Vacuum furnace heat shield
What are the key points for maintenance of vacuum furnace components
Vacuum furnace manufacturer will inevitably have such and such problems for a long time. User friends should also have certain maintenance and repair methods to avoid the small situation of vacuum furnace. Today, Xiaobian will introduce the maintenance instructions of vacuum furnace to you.
Re-calibration of heating power of vacuum furnace is influenced by factors such as the prolongation of furnace service time, the decrease of thermal resistance of heat insulation screen, volatilization of electrothermal components and the increase of resistance, etc., and power should be increased appropriately. In practical production, power is usually determined by empirical calculation, and the relationship between the volume of graphite felt or refractory fiber felt heat shield vacuum furnace and heating power is plotted. According to this figure, 1300 can be determined. C vacuum furnace heating power. If it is a vacuum furnace with a metal heat shield, the heating power needed to be increased by about 30%. High temperature vacuum furnace.
The maintenance of vacuum furnace insulation screen plays an insulating and thermal insulation role in vacuum furnace, and sometimes serves as the structural basis of fixed heater. There are generally four types of vacuum furnace heat shield structure: all-metal heat shield, sandwich heat shield, graphite felt heat shield and mixed felt heat shield. The main points of different heat shields should be mastered in maintenance.
Molybdenum and tungsten materials are usually used in the 1-2 layers near the electrothermal elements of the vacuum furnace, while stainless steel materials are used in the outer layers, and the thickness should be as thin as possible (medium-sized and small-sized furnaces are generally o.2). 0.5mm. The large-scale furnace is o.5-1.Omm, and the surface of the heat shield should be machined into a smooth state before assembling, in order to reduce the blackness and enhance the reflection effect. 1300. The number of heat shield layers of C furnace is generally 5-6 layers, and the distance between layers is 5-10 mm. The contact area of several radiation plates should not be too large to reduce thermal short circuit. The heat shield should be expanded and contracted, and made into a detachable type, so as to facilitate the next maintenance.
Above is the introduction of the maintenance points of vacuum furnace brought to you by Xiaobian. Users must pay attention to the correct method when operating to ensure the quality and service life of vacuum furnace.