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height:6000px;'></div> <div id="zbbbnpu2h4x" class="Top w100"> <div id="zbbbnpu2h4x" class="w1000"> <div id="zbbbnpu2h4x" class="meau"> <span id="zbbbnpu2h4x" class="m1"></span> <span id="zbbbnpu2h4x" class="m2"></span> <span id="zbbbnpu2h4x" class="m3"></span> </div> <div id="zbbbnpu2h4x" class="Logo fl"><h1></h1></div> <div id="zbbbnpu2h4x" class="toptel"></div> <div id="zbbbnpu2h4x" class="clear"></div> </div> <div id="zbbbnpu2h4x" class="Nav w100"> <div id="zbbbnpu2h4x" class="Navlist w1000"> <ul> <li id="Top1"></li> </ul> <div id="zbbbnpu2h4x" class="clear"></div> </div> <div id="zbbbnpu2h4x" class="clear"></div> </div> <div id="zbbbnpu2h4x" class="clear"></div> </div> <div id="zbbbnpu2h4x" class="blockindex h450"> <div id="zbbbnpu2h4x" class="new9"> <div id="zbbbnpu2h4x" class="new91"> <h1>簡(jiǎn)述氫氧氮分析儀注意事項(xiàng)及鋼中氧氮?dú)湮：?/h1> 發(fā)布時(shí)間：2024-05-30 </div> <div id="zbbbnpu2h4x" class="new92"> <div class="zbbbnpu2h4x" id="contentt"></div> 簡(jiǎn)述氫氧氮分析儀注意事項(xiàng)及鋼中氧氮?dú)湮：?<br>氫氧氮分析儀用于金屬、礦石等無(wú)機(jī)材料中氧、氮、氫元素含量的測(cè)定。又名氧氮?dú)浞治鰞x、氮?dú)溲趼?lián)測(cè)儀、氧氮?dú)渎?lián)合測(cè)定儀。包括：氧分析儀（定氧儀）、氫分析儀（測(cè)氫儀）、氮分析儀（氮測(cè)定儀）、氧氮分析儀（氧氮聯(lián)測(cè)儀）、氧氮?dú)浞治鰞x、擴(kuò)散氫分析儀等。因?yàn)檠醯獨(dú)涠际菤怏w元素，在金屬中含量很低，其性質(zhì)又相對(duì)較活波，所以測(cè)量難度很大。然而氧氮?dú)鋵?duì)許多材料又屬于有害元素。下文以氧氮?dú)鋵?duì)鋼鐵的影響為例，來(lái)解釋為何要用到氫氧氮分析儀。 <br>鋼中氧氮?dú)涞奈：Γ?<br>氧在鋼中是有害元素。它是在煉鋼過(guò)程中自然進(jìn)入鋼中的，盡管在煉鋼末期要加入錳、硅、鐵和鋁進(jìn)行脫氧，但不可能除盡。鋼水凝固期間，溶液中氧和碳反應(yīng)會(huì)生成一氧化碳，可以造成氣泡。氧在鋼中主要以feo、mno、sio2、al2o3等夾雜形式存在，使鋼的強(qiáng)度、塑性降低。尤其是對(duì)疲勞強(qiáng)度、沖擊韌性等有嚴(yán)重影響。氧會(huì)使硅鋼中鐵損增大，磁導(dǎo)率及磁感強(qiáng)度減弱，磁時(shí)效作用加劇。 <br>氮對(duì)鋼材性能的影響與碳、磷相似，隨著氮含量的增加，可使鋼材的強(qiáng)度顯著提高，塑性特別是韌性也顯著降低，可焊性變差，冷脆性加?。煌瑫r(shí)增加時(shí)效傾向及冷脆性和熱脆性，損壞鋼的焊接性能及冷彎性能。因此，應(yīng)該盡量減小和限制鋼中的含氮量。一般規(guī)定氮含量應(yīng)不高于0.018%。氮在鋁、鈮、釩等元素的配合下可以減少其不利影響，改善鋼材性能，可作為低合金鋼的合金元素使用。有些牌號(hào)的不銹鋼，適當(dāng)增加n的含量，可以減少cr的使用量，可以有效降低成本。 <br>氫是一般鋼中害的元素，鋼中溶有氫會(huì)引起鋼的氫脆、白點(diǎn)等缺陷。氫與氧、氮一樣，在固態(tài)鋼中溶解度極小，在高溫時(shí)溶入鋼液，冷卻時(shí)來(lái)不及逸出而積聚在組織中形成高壓細(xì)微氣孔，使鋼的塑性、韌度和疲勞強(qiáng)度急劇降低，嚴(yán)重時(shí)會(huì)造成裂紋、脆斷?！皻浯唷敝饕霈F(xiàn)在馬氏體鋼中，在鐵氧體鋼中不十分突出，一般與硬度和含碳量一起增加。 <br>另一方面，h能提高鋼的磁導(dǎo)率，但也會(huì)使矯頑力和鐵損增加（加h后矯頑力可增大0.5～2倍）。 <br>基于無(wú)機(jī)物中氧氮?dú)湓睾繙y(cè)定難度大、儀器研發(fā)成本高而市場(chǎng)需求量較低，目前市場(chǎng)上生產(chǎn)氫氧氮分析儀的廠家不多，能做好的更是。我們?cè)谶M(jìn)行氧含量分析尤其是微量氧分析時(shí)，由于空氣中氧含量高達(dá)21%，故而如果處理不當(dāng)極易造成對(duì)樣品的污染和干擾，出現(xiàn)分析結(jié)果數(shù)據(jù)不正確。其主要原因是氧氮分析儀操作不當(dāng)造成。以下僅談幾點(diǎn)影響測(cè)定的因素。 <br>氧氮?dú)浞治鰞x注意事項(xiàng)： <br>1、泄漏。氧氮分析儀在初次啟用前必須嚴(yán)格檢漏。儀器只有在嚴(yán)密不漏的前提下才能獲得準(zhǔn)確的數(shù)據(jù)結(jié)果。任何連接點(diǎn)，焊點(diǎn)，閥門(mén)等處的不嚴(yán)密，將會(huì)導(dǎo)致空氣中的氧反滲進(jìn)入管道及儀器內(nèi)部，從而得出含氧量偏高的結(jié)果。 <br>2、污染。在重新使用儀器時(shí)，首先須注意在連接取樣管路時(shí)是否漏入空氣。并且必須認(rèn)真將漏入的空氣吹除干凈，盡量不使大量氧氣通過(guò)傳感器以延長(zhǎng)傳感器壽命。在管道系統(tǒng)凈化過(guò)程中，為縮短凈化時(shí)間，需要有一定的方法，一般使用高壓放氣及小流量吹除交替進(jìn)行可迅速凈化管道。 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