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A high-dielectric tunable barium strontium titanate-based composite aluminosilicate ceramic dielectric material

A technology for compounding aluminosilicate and barium strontium titanate, which is applied in the field of electronic materials and devices

Inactive Publication Date: 2020-10-20
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall performance of the system needs to be further improved
There are no related reports on the microwave dielectric tunable properties of barium strontium titanate composite aluminosilicate materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) According to 70%Ba 0.6 Sr 0.4 TiO 3 +30%Sr 2 al 2 SiO 7 The stoichiometric ratios of Ba, Sr, Ti, Si and Al were weighed in BaCO 3 11.680g, SrCO 3 13.083g, TiO 2 7.871g 、Al 2 o 3 2.488g and SiO 2 1.484g, put the prepared raw materials in a nylon ball mill tank, add zirconia balls and ball milling media, and then ball mill. After drying, the mixed powder is obtained by pre-calcining and grinding at 1000°C, 1300°C, and 4 hours respectively. ;

[0017] (2) Add the mixed powder described in (1) into zirconia balls and absolute ethanol or deionized water for 20 hours of ball milling, and then sieve the mixed powder 2 after discharging and drying;

[0018] (3) Uniformly mix and granulate the mixed powder 2 described in (2) plus an 8% polyvinyl alcohol aqueous solution by weight, and then press under a pressure of 10MPa to form a ceramic green sheet;

[0019] (4) The ceramic green sheet described in (3) is degummed at a temperature of 550°C for 4 hours, and then...

Embodiment 2

[0023] (1) According to 50% Ba 0.5 Sr 0.5 TiO 3 +50% (Sr 0.92 Ba 0.08 ) 2 Al 2 SiO 7 The stoichiometric ratios of Ba, Sr, Ti, Si and Al were weighed in BaCO 3 8.376g, SrCO 3 16.278g, TiO 2 5.756g 、Al 2 o 3 4.058g and SiO 2 2.391g, put the prepared raw materials in a nylon ball mill tank, add zirconia balls and ball milling media, and then ball mill. After drying, the mixed powder is obtained by pre-calcining and grinding at 1100°C, 1250°C, and 4 hours respectively. ;

[0024] (2) Add the mixed powder described in (1) into zirconia balls and absolute ethanol or deionized water for 21 hours of ball milling, and then sieve the mixed powder 2 after discharging and drying;

[0025] (3) Uniformly mix and granulate the mixed powder 2 described in (2) plus 8.5% polyvinyl alcohol aqueous solution by weight, and then press it under a pressure of 30MPa to form a ceramic green sheet;

[0026] (4) The ceramic green sheet described in (3) was degummed at a temperature of 560°C...

Embodiment 3

[0030] (1) According to 90%Ba 0.6 Sr 0.4 TiO 3 +10%Sr 2 Al 2 SiO 7 The stoichiometric ratios of Ba, Sr, Ti, Si and Al were weighed in BaCO 3 15.017g, SrCO 3 9.972g, TiO 2 10.120g 、Al 2 o 3 0.829g and SiO 2 0.495g, put the prepared raw materials in a nylon ball mill tank, add zirconia balls and ball milling media, and then ball mill. After drying, the mixed powder is obtained by pre-calcining and grinding at 1000°C, 1300°C, and 2 hours respectively. ;

[0031] (2) Add the mixed powder described in (1) into zirconia balls and absolute ethanol or deionized water for 22 hours of ball milling, and then sieve the mixed powder 2 after discharging and drying;

[0032] (3) Uniformly mix and granulate the mixed powder 2 described in (2) plus a 9% polyvinyl alcohol aqueous solution by weight, and then press it under a pressure of 50 MPa to form a ceramic green sheet;

[0033] (4) The ceramic green sheet described in (3) was degummed at a temperature of 580°C for 8 hours, and ...

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Abstract

A high-dielectric adjustable strontium barium titanate-based composite aluminosilicate ceramic dielectric material is characterized in that the component general formula of the high-dielectric adjustable strontium barium titanate-based composite aluminosilicate ceramic dielectric material is is: (1‑m%)Ba 1‑z Sr z TiO 3 +m%(Sr 1‑x Ba x ) 2 Al 2 SiO 7 , where the value range of x is 0≤x≤0.9; the value range of z is 0.4≤z≤0.6; the value range of m is 10wt%≤m%≤90wt%, and BaCO 3 , SrCO 3 、TiO 2 , SiO 2 and Al 2 o 3 The powder is compounded, ball milled, dried, and pre-fired at high temperature to obtain a mixed powder. After tableting, it is pre-fired at a temperature of 550°C~600°C, and then fired at a temperature of 1200°C~1500°C. The highly dielectrically adjustable strontium barium titanate-based composite aluminosilicate ceramic dielectric material can be continuously adjusted in a wide range and has high comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, in particular to a strontium barium titanate-based composite aluminosilicate ceramic dielectric material with adjustable high dielectric and its preparation. Background technique [0002] The ferroelectric material with perovskite structure strontium barium titanate with high dielectric constant, low dielectric loss, non-linear adjustable dielectric constant and adjustable Curie temperature is used as a microwave tunable device (such as phase shifter, filter devices, variable capacitors and delay lines, etc.) have received increasing attention, especially as a microwave phase shifter is a current research hotspot. However, the BST ceramic material with high dielectric constant is difficult to meet the requirements of internal impedance matching and high power of the excitation source, which greatly limits its application in the field of microwave tunable devices. Q The v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/4682C04B35/622C04B2235/3213C04B2235/3215C04B2235/3217C04B2235/3418C04B2235/3481C04B2235/656C04B2235/96
Inventor 张明伟辛乐郭冲范恒辉刘志伟沈世婷
Owner SHANDONG UNIV OF TECH
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