Nanocarbon-dependent synthesis of ZrB2 in a binary ZrO 2 and boron system

Ruixing Li; Haijie Lou; Shu Yin; Yun Zhang; Yanshan Jiang; Bin Zhao; Junping Li; Zhihai Feng; Tsugio Sato

doi:10.1016/j.jallcom.2011.06.028

Nanocarbon-dependent synthesis of ZrB₂ in a binary ZrO ₂ and boron system

Ruixing Li, Haijie Lou, Shu Yin, Yun Zhang, Yanshan Jiang, Bin Zhao, Junping Li, Zhihai Feng, Tsugio Sato

Center for Exploration of New Inorganic Materials

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

15 Citations (Scopus)

Abstract

Thermodynamically, ZrO₂ may react with boron to form B ₂O₃/B₂O₂ and ZrB₂ at room temperature. However, this reaction is incomplete at temperatures lower than 1550 °C, even with the use of metastable reactants, i.e., as-synthesized amorphous hydrous nano-ZrO₂ and amorphous boron powders. In this study, a complete disintegration of ZrO₂ was achieved by introducing nanocarbon to the binary system of ZrO₂ and boron at 1550 °C. The metastable reactants affected the temperature required for the solid-state reactions and also strongly affected the kinetics of the transformation. Single crystal and plate-like ZrB₂ particles with a uniform distribution and a size of ca. 1.0 μm in two-dimensions were obtained using 5 wt.% nanocarbon and a B/Zr molar ratio of 4.

Original language	English
Pages (from-to)	8581-8583
Number of pages	3
Journal	Journal of Alloys and Compounds
Volume	509
Issue number	34
DOIs	https://doi.org/10.1016/j.jallcom.2011.06.028
Publication status	Published - 2011 Aug 25

Keywords

Amorphous materials
Ceramics
Nanoparticles
Nanosize
Powder technology

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Nanocarbon-dependent synthesis of ZrB2 in a binary ZrO 2 and boron system",

abstract = "Thermodynamically, ZrO2 may react with boron to form B 2O3/B2O2 and ZrB2 at room temperature. However, this reaction is incomplete at temperatures lower than 1550 °C, even with the use of metastable reactants, i.e., as-synthesized amorphous hydrous nano-ZrO2 and amorphous boron powders. In this study, a complete disintegration of ZrO2 was achieved by introducing nanocarbon to the binary system of ZrO2 and boron at 1550 °C. The metastable reactants affected the temperature required for the solid-state reactions and also strongly affected the kinetics of the transformation. Single crystal and plate-like ZrB2 particles with a uniform distribution and a size of ca. 1.0 μm in two-dimensions were obtained using 5 wt.% nanocarbon and a B/Zr molar ratio of 4.",

keywords = "Amorphous materials, Ceramics, Nanoparticles, Nanosize, Powder technology",

author = "Ruixing Li and Haijie Lou and Shu Yin and Yun Zhang and Yanshan Jiang and Bin Zhao and Junping Li and Zhihai Feng and Tsugio Sato",

year = "2011",

month = aug,

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doi = "10.1016/j.jallcom.2011.06.028",

language = "English",

volume = "509",

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AU - Li, Ruixing

AU - Lou, Haijie

AU - Yin, Shu

AU - Zhang, Yun

AU - Jiang, Yanshan

AU - Zhao, Bin

AU - Li, Junping

AU - Feng, Zhihai

AU - Sato, Tsugio

PY - 2011/8/25

Y1 - 2011/8/25

N2 - Thermodynamically, ZrO2 may react with boron to form B 2O3/B2O2 and ZrB2 at room temperature. However, this reaction is incomplete at temperatures lower than 1550 °C, even with the use of metastable reactants, i.e., as-synthesized amorphous hydrous nano-ZrO2 and amorphous boron powders. In this study, a complete disintegration of ZrO2 was achieved by introducing nanocarbon to the binary system of ZrO2 and boron at 1550 °C. The metastable reactants affected the temperature required for the solid-state reactions and also strongly affected the kinetics of the transformation. Single crystal and plate-like ZrB2 particles with a uniform distribution and a size of ca. 1.0 μm in two-dimensions were obtained using 5 wt.% nanocarbon and a B/Zr molar ratio of 4.

AB - Thermodynamically, ZrO2 may react with boron to form B 2O3/B2O2 and ZrB2 at room temperature. However, this reaction is incomplete at temperatures lower than 1550 °C, even with the use of metastable reactants, i.e., as-synthesized amorphous hydrous nano-ZrO2 and amorphous boron powders. In this study, a complete disintegration of ZrO2 was achieved by introducing nanocarbon to the binary system of ZrO2 and boron at 1550 °C. The metastable reactants affected the temperature required for the solid-state reactions and also strongly affected the kinetics of the transformation. Single crystal and plate-like ZrB2 particles with a uniform distribution and a size of ca. 1.0 μm in two-dimensions were obtained using 5 wt.% nanocarbon and a B/Zr molar ratio of 4.

KW - Amorphous materials

KW - Ceramics

KW - Nanoparticles

KW - Nanosize

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