CN109180191A - 改进硅碳棒冷端部电阻率的方法 - Google Patents
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Abstract
改进硅碳棒冷端部电阻率的方法涉及一种改进硅碳棒冷端部电阻率的方法。主要是为解决目前硅碳棒冷端部电阻率大的问题而发明的。用甲基纤维素和聚乙烯醇作为结合剂；粉料为碳化硅粉，石墨粉、木粉、水；各原料的重量比为：甲基纤维素2kg，聚乙烯醇2kg，碳化硅粉52kg,石墨粉40kg,木粉4kg,水20kg。把各原料在混料锅中混合，用液压机挤压成型，生坯晾晒48小时，在烘干箱内烘干10个小时，烘干温度为170℃，保温4个小时，开始渗硅，金属硅的重量是生坯的1.2倍，渗硅温度是1850℃，在冷端部内孔灌满金属硅料，把生坯用硅粒埋起来，最后上方铺一层硅粒，反应时间为170分钟。优点是硅碳棒冷端部电阻率小。
Description
技术领域：
本发明涉及一种改进硅碳棒冷端部电阻率的方法。
背景技术：
目前硅碳棒冷端部是由沥青做结合剂，加入石墨粉和碳化硅混合后挤压成型制作的，需要在电阻炉上用埋烧法烧成。
电阻炉炉蕊体是由石墨电极粉加少量水捣制而成的。电阻炉炉蕊实际上就是电热元件的发热部，其两端与石墨电极相连接，石墨电极的直径是Φ400mm，长度是1000mm，电阻率是5×10-6Ωm。石墨电极是实心体，石墨电极棒作为电热元件的冷端部，炉蕊体的尺寸是11米×0.2米×0.4米，是长方体，两头冷端部加的是220V交流电压。发热体的功率是400kw，单相电，二次最大允许电流1818A。
埋烧法首先配制焙烧料，焙烧料是由碳化硅与石英砂二者混合而成，它们的重量比是70：40；然后用焙烧料把冷端部埋起，一层焙烧料一层冷端部，一焙烧层料一层冷端部，焙烧料层厚度是30mm，冷端部内孔也要灌满焙烧料。最上方盖的焙烧料的厚度是100mm。烧成时间是24小时，烧成温度是2200℃，让冷端部内的碳与石英砂在高温下发生反应，生成碳化硅；冷却48小时，然后取出产品。用这种方法生产出来的冷端部电阻率是400Ωmm2/m，接上发热体后的比电阻达到了6：1，按机械部颁标准规定的比电阻为12：1，这些冷端部的电阻率都大，属于不合格品。
发明内容：
本发明所要解决的技术问题是提供一种改进硅碳棒冷端部电阻率的方法，按本方法得到的硅碳棒消耗在冷端部上的功率少，绝大多数的能量集中在发热部，这样有利于炉温的提升，节能；能大大提高发热体的使用寿命。
上述目的是这样实现的：生产硅碳棒冷端部用甲基纤维素和聚乙烯醇作为结合剂；
粉料为碳化硅粉（180目），石墨粉（200目）、木粉（60目）、水；
各原料的重量比为：甲基纤维素2kg，聚乙烯醇2kg，碳化硅粉52kg,石墨粉40kg,木粉4kg,水20kg。
首先把各种原料按所述比例在混料锅中混合，混合40分钟后就可以成型，用300吨四柱液压机挤压成型，成型后的生坯先晾晒48小时，然后在烘干箱内烘干10个小时，烘干温度为170℃，在170℃条件下再保温4个小时，就可以渗硅了。渗硅采用的金属硅型号是“441”， 使用的设备为氮气保护的碳管炉，金属硅的重量是生坯重量的1.2倍，渗硅温度是1850℃，推进速度是每分钟20毫米。发热碳管内径是Φ190mm，发热碳管电阻率是9×10-6Ωm；冷端部碳管电阻率是6×10-6Ωm，渗硅功率是110kw，在冷端部内孔灌满金属硅料，称好重量后，把生坯用硅粒埋起来，一层冷端套管一层硅粒，最后上方铺一层硅粒。这些物料都装在石墨舟里。金属硅的粒度是1-3毫米，化学反应方程式是C+si =sic。反应时间为170分钟，渗硅完成。
本发明的优点是：按本方法得到的硅碳棒冷端部的电阻率在18-24Ωmm2/m，接上发热体后的比电阻为12：1---15：1。这样消耗在冷端部上的功率非常少，绝大多数的能量集中在发热部，有利于炉温的提升，非常节能，能大大提高发热体的使用寿命，降低客户的生产成本。
具体实施方式：
生产硅碳棒冷端部用甲基纤维素和聚乙烯醇作为结合剂；
粉料为碳化硅粉（180目），石墨粉（200目）、木粉（60目）、水；
各原料的重量比为：甲基纤维素2kg，聚乙烯醇2kg，碳化硅粉52kg,石墨粉40kg,木粉4kg,水20kg。
首先把各种原料按所述比例在混料锅中混合，混合40分钟后就可以成型，用300吨四柱液压机挤压成型，成型后的生坯先晾晒48小时，然后在烘干箱内烘干10个小时，烘干温度为170℃，在170℃条件下再保温4个小时，就可以渗硅了。渗硅采用的金属硅型号是“441”， 使用的设备为氮气保护的碳管炉，金属硅的重量是生坯重量的1.2倍，渗硅温度是1850℃，推进速度是每分钟20毫米。发热碳管内径是Φ190mm，发热碳管电阻率是9×10-6Ωm；冷端部碳管电阻率是6×10-6Ωm，渗硅功率是110kw，在冷端部内孔灌满金属硅料，称好重量后，把生坯用硅粒埋起来，一层冷端套管一层硅粒，最后上方铺一层硅粒。这些物料都装在石墨舟里。金属硅的粒度是1-3毫米，化学反应方程式是C+si =sic。反应时间为170分钟，渗硅完成。
Claims (1)
1.改进硅碳棒冷端部电阻率的方法，其特征是：
生产硅碳棒冷端部用甲基纤维素和聚乙烯醇作为结合剂；
粉料为碳化硅粉，石墨粉、木粉、水；
各原料的重量比为：甲基纤维素2kg，聚乙烯醇2kg，碳化硅粉52kg,石墨粉40kg,木粉4kg,水20kg；
首先把各种原料按所述比例在混料锅中混合，混合40分钟后用四柱液压机挤压成型，成型后的生坯先晾晒48小时，然后在烘干箱内烘干10个小时，烘干温度为170℃，然后在170℃条件下再保温4个小时，就可以渗硅了；渗硅采用的金属硅型号是“441”， 使用的设备为氮气保护的碳管炉，金属硅的重量是生坯重量的1.2倍，渗硅温度是1850℃，推进速度是每分钟20毫米；发热碳管内径是Φ190mm，发热碳管电阻率是9×10-6Ωm；冷端部碳管电阻率是6×10-6Ωm，渗硅功率是110kw，在冷端部内孔灌满金属硅料，称好重量后，把生坯用硅料埋起来，一层冷端套管一层硅粒，最后上方铺一层硅料，这些物料都装在石墨舟里，反应时间为170分钟，渗硅完成。
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1994968A (zh) * | 2006-12-15 | 2007-07-11 | 湖南大学 | 一种再结晶碳化硅制品的制备技术 |
| CN103449817A (zh) * | 2012-05-30 | 2013-12-18 | 辽阳宏图碳化物有限公司 | 一种硅碳棒冷端及其生产方法 |
| CN105837217A (zh) * | 2016-03-24 | 2016-08-10 | 山东奥昱翔碳化硅科技有限公司 | 硅碳棒及其制备方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1994968A (zh) * | 2006-12-15 | 2007-07-11 | 湖南大学 | 一种再结晶碳化硅制品的制备技术 |
| CN103449817A (zh) * | 2012-05-30 | 2013-12-18 | 辽阳宏图碳化物有限公司 | 一种硅碳棒冷端及其生产方法 |
| CN105837217A (zh) * | 2016-03-24 | 2016-08-10 | 山东奥昱翔碳化硅科技有限公司 | 硅碳棒及其制备方法 |
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