Anti-softening silicon nitride gradient-doped quartz crucible preparation method

Abstract

In an anti-softening silicon nitride gradient-doped quartz crucible preparation method, high-purity powdery quartz is uniformly spread on a rotating graphite matrix manually or by a mechanical distributor to serve as a quartz crucible base material. After distribution is finished, the furnace is sent into a three-phase arc furnace, the material is heated to be melted by the high-temperature arc produced by three phases of electrified graphite electrodes, the melting temperature is kept at more than 2000 DEG C, and when the melted material reaches certain thickness and does not have apparent boundary layers, heating is stopped and the material is naturally cooled to the room temperature. Gradient quartz / silicon nitride composite quartz crucibles with different mechanical properties and softening points, which are prepared by adjusting the contents and distribution of quartz powder and silicon nitride powder, have high strength, meanwhile, the softening points of the quartz crucibles are increased, and the quartz crucibles can be prevented from being deformed when in use, and can be repetitively used in the process of monocrystalline silicon preparation.

Description

technical field [0001] The invention relates to the field of production of inorganic non-metallic materials, in particular to a high-performance structural ceramic [0002] and preparation of functionally graded materials. Background technique [0003] In recent years, due to the rapid development of the semiconductor and solar photovoltaic industries, the demand for arc crucibles has also surged. Although the production level of quartz crucibles has made progress in recent years, the entire industry still has not got rid of the mode of manual operation based on experience, the level of automation in the production process is low, and the product quality is unstable. The container for drawing monocrystalline silicon mainly relies on quartz crucibles. During the drawing process, quartz crucibles have to withstand high temperatures above 1420°C and a time test of up to 20-40 hours, and can only be used once, which is a price. Expensive products with high material consumption...

AI Technical Summary

Problems solved by technology

The container for drawing monocrystalline silicon mainly relies on quartz crucibles. During the drawing process, quartz crucibles have to withstand high temperatures above 1420°C and a time test of up to 20-40 hours, and can only be used once, which is a price. Expensive products with high material consumption

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