Yttrium niobate solid-phase reaction synthetic sintering method capable of being used for microwave dielectric ceramic

A technology of microwave dielectric ceramics and solid phase reaction, which is applied in the field of functional ceramic materials, can solve the problems of preparation methods and dielectric properties that have not been reported in special research reports, and achieve the effect of simple process

Inactive Publication Date: 2008-05-21
BEIJING JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

Existing research results and structural analysis show that, because the structure is similar to the currently commonly used calcium titanate structural ceramics, and has the [NbO 6 ] Octahedron is the layered structure of the skeleton, and it also has

Method used

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  • Yttrium niobate solid-phase reaction synthetic sintering method capable of being used for microwave dielectric ceramic
  • Yttrium niobate solid-phase reaction synthetic sintering method capable of being used for microwave dielectric ceramic

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Embodiment Construction

[0023] A solid phase reaction synthesis and sintering method of yttrium niobate that can be used for microwave dielectric ceramics, the specific steps of the method:

[0024] Step 1, weigh 1:1 equimolar Y 2 o 3 , Nb 2 o 5 Powder, Nb 2 o 5 The purity is 99.9%, d 50 = 8.3 µm and Y 2 o 3 The purity is 99.8%, d 50 =7.9 microns, placed in an alumina ball mill jar.

[0025] Step 2: Weigh agate balls with a diameter of 12mm in an alumina ball milling jar according to the volume ratio of the ball to material at 2:1; weigh anhydrous ethanol into the alumina ball milling jar at a volume ratio of 0.7:1 for the liquid material.

[0026] Step 3, ball milling, fixing the ball mill jar on the planetary ball mill, and ball milling at 180r / min for 8 hours.

[0027] Step 4, drying and sieving, separate the mixed slurry and dry it in a drying oven at 60°C; first sieve with 200 mesh, then 100 mesh, repeat the operation twice to obtain evenly mixed raw materials ;

[0028] Step 5, comp...

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Abstract

The invention relates to a microwave dielectric function ceramic material which is yttrium niobate and discloses a solid state reaction synthesis sintering method of the yttrium niobate which is a synthesis method with the advantages of abundant raw materials and simple and economical process. The method is: Y2O3 powder and Nb2O5 powder are weighed according to the molar ratio of 1 to 1, the purity of Nb2O5 is 99.9 percent, d50 is equal to 8.3 micrometers, the purity of the Y2O3 is 99.8 percent, and d50 is equal to 7.9 micrometers; milling balls are weighted according to the ball-material ratio of 2 to 1, and dehydrated alcohol is weighted according to the liquid-material ratio of 0.7 to 1 and is put in a ball milling tank to be milled. The mixed slurry is separated from the milling balls, dried, sieved, pressed to be molded, sintered at the temperature of 1100-1350 DEG C, cooled and sintered into the YNbO4 ceramic through the solid phase reaction. The room temperature dielectric constant of the YNbO4 is 7- 26 and the quality factor is 0.7*10<3>-27*10<4>.

Description

technical field [0001] The invention relates to a functional ceramic material. Prepared YNbO 4 The ceramic material can be used as a microwave dielectric ceramic material. Background technique [0002] Niobate materials are an important class of electronic materials and have been widely used in the manufacture of capacitors and optoelectronic devices. Later, J.Cato et al. studied their dielectric properties at microwave frequencies, and found that such materials have high dielectric constants and Q values ​​at microwave frequencies, and the temperature coefficient of resonance frequency is close to zero. interest of. Since the 1980s, due to the rapid development of mobile communication and satellite communication to the microwave frequency band, the research of new niobate microwave dielectric ceramic materials has attracted more and more attention. [0003] Similar to perovskite-type composite oxides with [TiO6] octahedron as the framework, niobate materials generally h...

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 张志力刘秋平许春
Owner BEIJING JIAOTONG UNIV
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