DOWCORNING道康寧DC705擴(kuo)(kuo)散泵(beng)(beng)硅(gui)油(you)(you)(you)(you) 高(gao)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)技術中使(shi)用(yong)(yong)(yong)(yong)(yong)的(de)(de)擴(kuo)(kuo)散泵(beng)(beng)油(you)(you)(you)(you)，要(yao)求(qiu)耐熱(re)氧(yang)化(hua)(hua)(hua)性(xing)，冷(leng)卻溫度下(xia)(xia)蒸(zheng)(zheng)氣(qi)(qi)壓(ya)(ya)(ya)低(di)(di)，且其(qi)蒸(zheng)(zheng)氣(qi)(qi)壓(ya)(ya)(ya)隨溫度變化(hua)(hua)(hua)大，沸騰溫度不(bu)能(neng)過高(gao)。早期曾使(shi)用(yong)(yong)(yong)(yong)(yong)水(shui)銀(yin)，目前主要(yao)使(shi)用(yong)(yong)(yong)(yong)(yong)礦(kuang)油(you)(you)(you)(you)類、酯類、聚苯(ben)醚及(ji)硅(gui)油(you)(you)(you)(you)等。其(qi)中以(yi)硅(gui)油(you)(you)(you)(you)的(de)(de)性(xing)能(neng)zui好，它具有熱(re)氧(yang)化(hua)(hua)(hua)穩(wen)定性(xing)高(gao)、粘溫系數(shu)小(xiao)、沸點(dian)(dian)范(fan)圍窄、蒸(zheng)(zheng)氣(qi)(qi)壓(ya)(ya)(ya)曲線陡(dou)（溫度變化(hua)(hua)(hua)一(yi)點(dian)(dian)，蒸(zheng)(zheng)氣(qi)(qi)壓(ya)(ya)(ya)變化(hua)(hua)(hua)很(hen)大），常溫蒸(zheng)(zheng)氣(qi)(qi)壓(ya)(ya)(ya)低(di)(di)，凝固點(dian)(dian)低(di)(di)，加(jia)(jia)之化(hua)(hua)(hua)學(xue)惰(duo)性(xing)，wudu、無(wu)味、無(wu)腐蝕(shi)。因而它可在(zai)(zai)(zai)250℃下(xia)(xia)長(chang)時(shi)(shi)(shi)間(jian)(jian)使(shi)用(yong)(yong)(yong)(yong)(yong)，在(zai)(zai)(zai)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)下(xia)(xia)允許在(zai)(zai)(zai)更高(gao)溫度下(xia)(xia)使(shi)用(yong)(yong)(yong)(yong)(yong)。 當(dang)前各國使(shi)用(yong)(yong)(yong)(yong)(yong)的(de)(de)擴(kuo)(kuo)散泵(beng)(beng)硅(gui)油(you)(you)(you)(you)主要(yao)仍是DOWCORNING公司(si)開發的(de)(de)下(xia)(xia)列兩種：DC-704和(he)DC-705。使(shi)用(yong)(yong)(yong)(yong)(yong)上述硅(gui)油(you)(you)(you)(you)可獲得1.333×10-7~1.333×10-11kPa（無(wu)阱(jing)條件(jian)下(xia)(xia)）及(ji)1.333×10-10~1.333×10-12kPa。 DOWCORNING擴(kuo)(kuo)散泵(beng)(beng)油(you)(you)(you)(you)是為高(gao)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)和(he)在(zai)(zai)(zai)生產作業中快(kuai)(kuai)(kuai)速(su)對大容積(ji)氣(qi)(qi)體抽真(zhen)(zhen)(zhen)空(kong)(kong)(kong)而設計(ji)的(de)(de)，國內95%以(yi)上的(de)(de)進口擴(kuo)(kuo)散泵(beng)(beng)指(zhi)定用(yong)(yong)(yong)(yong)(yong)DOWCORNING的(de)(de)擴(kuo)(kuo)散泵(beng)(beng)硅(gui)油(you)(you)(you)(you)。 特點(dian)(dian)： 縮短調節運行時(shi)(shi)(shi)間(jian)(jian)； 單一(yi)組分(fen)硅(gui)油(you)(you)(you)(you)比用(yong)(yong)(yong)(yong)(yong)多組分(fen)硅(gui)油(you)(you)(you)(you)達到zui大真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度需要(yao)的(de)(de)時(shi)(shi)(shi)間(jian)(jian)短得多； 快(kuai)(kuai)(kuai)速(su)抽空(kong)(kong)(kong)； 極小(xiao)的(de)(de)回(hui)流，DOWCORNING單一(yi)組分(fen)硅(gui)油(you)(you)(you)(you)的(de)(de)蒸(zheng)(zheng)汽壓(ya)(ya)(ya)力是很(hen)低(di)(di)的(de)(de)，以(yi)zhi對于許多應用(yong)(yong)(yong)(yong)(yong)阱(jing)或現存(cun)的(de)(de)阱(jing)致(zhi)冷(leng)是不(bu)需要(yao)的(de)(de)； 較(jiao)長(chang)的(de)(de)服務壽(shou)ming； 硅(gui)油(you)(you)(you)(you)的(de)(de)熱(re)和(he)化(hua)(hua)(hua)學(xue)穩(wen)定性(xing)允許長(chang)久的(de)(de)運行而不(bu)被(bei)惡化(hua)(hua)(hua)和(he)污(wu)染； 清洗系統(tong)維(wei)修(xiu)需求(qiu)較(jiao)少； 較(jiao)快(kuai)(kuai)(kuai)的(de)(de)循環，減少停機(ji)時(shi)(shi)(shi)間(jian)(jian)，更換油(you)(you)(you)(you)的(de)(de)需求(qiu)少。 用(yong)(yong)(yong)(yong)(yong)途： 使(shi)用(yong)(yong)(yong)(yong)(yong)硅(gui)油(you)(you)(you)(you)的(de)(de)擴(kuo)(kuo)散泵(beng)(beng)被(bei)廣泛(fan)用(yong)(yong)(yong)(yong)(yong)在(zai)(zai)(zai)電子(zi)(zi)(zi)(zi)、電氣(qi)(qi)及(ji)金屬加(jia)(jia)工等要(yao)求(qiu)高(gao)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)系統(tong)的(de)(de)領域，如顯像(xiang)管(guan)(guan)、燈(deng)泡、大功率電子(zi)(zi)(zi)(zi)管(guan)(guan)、微(wei)(wei)波(bo)電子(zi)(zi)(zi)(zi)管(guan)(guan)、原子(zi)(zi)(zi)(zi)能(neng)加(jia)(jia)速(su)器、電子(zi)(zi)(zi)(zi)顯微(wei)(wei)鏡、半導體元(yuan)件(jian)、集成電路(lu)、電子(zi)(zi)(zi)(zi)部(bu)件(jian)、金屬真(zhen)(zhen)(zhen)空(kong)(kong)(kong)鍍(du)膜、真(zhen)(zhen)(zhen)空(kong)(kong)(kong)冶(ye)金、加(jia)(jia)工鍛燒(shao)裝(zhuang)置及(ji)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)蒸(zheng)(zheng)餾等部(bu)門(men)。