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Calcium feldspar porous ceramics with controllable structure and adjustable performance and preparation method thereof

A technology of porous ceramics and anorthite, which is applied in the field of anorthite porous ceramics and its preparation, can solve problems such as limiting high-temperature applications, affecting high-temperature performance, and low purity, and achieves high green strength, high uniformity, and high purity Effect

Inactive Publication Date: 2014-11-05
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the currently studied anorthite porous ceramics have low purity, which affects their high-temperature performance and limits their high-temperature applications.

Method used

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  • Calcium feldspar porous ceramics with controllable structure and adjustable performance and preparation method thereof
  • Calcium feldspar porous ceramics with controllable structure and adjustable performance and preparation method thereof
  • Calcium feldspar porous ceramics with controllable structure and adjustable performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a specific example of the preparation method of anorthite porous ceramics of the present invention, the raw material used is γ-Al 2 o 3 (9um), CaCO 3 (0.8um) and SiO 2 (4um), the purity is analytically pure, and the molar ratio of ingredients is 1:1:2. The detailed preparation steps are as follows:

[0031] 1) Prepare the premix;

[0032] The solid content of the ceramic slurry is 12vol.%. Weigh 88g of deionized water into the beaker, weigh 8.8g of acrylamide powder and add it to the above beaker, weigh 0.88g of N,N'-methylenebisacrylamide and add it to the above beaker, and weigh 0.17g of ammonium polyacrylate Place in the above beaker. Then use JJ-1 type precision booster electric stirrer to mechanically stir to prepare the premix, the stirring speed is 2000 rpm, and the stirring time is about 30 minutes.

[0033] 2) preparing a homogeneously mixed ceramic slurry;

[0034] First, pour the above-mentioned homogeneously mixed premix into a ball mill jar equip...

example 1

[0043] The purity of the anorthite porous ceramics finally prepared by example 1 is higher, and only the diffraction peak of anorthite can be observed in the XRD diffraction pattern, and the diffraction pattern is as shown in accompanying drawing 1 (a); Prepare the pores of anorthite porous ceramics It is a multi-level structure, and submicron pores are distributed on the spherical large pore wall. The typical microstructure is shown in Figure 2 (a); the physical properties of the prepared anorthite porous ceramics are as follows: the apparent porosity is 91.4± 0.5%, bulk density 0.24±0.01g / cm 3 , Room temperature vacuum thermal conductivity 0.018±0.005W / m·K.

Embodiment 2

[0045] The raw material used is γ-Al 2 o 3 (9um), CaCO 3 (0.8um) and SiO 2 (4um), the purity is analytically pure, and the molar ratio of ingredients is 1:1:2. The detailed preparation steps are as follows:

[0046] 1) Prepare the premix;

[0047] The solid content of the ceramic slurry is 12vol.%. Weigh 44g of deionized water into the beaker, weigh 4.4g of acrylamide powder into the above beaker, weigh 0.44g of N,N'-methylenebisacrylamide into the above beaker, and weigh 0.085g of ammonium polyacrylate Place in the above beaker. Then use JJ-1 type precision booster electric stirrer to mechanically stir to prepare the premix, the stirring speed is 2000 rpm, and the stirring time is about 30 minutes.

[0048] 2) preparing a homogeneously mixed ceramic slurry;

[0049] First, pour the above-mentioned homogeneously mixed premix into a ball mill jar equipped with a certain amount of agate balls; then weigh 6.23g SiO 2 , 5.285gγ-Al 2 o 3 and 5.185g CaCO 3 Pour into the ...

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Abstract

The invention provides calcium feldspar porous ceramics with controllable structure and adjustable performance; the invention also provides a preparation method of the calcium feldspar porous ceramic with controllable structure and adjustable performance. Because the preparation method has the advantages of both a mechanical foaming method and a gel injection molding method, the prepared calcium feldspar porous ceramics have excellent physical properties: the apparent porosity is 61.23%-90.19%, the volume density is 0.26-1.04 g / cm<3>, the compressive strength is 0.27-13.39 MPa, and the room-temperature vacuum thermal conductivity is 0.018-0.27 W / m.K.

Description

technical field [0001] The invention relates to an anorthite porous ceramic, in particular to an anorthite porous ceramic with controllable structure and adjustable performance and a preparation method thereof. Background technique [0002] Porous ceramics are widely used in heat insulation, catalyst support and filtration due to their low density, low thermal conductivity, high strength and excellent high temperature performance. Materials used as porous ceramic substrates mainly include corundum, mullite, cordierite, zirconia, anorthite and silicon carbide. Among them, anorthite has a higher melting point (1550°C), lower density (2.74-2.76g / cm 3 ), lower coefficient of thermal expansion (4.82×10 -6 K -1 ) and low thermal conductivity (3.67W / (m K)), which are considered as excellent candidates for thermal insulation. [0003] At present, the commonly used preparation methods of anorthite porous ceramics include foaming method and adding pore-forming agent. For example,...

Claims

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Application Information

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IPC IPC(8): C04B35/22C04B35/622C04B38/10
Inventor 李翠伟韩耀边超
Owner BEIJING JIAOTONG UNIV
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