β-sic/si2n2o composite sic kiln furniture and its preparation method

A technology of composite phase combination and kiln furniture, which is applied in the field of refractory materials, can solve the problems of complex process conditions, performance needs to be improved, and high production costs, and achieve simplified processes, excellent oxidation resistance and thermal shock resistance, and reduced production costs Effect

Inactive Publication Date: 2016-02-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the existing Si 2 N 2 O Combined with the defects of high production cost, high energy consumption, complex process conditions, and performance improvement of silicon carbide kiln furniture, make full use of β-SiC and Si 2 N 2 performance characteristics of O, a β-SiC / Si from polysilicon waste as raw material was proposed 2 N 2 O complex phase combined with SiC kiln furniture and preparation method not only improves the performance of kiln furniture, reduces the production cost of kiln furniture, but also realizes the comprehensive reuse of polysilicon waste, reducing resource waste and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A β-SiC / Si 2 N 2 O complex-phase combined SiC kiln furniture and its preparation method, in terms of weight percentage, the raw material composition is: 45% of SiC particles with a particle size of 3-1mm, 15% of SiC particles with a particle size of 1-0.2mm, and SiC fine powder with a particle size of ≤0.088mm13 %, industrial metal silicon powder 17%, polysilicon waste 10%, plus 3% pulp waste liquid.

[0022] (1). Ingredients: Weigh various raw materials according to the ratio, mix the pre-weighed SiC coarse and medium granular aggregates and pour them into the wheel mill for further mixing. Stop stirring after 3 to 5 minutes, and put the Weigh half of the prepared binder and pour it into the wheel mill, then turn on the switch and stir for 5 minutes, so that the binder is evenly distributed on the surface of the particles; then pour the weighed SiC fine powder and polysilicon waste into the wheel mill and stir for 5 minutes, then Pour all the remaining binder into it...

Embodiment 2

[0028]The raw material composition is the same as that of Example 1, and the production process is basically the same as that of Example 1, except that the sintering temperature is 1500°C.

[0029] The performance index of the obtained product is: apparent porosity 16%, bulk density 2.61g / cm 3 , The normal temperature compressive strength is 157MPa, the high temperature flexural strength is 56MPa, and its thermal shock resistance and oxidation resistance are good.

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PUM

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Abstract

The invention discloses a beta-SiC / Si2N2O complex phase combined SiC kiln furniture and a preparation method, belonging to the field of fireproof materials. Raw materials comprise silicon carbonate, metallic Si, a polycrystalline silicon waste material as well as waste pulping liquor which is 2%-6% of the raw materials in total content and is used as a binding agent. During production, various raw materials are weighed in proportion and mixed to obtain a pug material, and the pug material is compression-molded, dried for 24-28 hours at the temperature of 110+ / -10 DEG C and then sintered at the temperature of 1200-1500 DEG C under a carbon-buried condition. The product has the following excellent physical performance indexes: apparent porosity being 9% to 22%, volume density being 2.3g / cm<3> to 2.9g / cm<3>, compression strength at normal temperature being 60MPa to 200MPa, rupture strength at normal temperature being 20MPa to 75MPa, good oxidation resistance and good thermal shock resistance. In the method disclosed by the invention, the polycrystalline silicon waste material is taken as the raw material, and a carbon-buried sintering mode is adopted to simplify the production process, so the production cost of the SiC kiln furniture is lowered, the recycle of the polycrystalline silicon waste material is realized as well, and the waste of resources and environmental pollution are reduced.

Description

technical field [0001] The invention relates to a β-SiC / Si in the field of refractory materials 2 N 2 O complex phase combined SiC kiln furniture and preparation method. Background technique [0002] Kiln furniture is a kind of high-grade refractory material, and its quality has an extremely important impact on the quality and energy consumption of fired products. With the popularization and application of rapid firing technology in the ceramic industry, the cycle period of kiln furniture is getting shorter and shorter, and the use conditions are more stringent. The need for the development of industrial rapid sintering technology. Silicon carbide refractories have been widely developed and applied as kiln furniture for ceramic firing kilns due to their high thermal conductivity, low thermal expansion coefficient, good high temperature performance and thermal shock resistance. [0003] SiC has strong covalent bond characteristics, and it is difficult to sinter under gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/565C04B35/622
Inventor 王婷李勇孙加林
Owner UNIV OF SCI & TECH BEIJING
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