磁控濺射包含許多種類。各有不同工作原理和使用對象。但有總共同點:使用磁場與電場交互作用,使電子在靶外表鄰近成螺旋狀運轉,然后電子碰擊氬氣發生離子的概率。所發生的離子在電場作用下撞向靶面然后濺射出靶材。
磁(ci)(ci)(ci)(ci)控(kong)濺(jian)射靶(ba)(ba)(ba)(ba)源(yuan)分平(ping)(ping)(ping)衡(heng)(heng)(heng)式(shi)和(he)(he)非(fei)(fei)平(ping)(ping)(ping)衡(heng)(heng)(heng)式(shi),平(ping)(ping)(ping)衡(heng)(heng)(heng)式(shi)靶(ba)(ba)(ba)(ba)源(yuan)鍍膜(mo)(mo)均勻,非(fei)(fei)平(ping)(ping)(ping)衡(heng)(heng)(heng)式(shi)靶(ba)(ba)(ba)(ba)源(yuan)鍍膜(mo)(mo)膜(mo)(mo)層和(he)(he)基體結(jie)合(he)力強。平(ping)(ping)(ping)衡(heng)(heng)(heng)靶(ba)(ba)(ba)(ba)源(yuan)多用(yong)于半導體光學膜(mo)(mo),非(fei)(fei)平(ping)(ping)(ping)衡(heng)(heng)(heng)多用(yong)于磨損裝(zhuang)飾膜(mo)(mo)。磁(ci)(ci)(ci)(ci)控(kong)陰(yin)按照磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)位形散布不(bu)同(tong),大(da)(da)致可(ke)分為平(ping)(ping)(ping)衡(heng)(heng)(heng)態磁(ci)(ci)(ci)(ci)控(kong)陰(yin)和(he)(he)非(fei)(fei)平(ping)(ping)(ping)衡(heng)(heng)(heng)態磁(ci)(ci)(ci)(ci)控(kong)陰(yin)。平(ping)(ping)(ping)衡(heng)(heng)(heng)態磁(ci)(ci)(ci)(ci)控(kong)陰(yin)內(nei)外磁(ci)(ci)(ci)(ci)鋼的磁(ci)(ci)(ci)(ci)通量大(da)(da)致相(xiang)等,兩(liang)(liang)磁(ci)(ci)(ci)(ci)力線(xian)(xian)(xian)閉(bi)合(he)于靶(ba)(ba)(ba)(ba)面,很好地將電子(zi)(zi)(zi)/等離(li)子(zi)(zi)(zi)體束縛在(zai)(zai)靶(ba)(ba)(ba)(ba)面鄰近(jin),增加了磕碰幾(ji)率,提高了離(li)化效率,因而在(zai)(zai)較低的工作氣(qi)壓和(he)(he)電壓下就能起輝(hui)(hui)并(bing)保持輝(hui)(hui)光放電,靶(ba)(ba)(ba)(ba)材使(shi)(shi)用(yong)率相(xiang)對較高。但(dan)由于電子(zi)(zi)(zi)沿磁(ci)(ci)(ci)(ci)力線(xian)(xian)(xian)運動主要閉(bi)合(he)于靶(ba)(ba)(ba)(ba)面,基片(pian)(pian)區域(yu)所受離(li)子(zi)(zi)(zi)轟擊較小。非(fei)(fei)平(ping)(ping)(ping)衡(heng)(heng)(heng)磁(ci)(ci)(ci)(ci)控(kong)濺(jian)射技能,即讓磁(ci)(ci)(ci)(ci)控(kong)陰(yin)外磁(ci)(ci)(ci)(ci)磁(ci)(ci)(ci)(ci)通大(da)(da)于內(nei)磁(ci)(ci)(ci)(ci),兩(liang)(liang)磁(ci)(ci)(ci)(ci)力線(xian)(xian)(xian)在(zai)(zai)靶(ba)(ba)(ba)(ba)面不(bu)完全閉(bi)合(he),部分磁(ci)(ci)(ci)(ci)力線(xian)(xian)(xian)可(ke)沿靶(ba)(ba)(ba)(ba)的邊(bian)際(ji)延伸到基片(pian)(pian)區域(yu),然后部分電子(zi)(zi)(zi)可(ke)以沿著磁(ci)(ci)(ci)(ci)力線(xian)(xian)(xian)擴展(zhan)到基片(pian)(pian),增加基片(pian)(pian)區域(yu)的等離(li)子(zi)(zi)(zi)體密度和(he)(he)氣(qi)體電離(li)率。不(bu)論(lun)平(ping)(ping)(ping)衡(heng)(heng)(heng)還對錯平(ping)(ping)(ping)衡(heng)(heng)(heng),若(ruo)磁(ci)(ci)(ci)(ci)鐵停止,其磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)特性決定了一般靶(ba)(ba)(ba)(ba)材使(shi)(shi)用(yong)率小于30。為增靶(ba)(ba)(ba)(ba)材使(shi)(shi)用(yong)率,可(ke)選用(yong)旋(xuan)轉(zhuan)(zhuan)磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)。但(dan)旋(xuan)轉(zhuan)(zhuan)磁(ci)(ci)(ci)(ci)場(chang)(chang)(chang)需要旋(xuan)轉(zhuan)(zhuan)機構(gou),一起濺(jian)射速率要減小。
旋轉磁場(chang)多用(yong)于(yu)大(da)型或貴重(zhong)靶,如半(ban)導(dao)體膜濺射(she)。關于(yu)小(xiao)型設備和一般工業設備,多用(yong)磁場(chang)停止靶源。
用(yong)(yong)磁(ci)控(kong)靶(ba)源(yuan)濺射(she)金屬和(he)(he)合金很(hen)(hen)簡單,焚燒和(he)(he)濺射(she)很(hen)(hen)方便(bian)。這是由(you)于靶(ba)(陰(yin)),等離(li)子體(ti)和(he)(he)被濺零件/真空腔體(ti)可形成(cheng)回路(lu)。但若濺射(she)絕緣體(ti)(如陶瓷),則回路(lu)斷了(le)。于是人們選用(yong)(yong)高頻(pin)電(dian)(dian)源(yuan),回路(lu)中加(jia)入很(hen)(hen)強的電(dian)(dian)容(rong),這樣在(zai)絕緣回路(lu)中靶(ba)材(cai)成(cheng)了(le)一(yi)個(ge)電(dian)(dian)容(rong)。但高頻(pin)磁(ci)控(kong)濺射(she)電(dian)(dian)源(yuan)貴重(zhong),濺射(she)速率很(hen)(hen)小,一(yi)起(qi)接地(di)技(ji)能很(hen)(hen)雜亂(luan),因(yin)而難大規(gui)模選用(yong)(yong)。為處理此(ci)問題,創造晰磁(ci)控(kong)反(fan)應(ying)濺射(she)。便(bian)是用(yong)(yong)金屬靶(ba),加(jia)入氬氣和(he)(he)反(fan)應(ying)氣體(ti)如氮氣或氧氣。當金屬靶(ba)材(cai)撞向零件時由(you)于能量轉化,與反(fan)應(ying)氣體(ti)化合生成(cheng)氮化物(wu)或氧化物(wu)。
磁控(kong)反應(ying)濺射(she)絕緣體看似(si)簡單,而實(shi)際操作困難。主要問(wen)題(ti)(ti)是反應(ying)不(bu)但發生(sheng)在零(ling)件外(wai)表(biao)(biao)(biao),也發生(sheng)在陽(yang),真空腔體外(wai)表(biao)(biao)(biao)以及靶源(yuan)外(wai)表(biao)(biao)(biao),然后引起救(jiu)活,靶源(yuan)和工件外(wai)表(biao)(biao)(biao)起弧等。德國萊寶(bao)創造的(de)孿生(sheng)靶源(yuan)技(ji)能(neng),很(hen)好的(de)處理了(le)這個(ge)問(wen)題(ti)(ti)。其原(yuan)理是一對靶源(yuan)互相(xiang)為陰陽(yang),然后消除陽(yang)外(wai)表(biao)(biao)(biao)氧化(hua)或氮化(hua)。
冷(leng)卻(que)是一(yi)切源(磁控(kong),多弧,離(li)子(zi))所需,由于能量很大(da)一(yi)部分(fen)轉為熱量,若無冷(leng)卻(que)或冷(leng)卻(que)缺乏(fa),這種熱量將(jiang)使靶源溫(wen)度(du)達一(yi)千度(du)以上然后溶化(hua)整個靶源。
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