Aluminum Hollow Sphere Processing
Aluminum Hollow Sphere Processing
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铝空心球加工
DOI：
10.4028/www.scientific.net/msf.331-337.495
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Cochran
中科院分区：
文献类型：
--
作者：
Jason H. Nadler;T. Sanders;J. Cochran
一种新工艺已被开发出来，可以直接从熔体中形成空心铝合金球。这些球体是密封的并且具有相对恒定的壁厚和直径。球体通过一对同轴喷嘴形成。内部射流维持惰性气体流，而内部射流和外部射流之间形成的环带携带熔融金属流。中空液态金属射流中的轴对称不稳定性会导致气泡被夹断，当气泡落入受流量控制的惰性气氛时，气泡就会凝固。研究了纯铝、共晶铝硅和铝-2%钙作为球体生产材料。 Al-2%Ca 最有希望，至少部分是由于氧化物颗粒的存在。氧化物颗粒促进球体稳定性并提高凝固速率。
A new process has been developed to form hollow aluminum alloy spheres directly from the melt. These spheres are hermetic and have a relatively constant wall thickness and diameter. Spheres are formed through a pair of coaxial nozzles. The inner jet sustains a flow of inert gas while the annulus formed between the inner and outer jets carries a stream of molten metal. Axisymmetric instabilities in the hollow liquid metal jet result in pinched off bubbles that solidify as they fall through a flow controlled, inert atmosphere. Pure aluminum, eutectic aluminum-silicon, and aluminum-2% calcium were investigated as sphere producing materials. Al-2%Ca showed the most promise, due at least in part to the presence of oxide particles. Oxide particles promoted sphere stability and increased solidification rates.