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Preparation of porous Al2TiO5 ceramics reinforced by in situ formation of mullite whiskers
Highlights ► Al2TiO5 porous ceramics reinforced by in situ mullite whiskers were fabricated. ► Apparent porosity is about 45–52%, and the compressive strength is above 11MPa. ► The in situ synthesized whiskers formed interlocking structure in the pores. ► The special structure is beneficial to improve strength and specific surface area.
Abstract Due to the low thermal expansion coefficient and high temperature resistance, porous Al2TiO5 ceramic is a promising candidate for use in high-temperature gas purifier, diesel tail gas processor and catalyst support. In this paper, Al2TiO5-based porous ceramics reinforced by in situ formation of mullite whiskers were fabricated by reaction sintering method using γ-AlOOH, TiO2, SiO2 and AlF3 as raw materials, Fe2O3 as modifying agent, respectively. Results show that apparent porosity of the composite porous ceramics is increased from 33.3% to 45–52% when the raw materials for mullite were added, and the compressive strength of the porous ceramic is above 11MPa. The in situ synthesized mullite whiskers, with the size of 0.5–0.6μm in diameter and 6–8μm in length, formed interlocking structure in the pores of Al2TiO5-based porous ceramics, which is beneficial to improve the strength and increase the specific surface area of the porous ceramics.
Preparation of porous Al2TiO5 ceramics reinforced by in situ formation of mullite whiskers
Highlights ► Al2TiO5 porous ceramics reinforced by in situ mullite whiskers were fabricated. ► Apparent porosity is about 45–52%, and the compressive strength is above 11MPa. ► The in situ synthesized whiskers formed interlocking structure in the pores. ► The special structure is beneficial to improve strength and specific surface area.
Abstract Due to the low thermal expansion coefficient and high temperature resistance, porous Al2TiO5 ceramic is a promising candidate for use in high-temperature gas purifier, diesel tail gas processor and catalyst support. In this paper, Al2TiO5-based porous ceramics reinforced by in situ formation of mullite whiskers were fabricated by reaction sintering method using γ-AlOOH, TiO2, SiO2 and AlF3 as raw materials, Fe2O3 as modifying agent, respectively. Results show that apparent porosity of the composite porous ceramics is increased from 33.3% to 45–52% when the raw materials for mullite were added, and the compressive strength of the porous ceramic is above 11MPa. The in situ synthesized mullite whiskers, with the size of 0.5–0.6μm in diameter and 6–8μm in length, formed interlocking structure in the pores of Al2TiO5-based porous ceramics, which is beneficial to improve the strength and increase the specific surface area of the porous ceramics.
Preparation of porous Al2TiO5 ceramics reinforced by in situ formation of mullite whiskers
Xu, Guogang (author) / Ma, Yinghua (author) / Ruan, Guozhi (author) / Cui, Hongzhi (author) / Zhang, Zhihui (author) / Bai, Bin (author)
2012-12-12
4 pages
Article (Journal)
Electronic Resource
English
Preparation of porous Al2TiO5 ceramics reinforced by in situ formation of mullite whiskers
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