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使用廉价CaCO_3作为发泡剂,采用粉末压块熔炼工艺制备单胞间具有通道的半开孔泡沫铝。将铝和CaCO_3粉末混合物冷压缩成在空气气氛和一定温度下发泡的致密圆柱形前驱体。研究前驱体压缩压力、发泡剂含量、发泡温度和发泡时间对所得泡沫铝显微组织、线膨胀率、相对密度和压缩性能的影响。结果表明,所得泡沫铝的显微组织分布均匀,晶粒尺寸小于100μm,具有半开孔结构,相对密度为55.4%~84.4%%。随着压缩压力(127~318)的增大,当发泡剂含量为15%(质量分数)时,泡沫铝的线膨胀率、压缩强度和紧实应变增大。当发泡温度从800°C升高到1000°C时,除压缩强度和相对密度外,泡沫铝的其他参数都增大。研究结果表明,最佳发泡温度和发泡时间分别为900°C和10~25 min。
Using cheap CaCO_3 as a blowing agent, the semi-open cell aluminum foam with channels between the cells was prepared by powder compact melting process. Cold compression of the aluminum and CaCO 3 powder mixture into a dense cylindrical precursor foamed under air and at a certain temperature. The effects of precursor pressure, blowing agent content, foaming temperature and foaming time on the microstructure, linear expansion coefficient, relative density and compressibility of aluminum foam were investigated. The results show that the microstructure of the obtained aluminum foam is evenly distributed with a grain size of less than 100 μm and a semi-open pore structure with a relative density of 55.4% -84.4 %%. With the increase of compression pressure (127 ~ 318), the linear expansion coefficient, compressive strength and firm strain of aluminum foam increase when the content of foaming agent is 15% (mass fraction). When the foaming temperature is raised from 800 ° C to 1000 ° C, the compressive strength and relative density of the foam aluminum increase. The results show that the optimum foaming temperature and foaming time are 900 ° C and 10 ~ 25 min respectively.