Aluminum titanate-mullite cellular ceramic and its production

A technology of honeycomb ceramics and mullite, which is applied in the field of silicate materials and industrial ceramics, can solve problems such as increased thermal expansion coefficient, reduced service life, and impact on service life, and achieves stable water absorption, high service life, and high resistance thermal shock effect

Inactive Publication Date: 2010-06-02
安徽宁国市先浩高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that due to the poor cleanliness of fuel in my country, most of the waste gas from metallurgical kilns contains various impurities. As a result, when used at high temperatures, cordierite honeycomb ceramics will react with some substances in the waste gas, thereby reducing its service life
In order to improve its high temperature stability, mullite, Al 2 o 3 、Si 3 N 4 , ZrO 2 Such honeycomb ceramics greatly improve the mechanical strength of the carrier material, the use temperature and the chemical stability at high temperature, but because the thermal expansion coefficient of these materials increases with the increase in strength, the temperature required for regenerative combustion changes sharply (at Their service life is still greatly affected under the harsh environmental conditions of rapid cooling temperature difference in the air above 800°C

Method used

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  • Aluminum titanate-mullite cellular ceramic and its production
  • Aluminum titanate-mullite cellular ceramic and its production
  • Aluminum titanate-mullite cellular ceramic and its production

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Embodiment Construction

[0036] Embodiments of the present invention are shown in Table 1,

[0037] The preparation method of the present invention is,

[0038] Ingredients: Clay, alumina, titanium oxide, cristobalite, magnesium aluminum spinel and other raw materials are composed according to the following mass ratio:

[0039] Clay (alumina ≥ 30%) 45-65%

[0040] Aluminum oxide 25-39%

[0041] Titanium dioxide (titanium oxide ≥ 98%) 8 ~ 18%

[0042] Magnesium aluminum spinel 1~5%

[0043] Cristobalite 1~3%

[0044] The above-mentioned raw materials are molded according to the following steps:

[0045] Batching→ball milling and mixing→filtering mud→vacuum kneading and filtering mud→drying→mixing→aging→extruding→drying→firing

[0046] The aging is placed for 24-48 hours;

[0047] (The firing temperature is 1450~1600℃)

[0048] The aluminum titanate-mullite honeycomb ceramics obtained through the above steps.

[0049] Table 1

[0050]

[0051]

[0052] The physical properties of aluminum...

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Abstract

An aluminum titanate-mullite cellular ceramic and its production are disclosed. The process is carried out by putting into clay alumina, titanium oxide, ashlar and magnesite-alumina spinel, mixing, wet grinding in ball grinder into powder below 500 meshes, filter pressing, vacuum mud refining to make mud blocks, adding into plastic adhesive with methyl-cellulose and polyvinyl alcohol, extruding, forming, drying and firing at 1450-1600 degree to obtain final product. It's stable, has high melt point, low heat expansion coefficient, excellent chemical-corrosive and thermal shock resistances. Itcan be used in high-temperature heat-storage burning system in industrial furnace, petroleum catalytic cracking and tailed-gas catalytic purifying of automobile industries.

Description

technical field [0001] The technical field of the invention belongs to the fields of silicate materials and industrial ceramics. Background technique [0002] In the early 1990s, Japan Steel Tube Co., Ltd. (NKK) and Nippon Industrial Furnace Co., Ltd. (NFK) jointly developed a new type of heat accumulator called the high-efficiency ceramic heat storage system HRS (High-cycle Regenerative Combustion System). NKK conducted several tests and analyzed the measured data. It was found that the temperature of the air entering the burner after preheating was close to the exhaust gas discharge temperature. The data shows that the air preheating temperature reaches 1300 ℃, the O in the furnace 2 When the content is 11%, the NOx emission is 40kg / m 3 . The development of HRS not only realizes the ultimate recovery of flue gas waste heat and a substantial reduction in NOx emissions, but also leads to a new combustion technology - high temperature air combustion technology HTAC (High ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/622
Inventor 俞浩徐欣周志刚
Owner 安徽宁国市先浩高温材料有限公司
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