a ca 5 mg 4-x co x (vo 4 ) 6 Low-temperature sintered microwave ceramic material and its preparation method

A microwave ceramic and low-temperature sintering technology, applied in the field of functional ceramics, can solve the problem of high sintering temperature, achieve the effects of simple preparation process, stable phase formation, and simplified industrial production process

Active Publication Date: 2021-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a Ca 5 Mg 4-x co x (VO 4 ) 6 The low-temperature sintered microwave ceramic material and its preparation method are used to solve the problem that the sintering temperature of microwave ceramic materials is generally too high, and replace Mg ions with a certain amount of Co ions, which share the B site with Mg ions, improving the atomic packing rate of the material , improved the degree of cationic order, and obtained a significant performance improvement

Method used

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  • a ca <sub>5</sub> mg <sub>4-x</sub> co <sub>x</sub> (vo <sub>4</sub> ) <sub>6</sub> Low-temperature sintered microwave ceramic material and its preparation method
  • a ca <sub>5</sub> mg <sub>4-x</sub> co <sub>x</sub> (vo <sub>4</sub> ) <sub>6</sub> Low-temperature sintered microwave ceramic material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0026] According to the microwave ceramic material Ca 5 Mg 4-x co x (VO 4 ) 6 (x=0.5) stoichiometric ratio, weigh CaCO 3 , Mg(OH) 2 , CoO, V 2 o 5 A total of 30g, together with 30g of deionized water and 150g of zirconium balls, was placed in a ball milling tank for 7 hours; the slurry obtained from the ball milling was placed in an oven at a temperature of 100°C for drying, then ground and sieved; the obtained uniformly dispersed powder The body is placed in a sintering furnace and pre-sintered at 700°C for 3 hours; the obtained pre-sintered material is ball-milled again for 7 hours, then dried and granulated. The binder used is a polyvinyl alcohol solution with a mass concentration of 5%, and dried The green body was obtained after pressing; the green body was sintered at 800°C for 7 hours to prepare a low-temperature sintered microwave ceramic material, and its microwave dielectric properties were tested as follows: ε r =9.73, Q×f=47751GHz, τ f = -55.9 ppm / °C.

Embodiment 2

[0028] According to the microwave ceramic material Ca 5 Mg 4-x co x (VO 4 ) 6 (x=1) stoichiometric ratio, weigh CaCO 3 , Mg(OH) 2 , CoO, V 2 o 5 A total of 30g, together with 30g of deionized water and 150g of zirconium balls, was placed in a ball milling tank for 7 hours; the slurry obtained from the ball milling was placed in an oven at a temperature of 100°C for drying, then ground and sieved; the obtained uniformly dispersed powder The body is placed in a sintering furnace and pre-sintered at 700°C for 3 hours; the obtained pre-sintered material is ball-milled again for 7 hours, then dried and granulated. The binder used is a polyvinyl alcohol solution with a mass concentration of 5%, and dried The green body was obtained after pressing; the green body was sintered at 800°C for 7 hours to prepare a low-temperature sintered microwave ceramic material, and its microwave dielectric properties were tested as follows: ε r =9.65, Q×f=54685GHz, τ f = -55.3 ppm / °C.

Embodiment 3

[0030] According to the microwave ceramic material Ca 5 Mg 4-x co x (VO 4 ) 6 (x=1.5) stoichiometric ratio, weigh CaCO 3 , Mg(OH) 2 , CoO, V 2o 5 A total of 30g, together with 30g of deionized water and 150g of zirconium balls, was placed in a ball milling tank for 7 hours; the slurry obtained from the ball milling was placed in an oven at a temperature of 100°C for drying, then ground and sieved; the obtained uniformly dispersed powder The body is placed in a sintering furnace and pre-sintered at 700°C for 3 hours; the obtained pre-sintered material is ball-milled again for 7 hours, then dried and granulated. The binder used is a polyvinyl alcohol solution with a mass concentration of 5%, and dried The green body was obtained after compression molding; the green body was sintered at 775°C for 7 hours to prepare a low-temperature sintered microwave ceramic material, and its microwave dielectric properties were tested as follows: ε r =10.05, Q×f=47534GHz, τ f = -55.9 p...

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Abstract

The present invention is a functional ceramic field, which provides a CA specifically 5 MG 4‑x CO x (VO 4 Cure 6 Low -temperature sintering microwave ceramic materials and preparation methods; chemical formulas of microwave ceramic materials described by the present invention are CA 5 MG 4‑x CO x (VO 4 Cure 6 , Among them, 0 <x ≤ 2, the main crystal phase is CA 5 MG 4 (VO 4 Cure 6 , Can sinter at 775 ℃ ~ 800 ℃.The present invention effectively solves the problem of generally high sintering temperature of microwave ceramic materials, and replaces MG ions through a certain amount of CO ions through a certain amount of CO ions, which has a B position with MG ions.Improving the microwave macroelectoe dielectric performance of the microwave ceramic material, and especially improved the Q × F value of the material, especially when x = 1, the following performance is obtained: ε r = 9.65, Q × F = 54685GHz, τ f = 355.3ppm / ℃. At the same time, the preparation method of the present invention is simple, the cost of raw materials is low, and it has high practical application value.

Description

technical field [0001] The invention belongs to the field of functional ceramics, in particular to a Ca 5 Mg 4-x co x (VO 4 ) 6 Low-temperature sintered microwave ceramic material and its preparation method. [0002] technical background [0003] Microwave ceramic materials play an important role in modern communications and have been used in many fields such as mobile phones, satellites, and radars. Microwave ceramics in practical applications usually require good microwave dielectric properties and a sintering temperature as low as possible. In order to meet the latter, research at home and abroad often adopts the method of reducing the burning of sintering aids, but this method will bring more cumbersome manufacturing process and higher cost. Therefore, the importance of developing microwave ceramic materials with good microwave dielectric properties and low intrinsic sintering temperature is more obvious. [0004] The discovery of garnet-type vanadate meets the abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626
CPCC04B35/495C04B35/622C04B35/62605C04B2235/3206C04B2235/3208C04B2235/3275C04B2235/602C04B2235/6567
Inventor 李波刘伟张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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