METHOD FOR PRODUCING POROUS SEMIPRODUCTS FROM ALUMINIUM ALLOYS POWDER

摘要

The invention relates to powder metallurgy and can be used for producing porous materials having high thermal and sound insulation and energy absorption combined with light mass, incombustibility and the ecological cleanness thereof. According to said invention, during mixing a powder of an aluminium alloy with porophores, the powders of aluminium oxide and aluminiu m hydroxide ranging from 1 to 10 % and crushed particles of secondary aluminiu m alloys of the dimensions ranging from 0.5 to 4.5 mm are added to the powder mixture. The particles are mixed in an atrittor until a mechanically alloyed powder alloy is obtained. The powder mixture being heated, it is poured in a vertical container which vibrocompacts the mixture and maintains the temperature thereof. Afterwards, said mixture is transferred to the rectangular groove of a rolling mill in order to carry out a continuous hot compaction in a dead groove of horizontal rollers at a temperature ranging from 430 to 500 ~C according to the following condition: H = h x .gamma. x .alpha., where H is an opening between rollers along the arc of contact in m m, h is the thickness of the produced sheet, .gamma. is a compaction ratio of t he powder, .alpha. is an experimental ratio equal to 1.5>=.alpha.>=4.5. S aid invention reduces production cost byusing aluminium alloy refuses, expanding the range of sheets and plates and increases the efficiency of the productio n thereof.