我厂原用天津耐火器材厂出产的100号石墨坩埚,在自然通风炉中熔化铝合金,每罐熔化时间约2小时,平均使用寿命在22次左右。后来经过一系列试验研究,用塗刷松香的辨法,获得很好的成效,使用寿命提高到45次以上。处理方法如下:将新坩 I plant with the original refractory plant in Tianjin produced 100 graphite crucible, in the natural ventilation furnace melting aluminum alloy, melting time per can about 2 hours, the average life of about 22 times. Later, after a series of experimental studies, with rosin brushing method, get good results, the service life increased to more than 45 times. Treatment is as follows: The new crucible