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Preparation method of glass phase free two-phase composite microwave dielectric ceramic material Li2TiO3-Li2WO4

A technology of microwave dielectric ceramics and glass phases, applied in the field of preparation of low-temperature microwave dielectric ceramic materials, can solve the problems of reducing the Q value of materials, cracking of terminal electrodes, etc., and achieve the effect of high quality factor

Inactive Publication Date: 2013-09-04
SHANGHAI UNIV
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Problems solved by technology

But generally speaking, the introduction of impurity phases or sintering aids will always reduce the Q value of the material to varying degrees, and with the increase of the glass phase addition, especially when the glass phase addition exceeds 5%, due to the glass phase The thermal expansion coefficient is quite different from that of ceramics, and cracks will occur during the welding process of the terminal electrodes

Method used

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  • Preparation method of glass phase free two-phase composite microwave dielectric ceramic material Li2TiO3-Li2WO4
  • Preparation method of glass phase free two-phase composite microwave dielectric ceramic material Li2TiO3-Li2WO4
  • Preparation method of glass phase free two-phase composite microwave dielectric ceramic material Li2TiO3-Li2WO4

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[0018] Now the concrete example of microwave dielectric ceramic material of the present invention is described as follows: According to (1-x) Li 2 TiO 3 -xLi 2 WO 4 (x=0.05, 0.10, 0.15, 0.20) chemical formula, convert the mass of each raw material required, and then accurately weigh each analytical pure raw material: Li 2 CO 3 (99.9%), TiO 2 (99.7%), WO 3 (99.0%). The weighing quality is shown in Table 1.

[0019]

[0020] Put the accurately weighed raw materials into the resin ball mill tank, add alcohol and ZrO 2 Grinding balls; the weight ratio of the three is: material: balls: alcohol = 1:4:0.5; ball milling for 24 hours, after mixing evenly, discharge the material, dry it at 100°C; then briquette at 500~800°C Calcined for 2 hours to synthesize two single-phase ceramic powders respectively, grind the synthesized above-mentioned ceramic materials with a mortar and pass through a 40-mesh sieve, then weigh the two single-phase powders according to the two-phase co...

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Abstract

The invention relates to a preparation method of a glass phase free two-phase composite microwave dielectric ceramic material Li2TiO3-Li2WO4, and belongs to the technical field of a special ceramic material process. The glass phase free microwave dielectric ceramic material provided by the invention is characterized by having the chemical formula show as (1-x)Li2TiO3-xLi2WO4, wherein x is mole fraction in chemometry and x is equal to 0.05-0.20. The process provided by the invention mainly comprises the following steps of: first, respectively synthesizing two single-phase ceramic powder; briquetting and calcining for 2 hours at 500-800 DEG C; then, grinding and sieving; weighing two single-phase powder according to two-phase composite proportion, and further ball-milling and sieving; then prilling and dry pressing; then, sintering for 2 hours at 800-950 DEG C; and finally preparing the two-phase composite microwave dielectric ceramic material.

Description

technical field [0001] The invention relates to a preparation method of a low-temperature microwave dielectric ceramic material without glass phase addition, belonging to the technical field of special ceramic materials. Background technique [0002] The popularization of mobile communication equipment puts forward higher requirements for the high integration, miniaturization, high reliability and low cost of microwave communication equipment. Since the wavelength of the electromagnetic wave in the dielectric waveguide is only (εr) in free space -1 / 2 , so the application of the dielectric waveguide can reduce the size of the waveguide element to the original (εr) -1 / 2 times. In addition, due to the existence of a complete magnetic interface at the beginning of the dielectric waveguide, radiation loss occurs, which can further reduce the size of the entire waveguide component. In a word, only the application of dielectric materials with good microwave dielectric propertie...

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 卞建江王振丁耀民吴家胤罗世金
Owner SHANGHAI UNIV
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