POROUS BODY OF ALUMINUM OR ITS ALLOY AND A MANUFACTURING METHOD THEREOF

摘要

A porous sintered material of good premeability and effective sound absorbability, being formed by combining openings of particles of aluminum or aluminum alloy powder into a body by means of sintering and having connecting pores among the particles of said aluminum or aluminum alloy powder. Said porous sintered material is obtained by mixing aluminum or an aluminum alloy with a low melting point aluminum alloy, forming the mixture in a predetermined shape and sintering it at a tempature which is at least 10.degree.C lower than the melting point of the base material and higher than that of the low melting point material. The resulting material is useful as a sound absorbing component for high speed railway cars.