Infrared radiation porous ceramics on furnace lining firebrick and preparation method thereof

A technology of porous ceramics and infrared radiation, applied in ceramic products, applications, household appliances, etc., can solve problems such as unsuitable for large-scale heating, low thermal conductivity, complex manufacturing process, etc., and achieve good resistance to rapid cooling and rapid heating, and chemical stability Good, the effect of reducing heat loss

Inactive Publication Date: 2008-01-30
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the use temperature is low, and it needs to be casted on a special porous mold, the process is complicated and the cost is high
[0005] As a thermal insulation material, porous ceramics are required to have low thermal conductivity, good thermal insulation, thermal and chemical stability, high temperature resistance, and certain strength; for this reason, chromium oxide, oxidized Zirconium, etc., but these materials have the disadvantages of high raw material prices, complicated manufacturing processes, and high firing temperatures.
The sintering temperature is generally ≥1200°C. For most medium-high temperature furnaces with a furnace temperature of 950-1200°C, the furnace temperature cannot be used for sintering, so it is not suitable for large-scale heating and drying furnace lining applications.

Method used

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  • Infrared radiation porous ceramics on furnace lining firebrick and preparation method thereof
  • Infrared radiation porous ceramics on furnace lining firebrick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] An infrared radiation porous ceramic on a furnace lining refractory brick, prepared from aggregate and a binder to form a slurry, the aggregate essentially contains the following ingredients in weight percentage: 20-45% of light floating beads, 20-40% of Suzhou soil , 5-15% of aluminum oxide microbeads, 5-12% of magnesium oxide, 5-15% of high emissivity materials, and 1-5% of coal powder.

[0055] Among them, the high emissivity material is composed of the following materials in weight percentage: ferric oxide 42-48%, manganese dioxide 20-30%, dicobalt oxide 8-14%, copper oxide 8-13%, cerium oxide After 7-12% mixing, it is made by sintering at 1260-1300°C for 0.8-2h.

[0056] The particles of the aluminum oxide microbeads are 100-180 mesh.

[0057] The binder contains the following ingredients in weight percent: 80-90% of silicon-chromium-aluminum composite sol, 10-20% of silicone resin;

[0058] The weight percentage between the binder and the aggregate is 33-42%:58-...

Embodiment 2

[0082] The weight percentages of the components of the aggregate in this embodiment are: 27-43% of lightweight floating beads, 25-38% of Suzhou soil, 7-13% of aluminum oxide microbeads, 7-10% of magnesium oxide, high emissivity Ratio material 7-13%, coal powder 2-4%;

[0083] Wherein, the high-emissivity material is composed of the following materials in weight percentage: 42% of ferric oxide, 20% of manganese dioxide, 14% of dicobalt oxide, 13% of copper oxide, and 11% of cerium oxide. Made by sintering at -1275°C for 0.8h.

[0084] The weight ratio of each component of the binder is: 80-85% of silicon-chromium-aluminum composite sol, 15-20% of silicone resin;

[0085] The weight ratio of binder to aggregate is 33-36%: 64-67%.

[0086] Experiments have shown that the bulk density of the porous ceramics described in this example is 0.90-0.99g / cm 3 , can be sintered at a temperature of 950-1150°C, the thermal conductivity at 100°C and 900°C are 0.042-0.046, 0.316-0.321w / m·k,...

Embodiment 3

[0088] The difference from the second embodiment is that the aggregate in this embodiment also contains a sintering aid less than or equal to 1% of the total weight of the aggregate, and the sintering aid is glass frit. Others are the same as the second embodiment. The sintering aid can improve the fluidity and sintering performance of the slurry, reduce the sintering temperature, and give the green body a certain strength at low temperature.

[0089] Experiments have proved that the porous ceramics described in this example can be sintered at a temperature of 950-1100°C.

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Abstract

The invention relates to an infrared radiation porous ceramic used on the surface of lining firebrick and preparation method thereof. Slurry of the porous ceramic is made of aggregate and binder. The aggregate is made of the following compositions: light floating bead with 20-45 percent, Suzhou earth with 20-40 percent, aluminum oxide micro bead 5-15 with percent, magnesium oxide with 5-12 percent, high emissivity material with 5-15 percent, and coal powder with 1-5 percent. The preparation steps are as follows: 1. separate ball milling of Suzhou earth, magnesium oxide, high emissivity material to prepare for making the light floating bead and prepare for the aggregate processing; 2. the made slurry is sprayed to base, then the base is heated, sintered and cured in furnace. The invention can be sintered under a low temperature of 950-1200 DEG C and has high intensity, small density, low heat conductivity, high normal total emissivity of total infrared band 2.5-20 Mum. The invention can be made under no special equipment, is simple and practical, and can be broadly popularized.

Description

technical field [0001] The present invention relates to an infrared radiation porous ceramic material and its preparation method, especially a kind of low density and low thermal conductivity that can be sintered at a relatively low temperature and used for various medium and high temperature heating and drying furnace lining refractory bricks. The full infrared band has high Emissivity infrared radiation porous ceramics and preparation method. Background technique [0002] Infrared radiation materials have the characteristics of high emissivity, fast heat transfer speed, and high heating quality. They have been developed rapidly in recent years. They have been used in various medium and high temperature furnace linings and infrared radiation materials on heating elements, and have achieved remarkable results in energy saving and furnace lining protection Effect; patents such as Chinese Patent Publication Nos. CN1114329A, CN1131691A and Authorization No. CN2195745Y. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/26C04B38/00
Inventor 朱小平蒋扬虎陈健康吴杰刘萍马卫东赖为民欧阳德刚李明晖田大鹏
Owner 武钢集团有限公司
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