Preparation method for aluminium oxide porous ceramic

A technology of porous ceramics and alumina, applied in the field of alumina porous ceramics, can solve the problems of high protein cost, difficult to control the curing molding process, low adsorption energy and the like

Inactive Publication Date: 2014-07-09
ZHENGZHOU UNIV
View PDF7 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low adsorption energy of long-chain polymer proteins at the gas-liquid interface, using them as surfactants to stabilize bubbles cannot ac

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 0.819g of n-propyl gallate (PG) and pour it into 23g of deionized water, heat it in a water bath for 10 minutes, adjust the pH of the solution to 9 with ammonia water, and take 23.04g of Al 2 o 3 The powder was added into n-propyl gallate (PG) solution, and mechanically stirred at a speed of 200r / min for 10 minutes to obtain the first part of slurry. Take 3.07g of industrial gelatin and pour it into 40g of deionized water, heat in a water bath for 15 minutes and manually stir for 5 minutes to fully dissolve the industrial gelatin, then take 5.12g of yellow dextrin and add it to the industrial gelatin solution, and manually stir for 5 minutes to fully dissolve the industrial gelatin mix. Take 74.24gAl 2 o 3 The powder and 5.12g of silica fume powder were evenly mixed, then poured into the mixed solution of industrial gelatin and yellow dextrin, and mechanically stirred at a speed of 200r / min for 10 minutes to obtain the second part of slurry. Finally, the first ...

Embodiment 2

[0023] Take 1.024g of n-propyl gallate (PG) and pour it into 33g of deionized water, heat it in a water bath for 10 minutes, adjust the pH of the solution to 9.4 with ammonia water, and take 23.04g of Al 2 o 3 The powder was added into n-propyl gallate (PG) solution, and mechanically stirred at a speed of 200r / min for 10 minutes to obtain the first part of slurry. Take 2.56g of industrial gelatin and pour it into 40g of deionized water, heat in a water bath for 15 minutes and manually stir for 5 minutes to fully dissolve the industrial gelatin, then take 5.12g of white dextrin and add it to the industrial gelatin solution, and manually stir for 5 minutes to fully dissolve the industrial gelatin mix. Take 69.12gAl 2 o 3 The powder and 10.24g of silica fume powder were evenly mixed, then poured into the mixed solution of industrial gelatin and white dextrin, and mechanically stirred at a speed of 200r / min for 10 minutes to obtain the second part of slurry. Finally, the first...

Embodiment 3

[0025] Take 1.229g of n-propyl gallate (PG) and pour it into 33g of deionized water, heat it in a water bath for 10 minutes, adjust the pH of the solution to 9.5 with ammonia water, and take 23.04g of Al 2 o 3 The powder was added into n-propyl gallate (PG) solution, and mechanically stirred at a speed of 200r / min for 10 minutes to obtain the first part of slurry. Take 3.58g of industrial gelatin and pour it into 40g of deionized water, heat in a water bath for 15 minutes and manually stir for 5 minutes to fully dissolve the industrial gelatin, then take 4.1g of cyclodextrin and add it to the industrial gelatin solution, and manually stir for 5 minutes to fully dissolve the industrial gelatin mix. Take 64gAl 2 o 3The powder and 15.36g of silica fume powder were evenly mixed, then poured into the mixed solution of industrial gelatin and cyclodextrin, and mechanically stirred at a speed of 200r / min for 10 minutes to obtain the second part of slurry. Finally, the first part o...

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
Densityaaaaaaaaaa
Compressive strengthaaaaaaaaaa
Densityaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method for aluminium oxide porous ceramic. Freeze drying and direct foaming are combined, a surfactant is utilized for modifying particle surfaces and further for enabling particles to have partial hydrophobicity, and particles with the partial hydrophobicity are utilized for stabilizing foams, so that the porous ceramic with high mechanical strength and relatively more closed pores is obtained. According to the preparation method, propyl gallate is utilized for modifying aluminium oxide particles and further for enabling aluminium oxide particles to have partial hydrophobicity, because solid particles with partial hydrophobicity has extremely high adsorption energy at a gas-liquid interface, the aluminium oxide particles are absorbed at a gas-liquid interface in an almost irreversible form, thus a low-energy-state gas-solid interface replaces the high-energy-state gas-liquid interface, and therefore the interfacial energy is reduced, the foam stability is substantially improved, the foam collapse time is prolonged, the pore structure in a dried blank body is guaranteed to be complete, and also the clear dimension of a sample is guaranteed to be unchanged by utilizing the freeze drying process for drying. The prepared aluminium oxide porous ceramic has the density of 0.35-0.65 g/cm<3>, the porosity of 75-90% and the compressive strength of 1.5-16 MPa.

Description

technical field [0001] The invention belongs to the field of alumina porous ceramics, and in particular relates to a process of combining freeze drying and direct foaming to prepare porous ceramics with high mechanical strength and multiple closed pores. Background technique [0002] Porous ceramics are ceramic materials that have been fired at high temperature and have a large number of interconnected or closed pores in the body. They have the advantages of low density, high porosity, high temperature resistance, corrosion resistance and good heat insulation performance. According to different pore-forming methods and pore structures, porous ceramics can be divided into three categories: granular ceramic sintered bodies, foamed ceramics and honeycomb ceramics. According to different pore sizes, it can be divided into macroporous, mesoporous and microporous ceramics. Porous alumina ceramic materials have good chemical stability, high temperature resistance, corrosion resist...

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
IPC IPC(8): C04B35/10C04B38/02C04B35/622
Inventor 杨道媛屈源超刘若洋冯晓聪
Owner ZHENGZHOU UNIV
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap