MATERTRANS : Vol. 49 (2008) , No. 11 pp.2670-2672

An Effect of Addition of NiO Powder on Pore Formation in Lotus-Type Porous Nickel

H. Onishi¹⁾, S. Ueno¹⁾ and H. Nakajima¹⁾

1) The Institute of Scientific and Industrial Research, Osaka University

(Received April 30, 2008)
(Accepted July 29, 2008)

Lotus-type porous nickel with cylindrical pores was fabricated by unidirectional solidification in a mixture gas of hydrogen and argon. The pore size is significantly affected by the addition of NiO powder. The pore size decreases and the number density of the pores increases by the addition of NiO. It is concluded that NiO powder can serve as nucleation sites for the pore formation in the process of the solidification.

Keywords:

lotus-type porous nickel, unidirectional solidification, nucleation site, NiO powder