亜鉛フォームへのビステトラゾール系発泡剤の適用性

概要

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In the powder metallurgical process to produce foamed cellular zinc, applicability of two organic foaming agents, usually used for resin, bistetorazole-piperazine (BTP) and bistetorazole-sodium (BTS), have been investigated in order to utilize their excellent porosity forming ability in manufacturing of metal foams. In the differential thermal analysis, both BTP and BTS showed sharp degradation characteristics with exothermic reaction at 608 K and 725 K, respectively. In Zn-BTP, in which the decomposition of BTP occurred rapidly at temperatures below the melting point of the zinc matrix, cracks often were observed in the surfaces of the samples. Therefore, it was not possible to keep the gas in the matrix, and the porosity did not reach 40%. On the other hand, successfully expanded foams with a porosity over 55% were obtained in Zn-BTS, in which the decomposition of BTS occurred at temperatures higher than the melting point of the matrix. The cellular structures consisted of small pores of about 300 μm or less in sizes, and the applicability of BTS to the manufacturing of zinc foams was verified.
2005-03-15