Method and device for preparing porous ceramic micro beads

A technology of porous ceramics and microbeads, which is applied in the direction of ceramic molding machines and manufacturing tools, which can solve the problems of difficult preparation of ceramic hollow microbeads, and achieve the effects of rich internal cavities, light weight, and good thermal insulation

Inactive Publication Date: 2013-01-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the common hollow ceramic balls are made of silicon oxide (SiO 2 ) and alumina (Al 2 o 3 ) composed of hollow sphere materials or hollow floating beads, however, it is difficult to prepare hollow ceramic spheres other than aluminosilicate glass, especially ceramic hollow microspheres of 0.3-4mm

Method used

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  • Method and device for preparing porous ceramic micro beads
  • Method and device for preparing porous ceramic micro beads
  • Method and device for preparing porous ceramic micro beads

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Preparation of alumina porous ceramic beads

[0041] α-Al 2 O 3 The high-purity powder raw material provided for Henan Jiyuan Aluminum Company, with a purity of greater than 99.99% and an average particle size of 2.35μm. Dissolve 3wt% acrylamide monomer and 0.2wt% crosslinking agent methylene bisacrylamide in 96.8wt% water to make a premixed solution; add alumina powder and ammonium citrate to 100ml of premixed solution for dispersion Alumina ceramic suspension with 28% solid phase volume fraction is made by ball milling for 24 hours, that is, the volume of alumina accounts for 28% of the total volume of the slurry after adding alumina powder, and the addition of ammonium citrate is oxidation 2wt% of aluminum powder. Add 80μl of the initiator ammonium persulfate with a concentration of 1%, 40μl of the catalyst tetramethylethylenediamine with a concentration of 2%, and 3ml of the foaming agent valeric acid with a concentration of 0.02mol / l into the suspension, stirring rap...

Embodiment 2

[0043] Preparation of zirconia porous ceramic beads

[0044] ZrO 2 The powder raw material provided for the Nuclear Energy Technology Design and Research Institute has an average particle size of 0.25μm. Take acrylamide monomer solution, add ammonium citrate and tetramethylammonium hydroxide solution as dispersant, the mass ratio is monomer solution: ammonium citrate: tetramethylammonium hydroxide solution=98:1:3; The concentration of acrylamide in the body solution is 15wt%, and the methylenebisacrylamide is 0.50wt%. Join ZrO 2 The powder is configured into a zirconia suspension with a solid phase volume fraction of 36 vol% and ball milled for 18 hours. Add 0.2ml of the initiator ammonium persulfate with a concentration of 0.5%, 0.1ml of the catalyst tetramethylethylenediamine with a concentration of 0.25%, and 3wt.% zirconia foaming agent butyric acid into the suspension, and stir quickly to make it The foaming is complete, thereby preparing an ultra-stable zirconia foam slur...

Embodiment 3

[0046] Preparation of silicon nitride porous ceramic beads

[0047] Si 3 N 4 It is a commercially available commercial powder with an average particle size of 0.48μm. Mix and dissolve 54.4wt% water, 45wt% hydroxyethyl acrylate and 0.6wt% methylene bisacrylamide to prepare a premixed liquid. Silicon nitride powder is added to the mixture to form a 55vol% silicon nitride slurry, that is, the volume of silicon nitride accounts for 55% of the total volume of the slurry after adding silicon nitride, and ammonium citrate is added as a dispersant, ammonium citrate The added amount is 1% of the mass of the powder, ball milled for 15 hours to make a silicon nitride ceramic suspension. Then 0.4ml of the catalyst tetramethylethylenediamine and 0.2ml of the initiator ammonium persulfate concentration of 10% aqueous solution were added to the slurry, while adding 2wt% (based on the mass of silicon nitride powder) The short-chain amphiphilic propyl gallate was used as a foaming agent, and sti...

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Abstract

The invention discloses a method and a device for preparing porous ceramic micro beads. The method comprises the following steps of: mixing an organic monomer and a crosslinking agent with water according to a certain proportion for dissolving, adding ceramic powder and a dispersing agent into a solution, and performing ball milling to obtain a ceramic suspension with high solid phase content and low viscosity; adding a foaming agent, an initiator and a catalyst into the suspension for stirring to obtain water-based stable foam ceramic slurry; and continuously injecting the water-base slurry into an oily medium of a certain temperature by using the device for preparing the porous ceramic micro beads to form foam slurry spheres, floating and curing into porous ceramic micro bead blanks in the oily medium, collecting, cleaning, drying and sintering to obtain a porous ceramic micro bead product. The invention further discloses a device for preparing the porous ceramic micro beads. The device comprises a micro bead forming tower and an injection gun, and can be used for realizing continuous automatic injection and generation of spheres. The device has universality, and can be used for realizing large-scale continuous production of porous ceramic micro beads which are of different systems and are 0.3-4.0 millimeters in diameter.

Description

Technical field [0001] The invention relates to the technical field of novel ceramic molding, and belongs to the category of special-shaped ceramic parts prepared by a ceramic molding process, in particular to a method and device for preparing porous ceramic microbeads. Background technique [0002] Ceramic hollow sphere refers to a spherical material with a hollow structure obtained by natural or artificial means using inorganic materials. Porous ceramic beads are inorganic non-metallic material spheres with a size ranging from 0.3 to 4 mm that are hollow or rich in pores. It has the advantages of light weight, low thermal conductivity, sound insulation, wear resistance, high dispersion, good electrical insulation and thermal stability, and low manufacturing cost. It is a new type of lightweight material with a wide range of uses, such as light weight, high strength and excellent performance. It is widely used in resin and other fillers, emulsion explosives, high-grade fireproo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/00C04B35/634
Inventor 席小庆杨金龙王亚利曹庆雷申殿军马宁
Owner TSINGHUA UNIV
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