High-strength pore-closed mullite material and preparation method thereof

A mullite and closed-cell technology, which is applied in the preparation of new porous ceramics or porous refractory materials, high-strength closed-pore mullite materials and their preparation, can solve problems such as environmental pollution and adverse effects on material erosion resistance, and achieve Good corrosion resistance, high load softening temperature point, and controllable pore size

Inactive Publication Date: 2017-02-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all add organic burnt matter in the process of preparing porous mullite, and increase CO during the calcination process. 2 The discharge will pollute the environment. At the same time, the gas is discharged from the inside of the material, and most of the formed pores are open pores, which have an adverse effect on the corrosion resistance of the material.

Method used

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  • High-strength pore-closed mullite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Mix 50wt% alumina raw material, 15wt% aluminosilicate raw material and 35wt% siliceous raw material by weight percentage to prepare mixed raw material, add the sum of the mass percentage of the above raw materials and 4wt% pulp waste liquid as an additive , Stir evenly to get the mixed mud, pour the mixed mud into the mold and press it at 120MPa to get the green body, bake the green body at 120°C for 6 hours, put it in a high-temperature furnace at 1700-1750°C Calcined at low temperature for 6 hours, the high-strength closed-pore mullite material can be obtained.

[0020] The alumina raw material described in this embodiment is tabular corundum, and Al in the raw material 2 o 3 Mass percentage content ≥ 96.0wt%, particle size ≤ 0.074mm; aluminosilicate raw material is sintered mullite, particle size ≤ 0.074mm; the silicon dioxide raw material is fused quartz, and SiO 2 Mass percentage content ≥ 99.0wt%, particle size: 0.01 ~ 0.088mm.

[0021] The technical indicators...

Embodiment 2

[0023] By weight percentage, 50wt% alumina material, 10wt% aluminosilicate material and 40wt% siliceous material are uniformly mixed to obtain a mixed material, and the sum of the mass percentage of the above materials and 4wt% dextrin are added as additives. Stir evenly to get the mixed mud, pour the mixed mud into the mold and press at 100MPa to get the green body, bake the green body at 100°C for 8 hours, put it in a high-temperature furnace at 1650-1700°C Calcined for 8 hours, the high-strength closed-pore mullite material is obtained.

[0024] The alumina raw material described in this embodiment is industrial alumina, and Al in the raw material 2 o 3 The mass percentage content is ≥98.0wt%, and the particle size is ≤0.074mm; the aluminosilicate raw material is burnt gemstone, and the particle size is ≤0.074mm; the silicon dioxide raw material is waste silica brick, and SiO 2 Mass percentage content ≥ 95.0%, particle size: 0.04 ~ 0.15mm.

[0025] The technical indicato...

Embodiment 3

[0027] By weight percentage, 45wt% of the alumina material, 15wt% of the aluminum siliceous material and 40wt% of the siliceous material are mixed uniformly to prepare the mixed material, and the sum of the mass percentage of the above materials is added to 5wt% dextrin as an additive. Stir evenly to get the mixed mud, pour the mixed mud into the mold and press it at 120MPa to get the green body, bake the green body at 120°C for 6 hours, put it in a high-temperature furnace at 1650-1680°C After calcining for 4-6 hours, the high-strength closed-pore mullite material can be obtained.

[0028] The alumina raw material described in this embodiment is sintered corundum, and Al in the raw material 2 o 3 The mass percentage content is ≥97.0wt%, and the particle size is ≤0.074mm; the aluminosilicate raw material is andalusite, and the particle size is ≤0.074mm; the silicon dioxide raw material is fused quartz, and SiO 2 Mass percentage content ≥ 99.0wt%, particle size: 0.01 ~ 0.044m...

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Abstract

The invention relates to a high-strength pore-closed mullite material and a preparation method thereof. The material comprises, by weight, 30-84wt% of alumina raw material, 1-55wt% of alumina-silica raw material, 15-60% of silica raw material and 2-10wt% of additive. The preparation method includes: mixing the raw materials according to the above proportion, adding the additive, stirring well, and pouring into a die; performing mechanical pressing under 80-150MPa to obtain a blank, and drying the blank at 60-140 DEG C for 3-16h; putting the blank in a high-temperature kiln for calcining to obtain the high-strength pore-closed mullite material. Sintering in-situ pore forming technology is adopted, so that the high-strength pore-closed mullite material prepared by the method has the advantages of high closed porosity, high pressure-resistant strength and high refractoriness under load and can be used for a long time at high temperature of 1550-1700 DEG C.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a preparation method of novel porous ceramics or porous refractory materials, in particular to a high-strength closed-pore mullite material and a preparation method thereof. [0002] technical background [0003] With the continuous deterioration of the environment, energy-saving materials have become one of the important directions of new materials. In order to further reduce emissions in high-temperature industries, lightweight porous refractory materials have been widely used. Due to the high open porosity, poor strength and wear resistance, low softening temperature under load, and poor corrosion resistance in traditional porous materials, they can only be used in low-temperature heat insulation layers and are not directly in contact with high-temperature melts. used in the working layer. [0004] In order to overcome the shortcomings of traditional po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/622C04B38/06
CPCC04B35/185C04B35/622C04B38/0645C04B38/0675C04B2235/77C04B2235/96C04B38/0061C04B38/0074C04B38/0067
Inventor 赵飞葛铁柱叶国田贾全利任桢陈留刚
Owner ZHENGZHOU UNIV
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