Preparation of nitrides from 1

1 type clay minerals by carbothermal reduction

Yoshiyuki Sugahara, Jyunji Miyamoto, Kazuyuki Kuroda, Chuzo Kato

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    In order to investigate the possibility of the use of 1:1 type clay minerals as raw materials for nitride production, kaolinite and antigorite were converted into nitrides by carbothermal reduction. Kaolinite or antigorite was mixed with carbon in two separate experiments. The resulting mixture was heated in N2. Kaolinite was converted into β'-sialon and AIN. Kaolinite was initially transformed into cristobalite and mullite, which were then reduced. In addition to the nitrides, SiC and α-Al2O3 also formed as the reactions proceeded. Essentially, both the SiO2 and Al2O3 components were converted into nitrides and oxynitrides by carbothermal reduction. From the antigorite-carbon mixture, α- and β-Si3N4 were obtained. Forsterite initially crystallized and was reduced. Additionally, MgSiN2 and MgO formed during the conversion. α-Fe and FexSi were also detected. MgSiN2 seemed to act as an intermediate for Si3N4 formation. Therefore, all the Mg-containing phases can not be present as nitrides finally; magnesium was lost as the reactions proceeded.

    Original languageEnglish
    Pages (from-to)11-26
    Number of pages16
    JournalApplied Clay Science
    Volume4
    Issue number1
    DOIs
    Publication statusPublished - 1989

    Fingerprint

    Carbothermal reduction
    Kaolin
    Clay minerals
    antigorite
    Nitrides
    kaolinite
    clay mineral
    Serpentine Asbestos
    porcellanite
    cristobalite
    Carbon
    forsterite
    carbon
    magnesium
    Silicon Dioxide
    Magnesium
    Raw materials
    experiment
    Experiments

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geology

    Cite this

    Preparation of nitrides from 1 : 1 type clay minerals by carbothermal reduction. / Sugahara, Yoshiyuki; Miyamoto, Jyunji; Kuroda, Kazuyuki; Kato, Chuzo.

    In: Applied Clay Science, Vol. 4, No. 1, 1989, p. 11-26.

    Research output: Contribution to journalArticle

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