Pore structure and gas permeability of high Nb-containing TiAl porous alloys by elemental powder metallurgy for microfiltration application

Fan Yang; Laiqi Zhang; Junpin Lin; Yongfeng Liang; Yuehui He; Shunli Shang; Zi Kui Liu

doi:10.1016/j.intermet.2012.07.022

Pore structure and gas permeability of high Nb-containing TiAl porous alloys by elemental powder metallurgy for microfiltration application

Fan Yang, Laiqi Zhang, Junpin Lin, Yongfeng Liang, Yuehui He, Shunli Shang, Zi Kui Liu

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

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Abstract

High Nb-containing TiAl porous and gradient porous alloys were synthesized by elemental powder metallurgy (EPM). The effects of powder size on pore structure and gas permeability were investigated. It is found that pores are interconnected and skeletons consist of typical γ- TiAl/α₂-Ti₃Al fully lamellar microstructure for Ti-48Al-6Nb porous alloys. With the fining of particle size of Ti, Al and Nb powders, the pore size and porosity of Ti-48Al-6Nb porous alloys decrease. Otherwise, the gas permeability increases almost linearly when the porosity increases from 17% to 52% and the pore size increases from 3.18 μm to 26.69 μm. A good agreement is shown between the simulations by capillary permeability model and the results of the actual gas permeability. In addition, gradient porous alloys were fabricated using different powder sizes by constrained sintering process, and a prediction of the relationship between permeability and coating thickness was discussed. Results from this study indicate the potential applications in microfiltration development by tailoring porosity of the coating.

Original language	English (US)
Pages (from-to)	2-7
Number of pages	6
Journal	Intermetallics
Volume	33
DOIs	https://doi.org/10.1016/j.intermet.2012.07.022
State	Published - Feb 2013

All Science Journal Classification (ASJC) codes

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

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10.1016/j.intermet.2012.07.022

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title = "Pore structure and gas permeability of high Nb-containing TiAl porous alloys by elemental powder metallurgy for microfiltration application",

abstract = "High Nb-containing TiAl porous and gradient porous alloys were synthesized by elemental powder metallurgy (EPM). The effects of powder size on pore structure and gas permeability were investigated. It is found that pores are interconnected and skeletons consist of typical γ- TiAl/α2-Ti3Al fully lamellar microstructure for Ti-48Al-6Nb porous alloys. With the fining of particle size of Ti, Al and Nb powders, the pore size and porosity of Ti-48Al-6Nb porous alloys decrease. Otherwise, the gas permeability increases almost linearly when the porosity increases from 17% to 52% and the pore size increases from 3.18 μm to 26.69 μm. A good agreement is shown between the simulations by capillary permeability model and the results of the actual gas permeability. In addition, gradient porous alloys were fabricated using different powder sizes by constrained sintering process, and a prediction of the relationship between permeability and coating thickness was discussed. Results from this study indicate the potential applications in microfiltration development by tailoring porosity of the coating.",

author = "Fan Yang and Laiqi Zhang and Junpin Lin and Yongfeng Liang and Yuehui He and Shunli Shang and Liu, {Zi Kui}",

note = "Funding Information: This work was financially supported by the Beijing Natural Science Foundation under contract No. 2122043 , the National Basic Research Program of China (973 Program) under contract No. 2011CB605500 and the State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing , under contract No. 2011Z-03 . SLS and ZKL are partially supported by the US National Science Foundation through grant DMR- 1006557.",

year = "2013",

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doi = "10.1016/j.intermet.2012.07.022",

language = "English (US)",

volume = "33",

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journal = "Intermetallics",

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T1 - Pore structure and gas permeability of high Nb-containing TiAl porous alloys by elemental powder metallurgy for microfiltration application

AU - Yang, Fan

AU - Zhang, Laiqi

AU - Lin, Junpin

AU - Liang, Yongfeng

AU - He, Yuehui

AU - Shang, Shunli

AU - Liu, Zi Kui

N1 - Funding Information: This work was financially supported by the Beijing Natural Science Foundation under contract No. 2122043 , the National Basic Research Program of China (973 Program) under contract No. 2011CB605500 and the State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing , under contract No. 2011Z-03 . SLS and ZKL are partially supported by the US National Science Foundation through grant DMR- 1006557.

PY - 2013/2

Y1 - 2013/2

N2 - High Nb-containing TiAl porous and gradient porous alloys were synthesized by elemental powder metallurgy (EPM). The effects of powder size on pore structure and gas permeability were investigated. It is found that pores are interconnected and skeletons consist of typical γ- TiAl/α2-Ti3Al fully lamellar microstructure for Ti-48Al-6Nb porous alloys. With the fining of particle size of Ti, Al and Nb powders, the pore size and porosity of Ti-48Al-6Nb porous alloys decrease. Otherwise, the gas permeability increases almost linearly when the porosity increases from 17% to 52% and the pore size increases from 3.18 μm to 26.69 μm. A good agreement is shown between the simulations by capillary permeability model and the results of the actual gas permeability. In addition, gradient porous alloys were fabricated using different powder sizes by constrained sintering process, and a prediction of the relationship between permeability and coating thickness was discussed. Results from this study indicate the potential applications in microfiltration development by tailoring porosity of the coating.

AB - High Nb-containing TiAl porous and gradient porous alloys were synthesized by elemental powder metallurgy (EPM). The effects of powder size on pore structure and gas permeability were investigated. It is found that pores are interconnected and skeletons consist of typical γ- TiAl/α2-Ti3Al fully lamellar microstructure for Ti-48Al-6Nb porous alloys. With the fining of particle size of Ti, Al and Nb powders, the pore size and porosity of Ti-48Al-6Nb porous alloys decrease. Otherwise, the gas permeability increases almost linearly when the porosity increases from 17% to 52% and the pore size increases from 3.18 μm to 26.69 μm. A good agreement is shown between the simulations by capillary permeability model and the results of the actual gas permeability. In addition, gradient porous alloys were fabricated using different powder sizes by constrained sintering process, and a prediction of the relationship between permeability and coating thickness was discussed. Results from this study indicate the potential applications in microfiltration development by tailoring porosity of the coating.

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Pore structure and gas permeability of high Nb-containing TiAl porous alloys by elemental powder metallurgy for microfiltration application

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