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A kind of mullite-based ceramic material and preparation method thereof

A ceramic material, mullite-based technology, applied in the field of refractory ceramic materials, can solve the problems of difficult dispersion of whiskers, poor dispersion uniformity, and high production difficulty, and achieve the goals of reducing calcination time, high whisker content, and reducing sintering time Effect

Active Publication Date: 2022-03-08
长沙中瓷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to improve the strength and toughness of mullite ceramic materials, two methods of external introduction and in-situ self-generation can be used. The external introduction method is to introduce the prepared whiskers into the matrix, although it can play the role of toughening and strengthening. , but if added in a large amount (more than 30wt%), there will be problems of whisker dispersion difficulty and poor dispersion uniformity, resulting in poor effect; Whiskers are generated in situ during the sintering process and dispersed evenly, but the in situ self-generation method requires a long time of heating and calcination to grow whiskers of a certain size. To achieve a better toughening and strengthening effect, it is necessary to accurately grasp The calcination time and calcination temperature are difficult to produce

Method used

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  • A kind of mullite-based ceramic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] The preparation of mullite seed crystal comprises the following steps:

[0032] According to the ratio of ethyl orthosilicate, aluminum nitrate and ethanol in the ratio of 3mol:2mol:1L, mix 0.3mol ethyl orthosilicate and 0.2mol aluminum nitrate and add them to 100mL of ethanol, then add dropwise 1mol / L hydrochloric acid solution to a pH of 2, reacted at 60°C for 3 hours to obtain a silica-alumina sol, added 4 mol / L ammonia water to the silica-alumina sol dropwise until the pH was 6, and reacted at 60°C for 10 hours to obtain a silica-alumina sol Aluminum gel, drying the silica-alumina gel at 70°C, calcining at 1000°C, and cooling to obtain highly active mullite seeds with a diameter of 52-55nm and a length of 1.5-1.7μm.

[0033] The preparation of phosphate binder comprises the following steps:

[0034] Step A1, Al(OH) 3 Added to H with a mass fraction of 60% 3 PO 4 In solution, Al(OH) 3 with H 3 PO 4 The molar ratio of the solute in the solution is 5:4 to obtain...

Embodiment 2

[0042] The preparation of mullite seed crystal comprises the following steps:

[0043] According to the ratio of ethyl orthosilicate, aluminum nitrate and ethanol in the ratio of 3mol:2mol:1L, mix 0.3mol ethyl orthosilicate and 0.2mol aluminum nitrate and add them to 100mL of ethanol, then add dropwise 1mol / L hydrochloric acid solution to a pH of 2, reacted at 60°C for 4 hours to obtain a silica-alumina sol, added 4 mol / L ammonia water to the silica-alumina sol dropwise until the pH was 6, and reacted at 60°C for 11 hours to obtain a silica-alumina sol Aluminum gel, drying the silica-alumina gel at 80°C, calcining at 1200°C, and cooling to prepare mullite seed crystals with a diameter of 58-63nm and a length of 1.6-1.8μm.

[0044] The preparation of phosphate binder comprises the following steps:

[0045] Step A1, Al(OH) 3 Added to H with a mass fraction of 60% 3 PO 4 In solution, Al(OH) 3 with H 3 PO 4 The molar ratio of the solute in the solution is 5:4 to obtain a mi...

Embodiment 3

[0053] The preparation of mullite seed crystal comprises the following steps:

[0054] According to the ratio of ethyl orthosilicate, aluminum nitrate and ethanol in the ratio of 3mol:2mol:1L, mix 0.3mol ethyl orthosilicate and 0.2mol aluminum nitrate and add them to 100mL of ethanol, then add dropwise 1mol / L hydrochloric acid solution to pH 2, react at 60°C for 5 hours to obtain silica-alumina sol, add 4 mol / L ammonia water to the silica-alumina sol dropwise to pH 6, and react at 60°C for 12 hours to obtain silica Aluminum gel, drying the silica-alumina gel at 90°C, calcining at 1300°C, and cooling to prepare mullite seed crystals with a diameter of 62-69nm and a length of 1.7-2.0μm.

[0055] The preparation of phosphate binder comprises the following steps:

[0056] Step A1, Al(OH) 3 Added to H with a mass fraction of 60% 3 PO 4 In solution, Al(OH) 3 with H 3 PO 4 The molar ratio of the solute in the solution is 5:4 to obtain a mixed solution, which is heated to 85°C ...

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Abstract

The invention relates to a mullite-based ceramic material and a preparation method thereof, belonging to the technical field of refractory ceramic materials. The preparation method specifically includes the following steps: step S1, mixing and ball milling raw materials to obtain mixed powder; step S2, mixing the mixed powder , phosphate binder and polyvinyl alcohol aqueous solution are stirred and mixed, and stale to obtain the stale material; step S3, molding and drying the stale material to obtain a dry body; step S4, placing the dry body on a bedding lined with fluorine trihydrate Inside the corundum crucible of aluminum powder, heat treatment is carried out after being covered, and after cooling, the mullite-based ceramic material is obtained; the mullite-based ceramic material prepared by the above preparation method not only has a higher whisker content, but also has different sizes The large and small whiskers are evenly distributed in the matrix, and the phosphate binder has a synergistic effect with the acicular mullite whiskers formed in situ at the tiny gaps, which improves the strength and toughness of the mullite-based ceramic materials.

Description

technical field [0001] The invention belongs to the technical field of refractory ceramic materials, and in particular relates to a mullite-based ceramic material and a preparation method thereof. Background technique [0002] Mullite has the advantages of high refractoriness, excellent high temperature creep resistance, good chemical stability and thermal stability, etc., and is widely used in high temperature industrial kilns. Higher requirements are put forward. In order to prolong the service life of mullite ceramic kiln furniture and reduce the probability of bursting of mullite ceramic kiln furniture during use, mullite ceramic materials are required to have higher strength and toughness; [0003] In order to improve the strength and toughness of mullite ceramic materials, two methods of external introduction and in-situ self-generation can be used. The external introduction method is to introduce the prepared whiskers into the matrix, although it can play the role of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/81C04B35/185C04B35/63C04B35/634
CPCC04B35/185C04B35/6306C04B35/63416C04B35/80C04B2235/3244C04B2235/6562C04B2235/6567C04B2235/96
Inventor 何江
Owner 长沙中瓷新材料科技有限公司
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