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氧化(hua)鋁陶瓷成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)的方法有很(hen)多種(zhong),常(chang)見的成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)方法主要有干壓成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)、擠壓成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)、注射(she)成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)、流(liu)延成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)與熱等靜壓成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)等,當然也出現了不少新的成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)工藝,如壓濾成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)、固體自由(you)成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)、凝膠注成(cheng)型(xing)(xing)(xing)(xing)(xing)(xing)等。
干壓(ya)成型(xing)(xing)是利用(yong)外(wai)力作(zuo)用(yong),增大內(nei)摩擦力,使顆(ke)粒之間(jian)由于內(nei)摩擦力的(de)作(zuo)用(yong)而產(chan)生聯結(jie),維持(chi)一定形狀的(de)一種成型(xing)(xing)方法,工藝相對(dui)比較簡(jian)單,操作(zuo)起來比其他方法更加容易(yi)。凝膠注(zhu)模(mo)成型(xing)(xing)的(de)成型(xing)(xing)周期比其他方法短,在脫(tuo)模(mo)時(shi),不易(yi)發生變形開裂(lie),有機(ji)載體添(tian)加的(de)量(liang)比以前降低,而且(qie)這種成型(xing)(xing)方法對(dui)脫(tuo)脂十分有利。
氧(yang)化鋁(lv)陶瓷(ci)的注(zhu)凝成(cheng)型工藝首先要選用高濃度(du)(du)(du)低黏度(du)(du)(du)的漿料進行(xing)注(zhu)模(mo),然后通過加入的引發劑(ji)(ji)和催化劑(ji)(ji),調(diao)節溫度(du)(du)(du)使有(you)機單體聚合,以三(san)維網狀的形(xing)式形(xing)成(cheng)擁有(you)一定(ding)強度(du)(du)(du)的生(sheng)坯,再經(jing)脫(tuo)模(mo)、干燥、排膠處理(li)后燒(shao)結,獲得產品。注(zhu)凝成(cheng)型的優(you)點是工藝較簡單,成(cheng)型的素坯均勻性好,強度(du)(du)(du)高且容易加工。而(er)且,這(zhe)種成(cheng)型方法對模(mo)具沒有(you)太多的要求,成(cheng)型過程中坯體的收縮(suo)較小,適合于(yu)制作(zuo)尺(chi)寸(cun)較大、形(xing)狀復雜的陶瓷(ci)件。
流延成(cheng)(cheng)型(xing)適用于(yu)薄片(pian)陶(tao)瓷(ci)材料(liao)(liao)的制(zhi)作,利用這個方(fang)法(fa)成(cheng)(cheng)型(xing)一(yi)般(ban)要在陶(tao)瓷(ci)粉料(liao)(liao)中添(tian)加(jia)其他成(cheng)(cheng)分,如黏結劑(ji)(ji)、分散劑(ji)(ji)、增(zeng)塑(su)劑(ji)(ji)等,制(zhi)作成(cheng)(cheng)漿(jiang)料(liao)(liao)十分均(jun)勻,從(cong)而使得到(dao)的陶(tao)瓷(ci)片(pian)厚度符合(he)制(zhi)作的要求。