发泡参数对粉末冶金制备泡沫铝显微组织和压缩性能的影响（英文）

发布时间：2018-03-05 23:16

本文选题：泡沫铝　切入点：粉末冶金　出处：《Transactions of Nonferrous Metals Society of China》2017年07期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Using cheap CaCO_3 as foaming agent, A semi-porous aluminum foam with a channel between monocytes was prepared by powder pressing melting. The mixture of aluminum and CaCO_3 powder was cold compressed into a dense cylindrical precursor foamed in air atmosphere and at a certain temperature. The compression pressure of the precursor was studied. The effects of foaming agent content, foaming temperature and foaming time on the microstructure, linear expansion ratio, relative density and compressive properties of the aluminum foams were investigated. The grain size is less than 100 渭 m, with a semi-porous structure, a relative density of 55.4% and a relative density of 84.4%. With the increase of the compression pressure, the linear expansion rate of aluminum foams increases when the foaming agent content is 15 渭 m (mass fraction). When the foaming temperature increases from 800 掳C to 1000 掳C, the other parameters of aluminum foam increase except compression strength and relative density. The results show that the optimum foaming temperature and foaming time are 900 掳C and 1025 min, respectively.
【作者单位】： Department
【分类号】：TB383.4;TF125.22

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