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Preparation method of superlight closed-pore ceramic

An ultra-light, closed-cell technology, applied in the field of foam ceramics preparation, can solve the problems of difficult control of foam stability, and achieve the effects of saving glue removal process, low density and low raw material cost

Inactive Publication Date: 2014-09-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easier to prepare foam ceramics with higher porosity, but the foam stability is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Preparation of alumina ultra-light closed-cell foam ceramics

[0017] Select 10% alumina particles, mix with 90% water, and ball mill for 20 hours to obtain alumina slurry. 0.01% of anionic surfactant was added therein and stirred at high speed (1500 rpm). The obtained particle-stabilized foam slurry was dried in air for 24 hours, and then sintered in an air atmosphere at 1550° C. for a holding time of 2.5 hours. The density of the obtained ceramic foam is 0.2g / cm 3 , The closed porosity is 90%, the pore diameter is 50μm, and it is evenly distributed in the ceramic sintered body.

Embodiment 2

[0018] Embodiment 2: the preparation of silicon nitride ultra-light closed-cell ceramics

[0019] Select 30% silicon nitride particles, mix with 70% water, and ball mill for 20 hours to obtain silicon nitride slurry. 1% Triton was added therein and stirred at high speed (1500 rpm). The obtained particle-stabilized foam was dried in the air for 24 hours, and then sintered in a nitrogen atmosphere at 1790° C. for 1.8 hours. The density of the obtained ceramic foam is 0.7g / cm 3 , The closed porosity is 80%, and the pore diameter is 80μm, which is evenly distributed in the ceramic sintered body.

Embodiment 3

[0020] Example 3: Preparation of zirconia closed-cell ultra-light ceramics

[0021] Select 50% zirconia particles, mix with 50% water, and ball mill for 10 hours to obtain zirconia slurry. Add 5% cetyltrimethylammonium bromide and stir at high speed (1500rpm). The obtained particle-stabilized foam was dried in the air for 24 hours, and then sintered under a nitrogen atmosphere at 1770 degrees for a holding time of 2 hours. The density of the obtained ceramic foam is 0.2g / cm 3 , The closed porosity is 90%, the pore size is 50μm, and it is evenly distributed in the ceramic sintered body.

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Abstract

The invention discloses a preparation method of a superlight closed-pore ceramic, belonging to the technical field of inorganic nonmetallic materials. The superlight closed-pore ceramic comprises the following raw materials by weight percent: 5%-60% of ceramic particles, 0.01%-5% of a foaming agent and the balance of water. The preparation method comprises the steps of mixing the ceramic particles and a long-chain surfactant with the water according to a ratio to obtain granular stable foam; directly drying the foam, and sintering at high temperature to obtain the superlight closed-pore ceramic. The superlight closed-pore ceramic is uniform in pore, high in closed porosity, low in density and high in strength, and is suitable for preparing foam ceramic materials with different sizes and complicated shapes. In addition, the superlight closed-pore ceramic is relatively high in strength and relatively low in volume density and heat conductivity coefficient; the preparation method has the characteristics of low cost, simple process, environmental friendliness and the like, and has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of preparation of foam ceramics, in particular to a preparation method of ultra-light closed-cell ceramics. Background technique [0002] Ceramic foam refers to a ceramic material with a large number of pores that communicate with each other or are closed. Due to the interpenetrating micropores or cavities inside, it has many excellent properties such as low density, good permeability, low thermal conductivity, high temperature resistance, wear resistance, corrosion resistance, etc., and is widely used in energy, biology, Chemical industry, construction, aerospace and many other fields. The performance and application range of foamed ceramics are determined by factors such as the size, shape, quantity and distribution of the pores, as well as the nature of the material itself. Therefore, the stability of foam is an important factor affecting the performance of foam ceramics. How to prepare closed-pore por...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/632
Inventor 杨金龙齐飞许杰吴甲民苏振国王亚利
Owner TSINGHUA UNIV
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