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Mullite whisker/fiber synergistically reinforced silicon dioxide aerogel multi-scale composite structure, preparation method and application thereof

A technology of mullite whisker and composite structure, applied in the field of ceramic compositions, can solve the problems of inability to meet large-scale mass production, complex equipment, failure and the like

Inactive Publication Date: 2020-06-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure SiO 2 The unique loose porous network skeleton structure of airgel is an oxygen covalent bond structure formed by the condensation of precursors. The weak strain of the covalent bond itself makes the airgel material brittle and poor in mechanical properties, resulting in air condensation under a certain external force. The structure of the glue itself collapses, fails and other problems, this defect greatly limits the SiO 2 Solo use of airgel
At the same time, as a commonly used airgel preparation method, supercritical drying has high cost, complicated equipment, and cannot meet the requirements of large-scale batch production.

Method used

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  • Mullite whisker/fiber synergistically reinforced silicon dioxide aerogel multi-scale composite structure, preparation method and application thereof
  • Mullite whisker/fiber synergistically reinforced silicon dioxide aerogel multi-scale composite structure, preparation method and application thereof
  • Mullite whisker/fiber synergistically reinforced silicon dioxide aerogel multi-scale composite structure, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Weigh the silica sol, add deionized water therein to dilute, stir to obtain the silica sol dilution, the concentration of the silica sol dilution is 0.033mol / L; then aluminum silicate fiber felt (untreated SEM image of aluminum silicate fiber felt as figure 1 Shown) immersed in the silica sol diluent, impregnated for 0.5 under vacuum conditions, then frozen below 0°C until the impregnated liquid became solid, and then placed the frozen solid in a freeze dryer for freeze-drying;

[0051] (2) weigh aluminum nitrate, take deionized water as solvent preparation aluminum nitrate solution, its concentration is 0.10mol / L; The concentration of this aluminum nitrate solution is 3 times of silica sol dilution concentration in step (1); The dried aluminum silicate fiber felt in step (1) is immersed in the aluminum nitrate solution for 0.5h under vacuum conditions, and then frozen below 0°C until the impregnation solution freezes into a solid, and then the frozen solid is place...

Embodiment 2

[0068] (1) Weigh the silica sol, add deionized water therein to dilute, stir to obtain the silica sol dilution, the concentration of the silica sol dilution is 0.10mol / L; then immerse the aluminum silicate fiber felt into the silica sol dilution, Impregnated under vacuum conditions for 0.5, then frozen below 0°C until the impregnated liquid became solid, and then placed the frozen solid in a freeze dryer for freeze-drying;

[0069] (2) weigh aluminum nitrate, take deionized water as solvent preparation aluminum nitrate solution, its concentration is 0.30mol / L; The concentration of this aluminum nitrate solution is 3 times of silica sol dilution concentration in step (1); The dried aluminum silicate fiber felt in step (1) is immersed in the aluminum nitrate solution for 0.5h under vacuum conditions, and then frozen below 0°C until the impregnation solution freezes into a solid, and then the frozen solid is placed in the freezer Freeze drying in a desiccator;

[0070] (3) Weigh...

Embodiment 3

[0088] (1) Weigh the silica sol, add deionized water therein to dilute, stir to obtain the silica sol dilution, the concentration of the silica sol dilution is 0.17mol / L; then immerse the aluminum silicate fiber felt into the silica sol dilution, Impregnated under vacuum conditions for 0.5, then frozen below 0°C until the impregnated liquid became solid, and then placed the frozen solid in a freeze dryer for freeze-drying;

[0089] (2) weigh aluminum nitrate, take deionized water as solvent preparation aluminum nitrate solution, its concentration is 0.50mol / L; The concentration of this aluminum nitrate solution is 3 times of silica sol dilution concentration in step (1); The dried aluminum silicate fiber felt in step (1) is immersed in the aluminum nitrate solution for 0.5h under vacuum conditions, and then frozen below 0°C until the impregnation solution freezes into a solid, and then the frozen solid is placed in the freezer Freeze drying in a desiccator;

[0090] (3) Weigh...

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Abstract

The invention discloses a mullite whisker / fiber synergistically reinforced SiO2 aerogel multi-scale composite structure, a preparation method and application thereof. According to the method, a mullite whisker / fiber reinforcement and a SiO2 aerogel are combined through physical and chemical methods, and a multi-scale composite structure with certain resilience, mechanical strength and low heat conductivity coefficient can be prepared through micron and submicron scale synergistic reinforcement. According to the invention, the conditions that single-scale fiber reinforcement has defects and theactual application requirements cannot be met due to poor mechanical properties of pure SiO2 aerogel are avoided, and the preparation conditions of the SiO2 aerogel composite material are reduced.

Description

technical field [0001] The invention relates to the technical field of ceramic compositions, in particular to a mullite whisker / fiber synergistically reinforced silica (SiO 2 ) Airgel multi-scale composite structure and its preparation method and application. Background technique [0002] Fiber reinforcement method as an effective way to improve SiO 2 Methods for the mechanical properties of airgel are widely used, but both short and long fibers currently used are deficient. Although short fiber reinforcement improves the mechanical properties of airgel materials, the combination of short fibers and airgel materials is poor, and the overall brittleness of the material is still relatively large. Although long-fiber reinforcement significantly improves the strength and toughness of aerogels, the fibers and aerogels are easy to separate under the action of external loads, which makes it difficult to meet the long-term use requirements. [0003] Mullite material has good high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02C04B41/64C04B111/40
CPCC04B30/02C04B41/009C04B41/4933C04B41/64C04B2111/40C04B2201/32C04B14/064C04B14/4656C04B14/383C04B41/4535C04B41/463
Inventor 侯峰张涛易喆涵刘佳朋
Owner TIANJIN UNIV
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