Vacuum Resistance

The vacuum resistance of refractories refers to the durability of refractories when used in vacuum and high temperature. When refractories are used at high temperature and pressure, some of them are volatile, and the reaction between components and media is easy. In addition, in vacuum, the penetration rate of slag along the capillary of the material is obviously accelerated. Therefore, when many materials are used in vacuum, the durability is reduced. When refractories are used in vacuum melting furnaces and other vacuum treatment devices, their vacuum resistance must be investigated.

To improve the vacuum resistance of refractories, compounds with low vapor pressure and good chemical stability should be selected to form the composition of the materials, in addition, increasing the density of the materials is also conducive to the improvement of their vacuum resistance.

No standard test method has been established to determine the vacuum resistance of refractories. Most of the methods are used to measure the vacuum resistance of refractories after a certain period of time by calculating the mass loss or the speed of mass loss.