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使用真空燒結爐需要注意什么問題
發布時間:2020-01-09   瀏覽:6763次

  使用真空燒結爐需要注意什么問(wen)題

  因為真空是一種理想的惰性氣體。當其它一次或惰性氣體不合適,或材料容易脫碳和滲碳時,可采用真空燒結爐。在(zai)實驗(yan)中(zhong),它可以提高(gao)液(ye)相(xiang)燒(shao)結(jie)的(de)潤(run)濕性,有利于燒(shao)結(jie)過程中(zhong)的(de)收縮,改善合金(jin)的(de)組織。

  使用(yong)真(zhen)空燒(shao)結爐有(you)利于吸附氣體的去除,對燒(shao)結后期的收縮有(you)明顯的促(cu)進作(zuo)用(yong)。去除硅、鋁、鎂(mei)、鈣及(ji)其氧化(hua)物等雜質,起到凈化(hua)材料的作(zuo)用(yong)。

  科研或(huo)是大中專院校做實驗之所以喜歡(huan)使用真空(kong)燒結爐(lu),是因為它(ta)能減少大氣(qi)中有害(hai)成分(水、氧、氮等)對產(chan)品(pin)的(de)污染。例如,將電解氫中的(de)含(han)水量降低到-40℃是困難(nan)的(de),而(er)在真空(kong)燒結中,只要在幾(ji)百帕(pa)的(de)范圍內(nei),真空(kong)含(han)量就相當于(yu)-40℃的(de)***。

  不過(guo),需要注(zhu)意的(de)是,真空(kong)燒結爐保溫(wen)時間(jian)越(yue)(yue)長,粘結金屬的(de)揮發(fa)損失越(yue)(yue)大。因此,化(hua)學(xue)雜質、水和其他材料與(yu)材料中的(de)碳(tan)(tan)發(fa)生(sheng)反應,導致一氧(yang)化(hua)碳(tan)(tan)與(yu)爐內排(pai)放。此時,爐壓(ya)明顯(xian)升高,合金中總碳(tan)(tan)含量降低。顯(xian)然,碳(tan)(tan)含量的(de)變化(hua)取(qu)決于原料粉末中的(de)氧(yang)含量和燒結過(guo)程中的(de)真空(kong)度。二者越(yue)(yue)高,產生(sheng)一氧(yang)化(hua)碳(tan)(tan)的(de)反應越(yue)(yue)容(rong)易,脫碳(tan)(tan)越(yue)(yue)嚴重(zhong)。

  真空(kong)甩(shuai)帶爐廠家表(biao)示,粘(zhan)結(jie)(jie)金屬在(zai)真空(kong)液相(xiang)燒結(jie)(jie)過程中的(de)揮發損失(shi)(shi)是一個重(zhong)要問題(ti)。這不僅改(gai)變(bian)和影響了合金的(de)***終成分和結(jie)(jie)構,而且阻礙了燒結(jie)(jie)過程本身(shen)。粘(zhan)結(jie)(jie)金屬的(de)揮發損失(shi)(shi)主要發生在(zai)燒結(jie)(jie)后期(即保溫階段)。


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21 April 2023
真空燒結爐真空度不足是什么原因造成的

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  真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)燒(shao)(shao)(shao)結(jie)(jie)爐(lu)(lu)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)不(bu)足(zu)(zu)是(shi)(shi)什么原(yuan)因造(zao)(zao)成的(de)(de)  真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)燒(shao)(shao)(shao)結(jie)(jie)爐(lu)(lu)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)不(bu)足(zu)(zu)可(ke)能由(you)以下原(yuan)因造(zao)(zao)成:  1.真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)泵(beng)故(gu)障(zhang):真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)泵(beng)是(shi)(shi)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)燒(shao)(shao)(shao)結(jie)(jie)爐(lu)(lu)中關(guan)鍵的(de)(de)設(she)備(bei)(bei)之(zhi)一,如(ru)果(guo)(guo)(guo)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)泵(beng)故(gu)障(zhang),就會影(ying)響(xiang)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)。可(ke)能的(de)(de)故(gu)障(zhang)原(yuan)因包(bao)括真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)泵(beng)內部(bu)部(bu)件(jian)損(sun)(sun)壞、密(mi)封(feng)(feng)不(bu)嚴(yan)(yan)(yan)、油封(feng)(feng)老化(hua)(hua)等(deng)。  2.密(mi)封(feng)(feng)不(bu)嚴(yan)(yan)(yan):真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)燒(shao)(shao)(shao)結(jie)(jie)爐(lu)(lu)需要(yao)保持高真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)才能獲(huo)得良(liang)好的(de)(de)燒(shao)(shao)(shao)結(jie)(jie)效果(guo)(guo)(guo),如(ru)果(guo)(guo)(guo)密(mi)封(feng)(feng)不(bu)嚴(yan)(yan)(yan),就會導(dao)致(zhi)氣體(ti)(ti)泄(xie)漏,從而降低真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)。密(mi)封(feng)(feng)不(bu)嚴(yan)(yan)(yan)的(de)(de)原(yuan)因可(ke)能包(bao)括密(mi)封(feng)(feng)件(jian)老化(hua)(hua)、密(mi)封(feng)(feng)面損(sun)(sun)壞、固定螺釘松(song)動(dong)等(deng)。  3.真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)管(guan)路老化(hua)(hua):真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)管(guan)路也是(shi)(shi)影(ying)響(xiang)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)的(de)(de)重(zhong)要(yao)因素,如(ru)果(guo)(guo)(guo)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)管(guan)路老化(hua)(hua)或者出(chu)現(xian)(xian)損(sun)(sun)壞,就會導(dao)致(zhi)氣體(ti)(ti)泄(xie)漏,從而降低真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)。  4.燒(shao)(shao)(shao)結(jie)(jie)室內污染:在(zai)燒(shao)(shao)(shao)結(jie)(jie)過程中,可(ke)能會產生一些氣體(ti)(ti)或者雜(za)質,如(ru)果(guo)(guo)(guo)這(zhe)些氣體(ti)(ti)或者雜(za)質不(bu)能被及時排除(chu),就會影(ying)響(xiang)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)。  5.真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)檢(jian)(jian)測儀器損(sun)(sun)壞:真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)檢(jian)(jian)測儀器是(shi)(shi)判斷(duan)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)的(de)(de)關(guan)鍵設(she)備(bei)(bei),如(ru)果(guo)(guo)(guo)檢(jian)(jian)測儀器損(sun)(sun)壞,就會導(dao)致(zhi)無法準確地判斷(duan)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)。  因此,為了(le)保證真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)燒(shao)(shao)(shao)結(jie)(jie)爐(lu)(lu)的(de)(de)正(zheng)常運行,需要(yao)定期檢(jian)(jian)查和(he)維護設(she)備(bei)(bei),及時發現(xian)(xian)并排除(chu)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)(du)不(bu)足(zu)(zu)的(de)(de)原(yuan)因。

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