Low temperature sintering lithium-base microwave dielectric ceramic material and preparation thereof

A technology of microwave dielectric ceramics and low-temperature sintering, applied in the field of electronic ceramics and its preparation, to achieve the effects of simple chemical composition and preparation process, low sintering temperature, and good microwave performance

Inactive Publication Date: 2009-02-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microwave dielectric resonators made of high dielectric constant microwave materials can greatly reduc...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Raw material Li will be analyzed for purity 2 CO 3 and Nb 2 o 5 According to the formula Li 3 MO 4 +x wt.% B 2 o 3 , where M=Nb 5+ , where x=0. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, and pre-fire at 800°C for 4 hours, then pulverize the pre-fired block samples and then perform secondary ball milling for 5 hours, grind and bake After drying, granulate and sieve through double-layer sieves of 60 mesh and 120 mesh to obtain the required ceramic material. The ceramic material is pressed into shape (sheet or column) as required, and then sintered in air at 930°C for 2 to 3 hours to form porcelain, and the low-temperature sintered lithium-based microwave dielectric ceramic material can be obtained.

[0026] The performance of this group of ceramic materials reaches the following indicators:

[0027] Sintered into porcelain at 930°C in air, dielectric properties ε under microwave r ~15.8 (8.99GHz), quality factor Q~6200, Q...

Embodiment 2

[0029] Raw material Li will be analyzed for purity 2 CO 3 , Ta 2 o 5 and B 2 o 3 According to the formula Li 3 MO 4 +x wt.% B 2 o 3 , where M=Ta 5+ , where x=0.6. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, and pre-fire at 750°C for 4 hours, then pulverize the pre-fired block samples and then perform secondary ball milling for 5 hours, grind and bake After drying, granulate and sieve through double-layer sieves of 60 mesh and 120 mesh to obtain the required porcelain material. The ceramic material is pressed into shape (sheet or column) as required, and then sintered in air at 930°C for 2 to 3 hours to form porcelain, and the ultra-low temperature sintered lithium-based microwave dielectric ceramic material can be obtained.

[0030] The performance of this group of ceramic materials reaches the following indicators:

[0031] Sintered into porcelain at 930°C in air, dielectric properties ε under microwave r ~14.1 (12.4GHz), q...

Embodiment 3

[0033] Raw material Li will be analyzed for purity 2 CO 3 , Sb 2 o 5 and B 2 o 3 According to the formula Li 3 MO 4 +x wt.% B 2 o 3 , where M=Sb 5+ , where x=0.6. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, and pre-fire at 750°C for 4 hours, then pulverize the pre-fired block samples and then perform secondary ball milling for 5 hours, grind and bake After drying, granulate and sieve through double-layer sieves of 60 mesh and 120 mesh to obtain the required porcelain material. The ceramic material is pressed into shape (sheet or column) as required, and then sintered in air at 930°C for 2 to 3 hours to form porcelain, and the ultra-low temperature sintered lithium-based microwave dielectric ceramic material can be obtained.

[0034] The performance of this group of ceramic materials reaches the following indicators:

[0035] Sintered into porcelain at 930°C in air, dielectric properties ε under microwave r ~10.29 (13.46GHz),...

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Abstract

The invention discloses a lithium-based low-temperature sintering microwave dielectric ceramic material and a preparation thereof. A series of microwave dielectric materials which have great microwave dielectric properties, the dielectric constant of 7.7 to 16, the quality factor Qf of 13,366GHz to 55,009GHz, the resonance frequency temperature coefficient of minus 24.2ppm/DEG C to minus 55ppm/DEG C and can be sintered to ceramics under the lower temperature are obtained by starting from a phase diagram of a Li2O-M2O5 (M is equal to Nb<5+>, Ta<5+> or Sb<5+>) binary system, being based on a single-phase compound Li3MO4 of which and adding B2O3 to reduce the sintering temperature. The expression formula of the low-temperature sintering microwave dielectric ceramic structure is: Li3MO4 plus x percent by weight of B2O3, wherein, M is equal to Nb<5+>, Ta<5+> or Sb<5+>, x is not less than 0 and not more than 1.0.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, in particular to a lithium-based low-temperature sintered microwave dielectric ceramic material sintered at low temperature and its preparation. Background technique [0002] With the development of wireless communication, portability requirements are put forward for communication equipment systems, from microwave components to complete machine systems towards integration, in order to obtain products with small size, light weight, high reliability and low cost. [0003] The requirement for miniaturization and integration of microwave components (bandpass, resonator, filter, etc.) has led to the rapid development of low-temperature co-fired ceramic (LTCC) technology. Low-temperature co-fired ceramic technology can provide high-density, high-frequency, high-digital packaging technology and good heat treatment process. The co-firing temperature of low-temperature co-fired cera...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/495C04B35/622
Inventor 汪宏周迪姚熹庞利霞吴新光
Owner XI AN JIAOTONG UNIV
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