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Microwave dielectric ceramic material with near-zero temperature coefficient at high temperature and preparation method thereof

A technology of microwave dielectric ceramics and temperature coefficient, which is applied in the field of information functional materials, can solve the problems of large temperature coefficient, high temperature coefficient of microwave devices, production difficulties, etc., and achieve the effect of good material uniformity

Active Publication Date: 2021-06-11
XIAMEN SUNYEAR ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to provide a microwave dielectric ceramic material with near-zero temperature coefficient at high temperature and its preparation method, so as to solve the problem that the current microwave dielectric ceramic material with a dielectric constant in the range of 17-25 has a large temperature coefficient and poor performance reliability
The present invention adopts one-time synthesis of ceramic base materials, supplemented by a certain doping dose, and obtains a microwave dielectric ceramic material with a near-zero temperature coefficient at high temperature, which solves the problems of difficult production and large temperature coefficient of microwave devices in the dielectric constant range

Method used

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  • Microwave dielectric ceramic material with near-zero temperature coefficient at high temperature and preparation method thereof
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  • Microwave dielectric ceramic material with near-zero temperature coefficient at high temperature and preparation method thereof

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preparation example Construction

[0029] The present invention also provides a method for preparing the above-mentioned microwave dielectric ceramic material, comprising the following steps:

[0030] ① Preparation of base material powder: according to the ratio of each metal element in the compound, weigh the corresponding mass of Ln 2 o 3 (where Ln is selected from one or more of La, Y, Ce, Sm, Dy, Ho, Er, Nd), Mg(OH) 2 , CaCO 3 , SrCO 3 , SiO 2 、TiO 2 , placed in a ball mill, according to the mass ratio of solid material: water = 1: (1.0 ~ 2.0), add water to carry out ball milling and mix evenly, after the sand milling treatment reaches a certain particle size (the particle size D50 under the laser particle size analyzer is 0.6- 1.5um), dried by spray drying tower or other methods, and calcined in the temperature range of 1150°C to 1250°C in an air atmosphere furnace for 2 to 4 hours, and finally obtained the chemical expression: (Mg, Ca, Sr) x ln 2y (Si,Ti)O 2+x+3y The starting base powder. Among t...

Embodiment

[0043] This embodiment provides a microwave dielectric ceramic material with a near-zero temperature coefficient at high temperature and a preparation method thereof, and the solution of the present invention is not limited to the embodiment.

[0044] (1) According to the chemical expression: (Mg, Ca, Sr) x ln 2y (Si,Ti)O 2+x+3y , where 0.80≤x≤1.20, 0.002 o 3 , Mg(OH) 2 , CaCO 3 , SrCO 3 , SiO 2 and TiO 2 , placed in the ball mill in turn, according to the mass ratio of each group of solid materials: deionized water = 1:1.5, add deionized water for wet ball milling, after ball milling, use a spray drying tower to dry, and calcined in an air furnace at 1240 ° C 3 hours. In each group of samples: in MSCT1, x=0.85, y=0.03; in MSCT2, x=0.95, y=0.02; in MSCT3, x=1.05, y=0.01.

[0045] Table 1 (Mg, Ca, Sr) x ln 2y (Si,Ti)O 2+x+3y Example formulation

[0046]

[0047] (2) According to the chemical composition of the sample in Table 2, weigh the base material obtained ...

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Abstract

The invention provides a microwave dielectric ceramic material with a near-zero temperature coefficient at a high temperature and a preparation method thereof, and relates to the field of information function materials. The ceramic material comprises a base material and a modified additive. The chemical expression of the base material is (Mg,Ca,Sr)xLn2y(Si,Ti)O2+x+3y, the x is more than or equal to 0.80 and less than or equal to 1.20, the y is more than 0.00 and less than or equal to 0.03, and the Ln is selected from one or more of La, Y, Ce, Sm, Dy, Ho, Er and Nd; the base material is 98.5-100 wt% of the microwave dielectric ceramic material by mass fraction; and the modified additive is 0-1.5 wt% of the microwave dielectric ceramic material by mass fraction. The ceramic material is a lead-free environment-friendly material, the ceramic base material is synthesized through solid-phase synthesis by one time, and is supplemented by the certain doping modification additive, the dielectric constant of a prepared electronic ceramic device is 17-25, the quality factor is larger than or equal to 40000 GHz, the temperature coefficient tauf (-55 to 125 DEG C) is smaller than + / -5 ppm / DEG C, and the temperature coefficient tauf is smaller than + / -5 ppm / DEG C within the full temperature range of 180 DEG C. The ceramic material has good uniformity, is suitable for manufacturing microwave devices, and is particularly suitable for being used in an environment with large temperature difference.

Description

technical field [0001] The invention relates to the field of information functional materials, and in particular to a microwave dielectric ceramic material with near-zero temperature coefficient at high temperature and a preparation method thereof. Background technique [0002] Microwave dielectric ceramic materials are a new type of functional ceramic materials developed rapidly in recent years. It has the characteristics of low dielectric loss, high dielectric constant ε and stable temperature coefficient of dielectric constant τf. It is the core basic material of new microwave circuits and devices including dielectric resonators, filters, oscillators, duplexers, antennas, dielectric substrates, etc. It is widely used in modern microwave communication and satellite navigation systems and equipment. In recent years, due to the rapid development of microwave technology equipment towards miniaturization, integration, and low power consumption, especially towards large quanti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/622C04B35/638
CPCC04B35/465C04B35/622C04B35/638C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3286C04B2235/3418C04B2235/6562C04B2235/6567C04B2235/96
Inventor 杨和成张军志罗昌宸
Owner XIAMEN SUNYEAR ELECTRONICS CO LTD
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