粉末冶金法制备泡沫铝材料

研究了粉末冶金法制备泡沫铝材料的方法·讨论了发泡过程中的保护方式、制坯压力、发泡温度等参数对泡沫铝体积质量、孔隙率、孔结构的影响,并对发泡机理进行了探讨·增大制坯压力使得金属坯致密,可以得到孔结构均匀的泡沫铝材料;发泡温度是影响发泡的主要因素之一,发泡温度控制在高于铝或铝合金熔点,同时保持熔体具有一定粘度的范围内,能够得到孔结构均匀、高孔隙率的泡沫铝材料·实验结果表明:采用熔盐保护方式,在300MPa的压力下,温度在675～680℃时,可得到孔径均匀、孔隙率高的泡沫铝材料·

Preparation of Foam Aluminium by Powder Metallurgy Process

The effects of some parameters as air-separating protection, blank compaction and forming temperature on the compactedness, porosity and pore morphology of foam Aluminum were discussed in detail, especially the mechanism of foaming process. It was found that increasing pressure for blank can improve the compactedness of blanks so as to make foam aluminium materials with homogeneous pores. Foaming temperature, as one of the main influencing factors on foaming process, should be controlled higher than the melting point of Al or Al-alloy to a certain extant in order to keep a reasonable viscosity. Thus, the foam aluminum with homogeneous pores and high porosity is available. As shown by experiments, such materials should be made on conditions that they shall be protected with molten salt under 300 MPa pressure at 675-680°C.