GB778267A - Improvements in or relating to a process for producing pure carbides of the metals tungsten, chromium and molybdenum - Google Patents

Improvements in or relating to a process for producing pure carbides of the metals tungsten, chromium and molybdenum

Info

Publication number
GB778267A
GB778267A GB15375/55A GB1537555A GB778267A GB 778267 A GB778267 A GB 778267A GB 15375/55 A GB15375/55 A GB 15375/55A GB 1537555 A GB1537555 A GB 1537555A GB 778267 A GB778267 A GB 778267A
Authority
GB
United Kingdom
Prior art keywords
hydrocarbons
carbon
methane
hydrogen
hydrocarbon
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
GB15375/55A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB778267A publication Critical patent/GB778267A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/90—Carbides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

Tungsten chromium or molybdenum carbide substantially free from uncombined carbon, is produced by heating of the metal or decomposable compound of the metal in a mixture of a hydrocarbon and hydrogen, sufficient hydrogen being present to prevent decomposition of the hydrocarbons and deposition of carbon. The maximum ratio of hydrocarbon to hydrogen permissible is calculated by assuming that in the case of hydrocarbons other than methane, decomposition and recombination to form methane takes place and by ignoring the additional hydrogen required for such conversion. The maximum percentage of methane permissible at 800 DEG C. is ca. 8 per cent. Carbides specified are W2C, WC, Cr3C2 and Mo2C. The carbides are reckoned to be pure if the analysis shows less than 0.05 per cent. carbon. Elements other than carbon may be present. Metal compounds which may be used as WO3, MoO3, Cr2O3; H2WO4, H2MO4, H2CrO4; Am2WO4, Am2 CrO4, Am2MO4. Hydrocarbons specified are methane, ethane, propene, propane, butenes, butanes, heptanes and benzene. Hydrocarbons which are gaseous at room temperature are preferred. The temperature preferably exceeds 950 DEG C. The product is preferably rapidly cooled. Alternatively the percentage of hydrocarbon in the gaseous mixture may be increased as the temperature is lowered.
GB15375/55A 1954-06-01 1955-05-27 Improvements in or relating to a process for producing pure carbides of the metals tungsten, chromium and molybdenum Expired GB778267A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US778267XA 1954-06-01 1954-06-01

Publications (1)

Publication Number Publication Date
GB778267A true GB778267A (en) 1957-07-03

Family

ID=22140270

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15375/55A Expired GB778267A (en) 1954-06-01 1955-05-27 Improvements in or relating to a process for producing pure carbides of the metals tungsten, chromium and molybdenum

Country Status (1)

Country Link
GB (1) GB778267A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077385A (en) * 1959-01-06 1963-02-12 Gen Electric Process for producing carbides
US3334967A (en) * 1965-09-09 1967-08-08 Union Carbide Corp Process of preparing boron carbide from boron halide and a hydrocarbon
US3380839A (en) * 1964-01-21 1968-04-30 Pechiney Prod Chimiques Sa Solid solutions of fine grain metallic carbides and method
US3399980A (en) * 1965-12-28 1968-09-03 Union Carbide Corp Metallic carbides and a process of producing the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077385A (en) * 1959-01-06 1963-02-12 Gen Electric Process for producing carbides
US3380839A (en) * 1964-01-21 1968-04-30 Pechiney Prod Chimiques Sa Solid solutions of fine grain metallic carbides and method
US3334967A (en) * 1965-09-09 1967-08-08 Union Carbide Corp Process of preparing boron carbide from boron halide and a hydrocarbon
US3399980A (en) * 1965-12-28 1968-09-03 Union Carbide Corp Metallic carbides and a process of producing the same

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