工艺参数对微波硬化水玻璃砂溃散性影响的试验研究

采用微波加热技术硬化水玻璃砂,用电阻炉加热模拟型芯在铸造过程中的受热情况,测试砂型试样的溃散性,分析水玻璃加入量和水玻璃模数对微波硬化水玻璃砂残留强度的影响规律。结果表明,在微波加热功率为539 W、微波加热时间为20 min、电阻炉中保温时间为10 min的条件下,当水玻璃加入量在5.0%~2.0%范围内,每下降1.0%时,砂型试样的残留强度平均值下降约5.0%;水玻璃的模数由2.3增加到2.5时,砂型的残留强度平均值有所降低。采用微波加热新工艺提高了水玻璃的粘接效率,降低了水玻璃的加入量,改善了水玻璃砂的溃散性。

Effect of Technical Parameters on Collapsibility of Sodium Silicate-bonded Sand Cured by Microwave Heating

The sodium silicate-bonded sands were cured by microwave heating and the thermal conditions of the cores in casting process were simulated by heating in resistance furnace.The collapsibility of the samples was measured and the influence of adding content and the modulus of sodium silicate on the residual strength was studied and analyzed in this investigation.The results shows that when the microwave heating power,microwave heating time and holding time in resistance furnace are 539 w,20 min and 10 min respectively,the average residual strength of the samples decrease about 5.0% with 1.0% decrease of the content of sodium silicate in the range from 5.0% to 2.0%,and the arudimental strength was decreased eventually with modulus decreasing from 2.3 to 2.5.The adhesive efficiency of sodium silicate bonded sands cured by this new technology of microwave heating improve,the addition of water-glass is reduced so that the collapsibility improve obviously.