<p><span style="font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" font-size:="" font-weight:="" background-color:="">原裝美國(guó)道康寧真空泵油DC704高真空硅油19.3kg擴(kuò)散泵油702/705</span></p><p><span style="font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" font-size:="" font-weight:="" background-color:=""><span style="font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" font-size:="" font-weight:="" background-color:="">美國(guó)道康寧DC705擴(kuò)散泵硅油DOW CORNING真空泵油</span></span></p><p><br/></p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">高真空技術(shù)中使用的擴(kuò)散泵油，要求耐熱氧化性，冷卻溫度下蒸氣壓低，且其蒸氣壓隨溫度變化大，沸騰溫度不能過高。目前主要使用礦油類、酯類、聚苯醚及硅油等。其中以硅油的性能，它具有熱氧化穩(wěn)定性高、粘溫系數(shù)小、沸點(diǎn)范圍窄、蒸氣壓曲線陡（溫度變化一點(diǎn)，蒸氣壓變化很大），常溫蒸氣壓低，凝固點(diǎn)低，加之化學(xué)惰性，、無味、無腐蝕。因而它可在250℃下長(zhǎng)時(shí)間使用，在真空下允許在更高溫度下使用。&nbsp;</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;當(dāng)前各國(guó)使用的擴(kuò)散泵硅油主要仍是DOW CORNING公司開發(fā)的下列兩種：DC-704和DC-705。使用上述硅油可獲得1.333×10-7~1.333×10-11kPa（無阱條件下）及1.333×10-10~1.333×10-12kPa。&nbsp;</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;DOW CORNING擴(kuò)散泵油是為高真空和在生產(chǎn)作業(yè)中快速對(duì)大容積氣體抽真空而設(shè)計(jì)的，國(guó)內(nèi)95%以上的進(jìn)口擴(kuò)散泵用DOW CORNING的擴(kuò)散泵硅油。&nbsp;</p><p><br style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; display: block; content: " font-family:="" helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:=""/></p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:=""><span style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; font-weight: 700;">特點(diǎn)：</span></p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">縮短調(diào)節(jié)運(yùn)行時(shí)間；</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">單一組分硅油比用多組分硅油達(dá)到真空度需要的時(shí)間短得多；</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">快速抽空；</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">極小的回流，DOW CORNING單一組分硅油的蒸汽壓力是很低的，以至對(duì)于許多應(yīng)用阱或現(xiàn)存的阱致冷是不需要的；</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">較長(zhǎng)的服務(wù)壽命；</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">硅油的熱和化學(xué)穩(wěn)定性允許長(zhǎng)久的運(yùn)行而不被惡化和污染；</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">清洗系統(tǒng)維修需求較少；</p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">較快的循環(huán)，減少停機(jī)時(shí)間，更換油的需求少。</p><p><br style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; display: block; content: " font-family:="" helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:=""/></p><p style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); box-sizing: border-box; margin-top: 0px; margin-bottom: 0px; padding: 0px; font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" white-space:="" background-color:="">&nbsp;</p><p><span style="font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" font-size:="" font-weight:="" background-color:=""><span style="font-family: " helvetica="" pingfang="" hiragino="" sans="" microsoft="" font-size:="" font-weight:="" background-color:=""></span></span></p>

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