Evaluation of Porosity in Lotus--Type Porous Cu Fabricated with Gasar Process

Acta Metall Sin

2006, Vol. 42

Issue (11): 1165-1170 DOI:

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Evaluation of Porosity in Lotus--Type Porous Cu Fabricated with Gasar Process

ZHANG Huawei; LI Yanxiang; LIU Yuan

Key Laboratory for Advanced Materials Processing Technology; Ministry of Education; Department of Mechanical Engineering; Tsinghua University; Beijing; 100084

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ZHANG Huawei; LI Yanxiang; LIU Yuan. Evaluation of Porosity in Lotus--Type Porous Cu Fabricated with Gasar Process. Acta Metall Sin, 2006, 42(11): 1165-1170 .

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Abstract Lotus-type porous copper with elongated pores has been fabricated by a unidirectional solidification method under a pressurized hydrogen or gas mixture of hydrogen and argon. Through solving the steady-state solute distribution function before the solidification front, the hydrogen content in the solid metal was calculated and a new theoretical model for calculating porosity was founded. Solidification velocity and the diffusivity of hydrogen were taken into account and the predicted porosity values are in good agreement with the experimental results under different partial pressures of hydrogen and argon. In addition, the relationship between porosity and partial pressures of mixed gases was obtained.

Key words: Gasar unidirectional solidification porous metal lotus-type structure porosity

Received: 28 March 2006

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I11/1165

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