Scheelite type molybdenum-based ultralow temperature-sintered microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and scheelite type, applied in the field of scheelite type molybdenum-based ultra-low temperature sintered microwave dielectric ceramic materials and its preparation, can solve the problems of deteriorating microwave dielectric properties of materials, and achieve simple chemical composition and preparation process , Good microwave performance and low dielectric loss

Inactive Publication Date: 2012-11-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the addition of inappropriate sintering aids is easy to introduce heterogeneous substances, which deteriorates the microwave dielectric properties of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw material MoO will be analyzed for purity 3 , Li 2 CO 3 , CaCO 3 and Bi 2 o 3 According to the formula (Li 0.005 Ca 0.99 Bi 0.005 ) MoO 4 preparation. 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 950°C-1050°C for 2-3 hours to form porcelain, and then the scheelite-type molybdenum-based microwave dielectric ceramic material can be obtained.

[0025] The performance of this group of ceramic materials reaches the following indicators:

[0026] Sintered into porcelain in air at 950℃~1050℃, the dielectric property ε under microwave r =10.8 (12GHz), quali...

Embodiment 2

[0028] Raw material MoO will be analyzed for purity 3 , Li 2 CO 3 , CaCO 3 and Bi 2 o 3 According to the formula (Li 0.05 Ca 0.9 Bi 0.05 ) MoO 4 preparation. 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 800°C to 850°C for 2 to 3 hours to form porcelain, and the scheelite-type molybdenum-based microwave dielectric ceramic material can be obtained.

[0029] The performance of this group of ceramic materials reaches the following indicators:

[0030] Sintered into porcelain at 800℃~850℃ in the air, dielectric properties ε under microwave r =12.7 (10.3GHz), qua...

Embodiment 3

[0032] Raw material MoO will be analyzed for purity 3 , Li 2 CO 3 , CaCO 3 and Bi 2 o 3 According to the formula (Li 0.075 Ca 0.85 Bi 0.075 ) MoO 4 preparation. After preparation, fully mix and ball mill for 4 hours, then dry, sieve, briquette, and pre-fire at 700°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 700°C to 760°C for 2 to 3 hours to form porcelain, and the scheelite-type molybdenum-based microwave dielectric ceramic material can be obtained.

[0033] The performance of this group of ceramic materials reaches the following indicators:

[0034] Sintered into porcelain at 700℃~760℃ in the air, dielectric properties ε under microwave r =14.7 (10GHz), qu...

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PUM

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Abstract

The invention discloses a scheelite type molybdenum-based ultralow temperature-sintered microwave dielectric ceramic material and a preparation method thereof. The structure expression of the ceramic material is (Li0.5-0.5MxBi0.5-0.5x)MoO4, wherein M is equal to Ca2+, Zn2+, Sr2+ or Ba2+, 0.0(x(1.0. The scheelite type molybdenum-based ultralow temperature-sintered microwave dielectric ceramic material has the characteristics of adjustable relative dielectric constant (10.8 to 44), low dielectric loss under low frequency (tan delta(5*10-4, 1 MHz), high microwave performance (Qf is equal to 3,200 GHz to 84,000 GHz), low sintering temperature (560 to 1,050 DEG C), adjustable temperature coefficient of resonance frequency (-55 to +250 ppm / DEG C) and simple chemical composition and preparation process.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its preparation, in particular to a scheelite-type molybdenum-based ultra-low temperature sintered microwave dielectric ceramic material sintered at low temperature and its preparation. Background technique [0002] Microwave dielectric ceramics are mainly used to make microwave components such as resonators, filters, dielectric antennas, and dielectric waveguide circuits, and can be used in mobile communications, satellite communications, and military radars. With the rapid development of science and technology, the rapid increase in the amount of communication information, and people's requirements for wireless communication, the use of microwave communication systems such as satellite communication and satellite live TV has become an inevitable trend in the development of current communication technology. With the continuous development of electronic information technology in the directio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 周迪汪宏姚熹张高群庞利霞吴新光郭靖
Owner XI AN JIAOTONG UNIV
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