A preparation method of thermal shock resistant cordierite refractory kiln furniture

A technology of cordierite and thermal shock resistance, which is applied in the field of refractory materials, can solve the problems affecting the service life and quality of kiln furniture, large shrinkage rate of kiln furniture materials, poor thermal shock resistance and other problems, and achieves small conversion linear expansion and heat resistance The effect of transmitting and increasing the tensile strength

Inactive Publication Date: 2018-09-04
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the 1980s, ceramic rapid sintering technology has been promoted at home and abroad, and silicon carbide ceramics has become the first choice for high-temperature kiln furniture for rapid sintering kilns. However, silicon carbide kiln furniture materials have high-temperature oxide problems, that is, high-temperature oxidation products will undergo volume expansion. , causing cracks in kiln furniture materials and directly affecting the service life and quality of kiln furniture; there are also alumina as kiln furniture materials, due to the limitations of the nature of alumina itself, the kiln furniture materials produced have large shrinkage, low density, and porosity. Large size and difficult to control, poor thermal shock stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]A method for preparing heat-shock-resistant cordierite refractory kiln furniture, comprising the following steps: step 1, taking 75% of coal gangue and 25% of component oxides in sequence by weight percentage, and crushing the coal gangue until the particle size is ≤1mm , the coal gangue and component oxides are mixed and ball milled, and then calcined at 1250°C for 18 hours to obtain mixed calcined clinker, which is added to a high-temperature resistance furnace at 1800°C for melting for 2 hours, and then high-speed centrifuge The spinning machine sprays or spins the melted stream to produce ceramic fibers for later use; wherein, the component oxides are 60% Al by weight. 2 o 3 , 20% SiO2 2 and 20% MgO composition, of which, Al 2 o 3 fibrous nano-Al 2 o 3 .

[0026] Step 2: Dry the glass fiber in an oven at 120°C for 2 hours, then add it to the rare earth modifier solution with a volume concentration of 2% in a weight ratio of 100:3, stir for 2 hours, and then dry...

Embodiment 2

[0029] A method for preparing heat-shock resistant cordierite refractory kiln furniture, comprising the following steps: step 1, taking 90% of coal gangue and 10% of component oxides in sequence by weight percentage, crushing the coal gangue to a particle size of ≤1mm, The coal gangue and component oxides are mixed and ball-milled, and then calcined at 2300°C for 3 hours to obtain mixed calcined clinker. After the mixed calcined clinker is added to a high-temperature resistance furnace at 1850°C for melting for 2 hours, high-speed centrifugal throwing The silk machine sprays or spins the melted stream to produce ceramic fibers for later use; wherein, the component oxides are 10% Al by weight. 2 o 3 , 50% SiO 2 and 40% MgO composition, of which, Al 2 o 3 fibrous nano-Al 2 o 3 .

[0030] Step 2: Dry the glass fiber in an oven at 120°C for 2 hours, then add it to the rare earth modifier solution with a volume concentration of 2% in a weight ratio of 100:3, stir for 2 hours,...

Embodiment 3

[0033] A method for preparing heat-shock-resistant cordierite refractory kiln furniture, comprising the following steps: step 1, taking 60% of coal gangue and 40% of component oxides in sequence by weight percentage, crushing the coal gangue to a particle size of ≤1mm, The coal gangue and component oxides are mixed and ball-milled, and then calcined at 900°C for 24 hours to obtain mixed calcined clinker. After the mixed calcined clinker is added to a high-temperature resistance furnace at 2300°C for melting for 2 hours, the high-speed centrifugal The silk machine sprays or spins the melted stream to produce ceramic fibers for later use; wherein, the component oxides are 40% Al by weight. 2 o 3 , 35% SiO 2 and 25% MgO composition, where Al 2 o 3 fibrous nano-Al 2 o 3 .

[0034] Step 2: Dry the glass fiber in an oven at 120°C for 2 hours, then add it to the rare earth modifier solution with a volume concentration of 2% in a weight ratio of 100:3, stir for 2 hours, and then...

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PUM

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Abstract

The invention relates to an anti-thermal shock iolite fireproof kiln furniture and a preparation method thereof. The fireproof kiln furniture comprises the raw materials of 25-37% of a matrix, 50-56% of an aggregate, 4-5% of a sintering agent and 9-14% of a fiber reinforced material, wherein the matrix is composed for 15-25% of kyanite fine powder, 15-25% of kaolin fine powder, 48-69% of and alusite fine powder, and 1-2% of magnesia fine powder, and the aggregate is composed for 60-75% of gangue and 25-40% of high bauxitic clay clinker. In the prepared fireproof material, acicular iolite and cylindrical mullite are interlaced to a net state, the particles are in a free state with uniform size, the matrix and the particles have a certain buffer area, a certain stress is absorbed, and crack dynamic expansion is avoided. An iolite-mullite multiphase is generated in the fireproof product, synchronous increase of flexural intensity and compression strength can be satisfied, and the heat stability of the final product is increased.

Description

technical field [0001] The invention relates to refractory materials, in particular to a preparation method of thermal shock-resistant cordierite refractory kiln furniture. Background technique [0002] In the ceramic industry, kiln furniture plays a role in supporting and protecting ceramic products, and its performance directly affects the quality of products. During the sintering operation of the kiln, a large number of refractory kiln furniture is required to place or isolate the fired parts. Refractory kiln furniture is a vulnerable part. Traditional kiln furniture materials have a large thermal expansion coefficient and poor thermal shock resistance, resulting in low kiln efficiency. Restricted the development of the ceramic industry. [0003] Coal gangue is solid waste generated during coal mining and washing and processing, and is one of the largest industrial solid wastes currently discharged. There are more than 1,500 coal gangue hills in the country, covering an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/185C04B35/622
CPCC04B35/185C04B35/622C04B35/66C04B2235/3206C04B2235/3217C04B2235/3463C04B2235/349C04B2235/5216C04B2235/5248C04B2235/9607
Inventor 顾永军李丽华胡伟黄金亮李谦
Owner HENAN UNIV OF SCI & TECH
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