Production method of coated crucible

Abstract

The invention provides a production method of a coated crucible. The crucible is an annular hollow net-shaped body formed by braiding one carbon fiber rope or belt; and a production process of the crucible comprises the following step: carrying out a plasma thermal spraying or solid powder solution pre-impregnation and re-sintering step. A crucible top and a crucible bottom of the crucible are prepared by braiding one carbon fiber rope or the plurality of carbon fiber ropes; a needle-punched pre-formed body is not needed and an adhesive is not needed; a processing step of too-long-time vapor phase deposition is not needed, so the working time is saved; the disadvantages that the pre-formed body crucible has poor elasticity and poor fragility are overcome; the thermal deformation stress ofa quartz crucible can be effectively absorbed; meanwhile, the weight of the crucible top of the crucible is greatly reduced and the content of hot melts and impurities of the crucible is reduced; andthe material cost and the application cost are greatly reduced.

Description

technical field [0001] The invention relates to the application of a carbon fiber composite material in the manufacturing process of monocrystalline silicon or polycrystalline silicon, in particular to a method for processing and manufacturing a coated crucible made of carbon fiber composite material weaving. Background technique [0002] In the manufacture of single crystal silicon or polycrystalline silicon, the Czochralski method (CZ method) is commonly used at present, which is a method of pulling a single crystal from a melt along a vertical direction. In manufacturing equipment, one component is the graphite crucible, which is used to hold the quartz crucible inside. During use, due to the different expansion coefficients of the quartz crucible and the graphite crucible, and the corrosion reaction between silicon vapor and graphite, there are problems such as cracking of the graphite crucible and loss of strength due to erosion. Moreover, as the diameter of the crysta...

AI Technical Summary

Problems solved by technology

For example, Patent No. 200910118210.X discloses a crucible holding part of a hollow mesh body, which is braided by multiple strands to form a crucible holding part of a mesh body; The processing steps of high-temperature carbonization and vapor deposition are very time-consuming, but the edges of these crucibles are not strengthened, and there is no surface coating treatment, so the edge of the crucible is very easy to corrode during use, resulting in insufficient strength

In addition, in the prior art method of manufacturing coated crucibles, in an inert atmosphere furnace, different types of gases are introduced according to the type of coating, at a certain temperature, the coating is sintered, and the method of obtaining the crucible is long in production time and difficult to produce. low efficiency and high cost

[0004] Therefore, the manufacture method of the crucible of the prior art also has the place to improve

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