A method for increasing the life of quartz crucibles for rcz

Abstract

The invention relates to a method for increasing the service life of a quartz crucible for RCZ, comprising setting a circle of steps (72) on the inner side of the upper edge of a carbon-carbon crucible (7), and setting a circle of crucible side recesses on the steps (72) Groove (73), and on the upper edge of the quartz crucible (6), connect a crucible block (61) curled outwards. The vertical section of the crucible block (61) is L-shaped, and the flat surface of the crucible block (61) The straight section (61a) is connected to the upper edge of the quartz crucible (6), and the vertical section (61b) just fits downward into the groove (73) of the crucible side; finally, it is 40mm away from the upper edge of the carbon crucible side (7). Make one group of diameters on the carbon crucible side (7) and be a through hole (71) of 5mm, the through hole (71) is located at the same level and can pass through the inner wall to be connected with the crucible side groove (73). The invention has the advantages of effectively dredging the generated gas, avoiding the crucible bulging, and fixing the upper edge of the crucible in one direction, preventing edge collapse, prolonging the service life of the quartz crucible, and ensuring normal crystal pulling.

Description

technical field [0001] The invention relates to the technical field of photovoltaic manufacturing, in particular to a method for increasing the service life of a quartz crucible for RCZ. Background technique [0002] In the multi-feeding and pulling of solar-grade monocrystalline silicon, that is, RCZ, the commonly used quartz crucible is a straight-arm structure, covered with carbon-carbon crucible sides on the outside, with an external guide tube inside, and the crucible is placed directly on the graphite crucible holder below. Above, the graphite crucible holder is connected to the bottom of the carbon-carbon crucible side. [0003] In the current production process of solar-grade monocrystalline silicon, since the quartz crucible and the carbon-carbon crucible have straight wall structures, the quartz crucible is easy to collapse and bulge after heating and softening, and the supporting rod can move up and down vertically. The upper edge is easy to be roasted and deform...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the existing quartz crucibles such as sagging, curling and easy bulging, and to provide a method for increasing the service life of the RCZ quartz crucible, which can not only effectively dredge the generated gas, but also avoid the occurrence of crucible bulging , and can also fix the upper edge of the crucible in one direction, prevent the edge from collapsing and curling, prolong the service life of the quartz crucible, and ensure normal crystal pulling

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