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Process for manufacturing quartz ceramic crucible

A technology of quartz ceramics and crucibles, which is applied in the manufacture of tools, glass manufacturing equipment, glass molding, etc., can solve the problems of high manufacturing cost, easy cracking of crucibles, and low yield of crucibles, so as to achieve high yields and reduce manufacturing costs. Effect

Active Publication Date: 2015-06-10
弘元新材料无锡有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing crucible manufacturing process is to melt the quartz, place it directly in the plaster mold, and then fire it into shape, but because the melting process of the quartz needs 1750°C~1800°C, the quartz will change from a crystalline state to a liquid state, and the volume will expand. , and then injected into the plaster mold, the same volume of liquid quartz fills the cavity of the plaster mold. During the crystallization process, the volume of liquid quartz shrinks, which makes the crucible easy to crack, resulting in low yield of crucible and high manufacturing cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0015] (a) Preparation of pouring slurry: add water to the quartz glass and grind it to make a slurry, in which the mass fraction of water is 18%, and grind it in a ball mill at 70°C for 12 hours to make the quartz glass form small particles, and then add medium and large Granular quartz dry powder, small particle size ≤ 0.5mm, medium and large particle size 0.5 mm ~ 1mm, of which the mass fraction ratio of quartz glass: quartz dry powder is 55%: 45%, and then add 0.1% of the total mass Silica sol, mixed and stirred to form pouring slurry, the water content of the pouring slurry after mixing is 10.7%;

[0016] (b) Pouring the demoulding body: pour the prepared pouring slurry into the cavity of the gypsum mold, wait until the pouring slurry fills the cavity of the mold, let it stand, and demould after 4 hours to form a demoulding base body;

[0017] (c) Drying: Put the stripped body into a drying oven, and dry it at 100°C for 10 hours;

[0018] (d) Firing: put the dried strip...

specific Embodiment 2

[0020] (a) Preparation of pouring slurry: Add water to the quartz glass and grind it to make a slurry, in which the mass fraction of water is 15%, and grind it in a ball mill at 75°C for 10 hours to make the quartz glass form small particles, and then add medium and large Granular quartz dry powder, small particle size ≤ 0.5mm, medium and large particle size 0.5 mm ~ 1mm, wherein the mass fraction ratio of quartz glass: quartz dry powder is 50%: 50%, and then add 0.2% of the total mass Silica sol, mixed and stirred to form pouring slurry, the water content of the pouring slurry after mixing is 8%;

[0021] (b) Pouring the demoulding body: pour the prepared pouring slurry into the cavity of the gypsum mold, wait until the pouring slurry fills the cavity of the mold, let it stand, and demould after 6 hours to form a demoulding base body;

[0022] (c) Drying: Put the stripped body into a drying oven, and dry it at 125°C for 8 hours;

[0023] (d) Firing: put the dried stripped b...

specific Embodiment 3

[0025] (a) Preparation of pouring slurry: add water to the quartz glass and grind it to make a slurry, in which the mass fraction of water is 22%, and grind it in a ball mill at 80°C for 8 hours to make the quartz glass form small particles, and then add medium and large Granular quartz dry powder, small particle size ≤ 0.5mm, medium and large particle size 0.5 mm ~ 1mm, of which the mass fraction ratio of quartz glass: quartz dry powder is 50%: 50%, and then add 0.3% of the total mass Silica sol, mixed and stirred to form pouring slurry, the water content of the pouring slurry after mixing is 12%;

[0026] (b) Pouring the demoulding body: pour the prepared pouring slurry into the cavity of the gypsum mold, wait until the pouring slurry fills the cavity of the mold, let it stand, and demould after 8 hours to form a demoulding base body;

[0027] (c) Drying: put the demoulding body into a drying oven, and dry it at 150°C for 6 hours;

[0028] (d) Firing: put the dried strippe...

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Abstract

The invention provides a process for manufacturing a quartz ceramic crucible, which ensures that the rate of finished products of the manufactured crucibles is high and the manufacturing cost is lowered. The process is characterized by comprising the following steps of: (a) preparing casting pulp: adding quartz glass into water for milling and pulping, then adding dry quartz powder and silica sol, and mixing and stirring to form the casting pulp, wherein the mass percent of the quartz glass to the dry quartz powder is (55%-50%):(45%-50%), and the water content of the casting pulp is 8%-12%; (b) casting a demolded billet: casting the prepared casting pulp in the cavity of a gypsum mold, standing for 4-8h after the casting pulp is filled in the cavity of the mold, and then, demolding to form the demolded billet; (c) baking: putting the demolded billet into a baking furnace for baking for 6-10h at 100-150 DEG C; (d) firing: putting the baked demolded billet into a kiln for firing for 16-24h at 1100-1200 DEG C; and (e) polishing and detecting: polishing uneven burrs, and detecting whether cracks exist at the inner part or not.

Description

technical field [0001] The invention relates to the technical field of manufacturing polysilicon crucibles, in particular to a process for manufacturing quartz ceramic crucibles. Background technique [0002] In existing polysilicon, various substances are mixed into a crucible, and then the crucible and various substances inside are put into a furnace for sintering to obtain polysilicon, and the crucible is discarded. [0003] The existing crucible manufacturing process is to melt the quartz, place it directly in the plaster mold, and then fire it into shape, but because the melting process of the quartz needs 1750°C~1800°C, the quartz will change from a crystalline state to a liquid state, and the volume will expand. , and then injected into the plaster mold, the same volume of liquid quartz fills the cavity of the plaster mold. During the crystallization process, the liquid quartz shrinks in volume, which makes the crucible easy to crack, resulting in a low yield of the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B20/00
Inventor 杨建良
Owner 弘元新材料无锡有限公司