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Lithium-zinc-titanium-tin series microwave dielectric ceramics material and preparation method thereof

A microwave dielectric ceramic and lithium-zinc technology is applied in the field of new Li2Zn3O8 series microwave dielectric ceramic materials and their preparation to achieve the effect of excellent microwave dielectric properties

Inactive Publication Date: 2013-05-01
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its quality factor needs to be improved, so as to ensure low loss when receiving and transmitting signals
Although the researchers have for Li 2 ZnTi 3 o 8 In-depth research on ceramics, but for Li 2 Zn(Ti 1-x sn x ) 3 o 8 There are no special reports on the preparation and microwave dielectric properties of ceramics

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  • Lithium-zinc-titanium-tin series microwave dielectric ceramics material and preparation method thereof

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Embodiment Construction

[0017] Will Li 2 CO 3 , ZnO, TiO 2 and SnO 2 Moore Billy 2 CO 3 :ZnO:TiO 2 : SnO 2 =1:1:3(1-x):x (where 0<x≤1.0) Weigh the ingredients. Put the mixed powder into a polyester tank, add deionized water and zirconia balls, the mass ratio of material, water, and balls is 1:7:7, and mill on a planetary ball mill for 4 to 6 hours at a speed of 1000 rpm / Minute. Then the ball-milled raw materials are dried in a 1500W infrared drying oven, and the raw materials are passed through a 40-mesh sieve after drying. The sieved powder was pre-fired at 900°C for 3 hours, and kept at this temperature for 4 hours to synthesize the main crystal phase. Add deionized water to the pre-burned powder, mill for 4 to 6 hours, dry and add 8% paraffin as a binder to granulate, pass through an 80-mesh sieve, and press the powder into tablets The machine is pressed into a cylinder of Φ10mm×5mm under the pressure of 4MPa. Then sinter the green body at 1040~1120℃ and keep it warm for 2~6 hours to o...

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Abstract

The invention discloses a lithium-zinc-titanium-tin series microwave dielectric ceramics material and a preparation method thereof. A stoichiometric equation is Li2Zn(Ti(1-x)Snx)3O8, wherein x is larger than 0 and is less than or equal to 1. The preparation method comprises the following steps of: compounding Li2CO3, ZnO, TiO2 and SnO2 according to molar ratio; carrying out ball milling; stoving; carrying out presintering at the temperature of 900 DEG C; carrying out secondary ball milling; and sintering at the temperature of 1040-1120 DEG C finally to obtain microwave dielectric ceramics. When x is equal to 0.2, a dielectric constant is 22.1, a resonant frequency temperature coefficient is -22.5ppm / DEG C, and a quality factor reaches 80500 GHz. The preparation method successfully prepares the lithium-zinc-titanium-tin series microwave dielectric ceramics for the first time, and can be applied in a crossing field of microwave dielectric ceramics and multifunctional ceramics.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by composition, in particular to a novel Li 2 Zn(Ti 1-x sn x ) 3 o 8 The invention relates to a microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] At present, in order to obtain practical microwave dielectric ceramic materials, ceramic materials need to meet three requirements: (1) Higher dielectric constant ε r , which is convenient for the miniaturization of the device; (2) high quality factor (Q×f value), ensuring excellent frequency selection characteristics; (3) near-zero resonant frequency temperature coefficient τ f , to ensure stability. [0003] In recent years, researchers have studied SnO 2 For Ba(Zn 1 / 3 Nb 2 / 3 )O 3 and ZnO–TiO 2 The influence of crystal phase and microwave dielectric properties of microwave dielectric ceramics, the research results show that SnO 2 The microwave dielectric properties of dielectric ceram...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/457C04B35/46C04B35/622
Inventor 张平王月华燕波
Owner TIANJIN UNIV
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