In this work, a metallic composite was obtained by using aluminum powder as matrix and industrialized alumino-silicate fibers or mineral silica fibers as reinforcement. Techniques of powder metallurgy were used with cold uniaxial pressing and hot extrusion. The samples obtained in both processes were heat treated at 600°C to promote a reaction between the silica present into fibers composition and the aluminum matrix. A co-continuous microstructure was obtained on the fibers surface as a result of this reaction by the transformation of its original composition in an interconnected layer of Al2O3 and Al-Si alloy. This procedure promoved a strong interfatial bonding between the fibers and the matrix and in the case of hot extruded samples, the ultimate tensile strength was higher than that for similar composites obtained by the use of SiC of NbC as reinforcement.189-191 529534Feest, E.A., Tweed, J.H., (1991) Powder Metallurgy - An Overview, pp. 267-286. , The Institute of Metals Series on Powder Metallurgy. Section 5, 18, Powder Metallurgy CompositesMourisco, A.J., Ambrósio, F.F., Consolidação de pós de al/SiC por extrusão (1991) Metalurgia do Pó, pp. 381-398. , São Paulo, Anais... São Paulo, ABM, (1991)Rajan, T.P.D., Pillai, R.M., Pai, B.C., Review - Reinforcement coatings and interfaces in aluminium metal matrix composites (1998) Journal of Materials Science, 33, pp. 3491-3503Breslin, M.C., Process for preparing ceramic-metal composite bodies. US Patent 5,214,011, (1993)Breslin, M.C., Ringnalda, J., Xu, L., Fuller, M., Seeger, J., Daehn, G.S., Otani, T., Fraser, H.L., Processing, microstructure, and properties of co-continuous alumina-aluminum composites (1995) Materials Science and Engineering, A195, pp. 113-119Liu, W., Koster, U., Microstructures and properties of interpenetrating alumina/aluminium composites made by reaction of SiO2 glass preforms with molten aluminium (1996) Materials Science and Engineering, A210, pp. 1-7Daehn, G.S., Starck, B., Xu, L., Elfishawy, K.F., Ringnalda, J., Fraser, H.L., Elastic and plastic behaviour of a co-continuous alumina/aluminum composite (1996) Acta Materialia, 44 (1), pp. 249-261Yoshikawa, N., Watanabe, Y., Velloza, Z.M., Taniguchi, S., Kikuchi, A., Mechanical properties of Al/Al2O3 composites fabricated by reaction between SiO2 and molten Al, Al-Cu (1997) Journal of Materials Science Letters, 16, pp. 1547-1550Gregolin, E.N., Pré-formas cerâmicas para utilização em compósitos de matriz metálica (1995) Dissertação de Mestrado, , Universidade Estadual de CampinasBar, J., Gudladt, H.J., Illy, J., Lendvai, J., Influence of fibre reinforcement on the aging behaviour of na AlSi12CuMgNi alloy (1998) Materials Science and Engineering, A248, pp. 181-186Durant, Y., Short ceramic reinforcing fibres (1987) British Ceramic Review, 72, p. 41Machado, J.A.M., Brandão, P.R.G., Caracterização mineralógica de minério espongilítico da região de João Pinheiro, MG (1998) IX Simpósio Mínero-Metalúrgico da UFMG, , Anais..., 24 páginasMourisco, A.J., Preparação e caracterização de compósito de matriz de alumínio 1100 com partículas de SiC por metalurgia do pó (1995) Dissertação de Mestrado, , IPENSerra, J.C.V., Caracterização mecânico-metalúrgica de compósitos Al-NbC produzidos por metalurgia do pó (1998) Dissertação de Mestrado, , Universidade Estadual de CampinasYoshimura, H.N., Produção e caracterização de compósitos de matriz de Al reforçada com partículas de SiC obtidos por extrusão de pós (1994) Dissertação de Mestrado, , EPUSP