Method for molding coaxial dielectric filter green body

A technology of dielectric filter and molding method, which is applied in the field of green body molding, can solve problems such as unstable performance, poor operability, and low flexibility, and achieve the effect of process optimization

Active Publication Date: 2014-02-05
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of low flexibility, poor operability, low efficiency, and unstable performance in the existing coaxial dielectric filter forming method, and propose a method for efficiently preparing a ceramic device body with a complex structure New Method for Efficient Materialization of Coaxial Filters

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  • Method for molding coaxial dielectric filter green body
  • Method for molding coaxial dielectric filter green body

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preparation example Construction

[0020] The present invention provides an effective preparation method for a ceramic device body with a complex structure, the preparation method comprising:

[0021] (1) Design the target component structure and size, consider the 20% to 30% shrinkage of the material after sintering and debinding, and convert the target component size into the green body size.

[0022] (2) Mix the prepared microwave dielectric ceramic powder (A) with a group of organic matter (B) by ball milling to prepare a slurry with high solid phase content and moderate viscosity, defoaming and casting to prepare a slurry with a thickness of 0.5 ~1.5mm ceramic base diaphragm;

[0023] Among them, the microwave dielectric ceramic powder A is required to meet the mechanical and electrical performance requirements of the device, and the BCZN system is preferred, that is, Ba(Co 1-x Zn x ) 1／3 Nb 2／3 o 3 System ceramics, where x=0.2~0.4, the powder is pretreated by ball milling, pre-calcination, and sievin...

Embodiment 1

[0050] Step 1: Design a 3rd-order SIR filter body model, the working frequency is 2.4GHz, the total length of the resonant cavity after conversion is 1=6mm, the length of the stepped hole is 1r1:1r2=3:1, the normal plane size of the resonance direction w=13mm, h=6mm , resonant hole r1=1.5mm, r2=1mm, coupling hole r3=1mm

[0051] Step 2: Prepare the slurry, the slurry contains Ba(Co 0.6 Zn 0.4 ) 1／3 Nb 2／3 o 3 System ceramic powder material 100g and additive 100g, wherein the additive consists of binder polyvinyl butyral 8g, plasticizer polyethylene glycol-4002.5ml and polyethylene glycol-20004.6g, dispersant triolein 8ml, solvent ethanol 16ml, methyl ethyl ketone 64ml, defoaming agent n-butanol 6ml ethylene glycol 7ml, additive octanol 0.5ml cyclohexanone 1ml, use QM-BP planetary ball mill for 2 ball mills, and add in the first ball mill Powder, solvent ethanol 12ml butanone 48ml and dispersant, add the remaining reagents in the second ball mill, vacuum degassing for 10 m...

Embodiment 2

[0065] Step 1: Design a 3rd-order SIR filter body model, the working frequency is 2.4GHz, the total length of the resonant cavity after conversion is 1=6mm, the length of the stepped hole is 1r1:1r2=3:1, the normal plane size of the resonance direction w=13mm, h=6mm , resonant hole r1=1.5mm, r2=1mm, coupling hole r3=1mm

[0066] Step 2: Prepare the slurry, the slurry contains Ba(Co 0.8 Zn 0.2 ) 1／3 Nb 2／3 o 3 System ceramic powder material 130g and additive 70g, binder polyvinyl butyral 2.8g, plasticizer polyethylene glycol-4000.4ml and polyethylene glycol-20002.5g, dispersant triolein 7ml , solvent ethanol 9ml and methyl ethyl ketone 53ml, defoaming agent n-butanol 4.5ml ethylene glycol 3.5ml, additive octanol 0.8ml cyclohexanone 0.8ml, use QM-BP planetary ball mill for 2 ball mills, the first time Add powder, solvent ethanol 20ml, butanone 30ml and dispersant to the ball mill, add the remaining reagents to the second ball mill, vacuum defoam for 18 minutes, pour the slu...

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Abstract

The invention discloses a method for molding a coaxial dielectric filter green body. The method comprises the following steps: preparing a ceramic-based diaphragm, and cutting; disassembling the device structure into a group of plane figures from the vertical plane of a laminating direction according to the thickness of the diaphragm, and performing pattern transfer on the cut diaphragm; laminating the pattern transferred diaphragm in sequence until the total thickness of the diaphragm reaches a set device thickness, and heating and pressurizing the layered diaphragms to form a molded ceramic blank; degreasing and sintering the molded ceramic blank body to obtain the required ceramic device green body. According to the process, the problem that a complex ceramic device is hard to mold and limited in application can be solved, the thought of integral molding assisted by later process, which is followed by a traditional method is bypassed, the problems of low yield, poor operability, low flexibility, high broken rate of filter green bodies, offset out of control of a coupling structure, reduced bandpass filtering capability and the like are solved, and preparation of the ceramic device green body with complicated structure can be effectively realized.

Description

technical field [0001] The invention relates to the field of microwave dielectric ceramic element production, more specifically, to a method for forming a blank of a uniform impedance resonator (UIR) or stepped impedance resonator (SIR) coaxial dielectric filter with a complex structure . Background technique [0002] Microwave dielectric ceramic materials have high dielectric constant, low loss, and small temperature coefficient. They are currently widely used as electronic components such as resonators, filters, and duplexers in mobile communication equipment. Such materials are made into the above components When , the Q value of the device can be greatly improved, and it has better operating frequency selectivity and bandwidth, insertion loss, out-of-band attenuation and other indicators. With the rapid development of today's wireless communication technology, it has entered the era of the third generation or even the fourth generation of mobile communication. The appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/632
Inventor 吕文中罗希范桂芬
Owner HUAZHONG UNIV OF SCI & TECH
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