Ultrasonic vibration activation assisted microwave sintering furnace

A technology of ultrasonic vibration and microwave sintering, applied in furnaces, crucible furnaces, furnace types, etc., can solve problems such as microwave sintering applications that have not been seen, and achieve the effects of high density, low porosity, and large contact area

Inactive Publication Date: 2015-06-24
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultrasound has unique mechanical effects, thermal effects and cavitation effects. The use of ultrasonic technology to activate assisted sintering can further refine the structure of sintered products and further reduce the porosity of sintered products, but it has not been used in microwave sintering so far.

Method used

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  • Ultrasonic vibration activation assisted microwave sintering furnace
  • Ultrasonic vibration activation assisted microwave sintering furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Such as figure 1 Schematic diagram of a microwave sintering furnace assisted by ultrasonic vibration activation using a wave-guiding crucible. The microwave frequency of the microwave sintering furnace assisted by ultrasonic vibration activation provided by the present invention is 2.45 GHz. In the silicon nitride wave guiding crucible 4, there are temperature measuring holes 9 for temperature monitoring through an infrared thermometer on the top of the furnace shell and the top of the silicon nitride wave guiding crucible, the center line of the two temperature measuring holes and the center of the sample to be fired lines are on the same vertical straight line, the silicon nitride wave-guiding crucible forms a wave-guiding heating chamber, the magnetron 2 passes through the furnace shell, and the microwave heats the silicon nitride wave-guiding crucible. The auxiliary sintering system activated by ultrasonic vibration is installed at the bottom. The hollow cylindrical...

Embodiment 2

[0020] Such as figure 2 A schematic diagram of an ordinary high-temperature crucible used in the ultrasonic vibration activation-assisted microwave sintering furnace. The microwave frequency of the ultrasonic vibration-activated auxiliary microwave sintering furnace provided by the present invention is 2.45 GHz, and the MnZn ferrite block 3 with good microwave absorption is placed in an ordinary high-temperature crucible 10. There is a temperature measuring hole 9 on the top of the furnace shell for temperature monitoring through an infrared thermometer. The center line of the temperature measuring hole 9 and the center line of the sample to be burned are on the same vertical line. The magnetron 2 passes through the furnace shell, and the microwave Heat the absorbing sample to be burned. The auxiliary sintering system activated by ultrasonic vibration is installed at the bottom. The hollow cylindrical annular alumina ceramic horn support frame 6 passes through the small hole ...

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Abstract

The invention aims at designing an ultrasonic vibration activation assisted sintering microwave sintering furnace according to the practical needs of new material research and development for the sintering technology and the advantages of the ultrasonic technology. The ultrasonic vibration activation assisted microwave sintering furnace is composed of a microwave source, magnetrons, a waveguide tube, a wave leading crucible or a common high-temperature crucible, an amplitude-change pole, an amplitude-change pole supporting frame, an ultrasonic generator, an ultrasonic transducer and the like. Electric signals generated by the ultrasonic generator are converted into ultrasonic vibration through the ultrasonic transducer, the ultrasonic vibration is transmitted to a sample to be sintered in the wave leading crucible or the common high-temperature crucible through the amplitude-change pole and the crucible, the sample to be sintered is in the ultrasonic vibration state in the microwave sintering process, material particles of the sample to be sintered are vibrated at a high speed under the microwave sintering temperature through the microwave radiation action, crystalline grains of the sample to be sintered are promoted to be quickly and evenly nucleated and grow or part of matter is evenly melted for quickly filling a gap. By means of the ultrasonic vibration activation assisted microwave sintering furnace, the sintered microstructure of a block sample can be more uniform and more compact, and the sample is better in the microstructure.

Description

technical field [0001] The invention relates to a microwave sintering furnace, in particular to a microwave sintering furnace which is activated by ultrasonic vibration to assist in sintering inorganic materials such as ceramics. Background technique [0002] Sintering is the core link in the preparation process of inorganic materials such as ceramics. During the sintering process, the material forms unique physical and chemical characteristics such as crystal structure, particle size, morphology, dislocations, and defects, so that the material has unique properties. The heating of the traditional sintering furnace relies on the heating element to transfer heat energy to the heated object through convection, conduction or radiation to reach a certain temperature. The heat is transferred from the outside to the inside. The sintering time is long and it is difficult to obtain fine grains. Microwave sintering is a new method of material sintering process. It has the characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B14/06F27B14/08F27B14/20
Inventor 邸永江施越袁京周杨攀张粼丰
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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