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不久前,我厂将一台熔模铸钢件使用的75千瓦箱式正火炉进行改装,粘贴耐火纤维板节能,取得了很好的效果。 国产耐火纤维的原料大部分采用天然焦宝石,其中Al_2O_3和SiO_2的含量大致为1:1,Al_2O_3和SiO_2大于96％,其余为杂质Fe_2O_3、Na_2O、K_2O和B_2O_3。由于杂质较多,大于950℃时,纤维会发生过份收缩,并逐渐粉化,使保温效果下降或失效,故正常使用温度不宜超过950℃。我厂熔模铸钢件的正火温度为850～900℃,能满足使用要求。
Not long ago, our factory converted a 75-kilowatt box-type normalizing furnace used for investment casting steel parts, and pasted fire-resistant fiberboard to save energy and achieved good results. Most of the raw materials of domestic refractory fibers use natural coke stones, in which the content of Al 2 O 3 and SiO 2 is about 1: 1, Al 2 O 3 and SiO 2 are more than 96%, and the rest are impurities such as Fe 2 O 3, Na 2 O, K 2 O and B 2 O 3. As more impurities, greater than 950 ℃, the fiber will be excessive shrinkage and gradually chalking, so that the insulation effect of decline or failure, so the normal temperature should not exceed 950 ℃. I plant cast steel casting normalizing temperature of 850 ~ 900 ℃, to meet the requirements.