Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Preparation method of fully closed-cell porous mullite ceramics based on direct solidification injection molding

A porous mullite, injection molding technology, applied in the direction of ceramic products, ceramic material production, clay products, etc., can solve the problems of difficulty in obtaining porous ceramics with a fully closed-cell structure, long preparation period, etc., to ensure excellent performance, Low cost of raw materials and simple operation

Active Publication Date: 2022-07-19
ANHUI JINYAN GAOLING SCI & TECH CO LTD +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Porous ceramics that add hollow spheres as pore-forming agents are usually prepared by gel injection molding. This process requires debinding after molding. The preparation cycle is long, and there are interconnected pores between the hollow spheres. It is difficult to obtain Porous ceramics with fully closed cell structure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of fully closed-cell porous mullite ceramics based on direct solidification injection molding

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] like figure 1 As shown, the present invention provides a method for preparing a fully closed-cell porous mullite ceramic based on direct solidification injection molding, the method comprising the following steps:

[0027] S1 Mix kaolin powder, fly ash hollow spheres, deionized water and rheological additives, and use high-speed shearing or mechanical stirring to prepare uniformly dispersed ceramic slurry;

[0028] S2 Add a curing agent to the ceramic slurry and mix it evenly, and then degas it by vacuum degassing or centrifugal degassing to obtain a mixed slurry;

[0029] S3, inject the mixed slurry into the mold, and then heat it for 0.5h-2h in a water bath at 50°C to 90°C to solidify, and obtain a ceramic green body after demoulding;

[0030] S4: Dry the ceramic green body at a temperature of 50℃~90℃ for 12h~24h, and finally put the dried ceramic green body in a sintering furnace, and sinter it at a high temperature of 1350℃~1600℃ for 1h~2h, so as to The fully clos...

Embodiment 1

[0037] S1 Mix 45g of coal-based kaolin powder, 15g of fly ash hollow spheres and 40g of deionized water, and use high-speed shearing to prepare a ceramic slurry with a solid content of 60wt%, wherein the particle size of the fly ash hollow spheres is is 90μm;

[0038] S2 is added with calcium iodate in the ceramic slurry at a ratio of 8g / L and mixed evenly, and then degassed by vacuum degassing to obtain a mixed slurry;

[0039] S3, inject the mixed slurry into the silica gel mold, keep the mixture in a water bath at 70°C for 1 h to solidify the mixed slurry, and obtain a ceramic china after demoulding;

[0040]In S4, the ceramic green body was dried at 90 °C for 12 h, and sintered at 1550 °C for 1 h to obtain fully closed-cell porous mullite ceramics.

Embodiment 2

[0042] S1 Mix 20g of coal-based kaolin powder, 50g of fly ash hollow spheres, 30g of deionized water and 0.3g of cellulose, and use mechanical stirring to prepare a ceramic slurry with a solid content of 70% by weight, wherein the fly ash is hollow The particle size of the ball is 20 μm;

[0043] S2 is added with barium iodate in the ceramic slurry at a ratio of 6g / L and mixed evenly, and then degassed by vacuum degassing to obtain a mixed slurry;

[0044] S3: inject the mixed slurry into the silica gel mold, heat the mixed slurry for 0.5h in a water bath at 90°C to solidify the mixed slurry, and obtain a ceramic china after demoulding;

[0045] S4 The ceramic green body was dried at 65 °C for 20 h, and sintered at 1350 °C for 2 h to obtain fully closed-cell porous mullite ceramics.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of inorganic non-metallic ceramics, and specifically discloses a preparation method of fully closed-cell porous mullite ceramics based on direct solidification injection molding. The method includes the following steps: mixing kaolin powder, fly ash hollow spheres, deionized water and a rheological aid to obtain a uniformly dispersed ceramic slurry; adding a curing agent to the ceramic slurry and mixing uniformly, and then performing degassing treatment to obtain a mixed slurry; injecting the mixed slurry into a mold and heating for a preset time to solidify, and demoulding to obtain a ceramic green body; sintering the dried ceramic green body at a high temperature to obtain Fully closed-cell porous mullite ceramics. In the present invention, the kaolin powder is used to stabilize the slurry, and at the same time, the kaolin powder fills the gaps between the hollow spheres, so that porous ceramics with a fully closed-cell structure can be obtained. It has the advantages of simple operation, energy saving and environmental protection, low equipment requirements and short preparation process.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic ceramics, and more particularly relates to a method for preparing a fully closed-cell porous mullite ceramic based on direct solidification injection molding. Background technique [0002] Porous ceramics can be divided into open-pore type and closed-pore type according to the type of pores. Among them, closed-cell ceramics are ceramics with a closed pore structure, and the internal pores are not connected to the outside world or have poor connectivity. Due to its closed-cell structure, closed-cell ceramics have greater advantages than open-cell ceramics in terms of thermal insulation, water resistance, and corrosion resistance. [0003] The preparation of traditional porous ceramics often uses the foaming method and the pore-forming agent method. By introducing gas, liquid or solid as the pore-forming medium, the pore-forming medium is removed during the high-temperature sintering process, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/08C04B33/13C04B33/135C04B33/28
CPCC04B33/1352C04B38/08C04B33/131C04B33/1305C04B33/28C04B2235/444C04B2235/449C04B38/0061Y02P40/60
Inventor 吴甲民陈双史玉升李晨辉闫春泽张矿王永均张红星
Owner ANHUI JINYAN GAOLING SCI & TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com