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In-situ synthesis mullite whisker-toughened ceramic heat accumulator and preparation method thereof

A technology for mullite whiskers and toughened ceramics is applied in the field of in-situ synthesis of mullite whiskers toughened ceramic regenerators and their preparation, which can solve problems such as poor toughness, brittleness and brittleness, and achieve cost-effectiveness. Low, improved fracture performance, simple preparation process

Inactive Publication Date: 2014-05-21
TIANJIN KANGBAO ZHENTE INORGANIC NONMETAL SCI& TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ceramic materials have the disadvantages of brittleness, brittleness and poor toughness.

Method used

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  • In-situ synthesis mullite whisker-toughened ceramic heat accumulator and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the present embodiment, by weight percentage, the main component of the selected coal series kaolin is:

[0037] SiO 2 : 45.08%; Al 2 o 3 : 37.89%; caustic soda: 15.95%; TiO 2 : 0.43%;

[0038] Fe 2 o 3 : 0.2%; MgO: 0.079%; CaO: 0.095%.

[0039] The preparation method comprises the following steps:

[0040] (1) Weigh 280kg of coal-series kaolin and 220kg of alumina micropowder, wherein the mesh number of alumina micropowder is 1000 mesh, the purity is 99%, and the mesh number of coal-series kaolin is 250 mesh.

[0041] (2) Pour the above raw materials into a ball mill, mix and grind for 3 hours, add 500kg of mullite powder that has passed through an 80-mesh sieve, and mix and grind for 3 hours.

[0042] (3) Take 100kg of the mixture obtained in step (2), pour it into a kneader, add 3kg of carboxymethylcellulose, 3kg of water-based acrylic emulsion and 16kg of water, and knead evenly.

[0043] (4) Put the mud material obtained in step (3) into the mud refinin...

Embodiment 2

[0052] In the present embodiment, by weight percentage, the main component of the selected coal series kaolin is:

[0053] SiO 2 : 45.08%; Al 2 o 3 : 37.89%; caustic soda: 15.95%; TiO 2 : 0.43%;

[0054] Fe 2 o 3 : 0.2%; MgO: 0.079%; CaO: 0.095%.

[0055] The preparation method comprises the following steps:

[0056] (1) Weigh 280kg of coal-series kaolin and 230kg of alumina micropowder, of which the mesh number of alumina micropowder is 1000 mesh, the purity is 99%, and the mesh number of coal-series kaolin is 250 mesh.

[0057] (2) Pour the above raw materials into a ball mill, mix and grind for 3 hours, add 500kg of mullite powder that has passed through an 80-mesh sieve, and mix and grind for 3 hours.

[0058] (3) Take 100kg of the mixture obtained in step (2), pour it into a kneader, add 3kg of carboxymethylcellulose, 3kg of water-based acrylic emulsion and 16kg of water, and knead evenly.

[0059] (4) Put the mud material obtained in step (3) into the mud refini...

Embodiment 3

[0068] In the present embodiment, by weight percentage, the main component of the selected coal series kaolin is:

[0069] SiO 2 : 43.28%; Al 2 o 3 : 37.27%; caustic soda: 15.85%; TiO 2 : 0.48%;

[0070] Fe 2 o 3 : 0.2%; MgO: 0.079%; CaO: 0.095%.

[0071] (1) Feed according to the weight ratio of coal series kaolin and alumina micropowder as 100:74, wherein the mesh number of alumina micropowder is 1200 mesh, the purity is 99%, and the particle size of coal series kaolin is 325 mesh.

[0072] (2) Pour the above raw materials into a ball mill, mix and grind for 4 hours, add mullite powder of equal weight that has been pre-passed through a 80-mesh sieve, and mix and grind for 3 hours.

[0073] (3) Take 100kg of the mixture obtained in step (2), pour it into a kneader, add 3kg of carboxymethylcellulose, 4kg of water-based acrylic emulsion and 15kg of water, and knead evenly.

[0074] (4) Add the mud material to the mud refining machine for initial training 3 times, and th...

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Abstract

The invention provides an in-situ synthesis mullite whisker-toughened ceramic heat accumulator and a preparation method thereof. The in-situ synthesis mullite whisker-toughened ceramic heat accumulator is prepared from coal-based kaolin, alumina micro powder, mullite powder, a binding agent, a water solubility plasticizer and water by the steps of mixing materials, kneading mud, pugging, microwave sizing, baking and firing. The heat accumulator prepared by adopting the technical scheme is a composite material formed by high-strength and high-modulus mullite ceramic whisker and mullite matrix. Even mullite whisker is generated between matrix tissues of a microstructure. In addition, the method is simple in preparation technology, low in cost and easy for realization of industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic ceramics, in particular to an in-situ synthesized mullite whisker toughened ceramic regenerator and a preparation method thereof. Background technique [0002] In the regenerative high-temperature air combustion technology, the regenerator is the carrier for recovering the waste heat of the flue gas and preheating the combustion-supporting air. The key to the efficient operation of the technology. [0003] The working environment of the regenerator is extremely harsh, and high requirements have been put forward for its structural shape, heat penetration depth, specific surface area, heat storage capacity, thermal conductivity, thermal shock resistance, heat transfer performance, oxidation resistance, and structural strength. requirements. Considering the above requirements comprehensively, the regenerator is generally made of mullite ceramic body with honeycomb through holes. However, cera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/185C04B35/622
Inventor 张镭
Owner TIANJIN KANGBAO ZHENTE INORGANIC NONMETAL SCI& TECH
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