High-elongation rate aluminum alloy material for cable and preparation method thereof

Abstract

A high-elongation rate aluminum alloy material and preparation method thereof. The high-elongation aluminum alloy material contains, in weight percentage, 0.30-1.20% of iron, 0.03-0.10% of silicon, 0.01-0.30% of rare earth elements, namely cerium and lanthanum, and the remaining aluminum and inevitable impurities. The aluminum alloy is made from materials through a fusion casting process and a half-annealing treatment. An aluminum alloy conductor made thereof has a high-elongation rate and good safety and stability in use.

1 . An aluminum alloy material with high elongation for cables, comprising the following components measured by weight percentage: Fe:  0 . 30 ˜ 4 . 20 %, Si: 0.03˜0.10%, rare earth elements (i.e. Ce and La): 0.01˜0.30%, and the rest are Al and inevitable impurities. 
     
     
         2 . The aluminum alloy material with high elongation for cables according to  claim 1 , wherein, the total content of impurities in the aluminum alloy measured by weight percentage is lower than 0.3%. 
     
     
         3 . The aluminum alloy material with high elongation for cables according to  claim 2 , wherein, measured by weight percentage, the content of Ca in the impurities is lower than 0.02%, and the content of any other element in the impurities is lower than 0.01%. 
     
     
         4 . The aluminum alloy material with high extensibility for cables according to  claim 1 , wherein, measured by weight percentage, the content of Ce is 0.005˜0.20%, and the content of La is 0.00˜10.15%. 
     
     
         5 . A method for preparing the aluminum alloy material with high elongation for cables according to  claim 1 , comprising the following steps:
 1) Fusion Casting   First, adding Al alloy containing Si and Fe in 92˜98 parts by weight (pbw) and Al—Fe alloy in 0.73˜5.26 pbw, and heating to 710˜750° C. to melt state; then, heating to 720˜760° C., adding rare earth-Al alloy in 1˜3 pbw and B—Al alloy in 0.17˜0.67 pbw, wherein, the rare earth-Al alloy is the alloy of Al and rare earth elements (Ce and La); next, adding a refining agent in 0.04˜0.06 pbw and refining for 8˜20 minutes; then, holding at the temperature for 20˜40 minutes, and then casting;   2) Semi-Annealing Treatment   Holding the resulting aluminum alloy at 280˜380° C. for 4˜10 hours, and then taking out and cooling naturally to ambient temperature.   
     
     
         6 . The method for preparing the aluminum alloy material with high elongation for cables according to  claim 5 , wherein, the content of Si in said aluminum alloy that contains Si and Fe is 0.07˜0.12%, and the content of Fe in said aluminum alloy that contains Si and Fe is 0.12˜0.13%; the content of Fe in the Al-Fe alloy is 20˜24%, the content of B in the B˜Al alloy is 3˜4%, and the content of Ce and La in the rare earth-Al alloy is  9 ˜ 11 %. 
     
     
         7 . The method for preparing the aluminum alloy material with high elongation for cables according to  claim 5 , wherein, the Al and Al—Fe alloy melt and flow into a holding furnace, ⅓ rare earth-Al alloy is added at 30 minutes before the holding furnace is filled up with the aluminum alloy liquid, and B—Al alloy and the remaining ⅔ rare earth-Al alloy are added at 5 minutes before the holding furnace is filled up with the aluminum alloy liquid. 
     
     
         8 . The method for preparing the aluminum alloy material with high elongation for cables according to  claim 5 , wherein, the powder of refining agent comprises 23% Na 3 Al.F 6 +47% KCl+30% NaCl. 
     
     
         9 . The method for preparing the aluminum alloy material with high elongation for cables according to  claim 5 , wherein, in the casting process, the temperature of casting ladle is 720˜730° C., the temperature of cast strips fed into the rolling machine is 450˜490° C., and the temperature of final rolling is 300° C.