Manufacture method of quartz crucible for casting polycrystalline silicon ingot

Abstract

The invention discloses a manufacture method of a quartz crucible for casting a polycrystalline silicon ingot. The method comprises the following steps of: preparing slurry and forming a blank; carrying out ball milling on partial quartz powder, partial additives containing a polymer monomer and a cross-linked body and all deionized water until required granularity is obtained; then, adding residential quartz powder and residential additives for secondary ball milling to obtain slurry and stirring a proper amount of qualified slurry; injecting an initiator and a catalyst at the same time of stirring, dynamically pressurizing and adding the stirred slurry into a die for heating and curing; and crosslinking and polymerizing an organic polymer monomer in the heating and curing process into three-dimensional grid-shaped polymer gel, and bonding and curing the quartz powder to form the blank. The manufacture method provided by the invention has a short production period, high efficiency and a low cost and meets the need of mass industrial production, and the quartz crucible for casting the polycrystalline silicon ingot, which is manufactured according to the invention, has small size distortion, low apparent porosity and high compressive strength and rupture strength.

Description

technical field [0001] The invention relates to a production process of a quartz crucible, in particular to a production process of a quartz crucible used for polycrystalline silicon ingots. Background technique [0002] Quartz ceramic crucibles made by traditional techniques are generally formed by grouting, followed by centrifugal casting, pouring, wax injection, semi-dry molding, etc. Quartz ceramic crucibles and other products prepared by these molding processes generally have the problems of uneven microstructure and poor material reliability. They are not suitable for making ultra-large crucibles and products with complex shapes, and have defects such as long production cycle, low efficiency, and high cost. It is difficult to adapt to the needs of mass industrial production, and the quartz ceramic crucible produced by the above process has large dimensional deformation, high apparent porosity, low compressive strength and flexural strength, and is difficult to meet the...

AI Technical Summary

Problems solved by technology

[0002] Quartz ceramic crucibles made by traditional techniques are generally formed by grouting, followed by centrifugal casting, pouring, wax injection, semi-dry molding, etc. Quartz ceramic crucibles and other products prepared by these molding processes generally have the problems of uneven microstructure and poor material reliability. They are not suitable for making ultra-large crucibles and products with complex shapes, and have defects such as long production cycle, low efficiency, and high cost. It is difficult to adapt to the needs of large-scale industrial production, and the quartz ceramic crucible produced by the above process has large dimensional deformation, high apparent porosity, low compressive strength and flexural strength, and it is difficult to meet the needs of polycrystalline silicon ingots in the photovoltaic industry