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COB372 - Influência da Adição de Silício na Qualidade Superficial de Um Pistão de Alumínio fundido/ Adition of silicon influence of superficial quality on piston of the aluminum casting

Celso Riyoitsi Sokei *, Elaine Alves Pedrosa *, Helder Augustus Trevisso da Silva **

*Depto. Eng. Mecânica-FEIS/Unesp Ilha Solteira-SP-Brasil E-mail: Celso@dem.feis.unesp.br

**Depto. Eng. Mecânica-EESCUSP-São Carlos-SP- Brasil

Abstract

In the casting process of metal and alloys, the main objective is to produce good quality pieces, i.e. without defects. If they are present, it is absolutely necessary to eliminate or minimize them, or else the piece quality and strength may be seriously impaired. One of the most commonly found defects occurring during the casting process of metals is the shrinkage, i.e. the contraction of the piece. In the case of aluminum alloys, it has been proved that shrinkage can be minimized either by changing the alloy composition with silicon addition or altering the mould design. In the present work, shrinkage suppression obtained by experimentally varying the silicon addition in aluminum alloy is presented. Also, the minimum percentage of silicon is determined, in order to maintain good ductility and mechanical strength. Such results compare well with the literature.

Keywords

Fundição, Ligas de Alumínio, Defeitos, Pistões/Casting, Aluminum Alloys, Defects, Pistons.

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