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Method for preparing high performance silicon oxide combining silicon carbide refractory by low-temperature sintering

A technology of low-temperature firing and refractory materials, applied in the field of refractory materials, can solve problems such as reducing the high-temperature performance of materials, and achieve the effects of avoiding pollution, avoiding adverse effects, and reducing firing energy consumption

Active Publication Date: 2009-05-06
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to improve the forming performance of the billet and reduce the sintering temperature, a small amount of clay is often added to the material composition, and the addition of clay will reduce the high temperature performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 50% of SiC particles with a particle size of 1-2mm, 30% of SiC particles with a particle size of 0.1-1mm, 15% of SiC fine powder with a particle size of ≤0.088mm, and SiO with a particle size of ≤20μm 2 5% fine powder, plus 6% phenolic resin solution as a binder, mixed evenly in a sand mixer, and the mud was machine-pressed on a hydraulic press to obtain a 500×450×12mm green body, which was subjected to 150°C, 5 hours to dry. Put the green body in a stainless steel container, put it in a vacuum chamber, evacuate to a vacuum of 25kPa, keep it for 5 minutes, and slowly inject an alkaline silica sol solution (SiO 2 Concentration 25%, PH value = 8.5 ~ 10) completely submerge the green body, the liquid level is 11mm higher than the green body, keep it under the same vacuum condition for 15 minutes, and then keep it in the air state for 10 minutes, take out the green body at 110 ℃ After drying for 3 hours, the green body is put into a shuttle kiln and fired in an air atmosph...

Embodiment 2

[0026] 45% of SiC particles with a particle size of 1-3mm, 30% of SiC particles with a particle size of 0.1-1mm, 20% of SiC fine powder with a particle size of ≤0.092mm, and SiO with a particle size of ≤15μm 2 4.5% fine powder, 0.5% Si powder ≤ 60μm, plus 5% furan resin solution as a binder, mix evenly in a sand mixer, and press the mud on a hydraulic press to make a green body of 500×550×15mm , The body was dried at 180°C for 10 hours. Put the cooled body into an aluminum container, place it in a vacuum chamber, evacuate to a vacuum of 30kPa, keep it for 10 minutes, and slowly inject the silica sol solution (SiO 2 Concentration 20%, PH value=9.7) Submerge the green body and the liquid level is 15mm higher than the green body, keep it under the condition of vacuum degree of 30kPa for 20 minutes, then keep it in the air state for 12 minutes, take out the green body and carry out at 150°C for 8 hours dry. Repeat the above-mentioned process, and then carry out a silica sol impr...

Embodiment 3

[0028] 15% of SiC particles with a particle size of 3-5mm, 35% of SiC particles of 1-3mm, 15% of SiC particles of 0.1-1mm, 26% of SiC fine powder of ≤0.076mm, and SiO of ≤25μm 2 9% fine powder, plus 2.0% phenolic resin solution and 2.0% furan resin solution, mixed evenly in the sand mixer, and the mud material was machine-pressed on a hydraulic press to obtain a 200×80×60mm green body, which was passed through Dry at 190°C for 25 hours. Put the cooled body into a stainless steel container, place it in a vacuum chamber, evacuate to a vacuum of 27kPa, keep it for 10 minutes, and slowly inject the silica sol solution (SiO 2 Concentration 20%, PH value=10.2) completely submerge the green body, the liquid level is higher than the green body 25mm, keep 15 minutes under the condition of vacuum degree 27kPa, then keep 15 minutes under the air state, take out the green body and carry out 9 minutes at 130 ℃ hours to dry. The green body is placed in a shuttle kiln and fired in an air a...

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Abstract

The invention belongs to a refractory material technology, and provides a method for preparing a high-performance silica bonded silicon carbide refractory material through low temperature calcination. The method comprises the following steps: SiC particles, fine powder, fine SiO2 powder, and Si powder are taken as raw materials, the raw materials and a bonding agent are calendered, molded and dried, and then a silica sol solution is adopted to perform at least one time of vacuum infiltration treatment on a green body; the final calcination temperature range of the green body is between 1,100 and 1,250 DEG C, and the high-performance silica bonded silicon carbide refractory material can be prepared. The highest calcination temperature of the refractory material is between 100 and 500 DEG C lower than that of the prior SiO2 bonded silicon carbide material, which can apparently reduce the calcination energy consumption of the material. The material has good physical and chemical performance: the content of SiC is between 85 and 95 percent, the volume density is between 2.65 and 2.82g / cm<3>, the high temperature rupture strength at a temperature of 1,400 DEG C reaches between 40 and 52 MPa, and the highest service temperature of the material can reach 1,550 DEG C; and the refractory material can be used as ceramic kiln furniture and kiln linings of various industrial kilns such as zinc smelters, garbage incinerators, and has good application effect.

Description

technical field [0001] The invention belongs to the technology of refractory materials, and mainly relates to a method for preparing high-performance silicon oxide bonded silicon carbide refractory materials by firing at low temperature Background technique [0002] SiO 2 Combining SiC refractories is a kind of SiO 2 The oxide-bonded SiC material with SiC as the main binding phase has excellent heat resistance, good mechanical properties and chemical stability, and is widely used in steel, nonferrous metallurgy, ceramics, power generation, chemical and other industrial fields. Applications. For example, SiO 2 Combined with SiC material, it is one of the most widely used ceramic kiln furniture materials at present, and can be used as shed board, column, push board, pad burning board, etc.; SiO 2 Combined with SiC, it is widely used as a furnace lining material in industrial furnaces such as waste incineration furnaces, aluminum smelting furnaces, and zinc smelting furnace...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 吴吉光程竹张新华李延军吕祥青王建波李杰黄志明
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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