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作者从理论和实践两个方面,提出了有可能精确控制水玻璃砂吹CO_2硬化过程的资料。这种电位技术是在吹气循环中使用两根埋入砂中的电极,根据电位的变化探测硬化反应,当电位变化最大时,指示为最佳强度。据说这种方法可以用来自动控制CO_2的充气。以水玻璃为粘结剂、并用吹CO_2气体硬化的造型混合料,在铸造生产中得到了广泛的应用。但由于缺泛指示硬化终点的手段,使这种方法的经济性受到减损,不能获得最佳性能。加入化学指示剂(如酚酞、间苯二酚黄000/Ⅱ或百里酚酞)凭光色指示硬化状态的终点
From both theoretical and practical aspects, the author has put forward some data that may be used to precisely control the CO_2 hardening process of sodium silicate sand blowing. This potential technique uses two electrodes embedded in sand during an air blow cycle and detects a hardening reaction based on a change in potential, indicating the best intensity when the change in potential is maximum. It is said that this method can be used to automatically control the inflation of CO2. Water glass as a binder, and blow molding CO 2 gas hardening mixture, in the casting production has been widely used. However, due to a lack of means to indicate the end of hardening, the economy of this method is diminished and the best performance can not be obtained. The addition of a chemical indicator (such as phenolphthalein, resorcinol yellow 000 / II or thymolphthalein) indicates the end of the sclerosing state