中(zhong)頻(pin)爐用耐火材料多為(wei)干式，例如干式搗打料，也稱之為(wei)打結料，根據化(hua)學性(xing)質(zhi)耐材有(you)中(zhong)性(xing)、堿性(xing)和酸性(xing)材料，中(zhong)頻(pin)爐有(you)無芯(xin)中(zhong)頻(pin)爐、有(you)芯(xin)感應爐等(deng)等(deng)，根據爐子的特(te)點和環(huan)境來選擇合適耐火材料。

對(dui)于(yu)熔化鑄鐵(tie)的中頻爐內襯一般采(cai)用(yong)(yong)價格(ge)比較便宜的石英砂做打(da)結料(liao)。當(dang)冶(ye)煉(lian)(lian)溫度(du)高、冶(ye)煉(lian)(lian)條件比較惡劣時石英砂打(da)結料(liao)的使用(yong)(yong)壽命就(jiu)大(da)大(da)下降，不能(neng)滿足用(yong)(yong)戶的使用(yong)(yong)要(yao)(yao)求。這時就(jiu)需要(yao)(yao)采(cai)用(yong)(yong)鎂(mei)(mei)質、鎂(mei)(mei)鋁質、鎂(mei)(mei)鉻質等干式打(da)結料(liao)（也就(jiu)是大(da)家常說的堿性爐襯材(cai)料(liao)）。

耐(nai)火材(cai)料常見的成型(xing)方法(fa)有哪些

耐材的(de)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)方式很多，常見(jian)的(de)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)方法有擠壓(ya)(ya)(ya)(ya)(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)、振動成(cheng)(cheng)(cheng)(cheng)(cheng)形、擠壓(ya)(ya)(ya)(ya)(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)、搗(dao)打成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)、等靜(jing)壓(ya)(ya)(ya)(ya)(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)、熔鑄成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)、注漿成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)等。目前耐火(huo)材料(liao)生產(chan)中(zhong)使用(yong)更多的(de)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)方法為(wei)機壓(ya)(ya)(ya)(ya)(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)法，該法使用(yong)壓(ya)(ya)(ya)(ya)(ya)磚機和模具將泥料(liao)壓(ya)(ya)(ya)(ya)(ya)制成(cheng)(cheng)(cheng)(cheng)(cheng)胚體，因因一(yi)般(ban)含水率約5%的(de)半(ban)干(gan)泥料(liao)，故也(ye)成(cheng)(cheng)(cheng)(cheng)(cheng)為(wei)半(ban)干(gan)法成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)。機壓(ya)(ya)(ya)(ya)(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)(xing)(xing)具有配體結構(gou)致密(mi)，強度(du)高，干(gan)燥和燒成(cheng)(cheng)(cheng)(cheng)(cheng)收縮小(xiao)，尺寸也(ye)容易控制，又可分為(wei)單面加壓(ya)(ya)(ya)(ya)(ya)，和雙面加壓(ya)(ya)(ya)(ya)(ya)兩(liang)種，后者可減小(xiao)胚體的(de)層密(mi)度(du)現象。

選擇何(he)種成(cheng)型(xing)方法主要根據泥料(liao)性(xing)質，胚(pei)體的(de)形(xing)狀、尺(chi)寸及其(qi)他工(gong)藝要求，除覺大(da)部(bu)分(fen)耐火材(cai)料(liao)采用(yong)機壓成(cheng)形(xing)外(wai)振動成(cheng)形(xing)用(yong)于(yu)成(cheng)型(xing)大(da)的(de)異形(xing)坯體，擠壓成(cheng)型(xing)一般(ban)用(yong)于(yu)管(guan)狀坯體的(de)成(cheng)型(xing)，注(zhu)漿成(cheng)型(xing)一般(ban)用(yong)于(yu)中(zhong)空壁(bi)薄(bo)的(de)坯體成(cheng)形(xing)。等靜(jing)壓成(cheng)型(xing)目前主要用(yong)于(yu)高性(xing)能耐火材(cai)料(liao)的(de)生產(chan)。

當然，成型(xing)方(fang)法的(de)選(xuan)擇還受到生產廠(chang)設備條件的(de)限制，因而某些制品就不能(neng)采用成型(xing)方(fang)法。在這種情況下，企業應(ying)在滿(man)足制品技術要求(qiu)的(de)前提下，選(xuan)擇其(qi)他較為合(he)適的(de)成型(xing)方(fang)法。

中頻爐耐(nai)火材料(liao)打結成型(xing)辦法(fa)：

1、要按(an)規則的粒度制造好砂料，并與添加劑(ji)均勻混(hun)合(he)。如果選用(yong)濕法打結(jie)時，可(ke)參加1%～2%的水分，混(hun)合(he)后(hou)放置1～2h后(hou)運用(yong)。

2、在感(gan)應(ying)器內側鋪以石棉布(bu)。

3、爐底(di)(di)打(da)結(jie)。分批參加砂料(liao)后，每次用(yong)直徑為12～14mm的尖(jian)頭鋼釬重復搗實。爐底(di)(di)打(da)結(jie)加料(liao)次數(shu)為4～5次，爐底(di)(di)的厚度一般打(da)結(jie)到規則高度，每次打(da)結(jie)時刻至少(shao)10min。

4、放入(ru)坩(gan)堝(guo)型芯，即(ji)操控坩(gan)堝(guo)形(xing)狀和容積的胎具(ju)。

5、爐口打(da)結。