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Microwave dielectric material suitable for ultralow-temperature sintering and preparation method thereof

A microwave dielectric material and ultra-low temperature technology, applied in the field of microwave dielectric materials, can solve the problems of easy moisture absorption, toxicity of tellurium oxide, high price, etc., and achieve the effects of stable performance, widening the selection range, and reducing volatilization

Active Publication Date: 2020-06-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, molybdate ultra-low temperature sintered ceramic materials take into account the advantages of environmental protection and low cost, but they are easy to absorb moisture and cannot be stored stably; tellurate microwave dielectric ceramic materials have excellent microwave dielectric properties, but tellurium oxide is toxic and expensive , not suitable for long-term applications; most tungstate and vanadate microwave dielectric materials have low loss and high sintering temperature; there are few developments for boron-based ultra-low temperature sintered microwave dielectric materials

Method used

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  • Microwave dielectric material suitable for ultralow-temperature sintering and preparation method thereof
  • Microwave dielectric material suitable for ultralow-temperature sintering and preparation method thereof
  • Microwave dielectric material suitable for ultralow-temperature sintering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0035] Bi 2 o 3 -B 2o 3 Microwave dielectric properties of several microwave dielectric materials in the system. The Bi of these microwave dielectric materials 2 o 3 and B 2 o 3 The molar ratio between is x:y, wherein: 1≤x≤12, 1≤y24 B 2 o 39 (Bi / B=12 / 1), Bi 24 B 2 o 39 +Bi 4 B 2 o 9 (Bi / B=4 / 1), Bi 4 B 2 o 9 (Bi / B=2 / 1), Bi 4 B 2 o 9 +Bi 6 B 10 o 24 (Bi / B=1 / 1, 2 / 3), Bi 6 B 10 o 24 (Bi / B=3 / 5), Bi 6 B 10 o 24 +Bi 2 B 8 o 15 (Bi / B=1 / 3). Prepare the microwave dielectric ceramic according to the following method:

[0036] (1) B with purity ≥ 98% 2 o 3 with Bi 2 o 3 as raw material, according to Bi 2 o 3 -B 2 o 3 In the system, Bi / B=12 / 1, 4 / 1, 2 / 1, 1 / 1, 2 / 3, 3 / 5, 1 / 3 (mol ratio) for batching, put the powder into the ball mill tank, and ball mill , and then pre-fired to obtain pre-fired ceramic powder;

[0037] (2) The pre-fired ceramic powder obtained in the step (1) is subjected to wet ball milling again, after drying, adding a binder to gra...

Embodiment 8～14

[0045] Its chemical formula is Bi 6 B 10 o 24 . Prepare the microwave dielectric ceramic according to the following method:

[0046] (1) B with purity ≥ 98% 2 o 3 with Bi 2 o 3 As raw material, according to the chemical formula Bi 6 B 10 o 24 The stoichiometric ratio is used for batching, the powder is put into a ball mill tank, ball milled, and then pre-fired to obtain a pre-fired ceramic powder;

[0047] (2) The pre-fired ceramic powder obtained in the step (1) is subjected to wet ball milling again, after drying, adding a binder to granulate, and then sintering after tableting to obtain the microwave dielectric ceramic.

[0048] The ball milling in step (1) is dry ball milling, using a planetary ball mill, and the ball milling time is 2 hours. Using dry ball milling and controlling the appropriate ball milling time not only ensures uniform mixing, but also solves the problem of B during drying after wet ball milling. 2 o 3 volatility problem.

[0049] The pre-...

Embodiment 15～17

[0055] Its chemical formula is Bi 6 B 10 o 24 . Prepare the microwave dielectric ceramic according to the following method:

[0056] (1) B with purity ≥ 98% 2 o 3 with Bi 2 o 3 As raw material, according to the chemical formula Bi 6 B 10 o 24 The stoichiometric ratio is used for batching, the powder is put into a ball mill tank, ball milled, and then pre-fired to obtain a pre-fired ceramic powder;

[0057] (2) The pre-fired ceramic powder obtained in the step (1) is subjected to wet ball milling again, after drying, adding a binder to granulate, and then sintering after tableting to obtain the microwave dielectric ceramic.

[0058] The ball milling in step (1) is dry ball milling, using a planetary ball mill, and the ball milling time is 2 hours. Using dry ball milling and controlling the appropriate ball milling time not only ensures uniform mixing, but also solves the problem of B during drying after wet ball milling. 2 o 3 volatility problem.

[0059] The pre-...

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Abstract

The invention relates to a microwave dielectric material suitable for ultralow-temperature sintering and a preparation method thereof, the microwave dielectric material is a Bi2O3-B2O3 system, the molar ratio of Bi2O3 to B2O3 of the microwave dielectric material is x: y, x is greater than or equal to 1 and less than or equal to 12, and y is greater than or equal to 1 and less than 4. The preparation method comprises the following steps: (1) taking B2O3 and Bi2O3 as raw materials, mixing the B2O3 and the Bi2O3 according to a molar ratio of x: y, putting the powder into a ball milling tank, carrying out ball milling, and then pre-sintering to obtain pre-sintered ceramic powder; and (2) carrying out wet ball milling treatment on the pre-sintered ceramic powder obtained in the step (1), drying, adding an adhesive, granulating, tabletting, discharging the adhesive, and sintering to obtain the microwave dielectric material. The preparation process is simple, the preparation cost is low, thehigh-performance microwave dielectric material suitable for ultralow-temperature sintering is successfully developed by adopting an improved solid-phase reaction method, and the preparation method atultralow temperature provides convenience for integration of the substrate and a microwave circuit.

Description

technical field [0001] The invention relates to a microwave dielectric material, more specifically to a microwave dielectric material suitable for ultra-low temperature sintering and a preparation method thereof. Background technique [0002] As a new type of functional material, microwave dielectric materials have been widely used in microwave devices such as resonators, filters, and dielectric antennas. Low temperature co-fired ceramics (LTCC) technology is one of the core technologies of the new generation of electronic information manufacturing industry, which provides an ideal platform for the integration of passive electronic devices and the system-level packaging technology of electronic complete machines. Low temperature co-fired ceramic media is the key material of this technology. In the field of LTCC, the sintering temperature of most of the materials studied so far is around 900°C, which cannot meet the requirements of ULTCC. People have begun to pay attention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622C04B35/626C04B35/64
CPCC04B35/453C04B35/622C04B35/6261C04B35/64C04B2235/3409C04B2235/6562C04B2235/6567C04B2235/96
Inventor 戴英张倩孙思齐裴新美
Owner WUHAN UNIV OF TECH
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