Graphite insulation tube is mainly used in graphite crystal thermal field system of single crystal furnace. In fact, it is a heat shield according to this standard, and heat shields are used more frequently in thermal field systems. It can be divided into upper insulation cover, middle insulation cover and lower insulation cover. . Graphite carbon felt is wrapped around the insulation tube and becomes a heat shield. In general, the number of layers wrapped by graphite carbon felt depends on the actual process and customer requirements.
In the graphite crystal thermal field system installed in a single crystal furnace, the upper heat screen, the middle heat screen and the lower heat screen have different installation positions and functions. The role of the middle and upper heat shields is also to reduce heat loss. It is just that the number of layers of graphite carbon felt outside the insulation cover is different, which results in different temperature gradients. The lower heat shield forms the bottom heat insulation system, and its role is to strengthen the bottom heat insulation, increase the bottom temperature and reduce heat loss.
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