Evolution on phase composition and properties of alumina-based ceramics fabricated from high-titania special-grade natural bauxite micropowder

Riqing Du; Lvping Fu; Huazhi Gu; Siu Wing Or; Ao Huang; Renxiang Lv; Qiong Luo

doi:10.1016/j.ceramint.2021.05.177

Evolution on phase composition and properties of alumina-based ceramics fabricated from high-titania special-grade natural bauxite micropowder

Riqing Du, Lvping Fu, Huazhi Gu, Siu Wing Or, Ao Huang, Renxiang Lv, Qiong Luo

Research output: Journal article publication › Journal article › Academic research › peer-review

Abstract

In this study, Al₂O₃-based ceramics were fabricated with natural bauxite powder as the raw material. The phase compositions evolution behavior during the heat treatment and its influence on the properties of fabricated ceramics were investigated. With increasing heat treatment temperature, the sintering degree of high-titania special-grade bauxite became better. The samples showed decreased porosity, increased bulk density, Vickers hardness, fracture toughness and flexural strength. However, when the heat temperature increased to 1650 °C, decomposition of tieillite occurs in sample, leading to increased Al₂O₃ and TiO₂ content in the liquid phase. Corundum and mullite grains with anisotropic growth appeared in the samples, leading to a decrease in the density, the Vickers hardness and flexural strength of samples decreased consequently. However, those anisotropic grains could prolong the crack propagation path and improve the fracture toughness of the material.

Original language	English
Journal	Ceramics International
DOIs	https://doi.org/10.1016/j.ceramint.2021.05.177
Publication status	Accepted/In press - 2021

Keywords

AlO-Based ceramics
Natural bauxite
Phase compositions
Properties

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

More information

10.1016/j.ceramint.2021.05.177

Cite this

@article{b0b89aba573c4362a992754a264460e5,

title = "Evolution on phase composition and properties of alumina-based ceramics fabricated from high-titania special-grade natural bauxite micropowder",

abstract = "In this study, Al2O3-based ceramics were fabricated with natural bauxite powder as the raw material. The phase compositions evolution behavior during the heat treatment and its influence on the properties of fabricated ceramics were investigated. With increasing heat treatment temperature, the sintering degree of high-titania special-grade bauxite became better. The samples showed decreased porosity, increased bulk density, Vickers hardness, fracture toughness and flexural strength. However, when the heat temperature increased to 1650 °C, decomposition of tieillite occurs in sample, leading to increased Al2O3 and TiO2 content in the liquid phase. Corundum and mullite grains with anisotropic growth appeared in the samples, leading to a decrease in the density, the Vickers hardness and flexural strength of samples decreased consequently. However, those anisotropic grains could prolong the crack propagation path and improve the fracture toughness of the material.",

keywords = "AlO-Based ceramics, Natural bauxite, Phase compositions, Properties",

author = "Riqing Du and Lvping Fu and Huazhi Gu and Or, {Siu Wing} and Ao Huang and Renxiang Lv and Qiong Luo",

note = "Funding Information: The authors are thankful for the financially support from the National Natural Science Foundation of China (Grant No. 51802231 ), the Hong Kong Scholars Program (Grant No. XJ2020023 ), the China Postdoctoral Science Foundation (Grant No. 2017M622535 ) and the WUST National Defence Pre-research Foundation (Grant No. GF201905 ). Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd and Techna Group S.r.l.",

year = "2021",

doi = "10.1016/j.ceramint.2021.05.177",

language = "English",

journal = "Ceramics International",

issn = "0272-8842",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Evolution on phase composition and properties of alumina-based ceramics fabricated from high-titania special-grade natural bauxite micropowder

AU - Du, Riqing

AU - Fu, Lvping

AU - Gu, Huazhi

AU - Or, Siu Wing

AU - Huang, Ao

AU - Lv, Renxiang

AU - Luo, Qiong

N1 - Funding Information: The authors are thankful for the financially support from the National Natural Science Foundation of China (Grant No. 51802231 ), the Hong Kong Scholars Program (Grant No. XJ2020023 ), the China Postdoctoral Science Foundation (Grant No. 2017M622535 ) and the WUST National Defence Pre-research Foundation (Grant No. GF201905 ). Publisher Copyright: © 2021 Elsevier Ltd and Techna Group S.r.l.

PY - 2021

Y1 - 2021

N2 - In this study, Al2O3-based ceramics were fabricated with natural bauxite powder as the raw material. The phase compositions evolution behavior during the heat treatment and its influence on the properties of fabricated ceramics were investigated. With increasing heat treatment temperature, the sintering degree of high-titania special-grade bauxite became better. The samples showed decreased porosity, increased bulk density, Vickers hardness, fracture toughness and flexural strength. However, when the heat temperature increased to 1650 °C, decomposition of tieillite occurs in sample, leading to increased Al2O3 and TiO2 content in the liquid phase. Corundum and mullite grains with anisotropic growth appeared in the samples, leading to a decrease in the density, the Vickers hardness and flexural strength of samples decreased consequently. However, those anisotropic grains could prolong the crack propagation path and improve the fracture toughness of the material.

AB - In this study, Al2O3-based ceramics were fabricated with natural bauxite powder as the raw material. The phase compositions evolution behavior during the heat treatment and its influence on the properties of fabricated ceramics were investigated. With increasing heat treatment temperature, the sintering degree of high-titania special-grade bauxite became better. The samples showed decreased porosity, increased bulk density, Vickers hardness, fracture toughness and flexural strength. However, when the heat temperature increased to 1650 °C, decomposition of tieillite occurs in sample, leading to increased Al2O3 and TiO2 content in the liquid phase. Corundum and mullite grains with anisotropic growth appeared in the samples, leading to a decrease in the density, the Vickers hardness and flexural strength of samples decreased consequently. However, those anisotropic grains could prolong the crack propagation path and improve the fracture toughness of the material.

KW - AlO-Based ceramics

KW - Natural bauxite

KW - Phase compositions

KW - Properties

UR - http://www.scopus.com/inward/record.url?scp=85106879916&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2021.05.177

DO - 10.1016/j.ceramint.2021.05.177

M3 - Journal article

AN - SCOPUS:85106879916

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

ER -

Evolution on phase composition and properties of alumina-based ceramics fabricated from high-titania special-grade natural bauxite micropowder

Abstract

Keywords

ASJC Scopus subject areas

More information

Other files and links

Cite this