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High-strength foamed ceramic and preparation method thereof

A foamed ceramic and high-strength technology, applied in the field of ceramic materials, can solve the problems of low thermal conductivity, difficulty in balancing mechanical properties and thermal insulation properties, and achieve the effect of improving strength

Active Publication Date: 2022-03-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a high-strength foamed ceramic and its preparation method to solve the difficult balance of mechanical properties and thermal insulation properties of existing foamed ceramics, to achieve high-strength, low thermal conductivity foamed ceramics for light Preparation of quality wall materials

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  • High-strength foamed ceramic and preparation method thereof
  • High-strength foamed ceramic and preparation method thereof
  • High-strength foamed ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for preparing high-strength foamed ceramics, the steps are as follows:

[0034] a. Select 3.5kg fly ash, 6.0kg potassium feldspar, 0.5kg soda ash as raw materials, add 25g of SiC micropowder as foaming agent, and mix for 6 hours by dry ball milling to make a foamed ceramic blank with a particle size of <75μm ;

[0035] b. Add 200gCr to the billet 2 o 3 As a crystal nucleating agent, 300g of polycrystalline mullite fiber is used as a reinforcing agent, and tap water is added according to a water-cement ratio of 1:1, and stirred at high speed in a planetary paddle mixer for 15 minutes to make a uniform slurry;

[0036] c. Dry the slurry in a spray dryer to make powder, and fill it in a refractory mold covered with refractory fiber paper, with a thickness of 6±1mm. In the tunnel kiln, the temperature was raised to 1200°C at a heating rate of 5°C / min and kept for 80 minutes.

[0037] d. Cool in the kiln to 870°C at a rate of 15°C / min, k...

Embodiment 2

[0044] This embodiment provides a method for preparing high-strength foamed ceramics, the steps are as follows:

[0045] a. Select 6.2kg of coal gangue, 3.0kg of chrome slag, and 0.8kg of soda ash as raw materials, add 28g of SiC micropowder as a foaming agent, and mix for 6 hours by dry ball milling to make a foamed ceramic blank with a particle size of <75 μm;

[0046] b. Add 200g of alumina fiber to the billet as a reinforcing agent, and add tap water according to the water-cement ratio of 1:1, and stir at high speed in a planetary paddle mixer for 10 minutes to make a uniform slurry;

[0047] c. Dry the slurry in a spray dryer to make powder, and fill it in a refractory mold covered with refractory fiber paper, with a thickness of 5±1mm. In the tunnel kiln, the temperature was raised to 1220°C at a heating rate of 5°C / min and kept for 60 minutes.

[0048] d. Cool in the kiln to 935°C at a rate of 15°C / min, keep warm for 3 hours, then cool to room temperature at 2°C / min, t...

Embodiment 3

[0053] The preparation method of this example is the same as that of Example 1, the only difference being that 300 g of polycrystalline mullite fiber is not added to the billet as a reinforcing agent.

[0054] The performance of the foamed ceramics obtained is as follows:

[0055] Table 3 Properties of foamed ceramic wall materials

[0056]

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Abstract

The invention discloses a high-strength foamed ceramic and a preparation method thereof, and the preparation method comprises the following steps: (1) preparing a foamed ceramic raw material and an auxiliary agent into slurry, and drying to prepare powder; in the auxiliary agent, silicon carbide is used as a foaming agent, chromic oxide and / or a substance containing chromic oxide are / is used as a nucleating agent, and inorganic chopped fibers are used as a reinforcing agent; (2) putting the powder into a mold, and sintering; and (3) after firing, cooling and demolding to obtain the high-strength foamed ceramic. According to the preparation method, Cr2O3 is adopted as a nucleation agent and is cooled to a crystallization temperature point for heat preservation, so that a glass phase in a matrix is promoted to form high-strength mullite and quartz crystals, the strength of the matrix is improved, formation and growth of pores in a melt at a high temperature are not affected, and the prepared foamed ceramic has a good pore structure and excellent mechanical properties.

Description

technical field [0001] The invention relates to a high-strength foamed ceramic and a preparation method thereof, belonging to the technical field of ceramic materials. Background technique [0002] Foamed ceramics is a two-phase closed-cell ceramic material composed of a continuous solid-phase skeleton and closed pores. High-performance inorganic thermal insulation wall material with long life. Good thermal insulation performance and mechanical properties are important supports for foamed ceramics to be used as wall materials. The thermal insulation performance of foamed ceramics can be effectively improved by reducing the bulk density of the material, but the strength of foamed ceramics is seriously reduced. Therefore, the mechanical properties and thermal insulation properties of foamed ceramics are mutually restricted. Due to the requirement of the structural strength of the building, only about 400kg / m of bulk density can be selected at present 3 The foamed ceramics a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/80C04B35/622C04B35/19
CPCC04B38/02C04B35/19C04B35/62204C04B2235/3201C04B2235/3241C04B2235/5224C04B2235/5228C04B2235/77C04B2235/96C04B2235/9607
Inventor 周明凯陈潇王怀德林方亮
Owner WUHAN UNIV OF TECH
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