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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="3xriul4" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/zbwuzi/637238605112548828/9992145.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="utqifhw" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>山東省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>湖北鋁行業(yè)碳化硅結(jié)合氮化硅廠家</p><p><span>***更新：</span>2020-06-22 16:20:36</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="2ebo3uw" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">鄒平縣奧翔硅碳制品有限公司</a></p><p><span>聯(lián)系人：</span>張洪恩</p><p><span>郵箱: </span>13884861614@163.com</p><p><span>電話: </span>13884861614</p><p><span>傳真: </span>0543_4534117</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>0543-4533667</p><p><span>地址: </span>山東省鄒平市臨池鎮(zhèn)望京村</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="ynfmel4" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="eyvszgf" class="box"><p><p> 氮化硅結(jié)合碳化硅在氮化爐中燒制時(shí)，我們對(duì)氮化硅材料氮化燒結(jié)環(huán)境下的研究認(rèn)為在燒成反應(yīng)中存在著間接反應(yīng)和直接反應(yīng)。在反應(yīng)中，作為反應(yīng)的參與者，N2的分壓起著極為重要的作用，但不論氮分壓的大小如何，只要生產(chǎn)Si3N4，湖北鋁行業(yè)碳化硅結(jié)合氮化硅廠家，那么在坯體內(nèi)就存在著N2的濃度梯度和生成Si3N4的濃度梯度，而且這種濃度梯度的方向是相同的，越是接近坯體表面其兩個(gè)組分的濃度越高。要想反應(yīng)不斷向坯體內(nèi)部推進(jìn)就必須確保合適的氮分壓和反應(yīng)溫度，湖北鋁行業(yè)碳化硅結(jié)合氮化硅廠家。在純Si3N4的氮化燒結(jié)中，通常會(huì)發(fā)生“流硅”反應(yīng)而使氮化反應(yīng)受到影響，這是因?yàn)榈磻?yīng)是一個(gè)放熱反應(yīng)，為使反應(yīng)完全又將Si粉的粒徑控制在很小范圍內(nèi)，這樣在氮化過程中若控制不當(dāng)時(shí)，供給熱量和生成熱量疊加而使溫度達(dá)到了硅的熔點(diǎn)使Si粉熔化而產(chǎn)生所謂的“流硅”現(xiàn)象，湖北鋁行業(yè)碳化硅結(jié)合氮化硅廠家。在氮化硅結(jié)合碳化硅的氮化燒結(jié)中，Si粉的濃度含量相對(duì)較低，而濃度較高的SiC又有著較大的導(dǎo)熱率從而了“流硅”現(xiàn)象的發(fā)生。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖北鋁行業(yè)碳化硅結(jié)合氮化硅廠家" src="https://tyunfile.71360.com/UploadFile/zbwuzi/637238605112548828/9992145.jpg"></div><p> 也就是由窯爐內(nèi)的N2的消耗量和爐壓來控制和檢驗(yàn)氮化率，它決定了升溫速度。在氮壓控制燒成中，不需要規(guī)定嚴(yán)格的升溫制度，而是預(yù)先設(shè)定標(biāo)準(zhǔn)爐壓，再根據(jù)爐壓變化來調(diào)整氮化工藝參數(shù)。氮化開始時(shí)，在一定時(shí)間間隔內(nèi)，如果實(shí)測(cè)爐壓等于控制壓時(shí)，說明氮化反應(yīng)穩(wěn)定進(jìn)行，爐溫不變；如果爐壓小于控制壓，而爐壓連續(xù)下降，說明氮化反應(yīng)劇烈，應(yīng)將爐溫下調(diào)；如果爐壓上升至大于控制壓時(shí)，說明氮化反應(yīng)基本達(dá)到平衡，窯爐內(nèi)開始升溫，直到檢測(cè)到下一次爐壓下降，這樣的一種循環(huán)工藝操作以表象上的準(zhǔn)靜態(tài)、實(shí)質(zhì)上連續(xù)的動(dòng)態(tài)平衡可使氮化反應(yīng)高速進(jìn)行。氮化硅結(jié)合碳化硅制品氮化燒結(jié)的主要影響因素是氮化反應(yīng)的時(shí)間，而兩級(jí)保溫之間的溫度大小和氮化燒結(jié)**終溫度的高低使這兩個(gè)因子對(duì)試樣增重率的影響相對(duì)較大。經(jīng)過我們?cè)囼?yàn)分析對(duì)在氮化硅結(jié)合碳化硅材料的氮化燒結(jié)過程中有以下幾點(diǎn)：1.適當(dāng)提高反應(yīng)起始溫度，加速初始氮化反應(yīng)，不會(huì)造成“流硅”現(xiàn)象。2.在反應(yīng)中溫區(qū)，可適當(dāng)加大兩級(jí)保溫之間的溫差，加速中溫區(qū)的反應(yīng)速率。3.比較高燒成溫度可在較大的范圍內(nèi)波動(dòng)，不像液相燒結(jié)陶瓷制品時(shí)那么嚴(yán)格。因此可采用較高的氮化溫度加速高溫氮化反應(yīng)。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖北鋁行業(yè)碳化硅結(jié)合氮化硅廠家" src="http://tyunfile.71360.com/UpLoadFile/2019/7/27/16/636998403242635286_zbwuzi_7922021.jpg"></div><p> 氮化硅結(jié)合碳化硅復(fù)合材料在氮化燒成時(shí)，制品由表及里存在N2和反應(yīng)生成物的濃度梯度，它們的方向相同。氮化硅結(jié)合碳化硅復(fù)合材料在氮化燒成中，爐內(nèi)N2的消耗量與溫度形成一種表面平衡狀態(tài)，但實(shí)質(zhì)上是硅被不斷氮化的連續(xù)過程。通過對(duì)窯爐內(nèi)氮分壓的控制來實(shí)施對(duì)窯爐升溫的控制，也就對(duì)氮化反應(yīng)速度實(shí)施了控制，從而避免了燒成中的微觀結(jié)構(gòu)缺點(diǎn)，能夠制得由外到里氮化率梯度趨近于零的產(chǎn)品。所謂氮壓控制燒成就是氮化硅結(jié)合碳化硅制品在窯爐中氮化燒成時(shí)，表現(xiàn)為：在微觀上是不斷進(jìn)行的氮與硅的反應(yīng)，達(dá)到一種動(dòng)態(tài)平衡；在宏觀上是以氮分壓，也就是由窯爐內(nèi)的N2的消耗量和爐壓來控制和檢驗(yàn)氮化率，它決定了升溫速度。在氮壓控制燒成中，不需要規(guī)定嚴(yán)格的升溫制度，而是預(yù)先設(shè)定標(biāo)準(zhǔn)爐壓，再根據(jù)爐壓變化來調(diào)整氮化工藝參數(shù)。氮化開始時(shí)，在一定時(shí)間間隔內(nèi)，如果實(shí)測(cè)爐壓等于控制壓時(shí)，說明氮化反應(yīng)穩(wěn)定進(jìn)行，爐溫不變；如果爐壓小于控制壓，而爐壓連續(xù)下降，說明氮化反應(yīng)劇烈，應(yīng)將爐溫下調(diào)；如果爐壓上升至大于控制壓時(shí)，說明氮化反應(yīng)基本達(dá)到平衡，窯爐內(nèi)開始升溫，直到檢測(cè)到下一次爐壓下降。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/351708.html</p></div></div></div></div></div><div id="cmjgyp4" class="page-right 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