Method for preparing Ba1-xSrxTiO3-MgO ferroelectric ceramic blank

A technology of ba1-xsrxtio3-mgo and ferroelectric ceramics, which is applied in the field of preparing Ba1-xSrxTiO3-MgO ferroelectric ceramic body, which can solve the problems of low viscosity, difficult pulping, high viscosity, etc., to shorten the ball milling time and reduce the amount of production , to overcome the effect of oxygen inhibition

Inactive Publication Date: 2010-10-27
HUAZHONG UNIV OF SCI & TECH
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when deionized water is used as solvent, it is difficult to prepare BSTM slurry with high solid phase content and low viscosity. The reason is that because BSTM contains a large amount of MgO, MgO is more active and easier to react with water , so it is more difficult to make pulp with water as solvent
However, if the non-water-based gel injection molding process is used to prepare the BSTM ferroelectric ceramic body, since organic matter is used as a solvent, this will inevitably increase the manufacturing cost and easily cause pollution
At the same time, due to the high viscosity of organic solvents, it is difficult to prepare a slurry with high solid content and good fluidity

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] Example 1 Large size 30wt% Ba 0.2 Sr 0.8 TiO 3 -70wt% MgO ferroelectric ceramic green body molding

[0022] Weigh 4.5g of acrylamide organic monomer, 0.3g of methylene bisacrylamide cross-linking agent, then weigh 6ml of deionized water, 9ml of ethanol, and 15ml of ethylene glycol as solvents, put them into a beaker, stir well, and make The monomer and cross-linking agent were fully dissolved, and then 5.6ml of 18wt% ammonium polyacrylate aqueous solution dispersant was added to the solution, and concentrated ammonia water was added to adjust the pH value of the solution to about 9, and a premixed solution was prepared. Weigh again 100g 30wt% Ba 0.2 Sr 0.8 TiO 3 -70wt% MgO ceramic powder, put the premix liquid and ceramic powder into the ball mill jar together, add 350g balls at the same time, and discharge the material after ball milling in a planetary ball mill at 250r / min for 3 hours to obtain high solid content and low viscosity After vacuum degassing the slur...

Embodiment 2

[0023] Example 2 Large size 35wt% Ba 0.5 Sr 0.5 TiO 3 Forming of -65wt% MgO ferroelectric ceramic green body

[0024]Weigh 8g of acrylamide organic monomer, 0.8g of methylenebisacrylamide cross-linking agent, then weigh 10ml of deionized water, 10ml of ethanol, and 10ml of ethylene glycol as solvents, put them into a beaker, stir well, and make the single The body and the crosslinking agent were fully dissolved, and then 16.7ml of 18wt% ammonium polyacrylate aqueous solution dispersant was added to the solution, and concentrated ammonia water was added to adjust the pH value of the solution to about 10, and the premix was prepared. Weigh again 100g 35wt%Ba 0.5 Sr 0.5 TiO 3 -65wt% MgO ceramic powder, put the premix liquid and ceramic powder into the ball mill jar together, add 200g balls at the same time, and discharge the material after ball milling in a planetary ball mill at 350r / min for 1 hour to obtain high solid content and low viscosity After vacuum degassing the s...

Embodiment 3

[0025] Example 3 Large size 40wt% Ba 0.55 Sr 0.45 TiO 3 Forming of -60wt% MgO ferroelectric ceramic green body

[0026] Weigh 4g of acrylamide organic monomer, 0.1g of methylene bisacrylamide cross-linking agent, then weigh 6ml of deionized water and 24ml of ethylene glycol as solvent, put them into a beaker, stir well, and make the monomer and cross-linking agent The coupling agent is fully dissolved, and then 8.3ml of 18wt% ammonium polyacrylate aqueous solution dispersant is added to the solution, and concentrated ammonia water is added to adjust the pH value of the solution to about 9, and a premixed solution is prepared. Weigh again 100g40wt%Ba 0.55 Sr 0.45 TiO 3 -60wt% MgO ceramic powder, put the premix liquid and ceramic powder into the ball mill jar together, add 300g balls at the same time, and discharge the material after ball milling in a planetary ball mill at 200r / min for 2 hours to obtain high solid content and low viscosity After vacuum degassing the slurr...

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

No PUM Login to view more

Abstract

The invention discloses a method for preparing a Ba1-xSrxTiO3-MgO ferroelectric ceramic blank, and belongs to the field of inorganic nonmetallic materials. The method comprises the following steps of: preparing materials; preparing premix solution; mixing the materials and the premix solution and performing ball-milling; degassing and adding a catalyst into the mixture; adding initiator into the mixture; performing gel-casting; and demolding and drying. In the method, the Ba1-xSrxTiO3-MgO ferroelectric ceramic blank is prepared by adopting a semi-aqueous gel-casting process which uses deionized water and alcohol organic matters which are soluble with water as solvents, so that the problems that in the conventional dry press method, the ceramic blank with complex shapes and large sizes cannot be prepared, and particularly uniformity inside ceramic parts cannot be ensured are overcome. Meanwhile, the Ba1-xSrxTiO3-MgO ferroelectric ceramic blank prepared by the method has high strength and high plasticity, can be subjected to subsequent processing of machining, isostatic pressing and the like, contributes to preparing ceramics with complex shapes and high compactness, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a method for preparing Ba 1-x Sr x TiO 3 - A method for MgO (abbreviated as BSTM) ferroelectric ceramic body, wherein 0.2≤x≤0.8. Background technique [0002] Ferroelectric ceramic materials are currently a hot spot in the field of ceramic materials. Ferroelectric materials have the nonlinear characteristic that the relative permittivity changes with the applied electric field. This adjustable characteristic can be applied in microwave circuits. The equivalent permittivity of the circuit can be changed by the applied electric field, thereby controlling the wave velocity and wavelength of electromagnetic waves. In order to achieve the change of phase shift. At present, the use of BSTM ferroelectric materials to make devices such as phase shifters has received widespread attention at home and abroad. At the same time, it is well known that electronic material mo...

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 Applications(China)
IPC IPC(8): C04B35/468C04B35/47C04B35/622
Inventor 吴甲民吕文中汪小红雷文范桂芬
Owner HUAZHONG UNIV OF SCI & 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