Many people think that the higher the vacuum degree of vacuum induction furnace, workpiece processing effect is better, actually otherwise, the vacuum degree of vacuum furnace should be based on the workpiece and the kinds of materials to decide, only chose the proper vacuum degree, will receive good effect.
When the pressure is less than the temperature of the vapor pressure, metal can produce evaporation (sublimation) phenomenon, like camphor in air by sublimation from solid evaporate into a gas. The smaller the outside pressure, the vacuum degree is higher, the easier it is to evaporate. So in vacuum heat treatment furnace, due attention must be paid to the problem of evaporation, think as long as to improve the vacuum degree of vacuum furnace, can achieve good effect of view is not comprehensive, must according to the types of artifacts, full attention to the problem of evaporation. Namely according to the alloy elements in the material being processed in the vacuum furnace of vapor pressure and heating temperature, to select the appropriate vacuum degree, in order to prevent the vacuum evaporation of alloy elements. As long as the vacuum degree of vacuum furnace choice is appropriate, is to prevent evaporation of alloy elements.
When heated in vacuum furnace, also can consider according to the types of metal materials, ventilation with inert gases, high purity or reverse gas to adjust the vacuum furnace, with a low vacuum heating method to prevent evaporation of the alloying elements, ventilation with high purity of inert gas can not only adjust the vacuum degree, and as a result of the existence of inert gas, form convection circulation, more conducive to the material evenly heating.
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