用插入式热电偶测量铁水温度时,通常是用石英管作为热电偶的外保护管。但石英管抗渣性特别是抗氧化铁侵蚀性较差,一般石英管使用六次左右(每次插入时间约30秒),很明显的看到表面已被侵蚀成一层层的鳞片状,严重的降低了它的使用寿命。为使石英管不受损坏,在石英管外面加一层石墨保护管, Thermocouple with a thermocouple temperature measurement is usually used as a quartz tube thermocouple protection tube. However, quartz tube slag resistance, especially iron oxide corrosion is poor, the general use of quartz tube about six times (each insertion time of about 30 seconds), it is clear that the surface has been eroded into a layer of scales, serious Reduces its useful life. In order to make the quartz tube undamaged, add a layer of graphite protection tube outside the quartz tube,