Synthesis and thermal stability of nanocrystalline chromium disilicide

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

doi:10.1016/j.jallcom.2003.12.015

Synthesis and thermal stability of nanocrystalline chromium disilicide

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

Research output: Contribution to journal › Article › peer-review

29 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 language	English
Pages (from-to)	176-179
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	376
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2003.12.015
Publication status	Published - 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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title = "Synthesis and thermal stability of nanocrystalline chromium disilicide",

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.",

keywords = "Chemical synthesis, Chromium disilicide, Nanostructures, Thermal property, X-ray diffraction",

author = "Jianhua Ma and Yunle Gu and Liang Shi and Luyang Chen and Zeheng Yang and Yitai Qian",

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T1 - Synthesis and thermal stability of nanocrystalline chromium disilicide

AU - Ma, Jianhua

AU - Gu, Yunle

AU - Shi, Liang

AU - Chen, Luyang

AU - Yang, Zeheng

AU - Qian, Yitai

PY - 2004/8/11

Y1 - 2004/8/11

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AB - 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.

KW - Chemical synthesis

KW - Chromium disilicide

KW - Nanostructures

KW - Thermal property

KW - X-ray diffraction

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