闭孔泡沫铝与铝及铝合金覆板的冶金结合

Metallurgy Bonding of Closed-Cell Aluminum Foam with Aluminum and Aluminum Alloy Plate

利用直接冶金结合方法,研究了铝及铝合金覆板的厚度及复合温度与时间对闭孔泡沫铝夹心三明治与覆板结合层厚度的影响.利用金相显微镜观察了泡沫铝夹心与覆板结合界面的微观组织,并测量了结合界面的扩散层厚度和显微硬度.研究结果表明,铝熔体与纯铝和铝合金覆板复合温度越高,复合时间越长,他们之间的扩散层厚度越大;当纯铝板的预热温度为400~450℃,复合速度为53.9~74.4 mm/min时,泡沫铝夹芯与纯铝板形成良好冶金结合,复合界面的互扩散层厚度为39~44μm;当铝合金覆板的预热温度为240℃,复合速度为58.3 mm/min时,制备铝合金覆板泡沫铝三明治所需的铝合金板最小厚度应为7.9 mm.

Using direct metallurgy bonding technology, the effect of aluminum and aluminum alloy plate thick- ness, bonding temperature and time on the diffusion layer thickness between the plates and aluminum foam were studied. The interface microstructures of the aluminum foam sandwich was observed, and the diffusion layer thickness and micro-hardness were measured. Experiment results show that the diffusion layer thickness between aluminum meh and pure aluminum and aluminum alloy plates is increased with increasing bonding temperature and time. At preheating temperature range of 400 and 450℃ and bonding speed between 53.9 and 74.4 mm/min, the aluminum foam core and pure aluminum plate are well combined metallurgically with the diffusion layer thickness between 39 and 44 m. When the aluminum alloy plate is preheated at 240℃with a speed of 58.3 mm/min, a minimum thickness of 7.9 mm is needed for the aluminum alloy plate.