Temperature stable type magnesium antimonite lithium base medium microwave composite ceramic and its preparation method

A lithium magnesium antimonate-based, temperature-stable technology, which is applied in the field of electronic ceramics and its manufacturing, can solve the problems of ceramic sintering cracking, large temperature coefficient of resonant frequency, etc., and achieves the effects of low cost, abundant sources, and improved temperature stability.

Active Publication Date: 2017-10-10
XIAN UNIV OF POSTS & TELECOMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome Li in the prior art 3 Mg 2 SbO 6 The shortcomings of ceramic sintering cracking and large temperature coefficient of resonance frequency provide a low-cost, high-performance temperature-stable magnesium-lithium antimonate-based microwave dielectric composite ceramic, and provide a preparation method for it

Method used

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  • Temperature stable type magnesium antimonite lithium base medium microwave composite ceramic and its preparation method
  • Temperature stable type magnesium antimonite lithium base medium microwave composite ceramic and its preparation method
  • Temperature stable type magnesium antimonite lithium base medium microwave composite ceramic and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] 1. Preparation of Li 3 Mg 2 SbO 6 Burnt powder

[0023] Press Li 3 Mg 2 SbO 6 The stoichiometric ratio of the raw material MgO 2.391g, Li 2 CO 3 3.354g, Sb 2 o 3 4.366g, put into a nylon ball mill jar, add 20g of agate balls and 20g of absolute ethanol, mix and mill with a planetary ball mill for 8 hours at a speed of 360 rpm, and dry in an oven at 80-100°C for 4 hours after ball milling , and then placed in a corundum crucible and pre-fired at 950°C for 4 hours to prepare Li 3 Mg 2 SbO 6 Burnt powder.

[0024] 2. Preparation of Ba 3 (VO 4 ) 2 Burnt powder

[0025] Press Ba 3 (VO 4 ) 2 The stoichiometric ratio of the raw material BaCO was weighed 3 7.650g, V 2 o 5 2. 350g, put it into a nylon ball mill jar, add 20g of agate balls and 20g of absolute ethanol, mix and mill with a planetary ball mill for 8 hours at a speed of 360 rpm, and dry in an oven at 80-100°C for 4 hours after ball milling , and then placed in a corundum crucible and pre-fir...

Embodiment 2

[0029] In step 3 of the present embodiment, press 0.95Li 3 Mg 2 SbO 6 -0.05Ba 3 (VO 4 ) 2 The stoichiometric ratio of Li 3 Mg 2 SbO 6 Calcined powder 8.948g, Ba 3 (VO 4 ) 2 Calcined powder 1.052g, and other steps are the same as in Example 1, to prepare a temperature-stable magnesium antimonate lithium-based microwave dielectric composite ceramic.

Embodiment 3

[0031] In step 3 of the present embodiment, press 0.85Li 3 Mg 2 SbO 6 -0.15Ba 3 (VO 4 ) 2 The stoichiometric ratio of Li 3 Mg 2 SbO 6 Calcined powder 7.171g, Ba 3 (VO 4 ) 2 Put 2.829g of pre-burnt powder into a nylon ball mill jar, add 20g of agate balls and 20g of absolute ethanol, mix and mill with a planetary ball mill for 8 hours at a speed of 360 rpm, and place in an oven at 80-100°C after ball milling Dry for 4 hours, then add 0.5g of polyvinyl alcohol aqueous solution with a mass fraction of 5% for granulation, pass through a 120 mesh sieve, and press it into a cylindrical green body with a diameter of 10mm and a thickness of 5mm with a powder tablet press under a pressure of 4MPa , the cylindrical green body was sintered at 1100 °C for 5 hours. The other steps are the same as in Example 1, and a temperature-stable magnesium-lithium antimonate-based microwave dielectric composite ceramic is prepared.

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Abstract

The invention discloses a temperature stable type magnesium antimonite lithium base medium microwave composite ceramic and its preparation method. A phase of a composite ceramic comprises Li3Mg2SbO6 phase in a rock salt structure, Ba3 (VO4)2 phase in an orthorhombic structure and a BaSb2O6 in a trilateral structure, wherein Li3Mg2SbO6 content is 54wt%-78wt%, Ba3 (VO4)2 content is 13wt%-38wt%, and the rest is BaSb2O6. Through adding Ba3 (VO4)2 presintering powder in the Li3Mg2SbO6 main powder body, the composite ceramic inhibits the rupturing of Li3Mg2SbO6, improves its temperature stability, and acquires a new material with good microwave dielectric property; the dielectric constant is 9.0-12.1, the quality factor is 18400-45100 GHz, and the resonate frequency temperature coefficient is -9.0 to +7.0 ppm / DEG C. The preparation method is rich in raw materials, simple in technique, and good for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramics and its manufacture, and in particular relates to a temperature-stable magnesium-lithium antimonate-based microwave dielectric composite ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used in microwave frequency (300MHz-300GHz) circuits as dielectric materials to complete one or more functions. Ideal microwave dielectric ceramics have a suitable dielectric constant ε r , high quality factor Q×f (good frequency selectivity) and resonant frequency temperature coefficient τ tending to zero f (high temperature stability). With the rapid development of the contemporary microwave communication and wireless communication industry, especially the operating frequency of microwave devices, which are key components of the communication system, continues to expand to the high-frequency end. For example, 4G has begu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/626
CPCC04B35/01C04B35/626C04B2235/3206C04B2235/3239C04B2235/3294C04B2235/442C04B2235/96
Inventor 姚国光裴翠锦任兆玉刘娜巩译邢惠谕付龙玺梁佰成
Owner XIAN UNIV OF POSTS & TELECOMM
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