矩形断面铜包铝复合材料的水平连铸直接复合成形  

Copper cladding aluminum composite materials with rectangle section fabricated by horizontal core-filling continuous casting

作　　者：吴永福[1] 刘新华[1] 谢建新[1] 王连忠 董晓文 

机构地区：[1]北京科技大学材料先进制备技术教育部重点实验室,北京100083 [2]烟台孚信达双金属股份有限公司,烟台264118

出　　处：《中国有色金属学报》2012年第9期2500-2507,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2009AA03Z532)

摘　　要：制备断面尺寸为50mm×30mm、铜包覆层厚度为3mm的矩形断面铜包铝复合材料，研究结晶器长度、拉坯速度、芯管长度和一次冷却水流量对矩形断面铜包铝复合材料水平连铸直接复合成形过程的影响。结果表明：当连铸结晶器长度为150mm、芯管长度为125mm时，较为合理的拉坯速度范围为75-90mm／min；当拉坯速度过慢时，铝液的填充不连续，导致芯部铝的收缩或冷隔等缺陷；当拉坯速度过快时，铜铝界面反应严重；当拉坯速度为75mm／min时，合理的一次冷却水流量为700L／h，一次冷却水流量大于1000L／h导致铝液填充不连续，一次冷却水流量小于400L／h则导致铜铝界面反应加剧。通过检测芯管出口位置处的石墨内衬温度变化可有效监控铝液的填充行为以及连铸过程的稳定性。Copper cladding aluminum （CCA） composite materials with the section dimensions of 50 mm X 30 mm and the sheath thickness of 3 mm were fabricated by horizontal core-filling continuous casting （HCFC） technology. The effects of the crystallizer length, withdrawing speed, mandrel tube length and flux of the primary cooling water were studied. The results show that when the crystallizer length is 150 mm and the mandrel tube length is 125 mm, the rational withdrawing speed is 75-90 mm/min. Too low withdrawing speed leads to the discontinuous filling process of liquid aluminum, which causes shrinkage or cold shuts. Conversely, too high withdrawing speed results in serious interface reaction between copper and aluminum. At the withdrawing speed of 75 mm/min, the rational primary cooling water is 700 L/h. The flux of primary cooling water above I 000 LPa leads to the discontinuous filling process of the liquid aluminum, but the flux of primary cooling water below 400 L/h leads to severe interface reaction. The filling behavior of the liquid aluminum and the stability of the continuous casting can be controlled by monitoring the temperature variation of the graphite mould at the position corresponding to the outset of the mandrel tube.

关 键 词：铜包铝 复合材料 矩形断面 水平连铸 

分 类 号：TG249.7[金属学及工艺—铸造]