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Marcos Paulo Ribeiro (marcos@usipe.com.br) e Osvaldo da Silva Neto (osvaldo@usipe.com.br) são mestrandos em Eng. Minas, Metalurgia e
de Materiais - UFRGS, Porto Alegre (RS); e Alexandre Rocha é diretor do Centro de Tecnologia - UFRGS, (alexandre.rocha@ufrgs.br).

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