銅(tong)(tong)包(bao)鋁就是在鋁絲或(huo)鋁鎂絲的外面(mian)包(bao)一(yi)層銅(tong)(tong)或(huo)鍍一(yi)層銅(tong)(tong)。優點：導(dao)電性能(neng)不錯(cuo)，質量輕，比(bi)重(zhong)小，價格便(bian)宜，原(yuan)材(cai)(cai)料(liao)加工和生產(chan)(chan)比(bi)較方便(bian)，基于銅(tong)(tong)線(xian)生產(chan)(chan)一(yi)樣，是代替銅(tong)(tong)材(cai)(cai)導(dao)體的優良材(cai)(cai)料(liao)；缺(que)點：生產(chan)(chan)易斷(duan)線(xian)、脆、鍍錫(xi)掉錫(xi)；強度低，裸在常溫下容易氧化，沾(zhan)水后銅(tong)(tong)包(bao)鋁絲發黑，氧化加速等(deng)。

銅(tong)(tong)包(bao)鋁絲(si)和鋁鎂(mei)絲(si)常用為：芯線(xian)導體，纏繞屏蔽(bi)、編織屏蔽(bi)。銅(tong)(tong)包(bao)鋁、銅(tong)(tong)包(bao)鋁鎂(mei)、銅(tong)(tong)包(bao)鋼從外觀上看起(qi)來好像就是銅(tong)(tong)絲(si)，在(zai)不(bu)專業的情況下很容易(yi)把二者搞(gao)混。

下面我(wo)們介(jie)紹(shao)下三(san)種識(shi)別的方法：

一、         看(kan)截(jie)面。因(yin)為較粗的電線使用銅包鋁的話(hua)，很(hen)容易就(jiu)可以看(kan)出。所以一般銅包鋁是軟線，有很(hen)多小細絲多股(gu)組成。但只要剪開截(jie)面，看(kan)有發白的（鋁的顏(yan)色）就(jiu)可以識別是什么(me)材質了。

二、         火燒(shao)法。只須用打(da)火機燒(shao)，看(kan)燃(ran)燒(shao)的現(xian)象和(he)(he)燃(ran)燒(shao)之(zhi)后的結果(guo)(guo)，銅包鋁和(he)(he)銅包鋁鎂絲(si)，當火焰接角到線絲(si)時(shi)，導體便會直線下垂(chui)，不(bu)易燒(shao)斷(duan)(duan)，燃(ran)燒(shao)過(guo)后，導體顏色為(wei)(wei)灰色或(huo)者更黑；因為(wei)(wei)鋁的溶點比銅的熔(rong)(rong)點低。區別：銅包鋁燃(ran)燒(shao)過(guo)后的導體用手指一捻就會斷(duan)(duan)，比較脆，會斷(duan)(duan)成(cheng)多節。如果(guo)(guo)無氧(yang)銅銅絲(si)灼(zhuo)燒(shao)后形(xing)成(cheng)球(qiu)珠(zhu)狀物的即(ji)為(wei)(wei)銅絲(si)，銅絲(si)粗(cu)細不(bu)一灼(zhuo)燒(shao)過(guo)后結果(guo)(guo)也不(bu)一樣，細絲(si)熔(rong)(rong)、粗(cu)絲(si)原樣。

三、         用(yong)(yong)工(gong)具刮(gua)擦(ca)。鍍錫銅(tong)(tong)絲(si)(si)刮(gua)擦(ca)后顯(xian)現(xian)黃(huang)色(se)、乃為銅(tong)(tong)。無氧銅(tong)(tong)絲(si)(si)刮(gua)擦(ca)后仍是(shi)原色(se)亦是(shi)銅(tong)(tong)。而(er)銅(tong)(tong)包(bao)鋁絲(si)(si)和銅(tong)(tong)包(bao)鋁鎂絲(si)(si)則出(chu)現(xian)雪(xue)花(hua)點白色(se)。或將(jiang)絲(si)(si)置于水(shui)泥(ni)地面(mian)上磨擦(ca)也能得到(dao)同樣效果。銅(tong)(tong)包(bao)鋼(gang)亦可(ke)有此法或用(yong)(yong)磁鐵(tie)辨認。以上三種方(fang)法搭配著用(yong)(yong)，相(xiang)信鑒定出(chu)銅(tong)(tong)絲(si)(si)將(jiang)不是(shi)難事，購(gou)買到(dao)價(jia)廉物美的線纜也很簡單。

最后要說的是(shi)銅(tong)(tong)(tong)包(bao)(bao)銅(tong)(tong)(tong)、何(he)為銅(tong)(tong)(tong)包(bao)(bao)銅(tong)(tong)(tong)，就是(shi)無氧(yang)銅(tong)(tong)(tong)包(bao)(bao)黃(huang)銅(tong)(tong)(tong)。

無氧(yang)銅：不含(han)氧(yang)也(ye)不含(han)任何(he)脫氧(yang)劑殘留物的(de)(de)純(chun)銅。但實際上還是含(han)有非(fei)常微量氧(yang)和一些雜質。按標準規定，氧(yang)的(de)(de)含(han)量不大于0.03%,雜質總含量不大于0.05%,銅的純度大(da)于99.95%,純度(du)為99.995%的(de)金屬銅一般用于音響器材\真空電(dian)子器件(jian)\電纜(lan)等電工(gong)電子應(ying)用之中(zhong),無氧銅無氫(qing)脆現(xian)象,導(dao)電率高.加工性能和焊接性能\耐蝕性能和低溫性能均(jun)好;但(dan)比重大(da),價格高(gao).

黃銅:是由(you)銅和(he)鋅所組成的(de)合金(jin).

含銅在62%-68%,比重在(zai)8.2-8.4之間,如果只是(shi)由銅(tong)\鋅組(zu)成的(de)黃銅就叫作(zuo)普通黃銅.二種以上的(de)元(yuan)素組成的(de)多種合金就稱為特殊黃銅;所拉(la)成的無縫銅管,質軟\耐磨性能強(qiang).適(shi)合制造板料\條(tiao)材(cai)\棒材\管材\鑄(zhu)零件(jian)等.可(ke)塑(su)性(xing)強(qiang),制造耐壓設備等.但偏脆\抗拉強(qiang)度(du)低,比(bi)較輕(qing),價格(ge)便宜.

鑒別銅(tong)絲是否銅(tong)包銅(tong),用第三種方法最有效,表皮(pi)的無氧銅(tong)(tong)和內(nei)在的黃銅(tong)(tong)用刀片刮擦后,肉(rou)眼(yan)就能分辨出(chu)來(lai).

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                                                                                                                             編輯：余匯川