Thermostructural composite material bowl
a composite material and composite material technology, applied in the direction of rigid pipes, solid state, gel state, etc., can solve the problems of increasing the mass of liquid, increasing the cost of the liquid, and fragile pieces of graphite used as bowls. achieve the effect of low cos
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[0048] As already mentioned, a non-limiting example to which the invention applies is that of making bowls of thermostructural composite material for supporting crucibles in installations that produce single crystal silicon ingots.
[0049] Highly diagrammatic FIG. 1 shows such a bowl of composite material, e.g. C / C composite material supporting a crucible 5 which is usually made of silica. The bowl 1 stands on an annular support formed with a ring 2 mounted at the end of a shaft 3 having a setback 4 therein. The bowl has a bottom portion 1a and a surround portion 1b, part of which is substantially cylindrical and is connected to the bottom portion via a region of rounded profile. The bottom portion of the bowl 1 is machined so as to form a centering bearing surface corresponding to the setback 4 and a support surface on the ring 2.
[0050] After the crucible has been filled with silicon, the assembly is placed in a furnace and the temperature in the furnace is raised to a value which is...
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