News
中頻(pin)(pin)爐(lu)用(yong)耐火(huo)材(cai)料(liao)多為干式(shi),例(li)如干式(shi)搗(dao)打料(liao),也稱之為打結(jie)料(liao),根據(ju)(ju)化學(xue)性質(zhi)耐材(cai)有中性、堿性和(he)酸性材(cai)料(liao),中頻(pin)(pin)爐(lu)有無芯(xin)中頻(pin)(pin)爐(lu)、有芯(xin)感應爐(lu)等等,根據(ju)(ju)爐(lu)子的(de)特(te)點(dian)和(he)環境來(lai)選擇合適(shi)耐火(huo)材(cai)料(liao)。
對(dui)于熔化鑄鐵的(de)(de)中頻爐內襯(chen)一般采用(yong)價格比(bi)較便宜(yi)的(de)(de)石英砂做(zuo)打(da)結料。當冶(ye)煉(lian)溫度高、冶(ye)煉(lian)條件比(bi)較惡劣(lie)時(shi)石英砂打(da)結料的(de)(de)使(shi)(shi)用(yong)壽命(ming)就大(da)大(da)下降,不能滿(man)足(zu)用(yong)戶的(de)(de)使(shi)(shi)用(yong)要(yao)求。這時(shi)就需要(yao)采用(yong)鎂質(zhi)、鎂鋁質(zhi)、鎂鉻質(zhi)等干式打(da)結料(也(ye)就是大(da)家常說的(de)(de)堿性爐襯(chen)材料)。
耐(nai)火材料常見的成型方(fang)法(fa)有(you)哪些(xie)
耐(nai)材(cai)的(de)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)方(fang)式很多,常見的(de)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)方(fang)法有擠(ji)壓(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)、振動成(cheng)(cheng)(cheng)(cheng)(cheng)形(xing)、擠(ji)壓(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)、搗打成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)、等靜壓(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)、熔鑄成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)、注漿成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)等。目前耐(nai)火材(cai)料(liao)生產中使(shi)用更多的(de)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)方(fang)法為(wei)機(ji)(ji)壓(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)法,該法使(shi)用壓(ya)磚機(ji)(ji)和(he)模具(ju)將泥料(liao)壓(ya)制(zhi)成(cheng)(cheng)(cheng)(cheng)(cheng)胚體,因因一般含水率約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)。機(ji)(ji)壓(ya)成(cheng)(cheng)(cheng)(cheng)(cheng)型(xing)具(ju)有配體結構致密(mi),強度(du)(du)高,干(gan)燥和(he)燒(shao)成(cheng)(cheng)(cheng)(cheng)(cheng)收(shou)縮小,尺寸也(ye)容易控制(zhi),又(you)可(ke)分為(wei)單面加壓(ya),和(he)雙(shuang)面加壓(ya)兩種,后(hou)者可(ke)減小胚體的(de)層(ceng)密(mi)度(du)(du)現象。
選擇何種成(cheng)(cheng)型(xing)方法主要(yao)根據泥料性(xing)質(zhi),胚體的(de)形(xing)(xing)(xing)狀、尺寸及其他工(gong)藝要(yao)求,除覺(jue)大部分耐(nai)火(huo)材料采用(yong)(yong)機壓成(cheng)(cheng)形(xing)(xing)(xing)外振動(dong)成(cheng)(cheng)形(xing)(xing)(xing)用(yong)(yong)于(yu)(yu)成(cheng)(cheng)型(xing)大的(de)異形(xing)(xing)(xing)坯(pi)(pi)體,擠壓成(cheng)(cheng)型(xing)一(yi)般用(yong)(yong)于(yu)(yu)管狀坯(pi)(pi)體的(de)成(cheng)(cheng)型(xing),注漿成(cheng)(cheng)型(xing)一(yi)般用(yong)(yong)于(yu)(yu)中空壁薄的(de)坯(pi)(pi)體成(cheng)(cheng)形(xing)(xing)(xing)。等靜壓成(cheng)(cheng)型(xing)目前主要(yao)用(yong)(yong)于(yu)(yu)高(gao)性(xing)能耐(nai)火(huo)材料的(de)生產。
當然(ran),成(cheng)型(xing)方法的(de)選(xuan)擇還受到生(sheng)產廠(chang)設備條件的(de)限制,因而(er)某些制品就(jiu)不能(neng)采(cai)用成(cheng)型(xing)方法。在(zai)這種情況下,企業應在(zai)滿足制品技術要求的(de)前提下,選(xuan)擇其他(ta)較為合適(shi)的(de)成(cheng)型(xing)方法。
中(zhong)頻爐耐(nai)火材料打結(jie)成(cheng)型(xing)辦法:
1、要按規則的粒度制造好砂(sha)料,并與添(tian)加劑均(jun)勻混(hun)合(he)(he)。如果選用濕法打結時(shi),可參加1%~2%的水分,混(hun)合(he)(he)后放置1~2h后運(yun)用。
2、在感應器內側鋪以(yi)石棉布。
3、爐底(di)打(da)結(jie)。分批參加(jia)砂料(liao)后,每(mei)次(ci)用直徑為12~14mm的尖頭鋼釬(han)重復(fu)搗實(shi)。爐底(di)打(da)結(jie)加(jia)料(liao)次(ci)數(shu)為4~5次(ci),爐底(di)的厚度一般打(da)結(jie)到規則(ze)高(gao)度,每(mei)次(ci)打(da)結(jie)時刻(ke)至少10min。
4、放入坩(gan)堝型芯,即操控坩(gan)堝形狀和(he)容(rong)積(ji)的胎(tai)具。
5、爐(lu)口打(da)結。