Pressure control adjustable strontium barium titanate-based composite ceramic materials and method for preparing same

A technology of composite ceramics and strontium barium titanate, which is applied in the field of voltage-controlled adjustable strontium barium titanate-based composite ceramic materials and its preparation, can solve the problem of high microwave dielectric loss and achieve the effect of improving sintering performance

Active Publication Date: 2009-01-07
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microwave dielectric loss is too high, which is the bottleneck of the current research and development of ferroelectric phase shifters.

Method used

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  • Pressure control adjustable strontium barium titanate-based composite ceramic materials and method for preparing same
  • Pressure control adjustable strontium barium titanate-based composite ceramic materials and method for preparing same
  • Pressure control adjustable strontium barium titanate-based composite ceramic materials and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Press Ba 0.6 Sr 0.4 TiO 3 Stoichiometric Dosage Ratio Weighing BaCO 3 , SrCO 3 and TiO 2 , put into the agate mixing tank, add agate balls and alcohol, mix on the three-roller mixer for 24 hours, the volume ratio of agate balls, alcohol and powder is 6:2:1, and mix the above slurry at 100°C Dry in an oven, and then pre-burn in air at 1100 °C for 4 hours to obtain Ba 0.6 Sr 0.4 TiO 3 Powder. by Mg 0.9 Zn 0.1 O stoichiometric ratio Weigh MgO and ZnO, use the same method to prepare Mg 0.9 Zn 0.1 O powder. The X-ray analysis results of these two powders are as follows: figure 1 shown.

[0042] By (1-m) Ba 0.6 Sr 0.4 TiO 3 -mMg 0.9 Zn 0.1 The weight percent m in O is 30%, 40%, 50%, 60% and 65%, respectively, and Ba 0.6 Sr 0.4 TiO 3 and Mg 0.9 Zn 0.1 O, then the Ba of the above five m values 0.6 Sr 0.4 TiO 3 and Mg 0.9 Zn 0.1 O powders were respectively put into the agate mixing tank, added agate balls and alcohol and mixed on a three-roll mixer f...

Embodiment 2

[0048] Using the same process as in Example 1 to prepare Ba respectively 0.6 Sr 0.4 TiO 3 and Mg 1-y Zn y O ceramic powder, where y values ​​are 0, 0.05, 0.1, 0.15 and 0.2 respectively, and Mg 1-y Zn y O at (1-m) Ba 0.6 Sr 0.4 TiO 3 -mMg 1-y Zn y The weight percentage m in O composite ceramics is 65%, that is, 35% Ba 0.6 Sr 0.4 TiO 3 -65% Mg 1-y Zn y O composite ceramics.

[0049] Figure 7 for Mg 1-y Zn y The XRD analysis result of O powder, it can be seen that, within the range of ZnO doping amount of the present invention, Mg 1-y Zn y O is a single solid solution, and the crystal structure type of the solid solution is consistent with MgO crystal, while MgO is a cubic crystal system, and ZnO is a hexagonal crystal system.

[0050] Figure 8 for Ba 0.6 Sr 0.4 TiO 3 -Mg 1-y The test curves of tuning rate, dielectric loss and FOM value of ZnyO composite ceramics with a test frequency of 500 Hz as a function of y value.

[0051] Table 2 lists the 35% B...

Embodiment 3

[0055] 36wt.% Ba was prepared by the same process as in Example 1 0.6 Sr 0.4 TiO 3 -64% Mg 0.9 Zn 0.1 O composite ceramic powder. Divide the composite ceramic powder into five parts and add Ta 2 o 5 Powder, Ta 2 o 5 The weight percent content is respectively 0.00wt, 0.10wt, 0.50wt, 1.00wt and 2.00wt, and then respectively put into agate jars, and then add agate balls and alcohol. Put it on a three-roller mixer and mix for 24 hours. The volume ratio of agate balls, alcohol and ceramic powder is 6:2:1. The slurry was dried in an oven at 100°C, and after uniaxial cold pressing and cold isostatic pressing, it was sintered at 1440°C under normal pressure for 5 hours, and then the five kinds of Ta 2 o 5 The dielectric properties of the composite ceramics with weight percent content were analyzed, and the analysis results are shown in Table 3.

[0056] Table 336wt.% Ba 0.6 Sr 0.4 TiO 3 -64% Mg 0.9 Zn0.1O-Ta 2 o 5 Dielectric Properties of Ceramics

[0057] ...

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Abstract

The invention belongs to the technical field of preparation of microwave ceramics, in particular relates to a pressure control adjustable barium strontium titanate-base compound ceramic material and a preparation method thereof. The compound ceramic material is prepared as follows: Ba(1-x)SrxTiO3 is compounded with Mg(1-y)ZnyO with low dielectric constant and low dielectric loss; little Ta2O5 is added to modify the compound ceramics of (1-m)Ba(1-x)SrxTiO3-mMg(1-y)ZnyO so as to meet the performance requirements of pressure control adjustable microwave ceramics with proper dielectric constant, low microwave dielectric loss, high pressure control adjustability and so on. The barium strontium titanate-base compound ceramic material prepared by adopting the solid reaction process or the coprecipitation coating process is cold isostatic compacted without adding any forming agent and is sintered under atmospheric pressure, thus obtaining high density and high purity ceramic blocks. The pressure control adjustable barium strontium titanate-base compound ceramic material is applicable for such microwave devices as phased array phasers, adjustable filters, delay lines, oscillators, resonators and so on.

Description

technical field [0001] The invention belongs to the technical field of microwave ceramic preparation, and in particular relates to a voltage-controlled and adjustable strontium barium titanate-based composite ceramic material and a preparation method thereof. The material is especially suitable for microwave devices such as phased array phase shifters, tunable filters, delay lines, oscillators, and resonators. Background technique [0002] Phased array radar is a new type of active electronically scanned array multifunctional radar. It not only has the function of traditional radar, but also has other radio frequency functions. The most important feature of the active electronically scanned array is that it can radiate and receive radio frequency energy directly into the air. Compared with the mechanical scanning antenna system, it has many significant advantages: the phased array radar omits the entire antenna drive system, and when individual components fail, it still ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/453C04B35/622
Inventor 董桂霞崔建东马书旺杨志民杜军毛昌辉
Owner GRIMAT ENG INST CO LTD
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