Synthesis and thermal stability of nanocrystalline chromium disilicide

Jianhua Ma, Yunle Gu, Liang Shi, Luyang Chen, Zeheng Yang, Yitai Qian

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    Nanocrystalline chromium disilicide was synthesized by co-reducing anhydrous chromium trichloride and sodium fluorosilicate with metallic potassium at 650 °C in an autoclave. X-ray powder diffraction pattern indicated that the product was hexagonal CrSi2. Transmission electron microscope images showed that the sample consisted of particles with the diameters of 20-50 nm and an average diameter of about 35 nm. TGA and DTA indicated that the oxidation of CrSi2 began to proceed at 700 °C in air, and only about 8.6wt.% of the sample was oxidized in the surfaces of the particles below 1000 °C. It had high thermal oxidation stability due to the formed protective layer.

    Original languageEnglish
    Pages (from-to)176-179
    Number of pages4
    JournalJournal of Alloys and Compounds
    Volume376
    Issue number1-2
    DOIs
    Publication statusPublished - 2004 Aug 11

    Keywords

    • Chemical synthesis
    • Chromium disilicide
    • Nanostructures
    • Thermal property
    • X-ray diffraction

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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