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貼片(pian)電容(rong)電阻(zu)由哪四大部分組成的

基板：

　　基板材料(liao)一(yi)般采用96%的三氧化(hua)二鋁陶瓷。基板除了應具(ju)有(you)良(liang)好的電(dian)絕緣性(xing)外，還應在高溫下具(ju)有(you)優良(liang)的導(dao)熱性(xing)。電(dian)性(xing)能和機(ji)械強度等特征。此外還要求基板平整，劃線準確。標準，以充分(fen)保(bao)證電(dian)阻。電(dian)極(ji)漿料(liao)印刷到位。

電阻膜：

　　用(yong)具有一定電阻率的電阻漿(jiang)料印刷到陶瓷(ci)基板上(shang)，再經燒結而成。電阻漿(jiang)料一般用(yong)二氧(yang)化釕。

保護膜(mo)：

　　將保護膜(mo)覆(fu)蓋在電(dian)阻(zu)(zu)膜(mo)上(shang)，主要是為了保護電(dian)阻(zu)(zu)體。它一(yi)方面(mian)起機(ji)械保護作(zuo)用，另一(yi)方面(mian)使(shi)電(dian)阻(zu)(zu)體表(biao)面(mian)具有絕緣性，避免電(dian)阻(zu)(zu)與鄰近導體接觸而產生故障。在電(dian)渡(du)中間電(dian)極的過程中，還可(ke)以(yi)防止電(dian)渡(du)液對電(dian)阻(zu)(zu)膜(mo)的侵蝕而導致電(dian)阻(zu)(zu)性能下降(jiang)。保護膜(mo)一(yi)般是低熔(rong)點(dian)的玻璃漿料，經(jing)印刷燒結而成。

電極：

　　是為了保(bao)(bao)證電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)器(qi)具(ju)有良(liang)好(hao)(hao)的可(ke)(ke)焊(han)性(xing)(xing)和可(ke)(ke)靠(kao)性(xing)(xing)，一(yi)般(ban)采用三層(ceng)(ceng)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)結構：內(nei)(nei)。中。外層(ceng)(ceng)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)。內(nei)(nei)層(ceng)(ceng)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)是連(lian)接電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)體(ti)的內(nei)(nei)部(bu)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)，其(qi)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)材料應選(xuan)擇與(yu)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)膜接觸電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)小，與(yu)陶瓷基板結合力(li)強(qiang)以及耐(nai)化(hua)學性(xing)(xing)好(hao)(hao)，易于施(shi)行電(dian)(dian)(dian)(dian)(dian)(dian)鍍作(zuo)業(ye)。一(yi)般(ban)用銀鈀合金(jin)印刷(shua)燒結而(er)成。中間層(ceng)(ceng)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)是鍍鎳層(ceng)(ceng)，又(you)(you)稱阻(zu)擋層(ceng)(ceng)。其(qi)作(zuo)用是提(ti)高電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)器(qi)在焊(han)接時的耐(nai)熱性(xing)(xing)，緩沖(chong)焊(han)接時的熱沖(chong)擊。它還可(ke)(ke)以防(fang)止(zhi)銀離子(zi)向電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)膜層(ceng)(ceng)的遷移，避免(mian)造(zao)成內(nei)(nei)部(bu)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)被蝕現象（內(nei)(nei)部(bu)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)被焊(han)料所熔蝕）外層(ceng)(ceng)電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)錫鉛層(ceng)(ceng)，又(you)(you)稱可(ke)(ke)焊(han)層(ceng)(ceng)。其(qi)作(zuo)用是使電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)有良(liang)好(hao)(hao)的可(ke)(ke)焊(han)性(xing)(xing)，延(yan)長電(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)的保(bao)(bao)存期。一(yi)般(ban)用錫鉛系(xi)合金(jin)電(dian)(dian)(dian)(dian)(dian)(dian)鍍而(er)成。

　　矩形片式(shi)電(dian)阻(zu)(zu)按電(dian)阻(zu)(zu)材料分成薄膜(mo)型電(dian)阻(zu)(zu)和(he)厚膜(mo)電(dian)阻(zu)(zu)。其中(zhong)薄膜(mo)型電(dian)阻(zu)(zu)的精(jing)度高(gao)電(dian)阻(zu)(zu)溫度系數小。穩定(ding)性好(hao)，但(dan)阻(zu)(zu)值范圍較窄，適(shi)用(yong)于精(jing)密和(he)高(gao)頻領域。厚膜(mo)電(dian)阻(zu)(zu)則(ze)是電(dian)路中(zhong)應(ying)用(yong)較廣泛(fan)的。