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貼(tie)片(pian)電容(rong)電阻(zu)由哪四大部分組(zu)成的

基板(ban)：

　　基(ji)(ji)板(ban)材料(liao)一(yi)般采用96%的(de)三氧化二鋁陶瓷。基(ji)(ji)板(ban)除(chu)了應具(ju)有良(liang)好的(de)電(dian)絕緣(yuan)性外，還應在高溫下(xia)具(ju)有優良(liang)的(de)導(dao)熱(re)性。電(dian)性能和(he)機械(xie)強度(du)等(deng)特征。此外還要求基(ji)(ji)板(ban)平整，劃(hua)線準確。標準，以充分(fen)保證電(dian)阻(zu)。電(dian)極(ji)漿料(liao)印刷到位。

電(dian)阻膜(mo)：

　　用具有一定電(dian)(dian)阻率的電(dian)(dian)阻漿料(liao)印(yin)刷到陶瓷基板上，再經燒結(jie)而成。電(dian)(dian)阻漿料(liao)一般用二(er)氧(yang)化釕。

保(bao)護(hu)膜：

　　將(jiang)保護(hu)膜(mo)覆蓋(gai)在(zai)電阻膜(mo)上，主要是為了保護(hu)電阻體(ti)。它一方面(mian)(mian)起機械保護(hu)作用，另一方面(mian)(mian)使(shi)電阻體(ti)表面(mian)(mian)具有絕緣(yuan)性(xing)，避免電阻與鄰近導體(ti)接觸而產生(sheng)故障。在(zai)電渡中(zhong)間電極的(de)過程中(zhong)，還可以防(fang)止電渡液對電阻膜(mo)的(de)侵蝕而導致電阻性(xing)能下降。保護(hu)膜(mo)一般是低熔點的(de)玻璃漿料，經印刷(shua)燒結而成(cheng)。

電(dian)極(ji)：

　　是為了保(bao)證(zheng)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器具有(you)良(liang)好的(de)可(ke)焊性(xing)和可(ke)靠性(xing)，一(yi)般(ban)采用三層(ceng)(ceng)(ceng)(ceng)(ceng)電(dian)(dian)(dian)(dian)極結構(gou)：內。中。外(wai)層(ceng)(ceng)(ceng)(ceng)(ceng)電(dian)(dian)(dian)(dian)極。內層(ceng)(ceng)(ceng)(ceng)(ceng)電(dian)(dian)(dian)(dian)極是連接(jie)(jie)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)體的(de)內部電(dian)(dian)(dian)(dian)極，其電(dian)(dian)(dian)(dian)極材料應選擇與電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)膜接(jie)(jie)觸(chu)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)小，與陶瓷基(ji)板結合(he)力強以及耐化學性(xing)好，易于施行(xing)電(dian)(dian)(dian)(dian)鍍作業(ye)。一(yi)般(ban)用銀鈀合(he)金印(yin)刷燒結而成。中間(jian)層(ceng)(ceng)(ceng)(ceng)(ceng)電(dian)(dian)(dian)(dian)極是鍍鎳層(ceng)(ceng)(ceng)(ceng)(ceng)，又稱阻(zu)(zu)(zu)擋層(ceng)(ceng)(ceng)(ceng)(ceng)。其作用是提高(gao)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器在焊接(jie)(jie)時(shi)的(de)耐熱性(xing)，緩沖(chong)(chong)焊接(jie)(jie)時(shi)的(de)熱沖(chong)(chong)擊。它還可(ke)以防止銀離子向電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)膜層(ceng)(ceng)(ceng)(ceng)(ceng)的(de)遷移，避免造(zao)成內部電(dian)(dian)(dian)(dian)極被蝕現象（內部電(dian)(dian)(dian)(dian)極被焊料所熔蝕）外(wai)層(ceng)(ceng)(ceng)(ceng)(ceng)電(dian)(dian)(dian)(dian)極錫(xi)鉛層(ceng)(ceng)(ceng)(ceng)(ceng)，又稱可(ke)焊層(ceng)(ceng)(ceng)(ceng)(ceng)。其作用是使(shi)電(dian)(dian)(dian)(dian)極有(you)良(liang)好的(de)可(ke)焊性(xing)，延(yan)長電(dian)(dian)(dian)(dian)極的(de)保(bao)存期。一(yi)般(ban)用錫(xi)鉛系合(he)金電(dian)(dian)(dian)(dian)鍍而成。

　　矩形片式電(dian)阻(zu)(zu)(zu)(zu)(zu)按(an)電(dian)阻(zu)(zu)(zu)(zu)(zu)材料(liao)分成薄膜型電(dian)阻(zu)(zu)(zu)(zu)(zu)和厚(hou)膜電(dian)阻(zu)(zu)(zu)(zu)(zu)。其中(zhong)薄膜型電(dian)阻(zu)(zu)(zu)(zu)(zu)的精(jing)度高電(dian)阻(zu)(zu)(zu)(zu)(zu)溫度系(xi)數(shu)小。穩定性好，但(dan)阻(zu)(zu)(zu)(zu)(zu)值范圍較窄(zhai)，適用于(yu)精(jing)密和高頻領域。厚(hou)膜電(dian)阻(zu)(zu)(zu)(zu)(zu)則是電(dian)路(lu)中(zhong)應用較廣泛(fan)的。