<p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:=""><img style="max-width:710px" style="max-width:710px" src="" title="37708.jpg" alt="圖片_200_副本.jpg"/></p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">鄭州銘鑫硅碳棒的電氣性能</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">?碳化硅加熱管具有較大的比電阻，在空氣中通電加熱，發(fā)熱部表面溫度1050±50℃時(shí)，電阻率為600-1400Ω-mm2/M.硅碳棒的電阻隨溫度升高而變化，從室溫到800℃。電阻-溫度特征曲線為負(fù)值，溫度800℃為正值。</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">
</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">硅碳棒表面負(fù)荷</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">硅碳棒表面負(fù)荷=額定功率/發(fā)熱部表面積（W/cm2）</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">? ?硅碳棒表面負(fù)荷大小與其使用壽命長(zhǎng)短關(guān)系很大，因此，在通電加熱時(shí)要嚴(yán)格控制在允許負(fù)荷范圍之內(nèi)，切忌超負(fù)荷使用。</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">? ?硅碳管發(fā)熱部表面溫度與相應(yīng)爐溫下，發(fā)熱部單位表面允許負(fù)荷如上表。</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">
</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">氣氛對(duì)硅碳棒的影響</p><p style="text-size-adjust: ; margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102); font-family: " trebuchet="" helvetica="" background-color:="">? ?爐內(nèi)氣氛對(duì)硅碳棒電熱元件的使用壽命有重要影響，硅碳棒在使用過(guò)程中逐步產(chǎn)生SiO2，分隔SiC結(jié)晶顆粒，局部電阻增大、體積膨脹，直至后斷裂。</p><p style="margin-top: 0px; margin-bottom: 0.75em; white-space: normal; box-sizing: border-box; color: rgb(102, 102, 102);" trebuchet="" helvetica="" background-color:="">硅碳棒電熱元件在干燥潔凈空氣中連續(xù)使用（1450℃）壽命可達(dá)2000小時(shí)。</p>

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