Rapidly-molded microwave dielectric ceramic and preparation method thereof

A microwave dielectric ceramic and fast technology, applied in the field of microwave dielectric ceramic manufacturing, can solve the problems of toxicity, poor sample uniformity, and internal bubble holes, etc., and achieve the effect of excellent performance, excellent performance, and improved green strength

Inactive Publication Date: 2018-09-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, there are the following problems: the organic monomer has certain toxicity, the sample uniformity is poor, and there are bubble holes in it, so it has not been applied in the field of microwave dielectric ceramic preparation.

Method used

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  • Rapidly-molded microwave dielectric ceramic and preparation method thereof
  • Rapidly-molded microwave dielectric ceramic and preparation method thereof
  • Rapidly-molded microwave dielectric ceramic and preparation method thereof

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preparation example Construction

[0037] A preparation method for rapid prototyping microwave dielectric ceramics, comprising the following steps:

[0038] Step 1), take the raw materials according to the ratio of mass and number: ceramic powder: deionized water = (18-22): (23-27);

[0039] Step 2), taking the biomolecular crosslinking agent, plasticizer and lubricant are respectively 0.5-1%, 0.06-0.16% and 0.1-0.4% of the quality of deionized water, and the biomolecular crosslinking agent and plasticizer are simultaneously Add part of deionized water, stir evenly at 75°C-90°C, then add a pH regulator to adjust the pH value to 8-10 to obtain mixture A;

[0040] Step 3), cooling mixture A to 60°C-65°C, adding lubricant and stirring to obtain mixture B;

[0041] Step 4), after mixing the ceramic powder and the remaining deionized water evenly, add it to the mixture B, and mix evenly to obtain the mixture C;

[0042] Step 5), the mixture C is continuously stirred until it is viscous, and then poured into a mold...

Embodiment 1

[0053] (1) Take 25g of deionized water 14g and 11g in two bottles, then take 0.16g of agarose and 0.025g of ethylene glycol, add 14g of deionized water and heat on a magnetic stirrer, set the temperature to 75 ° C, use a dropper Take 0.025g of ethylene glycol reagent into a small beaker, and then add the weighed agarose powder to avoid sticking to the wall of the cup; ethylene glycol will form a hydrogen bond with the agarose in the solution and act as a plasticizer to improve the green body. Intensity, finally add ammonia water to adjust the mixed solution to pH = 9, and put it on a magnetic stirrer, set the temperature at 85°C, and rotate at 200r / min to completely dissolve the agarose to obtain mixture A;

[0054] (2) When the small particles in it obviously disappear, it means that the agarose has been completely dissolved. Cool down the mixture A when the temperature reaches 65°C, add 0.05g of ethanol and continue to stir until it is uniform to obtain the mixture B. It pla...

Embodiment 2

[0063] (1) Take 25g deionized water 14g and 11g in two bottles, then take 0.16g gelatin and 0.025g ethylene glycol, add 14g deionized water and heat it on a magnetic stirrer, set the temperature at 80°C, and take it with a dropper Add 0.025g of ethylene glycol reagent into the small beaker, then add the weighed gelatin powder to avoid sticking to the cup wall; ethylene glycol will form hydrogen bonds with gelatin in the solution, as a plasticizer to improve the green body strength, and finally Add lithium hydroxide to adjust the mixed solution to pH = 9, and place it on a magnetic stirrer with a set temperature of 85°C and a rotational speed of 200r / min to completely dissolve the gelatin to obtain a mixture A;

[0064] (2) When the small particles in it obviously disappear, it means that the gelatin has been completely dissolved. Cool the mixture A when the temperature reaches 65°C, add 0.05g lithium hydroxide and continue to stir until it is uniform to obtain the mixture B. Et...

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Abstract

The invention discloses rapidly-molded microwave dielectric ceramic and a preparation method thereof. A biological molecular material, a plasticizer and de-ionized water are mixed to obtain a crosslinking framework for gel casting; the biological molecular material and the plasticizer can form a hydrogen bond in a solution; the hydrogen bond is used as the plasticizer to improve the strength of agreen body; independently mixing ceramic powder and the residual de-ionized water, and a condition that the ceramic powder is directly mixed with the crosslinking framework for the gel casting to generate an adhering phenomenon is avoided, so that the ceramic powder can be sufficiently and uniformly mixed with the crosslinking framework; finally, ceramic is rapidly formed at certain temperature through adhering and sintering, the sample preparation time is greatly shortened and defects caused by the fact that organic matters are not adhered completely are avoided at the same time, so that themicrowave dielectric ceramic with good performance can be obtained; compared with a sample prepared by utilizing a traditional solid-phase method utilizing the same powder, a microwave dielectric ceramic sample prepared by the method has better performance; the dielectric loss is reduced by 26.01 percent, the Q-unloaded is improved by 35.6 percent and the QF (Quality Factor) value is improved by 76.85 percent.

Description

technical field [0001] The invention belongs to the field of microwave dielectric ceramic manufacturing, and in particular relates to a rapid prototyping microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics (MWDC) refer to ceramics that are used as dielectric materials in microwave frequency bands (mainly UHF, SHF frequency bands, 300MHz~300GHz) circuits and perform one or more functions. A hot direction in the field. However, in order to meet the microwave parameter requirements of the device, it is often necessary to process the ceramic sample into a special shape such as a circular truncated cone. If the traditional solid-state process is continued to be used, the entire manufacturing process will be labor-intensive and time-consuming. [0003] Gel-casting technology (Gel-casting) is an advanced ceramic molding technology first proposed by Oak Ridge National Laboratory in the United States in the 1990s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/46C04B35/495C04B35/622
CPCC04B35/46C04B35/495C04B35/622C04B2235/6562C04B2235/6567C04B2235/96
Inventor 汪宏李熠向锋
Owner XI AN JIAOTONG UNIV
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