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Ceramic with mullite structure as well as preparation method and application thereof

A technology of mullite and ceramics, which is applied in the direction of inorganic raw material artificial filaments, can solve the problems of poor performance of fiber products, slow development of research and development of continuous mullite fiber, etc., achieve high elastic modulus, shorten the required time, low cost effect

Inactive Publication Date: 2018-08-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research and development of the preparation of continuous mullite fiber in my country is relatively slow, the performance of fiber products is relatively poor, the application value is significantly lower than that of foreign products of the same type, and the production process is also behind foreign production units. Therefore, it is urgent to develop a new type of mullite fiber. Continuous mullite ceramic fiber with light weight, high flexibility and high strength, and its preparation method suitable for mass production
At the same time, after searching, it was found that in the form of crystalline Al 4 B 2 o 9 phase as the main phase and contains amorphous ceramics with a mullite structure, which has rarely been reported in the relevant literature

Method used

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  • Ceramic with mullite structure as well as preparation method and application thereof
  • Ceramic with mullite structure as well as preparation method and application thereof
  • Ceramic with mullite structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Step 1: Preparation of precursor sol

[0062] Add 15g of aluminum hypoacetate added with boric acid as a stabilizer to a mixed solvent consisting of 40g of alcohol and 40g of deionized water, dissolve and add 7.2g of ethyl orthosilicate, and stir the mixed solution at 45°C for 12h to obtain a colorless and transparent Aluminum-silicon composite precursor sol products;

[0063] Step 2: Concentration and centrifugation of the precursor sol

[0064] Concentrate the precursor sol at 35°C until it can be drawn into filaments with a length greater than 0.5m with a glass rod, then stop the concentration, and the concentrated solution is centrifuged and degassed to obtain a colorless and translucent spinning solution;

[0065] Step 3: Dry spinning

[0066] The spinning solution obtained in step 2 is transferred to a liquid storage tank with a nozzle, and the dry spinning technology is used for spinning, the diameter of the spinneret hole is 80 μm, and the linear speed of the ...

Embodiment 2

[0071] Steps 1, 2, and 3 are the same as in Example 1. The difference is that in step 4, the precursor fiber was taken out and cooled after being kept at 800°C for 0.5h, and then kept at 900°C for 0.2h.

[0072] The resulting lightweight, high-flexibility and high-strength continuous mullite ceramic fiber is smooth and continuous, and the phase structure is Al 4 B 2 o 9 Phase and amorphous silica (the theoretical content of amorphous silica in the product is 24%), the diameter is in the range of 7-12μm, and the density is 2.69g / cm 3 , the tensile strength of monofilament is 1.22GPa, and the modulus of elasticity is 157GPa.

Embodiment 3

[0074] Step 1: Preparation of precursor sol

[0075] Add 15g of aluminum hypoacetate added with boric acid as a stabilizer to a mixed solvent consisting of 50g of alcohol and 50g of deionized water, dissolve and add 9.0g of ethyl orthosilicate, and stir the mixed solution at 40°C for 12h to obtain a colorless and transparent Aluminum-silicon composite precursor sol products;

[0076] Step 2: Concentration and centrifugation of the precursor sol

[0077] Concentrate the precursor sol at 35°C until it can be drawn into filaments with a length greater than 0.5m with a glass rod, then stop the concentration, and the concentrated solution is centrifuged and degassed to obtain a colorless and translucent spinning solution;

[0078] Step 3: Dry spinning

[0079] The spinning solution obtained in step 2 is transferred to a liquid storage tank with a nozzle, and the dry spinning technology is used for spinning, the diameter of the spinneret hole is 120 μm, and the linear speed of the...

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Abstract

The invention relates to ceramic with a mullite structure as well as a preparation method and application thereof. The ceramic has a crystalline-state A14B209 phase and amorphous silicon dioxide, wherein amorphous silicon dioxide accounts for 18% or more of total mass of the ceramic; density of the ceramic is smaller than 2.8g / cm<3>; after ceramic is prepared into filaments, monofilament tensile strength is 1.2-1.8 GPa, and elastic modulus is 140-180 GPa. The preparation process is a classical single-phase mullite sol-gel method, and is used for preparing a product with low density, high toughness and high strength by optimizing types and dosage of components. The preparation method disclosed by the invention has the advantages of being wide in raw material source, low in cost, simple andcontrollable in preparation process, short in time consumption, relatively low in requirement on production environment and equipment, good in product repeatability, liable to recycle a solvent, suitable for industrial production and the like. A product designed and prepared by the preparation method can be applied to the fields such as thermal insulation, national defense and military industry, aerospace, and environmental protection of chemical industry.

Description

technical field [0001] The invention relates to a ceramic with a mullite structure and its preparation method and application, belonging to the technical field of inorganic non-metallic materials. Background technique [0002] Mullite ceramics are widely used in thermal insulation, military and national defense, aerospace, chemical and environmental protection and other fields due to their low thermal conductivity, good high temperature stability, and small specific heat. There are many kinds of mullite ceramic products, the most common one is mullite fiber, its unique structure expands the application field of mullite ceramics. With the advancement of science and technology, the performance requirements of mullite fiber in various application fields are getting higher and higher, and mullite with light weight, flexibility, flexibility, high strength and braidable structure and stable mechanical properties under high temperature conditions has been prepared. Fiber products ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/622D01F9/08
CPCC04B35/01C04B35/62231C04B2235/3418D01F9/08
Inventor 马运柱宋晓雷王娟刘文胜徐书恒刘静
Owner CENT SOUTH UNIV
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