Homogenized alumina ceramic and preparation method thereof

A technology of alumina ceramics and alumina ceramic powder, which is applied in the field of homogenized alumina ceramics and its preparation, can solve the problems of inability to obtain homogenized alumina ceramics, achieve low cost, ensure mechanical properties, and be simple and easy line effect

Active Publication Date: 2020-01-17
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a homogenized alumina ceramic and it

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
  • Homogenized alumina ceramic and preparation method thereof
  • Homogenized alumina ceramic and preparation method thereof
  • Homogenized alumina ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] As mentioned above, the present invention provides a homogenized alumina ceramic and a preparation method thereof.

[0031] In the first aspect, according to an embodiment of the present invention, a method for preparing a homogenized alumina ceramic is provided. The method includes the following steps:

[0032] S1, prepare mixed slurry,

[0033] Mixing a certain mass ratio of silica sol, water-soluble organic matter and alumina ceramic powder in sequence to obtain a mixed slurry;

[0034] S2. Preparation of homogeneous alumina ceramics, including:

[0035] Injecting the mixed slurry into a mold and controlling the mold to be rapidly suspended in a liquid nitrogen environment, so that the mixed slurry is solidified and shaped to obtain a green body;

[0036] The green body is demolded and subjected to post-treatment to obtain homogeneous alumina ceramics.

[0037] In the above preparation method, the silica sol is used as the liquid phase for preparing the slurry, and alkaline sili...

Example Embodiment

[0061] Example 1

[0062] Step 1: Preparation of slurry, mixing polyvinylpyrrolidone, silica sol with a concentration of 15 wt%, pH 3.6, and alumina ceramic powder at a mass ratio of 1.1:43.9:55 and ball milling to obtain alumina ceramic slurry; wherein The alumina ceramic powder contains 10wt% of particles with an average particle diameter of 50nm and 90wt% of particles with 2μm, and the ball milling time is 28h.

[0063] Step 2: Preparation of homogenized alumina ceramics. The slurry is injected into the mold under vacuum degassing for 20 minutes, and quickly suspended in liquid nitrogen for 0.5 hours to fully solidify and then demolded to obtain a green body; the green body is dried at room temperature for 24 hours, 1500 Homogenized alumina ceramic materials can be prepared by sintering at ℃ for 2h.

Example Embodiment

[0064] Example 2

[0065] Step 1: Preparation of slurry, mixing polyvinylpyrrolidone, silica sol with a concentration of 15wt%, pH 3.6, and alumina ceramic powder in a mass ratio of 2.5:42.5:55 and ball milling to obtain alumina ceramic slurry; wherein The alumina ceramic powder contains 10wt% of particles with an average particle diameter of 50nm and 90wt% of particles with 2μm, and the ball milling time is 28h.

[0066] Step 2: Preparation of homogenized alumina ceramics. The slurry is injected into the mold under vacuum degassing for 20 minutes, and quickly suspended in liquid nitrogen for 0.5 hours to fully solidify and then demolded to obtain a green body; the green body is dried at room temperature for 24 hours, 1500 Homogenized alumina ceramic materials can be prepared by sintering at ℃ for 2h.

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
The average particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a homogenized alumina ceramic and a preparation method thereof. In the prior art, the homogenized alumina ceramic cannot be obtained by the existing preparation method. A purpose of the invention is to solve the technical problem in the prior art. The preparation method comprises: preparing a mixed slurry, wherein a silica sol, a water-soluble macromolecular organic matter and aluminum oxide ceramic powder are sequentially and uniformly mixed according to a certain mass ratio to obtain a mixed slurry; and preparing a homogenized alumina ceramic, wherein the obtained mixed slurry is injected into a mold, the mold is controlled to rapidly suspend in a liquid nitrogen environment to cure and mold the mixed slurry so as to obtain a billet, demolding the billet, and carrying out post-treatment to obtain the a homogenized alumina ceramic.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramics, in particular to a homogenized alumina ceramic and a preparation method thereof. Background technique [0002] Alumina ceramics have the advantages of high mechanical strength, high resistivity, good electrical insulation, high melting point, good corrosion resistance, excellent chemical stability, etc., and are widely used in machinery, electronic power, chemical industry, medicine, construction and other high-tech fields . [0003] At present, the preparation methods of alumina ceramics include: isostatic pressing molding, dry pressing molding, extrusion molding, tape casting, grouting molding, gel injection molding, freezing molding, freezing gelling molding, etc. Among them, the commonly used methods are extrusion molding, grouting molding, and freeze molding. The amount of solvent and binder in the extrusion molding slurry is relatively high, which makes the green...

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): C04B35/117C04B35/622C04B35/634C04B35/636B28B1/00
CPCC04B35/117C04B35/622C04B35/63444C04B35/6365B28B1/007C04B2235/3418C04B2235/5454C04B2235/5445C04B2235/5436C04B2235/656C04B2235/6567
Inventor 董衡孙志强韩耀肖振兴王涛李淑琴吕毅张剑张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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