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Microwave dielectric ceramic material and preparation method thereof
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A microwave dielectric ceramic and mass fraction technology, applied in the field of information functional materials, can solve the problems of unstable performance and high dielectric constant ε, and achieve the effect of good uniformity
Active Publication Date: 2020-09-22
XIAMEN SUNYEAR ELECTRONICS CO LTD
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[0003] The purpose of the present invention is to provide a microwave dielectric ceramic material and its preparation method to
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[0028] The present invention also provides a method for preparing the above-mentioned microwave dielectric ceramic material, comprising the following steps:
[0029] ① Preparation of Mg as one of the main materials 2-3x Ca x TiO 4-2x Powder: according to the ratio of each metal element in the compound, weigh the corresponding quality of high-purity, ultra-fine Mg(OH) 2 , CaCO 3 、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, use a spray drying tower or other methods to dry, Calcined in an air atmosphere furnace at a temperature range of 1050°C to 1300°C for 2 to 4 hours to finally obtain Mg 2-3x Ca x TiO4-2x powder. Among them, Mg(OH) 2 The specific surface area is greater than 7.0m 2 / g,TiO 2 The specific surface area is greater than 5.0m 2 / g.
[0030] ② Preparation of another component of CaS...
Embodiment
[0041] This embodiment provides a microwave dielectric ceramic material and a preparation method thereof, and the solution of the present invention is not limited to the embodiment.
[0042] (1) According to Mg 2-3x Ca x TiO 4-2x Composition, wherein 0.01≤x≤0.50, the raw material formula shown in Table 1, weigh three groups of Mg(OH) with corresponding mass 2 , CaCO 3 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 1200 ° C 3 hours. In each group of samples: in MCT1, x=0.05; in MCT2, x=0.25; in MCT3, x=0.50.
[0043] Table 1 Mg 2-3x Ca x TiO 4-2x Example formulation
[0044]
[0045] (2) According to CaSiO 3 Composition, calcium carbonate and silicon dioxide are arranged in the ball mill according to the molar ratio of 1:1, according to the ratio of soli...
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Abstract
The invention provides a microwave dielectric ceramic material, and relates to the field of information functional materials. The microwave dielectric ceramic material comprises a main material and amodified additive; the chemical formula of the main material is Mg (2-3x) CaxTiO (4-2x). yCaSiO<3>, x is more than or equal to 0.01 and less than or equal to 0.50, and y is more than 0.00 and less than or equal to 0.20; wherein the mass fraction of the main material in the microwave dielectric ceramic material is 99.2 wt%-99.8 wt%; the mass fraction of the modified additive in the microwave dielectric ceramic material is 0.2-0.8 wt%. And the modified additive is selected from one or more of BaCO3, SrCO3, ZnO, MnCO3, Sb2O3, SiO2 and MnO2. The ceramic dielectric material disclosed by the invention is a lead-free environment-friendly material; Mg (2-3x) Ca<x>TiO (4-2x) and CaSiO3 are synthesized by adopting a solid-phase synthesis method and are used as components of main materials; the modified additive is doped, reasonably designed formula is adopted, synthesis process is optimized, the average particle size of the prepared powder is 0.4 to 1.0 <mu>m; an electronic ceramic device prepared from the powder can be sintered into ceramic within the temperature range of 1300-1380 DEG C, the dielectric constant epsilon of the electronic ceramic device ranges from 18 to 23, the quality factor Qf value of the electronic ceramic device is larger than or equal to 40000 GHz, and the temperature coefficient tau f is (-40 DEG C to 85 DEG C): +/-10 ppm/DEG C.
Description
technical field [0001] The invention relates to the field of information functional materials, and in particular to a medium-low dielectric constant microwave dielectric ceramic material 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 quantities and low prices for civi...
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