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旋轉電極制粉法
來源: | 作者:fxtftc | 發布時(shi)間: 2020-06-16 | 10914 次瀏覽 | 分享到:
       旋轉(zhuan)(zhuan)電(dian)極(ji)制(zhi)(zhi)(zhi)粉(fen)(fen)(fen)法(fa)(rotating electrode com-minuting process) 以金(jin)屬(shu)或合金(jin)制(zhi)(zhi)(zhi)成自(zi)耗電(dian)極(ji),其端面受電(dian)弧加熱而(er)熔融為(wei)液(ye)(ye)體,通(tong)過電(dian)極(ji)高速(su)旋轉(zhuan)(zhuan)的離(li)心力將(jiang)液(ye)(ye)體拋(pao)出并粉(fen)(fen)(fen)碎為(wei)細小液(ye)(ye)滴,繼之冷凝(ning)為(wei)粉(fen)(fen)(fen)末的制(zhi)(zhi)(zhi)粉(fen)(fen)(fen)方法(fa)。這種制(zhi)(zhi)(zhi)粉(fen)(fen)(fen)方法(fa)于1974年首先由(you)美國(guo)核金(jin)屬(shu)公司(si)開發(fa)成功(gong),其工作原理(li)示于圖。
       它(ta)在熔融(rong)和(he)霧化(hua)(hua)金(jin)(jin)屬(shu)過程中完全避免(mian)了造渣和(he)與(yu)耐(nai)火材料(liao)接觸,消除了非(fei)(fei)金(jin)(jin)屬(shu)夾雜物污(wu)(wu)染源,可(ke)生產高(gao)潔(jie)凈(jing)度(du)的(de)(de)粉(fen)末(mo)。典型(xing)的(de)(de)旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)電(dian)(dian)(dian)極(ji)(ji)(ji)制(zhi)粉(fen)設備是由一個直徑達2m多(duo)的(de)(de)箱體(ti)組成,旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)自耗電(dian)(dian)(dian)極(ji)(ji)(ji)通過動(dong)(dong)密(mi)封軸承裝(zhuang)入(ru)其中,電(dian)(dian)(dian)極(ji)(ji)(ji)長軸水平(ping)地(di)處于箱體(ti)中心線位置,電(dian)(dian)(dian)極(ji)(ji)(ji)旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)速度(du)高(gao)達15000~25000r/min。為(wei)了避免(mian)鎢(wu)污(wu)(wu)染,可(ke)在鎢(wu)電(dian)(dian)(dian)極(ji)(ji)(ji)處改用等(deng)(deng)離子(zi)(zi)炬,稱(cheng)為(wei)等(deng)(deng)離子(zi)(zi)旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)電(dian)(dian)(dian)極(ji)(ji)(ji)霧化(hua)(hua)制(zhi)粉(fen)法(PREP);改用電(dian)(dian)(dian)子(zi)(zi)束熔融(rong)自耗電(dian)(dian)(dian)極(ji)(ji)(ji),稱(cheng)為(wei)電(dian)(dian)(dian)子(zi)(zi)束旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)盤(pan)霧化(hua)(hua)制(zhi)粉(fen)法(EBRD)。箱體(ti)內(nei)的(de)(de)保(bao)護氣(qi)氛可(ke)選用惰性氣(qi)體(ti),最好(hao)是氦氣(qi)。因為(wei)它(ta)的(de)(de)熱(re)導率最高(gao),幾乎是氬氣(qi)的(de)(de)10倍。它(ta)既能(neng)提高(gao)冷卻(que)速度(du),又(you)可(ke)改善電(dian)(dian)(dian)弧(hu)特(te)性。旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)電(dian)(dian)(dian)極(ji)(ji)(ji)法制(zhi)取(qu)的(de)(de)粉(fen)末(mo),其粒(li)度(du)分布范圍比(bi)較窄(50~500μm),平(ping)均粒(li)度(du)可(ke)近(jin)似(si)地(di)認為(wei)與(yu)自耗噸極(ji)(ji)(ji)旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)速度(du)成反比(bi)。顆粒(li)形(xing)狀非(fei)(fei)常接近(jin)球形(xing),表面光潔(jie),流動(dong)(dong)性好(hao),可(ke)快速充(chong)填復(fu)雜形(xing)狀模中,能(neng)保(bao)持約65%理論密(mi)度(du)的(de)(de)穩定裝(zhuang)填密(mi)度(du)。這(zhe)種(zhong)粉(fen)特(te)別適(shi)合(he)(he)用于制(zhi)造完全密(mi)實的(de)(de)近(jin)終形(xing)復(fu)雜形(xing)狀零件(jian)。旋(xuan)(xuan)(xuan)(xuan)轉(zhuan)電(dian)(dian)(dian)極(ji)(ji)(ji)法生產的(de)(de)鈦合(he)(he)金(jin)(jin)(Ti-6A1-4V)和(he)鎳基高(gao)溫(wen)合(he)(he)金(jin)(jin)(例如美國牌號INl00和(he)Rene'95)已成功(gong)地(di)用于制(zhi)造航(hang)空(kong)燃氣(qi)渦(wo)輪發動(dong)(dong)機(ji)壓氣(qi)機(ji)轉(zhuan)子(zi)(zi)和(he)渦(wo)輪盤(pan)等(deng)(deng)零部件(jian)。

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