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Ingot mold coating for industrial silicon production and preparation method of ingot mold coating

A technology for industrial silicon and ingot moulds, applied in coatings, chemical instruments and methods, crystal growth, etc., can solve problems such as lack of coatings, and achieve the effects of maintaining moisture content, fast heat transfer, and excellent flocculation energy

Active Publication Date: 2019-08-30
新疆泰宇达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide the ingot mold coating and preparation method thereof for industrial silicon production, to solve the problem in the prior art that there is no coating that can match the polysilicon mold, realize that it can be matched with the polysilicon mold, and ensure that the polysilicon mold The purpose of being able to give full play to its own advantages in the process of industrial silicon molding

Method used

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  • Ingot mold coating for industrial silicon production and preparation method of ingot mold coating

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Embodiment 1

[0029] A method for preparing an ingot mold coating for industrial silicon production, comprising the following steps:

[0030] (a) 50 parts of silicon carbide, 25 parts of silicon nitride, 10 parts of calcium silicate, 15 parts of bentonite, 6 parts of adhesive, and 1 part of graphite powder are fully ground and mixed;

[0031] (b) Put the mixed raw materials into a reaction kettle, add a solvent, and stir for 30 minutes at 85-90°C under normal pressure;

[0032] (c) Add 8 parts of sodium tripolyphosphate and 3 parts of acrylamide and / or polyacrylamine into the reaction kettle, raise the temperature in the kettle to 150°C, raise the pressure in the kettle to 1.5 times the atmospheric pressure, and stir for 60 minutes;

[0033] (d) discharge to normal pressure in the reaction kettle, make the inside of the reaction kettle be cooled to room temperature;

[0034] (e) The finished product in the reactor should be sealed and stored.

[0035] The stirring method in this embodimen...

Embodiment 2

[0039] The weight ratio of each component in the coating of this embodiment is: 50 parts of silicon carbide, 28 parts of silicon nitride, 11 parts of calcium silicate, 17 parts of bentonite, 9 parts of sodium tripolyphosphate, acrylamide and / or polypropylene 4 parts dilute amine, 7 parts adhesive, 1.5 parts graphite powder, 25 parts solvent. Wherein, among the components of the adhesive, silica sol:sodium silicate=7:3; among the components of silicon carbide, α-phase silicon carbide:β-phase silicon carbide=1:1; 80% of silicon nitride is γ phase silicon nitride, and the remaining 20% ​​is alpha phase silicon nitride and / or beta phase silicon nitride.

Embodiment 3

[0041] The weight ratio of each component in the coating of this embodiment is: 50 parts of silicon carbide, 30 parts of silicon nitride, 12 parts of calcium silicate, 20 parts of bentonite, 10 parts of sodium tripolyphosphate, acrylamide and / or polypropylene 5 parts dilute amine, 8 parts adhesive, 2 parts graphite powder, 30 parts solvent. Wherein, among the components of the adhesive, silica sol:sodium silicate=7:3; among the components of silicon carbide, α-phase silicon carbide:β-phase silicon carbide=1:1; 80% of silicon nitride is γ phase silicon nitride, and the remaining 20% ​​is alpha phase silicon nitride and / or beta phase silicon nitride.

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Abstract

The invention discloses an ingot mold coating for industrial silicon production and a preparation method of the ingot mold coating. The ingot mold coating consists of the following raw materials in parts by weight: 50 parts of silicon carbide, 25-30 parts of silicon nitride, 10-12 parts of calcium silicate, 15-20 parts of bentonite, 8-10 parts of sodium tripolyphosphate, 3-5 parts of acrylamide and / or polyacrylamide, 6-8 parts of an adhesive, 1-2 parts of graphite powder and 20-30 parts of a solvent. The ingot mold coating is specifically applied to an industrial silicon molding mold which ismade of polycrystalline silicon as a raw material, is capable of solving the problem that in the prior art a coating matched with a polycrystalline silicon mold is not available, and ensures that thepolycrystalline silicon mold maintains advantages of rapid heat conduction and no contamination of self; and a mode that a conventional mold coating takes carbon or a carbon-containing organic matteras a main coating agent is abandoned, a silicon-based main agent is adopted to match with the polycrystalline silicon mold for industrial silicon production, and silicon carbide and silicon nitride are capable of ensuring that no impurity contamination is caused for silicon molding, meanwhile have very good adaptability with the polycrystalline silicon, and ensure that industrial silicon is not contaminated by the coating while the industrial silicon is not contaminated by the polycrystalline silicon.

Description

technical field [0001] The invention relates to the field of industrial silicon, in particular to an ingot mold coating for industrial silicon production and a preparation method thereof. Background technique [0002] Industrial silicon, also known as metal silicon, is mainly used as an additive for non-ferrous alloys. Metal silicon is a product smelted from quartz and coke in an electric furnace. The main component silicon content is about 98% (in recent years, 99.99% of Si content is also included in metal silicon), and the remaining impurities are iron and aluminum. , calcium, etc. Silicon is widely used in smelting into ferrosilicon alloy as an alloying element in the iron and steel industry, and as a reducing agent in the smelting of many kinds of metals. Silicon is also a good component in aluminum alloys, and most cast aluminum alloys contain silicon. Silicon is the raw material of ultra-pure silicon in the electronics industry. Electronic devices made of ultra-pur...

Claims

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Application Information

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IPC IPC(8): C30B28/06C30B29/06C09D1/00C09D7/61C09D7/65C09D7/63
CPCC09D1/00C09D7/61C09D7/63C09D7/65C30B28/06C30B29/06
Inventor 羊实周旭
Owner 新疆泰宇达环保科技有限公司
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