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大家知道,工件在箱式炉中加热时,传热方式有两种,一种是对流,一种是辐射。而由炉壁辐射传热占工件吸热的60％,若提高炉壁的辐射率,将提高炉子的加热效率。碳化硅(绿色)具有辐射率高(约为0.9;而粘土砖为0.75),而且有较高的耐热、耐急冷性能和高的耐火度。因此,我们采用在箱式电炉的炉墙上刷上一层碳化硅涂料,来提高其辐射率。具体做法是:1.清扫炉膛内炉墙,不得留有灰尘,以免碳化硅涂料粘结不牢。
We all know that the workpiece in the box furnace heating, the heat transfer there are two ways, one is convection, one is radiation. While the heat transfer from the furnace wall account for 60% of the workpiece heat, if the furnace wall to improve the emissivity, will increase the furnace heating efficiency. Silicon carbide (green) has a high emissivity (about 0.9; clay brick is 0.75), and has high heat, quench resistance and high refractoriness. Therefore, we use a silicon carbide coating on the wall of the box furnace to increase its emissivity. The specific approach is: 1. To clean the furnace wall, not leave dust, so as not to bond the silicon carbide coating is not strong.