Medium-dielectric-constant low-temperature sintering microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and low-temperature sintering, which is applied in the field of microwave dielectric ceramic materials, can solve problems such as high frequency temperature coefficient, influence of dielectric properties, and uneven dispersion of powder materials, and achieve reduced performance deterioration, high stability, and excellent preparation process simple effect

Active Publication Date: 2022-03-01
JIAXING GLEAD ELECTRONICS CO LTD
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  • Application Information

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Problems solved by technology

However, if oxides such as B2O3 are used alone for cooling, since they are easily soluble in water, ethanol and other solvents, their content will be lost during the filtration and drying process. It will affect the dielectric properties; in the casting process, it is also easy to cross-link with PVA, PVB and other organic substances, resulting in uneven dispersion of powder in the film, resulting in some problems in later products
Huanfu Zhou et al pointed out in the article "Journal of Materials Research" that by adding BaCu(B2O5) (BCB) calcined powder, Ba5 sub>Nb4O15 The sintering temperature drops to 875℃, which can avoid the direct addition of B2O3 , leading to the risk of the above problems, but the frequency temperature coefficient of the material is high: around +60ppm / ℃ (Zhou H, Wang H, Zhang M, et al.Microwave dielectric properties and compatibility with silver of low-fired Ba5 Nb4O15 ceramics by BaCu(B2O5) addition[J].Journal of Materials Research,2010,25(9):1793-1798.)

Method used

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  • Medium-dielectric-constant low-temperature sintering microwave dielectric ceramic material and preparation method thereof
  • Medium-dielectric-constant low-temperature sintering microwave dielectric ceramic material and preparation method thereof
  • Medium-dielectric-constant low-temperature sintering microwave dielectric ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Press Ba 5 Nb 4 o 15 Stoichiometric proportion weighing raw material BaCO 3 , Nb 2 o 5 For mixing, absolute ethanol is used as a solvent, the mass ratio of the mixture to absolute ethanol is 1:1~3, the mixture is ball-milled for 17-45 hours and dried at 80°C, and the dried mixture is passed through a 40-mesh sieve into an alumina crucible and calcined at 950-1050°C for 1.5-3.5 hours to synthesize the main phase powder, which is ground and passed through a 40-mesh sieve as a ceramic base material for later use.

[0034] According to the chemical composition 0.28CaO·0.09Al 2 o 3 0.46B 2 o 3 0.16SiO2 2 Weigh the dried CaCO 3 、Al 2 o 3 、H 3 BO 3 and SiO 2 For mixing, choose ZrO 2 For ball milling, add absolute ethanol according to the mass ratio of the mixture and absolute ethanol at 1:1.5, use a wet method for 24 hours and then dry at 80°C. Pass the dried mixture through a 40-mesh screen and put it into a corundum crucible. After heat preservation at 1400°...

Embodiment 2

[0037] Press Ba 5 Nb 4 o 15 Stoichiometric proportion weighing raw material BaCO 3 , Nb 2 o 5 For mixing, absolute ethanol is used as a solvent, the mass ratio of the mixture to absolute ethanol is 1:1~3, the mixture is ball-milled for 17-45 hours and dried at 80°C, and the dried mixture is passed through a 40-mesh sieve into an alumina crucible and calcined at 950-1050°C for 1.5-3.5 hours to synthesize the main phase powder, which is ground and passed through a 40-mesh sieve as a ceramic base material for later use.

[0038] According to the chemical composition 0.28CaO·0.09Al 2 o 3 0.46B 2 o 3 0.16SiO2 2 Weigh the dried CaCO 3 、Al 2 o 3 、H 3 BO 3 and SiO 2 For mixing, choose ZrO 2 For ball milling, add absolute ethanol according to the mass ratio of mixture and absolute ethanol at 1:1.5, use wet mixing for 24 hours, then dry at 80°C, pass the dried mixture through a 40-mesh screen, and put it into a corundum crucible. After heat preservation at 1400°C for 2 ...

Embodiment 3

[0041] Press Ba 5 Nb 4 o 15 Stoichiometric proportion weighing raw material BaCO 3 , Nb 2 o 5 For mixing, absolute ethanol is used as a solvent, the mass ratio of the mixture to absolute ethanol is 1:1~3, the mixture is ball-milled for 17-45 hours and dried at 80°C, and the dried mixture is passed through a 40-mesh sieve into an alumina crucible and calcined at 950-1050°C for 1.5-3.5 hours to synthesize the main phase powder, which is ground and passed through a 40-mesh sieve as a ceramic base material for later use.

[0042] According to the chemical composition 0.28BaO·0.09Al 2 o 3 0.46B 2 o 3 0.16SiO2 2 Weigh the dried BaCO 3 、Al 2 o 3 、H 3 BO 3 and SiO 2 For mixing, choose ZrO 2 For ball milling, add absolute ethanol according to the mass ratio of the mixture and absolute ethanol at 1:1.5, use a wet method for 24 hours and then dry at 80°C. Pass the dried mixture through a 40-mesh screen and put it into a corundum crucible. After heat preservation at 1400°C ...

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Abstract

The invention relates to a medium-dielectric-constant low-temperature sintering microwave dielectric ceramic material which comprises a main-phase ceramic material Ba5-xNb4O15-x and a sintering aid A, and x is more than or equal to 0 and less than or equal to 1.5; the sintering aid A accounts for 1-15 wt% of the mass fraction of the Ba < 5-x > Nb < 4 > O < 15-x >; the sintering aid A is one or more of ZBS glass and CuO and a compound of aRO-bAl2O3-cB2O3-dSiO2, or the sintering aid A is only the compound of aRO-bAl2O3-cB2O3-dSiO2, and R is at least one of Ba or Ca. According to the medium-dielectric-constant low-temperature sintering microwave dielectric ceramic material provided by the invention, the risk of cross-linking reaction between the medium-dielectric-constant low-temperature sintering microwave dielectric ceramic material and organic matters such as PVA (Polyvinyl Alcohol) and PVB (Polyvinyl Butyral) in a tape casting process is reduced by The comprehensive frequency temperature coefficient of the material is adjusted through a non-stoichiometric ratio, so that the risk of performance deterioration and difficult cooling caused by addition of the second-phase ceramic material is reduced.

Description

technical field [0001] The invention belongs to the field of microwave dielectric ceramic materials, in particular to a medium dielectric constant low-temperature sintered microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] With the development of the economy, communication electronic products have gradually entered the public's field of vision. Mobile phones, computers, etc. Thanks to advanced microwave communication technology and circuit technology, microwave dielectric ceramic materials play an important role in these technologies. [0003] Low-temperature co-fired ceramics (Low-temperature co-firing ceramics, LTCC) technology has the characteristics of integration and miniaturization, and can realize embedded passive devices and high-density circuit interconnection, so it has attracted more and more attention from researchers. To achieve low-temperature co-firing, the first condition is that the sintering temperature is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/36C04B2235/3281C04B2235/96C04B2235/442Y02P40/60
Inventor 张彩霞李进石珊童建喜李爱华
Owner JIAXING GLEAD ELECTRONICS CO LTD
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