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Low-temperature sintered microwave dielectric ceramic material, preparation method and microwave device

A technology of microwave dielectric ceramics and low-temperature sintering, applied in the field of microwave dielectric ceramics, can solve the problems of inability to obtain high-density ceramic diaphragms, increased loss, and reduced quality factor, and achieve low dielectric loss, low production costs, and quality The effect of high factor

Active Publication Date: 2015-04-15
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many deficiencies in the preparation of LTCC by the above-mentioned scheme, which is specifically shown in B 2 o 3 It is easily soluble in water, ethanol and other solvents, and has a gelation reaction with the most commonly used binders such as PVA and PVB, so that the ceramic powder cannot obtain high-density ceramic diaphragms after casting
Chinese patent application 201210478550 discloses the use of CuO and B 2 o 3 The pre-fired mixture lowers the sintering temperature and achieves better results, but due to the presence of copper in this material, the loss increases and the quality factor decreases

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  • Low-temperature sintered microwave dielectric ceramic material, preparation method and microwave device
  • Low-temperature sintered microwave dielectric ceramic material, preparation method and microwave device

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preparation example Construction

[0031] The invention also discloses a method for preparing a low-temperature sintered microwave dielectric ceramic material, which includes the following steps:

[0032] a. Preparation (Ba (1-a) Sr a ) 5 (Nb (1-b) Sb b ) 4 o 15 ceramic powder;

[0033] b. Preparation of BaNb 2 o 6 ceramic powder;

[0034] c. preparing zinc boron glass powder;

[0035] d. Weighing (Ba (1-a) Sr a ) 5 (Nb (1-b) Sb b ) 4 o 15 Ceramic powder, BaNb 2 o 6 Ceramic powder and zinc-boron glass form a mixed powder.

[0036] Further, in step a, press (Ba (1-a) Sr a ) 5 (Nb (1-b) Sb b ) 4 o 15 The stoichiometric ratio weighs barium-containing compounds, strontium-containing compounds, niobium-containing compounds, and antimony-containing compounds and puts them into a ball mill jar and uses wet ball milling to mix ball mills. After drying in an oven, keep it at 900°C to 1200°C for 1 to 6 hours to obtain (Ba (1-a) Sr a ) 5 (Nb (1-b) Sb b ) 4 o 15 ceramic powder;

[0037] I...

Embodiment 1

[0053] Examples 1 to 5 (Example 1 is an unmodified comparative example) show that positive 2-valent strontium elements and positive 5-valent antimony elements with small radius are used to synergistically dope Ba 5 Nb 4 o 15 , can effectively adjust the microwave dielectric properties of the material. Especially the microwave property of the material of embodiment 3 is better, and dielectric constant ε r =37.1, the quality factor Q×f can reach 42600GHz, and the resonant frequency temperature coefficient τ f =51ppm / °C.

[0054] Embodiment six to embodiment eight show that BaNb 2 o 6 Ceramics can significantly adjust the resonant frequency temperature coefficient of the material, making the material suitable for applications where the temperature varies. Especially when BaNb 2 o 6 When the ceramic content is 0.1mol, i.e. embodiment 7, the resonant frequency temperature coefficient τ f =3ppm / °C.

Embodiment 14

[0056] In Example 14, the low-temperature co-fired microwave dielectric material with the most excellent comprehensive properties was obtained. That is, when a=0.02, b=0.05, x=0.1, z=5wt%, the dielectric constant ε r =35.5, the quality factor Q×f can reach 33600GHz, and the resonant frequency temperature coefficient τ f =1ppm / °C.

[0057] According to the parameter comparison of the above embodiments, the microwave dielectric material of the present invention has the advantages of moderate dielectric constant, high quality factor, and adjustable temperature coefficient of resonance frequency. Embodiments 3, 7 and 9 to 14 all obtain better microwave dielectric materials, especially Embodiment 14 has the best overall performance, quality factor Q×f>30000GHz, and resonant frequency temperature coefficient τ f Nearly zero, other embodiments are slightly insufficient compared with the fourteenth embodiment, but still meet the implementation process and requirements of the present...

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Abstract

The invention discloses a low-temperature sintered microwave dielectric ceramic material, a preparation method and a microwave device. The material comprises (Ba (1-a)Sra)5 (Nb (1-b) Sbb) 4O15 and zinc borosilicate glass, wherein a is not larger than 0.05 and b is not larger than 0.1. The material disclosed by the invention overcomes the problem in the prior art that a copper element is introduced to increase the dielectric loss, the material is insoluble in such solvents as water, ethanol and the like, generates no gelation reaction with such adhesives as PVA (Polyvinyl Alcohol), PVB (Polyvinyl Butyral) and the like and meets the LTCC (Low Temperature Co-Fired Ceramic) process requirements, and the material disclosed by the invention is high in quality factor, adjustable in frequency resonance temperature coefficient, capable of being prepared to a microwave device with a multilayer or single-layer dielectric layer structure and is more suitable for application in the field of high-frequency and high-temperature microwave communication; the related raw materials are wide in source, low in cost, simple in process, low in production cost and suitable for industrial production of microwave dielectric ceramic devices; and the microwave dielectric material is low in dielectric loss, high in quality factor, adjustable in frequency resonance temperature coefficient and capable of meeting the requirements of the application field of high frequency, variable temperature and high reliability.

Description

technical field [0001] The invention relates to the technical field of microwave dielectric ceramics for microwave components such as dielectric resonators and oscillators for microwave communication, and in particular to a low-temperature sintered microwave dielectric ceramic material, a preparation method and a microwave device. Background technique [0002] With the urgent demand of modern communication technology for miniaturization, integration, modularization and low-cost components, low temperature co-fired ceramics (Low Temperature Co-fired Ceramics) with excellent electrical, mechanical, thermal properties and high reliability , LTCC) technology has become a common technology of choice for the manufacture of communication components. The biggest feature of LTCC technology is that it uses metal (such as Ag) as the multilayer wiring conductor material to improve signal transmission rate and reliability, and it can sinter multiple microwave electronic components embedd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 杨晓战雒文博李在映刘明龙江林
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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