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Light heat-insulating high-strength mullite material and preparation method thereof

A light heat insulation and mullite technology, applied in the field of preparation of biomimetic porous ceramic materials, can solve the problems of low whisker frame strength and difficulty in achieving high-strength sintering, and achieve low thermal conductivity, increased strength, and high porosity The effect of rate and mechanical strength

Active Publication Date: 2020-06-05
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the whisker frame strength obtained here is lower
The reason is that there is a solid-state sintering mechanism between the whiskers, and it is difficult to achieve high-strength sintering at 1500 °C.

Method used

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  • Light heat-insulating high-strength mullite material and preparation method thereof

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preparation example Construction

[0023] A method for preparing a lightweight heat-insulating high-strength mullite material, comprising the following steps:

[0024] Step 1: Preparation of porous mullite whisker framework: firstly, ball mill nano-alumina powder and aluminum fluoride powder to obtain slurry A; then make sol with TEOS, water and ethanol; finally mix sol and slurry Material A is mixed to obtain slurry B, and under the catalysis of ammonia water, the gel effect of slurry B occurs. After the gel is thoroughly dried, the raw material powder of mullite whiskers is obtained, wherein the molar ratio of Al:Si is 3:1. Then the green body is made by dry pressing, and after high temperature sintering in a closed crucible, a porous mullite whisker framework is obtained.

[0025] Step 2: Preparation of dense mullite coating on the surface of the porous mullite whisker framework: Al with a particle size of 500 nm 2 o 3 powder, 30nm SiO 2 Powder and PVA binder are uniformly mixed by ball milling to obtain...

Embodiment 1

[0029] This embodiment combines a method for preparing a lightweight heat-insulating high-strength mullite material, including the following steps:

[0030] Step 1: Preparation of porous mullite whisker framework: firstly, ball mill nano-alumina powder and aluminum fluoride powder to obtain slurry A; then make sol with TEOS, water and ethanol; finally mix sol and slurry Material A is mixed to obtain slurry B, and under the catalysis of ammonia water, the gel effect of slurry B occurs. After the gel is thoroughly dried, the raw material powder of mullite whiskers is obtained, wherein the molar ratio of Al:Si is 3:1. Then the green body is made by dry pressing, and after sintering at 1300° C. for 5 hours in a relatively closed crucible, a porous mullite whisker framework is obtained.

[0031] Step 2: Preparation of a dense mullite layer on the surface of the whisker framework: Al with a particle size of 500 nm 2 o 3 powder, 30nm SiO 2 The powder and PVA binder were uniformly...

Embodiment 2

[0035] This embodiment combines a method for preparing a lightweight heat-insulating high-strength mullite material, including the following steps:

[0036]Step 1: Preparation of porous mullite whisker framework: firstly, ball mill nano-alumina powder and aluminum fluoride powder to obtain slurry A; then make sol with TEOS, water and ethanol; finally mix sol and slurry Material A is mixed to obtain slurry B, and under the catalysis of ammonia water, the gel effect of slurry B occurs. After the gel is thoroughly dried, the mullite whisker raw material powder is obtained, wherein the molar ratio of Al:Si is 3:1. Then dry press molding to make a green body, and after sintering at 1400° C. for 3 hours in a relatively closed crucible, a porous mullite whisker framework is obtained.

[0037] Step 2: Preparation of a dense mullite layer on the surface of the whisker framework: Al with a particle size of 500 nm 2 o 3 powder, 30nm SiO 2 The powder and the PVA binder were uniformly ...

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Abstract

The invention provides a light heat-insulating high-strength mullite material and a preparation method thereof. The mullite material takes a porous mullite whisker frame as a matrix, and a compact mullite coating covers and is combined on the outer surface of the matrix. The preparation method comprises the following steps: 1, preparing the porous mullite whisker frame and preparing compact mullite precursor slurry; 2, uniformly spraying the compact mullite precursor slurry on the outer surface of the porous mullite whisker frame, and drying to obtain a porous mullite green body; and 3, sintering the porous mullite green body at a high temperature in an air atmosphere to form a compact mullite coating on the outer surface of the porous mullite whisker frame, thereby obtaining the light heat-insulating high-strength mullite material. On the premise of high porosity, the material disclosed by the invention realizes the combination of light weight, heat insulation and high strength.

Description

technical field [0001] The invention relates to the preparation of a bionic porous ceramic material, in particular to a light-weight heat-insulating high-strength mullite material and a preparation method thereof. Background technique [0002] In addition to the advantages of high temperature resistance, corrosion resistance, and high rigidity, porous ceramics also have properties such as light weight, heat insulation (low thermal conductivity), low thermal expansion, and large specific surface area. As a member of porous ceramics, porous silica-alumina-based mullite has outstanding properties such as good thermal shock resistance, high temperature strength, and good high temperature oxidation resistance. The field has broad application prospects. High porosity and low thermal conductivity make porous mullite material especially suitable for thermal insulation protective layer of equipment under high temperature conditions, which can not only effectively reduce resource los...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/81C04B35/185C04B35/84C04B38/00
CPCC04B35/185C04B38/0045C04B2235/3217C04B2235/445C04B2235/483C04B2235/96C04B2235/9607C04B35/803C04B38/0074
Inventor 曾德军王红波桑可正张瑜
Owner CHANGAN UNIV