| The degassing of Al melts, an essential part of Al foundry practice, has often an unpredictable result, as the effects of many factors are not well known. The effects of Mg content, initial gas content, amount of degassing tablets and moisture content of the air on C₂Cl_6 - tablet degassing of AlSi7Mg melt were investigated. The degassing efficiency decreases rapidly with increasing Mg content up to 0.1% and then remains constant. And it becomes gradually worse when the amount of degassing tablets for one plunging increases. The experimental results were analyzed statistically and an equation, C₂＝C₁exp(-kd), was formulated, to calculate the gas content C, after a degassing treatment with C₂Cl_6-tablet d, where k is a function of Mg content. |
|
