AG
Fried Krupp AG
Original Assignee
Krupp Stahl AG
Fried Krupp AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Krupp Stahl AG, Fried Krupp AG filed Critical Krupp Stahl AG
Publication of GB378484A publication Critical patent/GB378484A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • C22C1/053—Making 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
    • C22C1/055—Making 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 using carbon

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

A sintered hard alloy for tools and implements consists of 75 per cent or more of boron carbide with one or more than one carbide of melting point exceeding 2000 DEG C., for example carbide of silicon, vanadium, tungsten molybdenum, titanium, hafnium or zirconium, and a metal or metals of lower melting point, particularly iron, nickel, cobalt or chromium. Boron, obtained for example by the reduction of boron trioxide with magnesium and subsequent treatment with hydrochloric acid may first be carburized to correspond with the formula B6C by carbon or hydrocarbon in a carbon tube furnace traversed by hydrogen. The carbide is intimately mixed with the auxiliary metal and high melting point carbide and the mixture is deprived of gases by heating in vacuum before pressing and finally sintering in a carbon furnace traversed by hydrogen. The metallic elements (including silicon) of the auxiliary carbides, or elementary boron, may be added instead of the carbides to the boron carbide, the elements becoming carburized during the process of sintering.ALSO:A sintered hard alloy for tools and implements consists of 75 per cent or more of boron carbide with one or more than one carbide of melting-point exceeding 2000 DEG C., for example carbide of silicon, vanadium, tungsten, molybdenum, titanium, hafnium, or zirconium, and a metal or metals of lower melting-point, particularly iron, nickel, cobalt, or chromium. Boron, obtained for example by the reduction of boron trioxide with magnesium and subsequent treatment with hydrochloric acid may first be carburized to correspond with the formula B6C by carbon or hydrocarbon in a carbon tube furnace traversed by hydrogen. The carbide is intimately mixed with the auxiliary metal and high melting-point carbide and the mixture is deprived of gases by heating in vacuum before pressing and finally sintering in a carbon furnace traversed by hydrogen. The metallic elements (including silicon) of the auxiliary carbides, or elementary boron, may be added instead of the carbides to the boron carbide, the elements becoming carburized during the process of sintering.
GB13139/31A 1930-07-31 1931-05-04 Improvements relating to sintered hard metallic alloys and methods for the manufacture thereof Expired GB378484A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE378484X 1930-07-31

Publications (1)

Publication Number Publication Date
GB378484A true GB378484A (en) 1932-08-04

Family

ID=6344558

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13139/31A Expired GB378484A (en) 1930-07-31 1931-05-04 Improvements relating to sintered hard metallic alloys and methods for the manufacture thereof

Country Status (1)

Country Link
GB (1) GB378484A (en)

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