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Rapid ceramic sintering device and method

A fast sintering, ceramic technology, applied in the field of ceramic material processing, can solve the problems of universality and economic discount, uneven sample sintering, low energy utilization rate, etc., achieve high degree of ceramic densification, rich ceramic sintering technology, The effect of high energy efficiency

Active Publication Date: 2021-02-23
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the biggest shortcoming of the flash firing technology is that the samples are not uniformly sintered, and the critical conditions for the flash firing to a large extent depend on the power supply capability (such as the need for extremely high voltage to drive the ion or electron movement in the ceramic material), which Its universality and economy are greatly reduced
Moreover, flash firing technology is only suitable for single-piece production and has special requirements for samples. At the same time, traditional electric kilns have the disadvantages of long sintering cycle, high energy consumption, low energy utilization rate and high cost when preparing ceramic materials. Poor adaptability, needs to be improved

Method used

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  • Rapid ceramic sintering device and method
  • Rapid ceramic sintering device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A kind of rapid high temperature sintering Al described in this embodiment 2 o 3 The new method is as follows:

[0049] a. First, 30nm Al 2 o 3 The powder is mixed with 3wt.% PVA aqueous solution and ground evenly, then pressed into 20×20×4mm under the pressure of 400MPa 3 Al 2 o 3 Green body, the initial density is 50%;

[0050] b. Pre-burn the green body prepared in a at 600°C in the air for 1 hour to remove the organic matter PVA;

[0051] c. Place the 5 blanks obtained in b between the S-shaped stacked graphite soft felts 18 with a length of 150mm, a width of 20mm, and a thickness of 3mm, and place them in an S-shape and place them into the BN in the graphite mold 7 8 square holes on the side plate; then vacuumize the furnace to below 10Pa;

[0052] d. Power on, so that the current quickly reaches 35A, the sample is heated at a rate of 1000 ℃ / min to 1800 ℃, no pressure is applied, and the temperature is kept at this temperature for 20 seconds, and then the...

Embodiment 2

[0056] The difference between this example and Example 1 is that the initial alumina particle size is 500nm, the current size is 40A, the sintering temperature is 2000°C, other parameters and steps are the same as Example 1, and the measured density is as high as 95 %.

Embodiment 3

[0058] The difference between this embodiment and embodiment 1 is that the size of the sample 15 is φ12×4mm 2 , the size of graphite soft felt 18 is 150mm×20mm×5mm, the current size is 35A, the sintering temperature is 1800°C, other parameters and steps are the same as in Example 1, and the measured density is as high as 95%.

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Abstract

The invention relates to a rapid ceramic sintering device and method, and the rapid ceramic sintering device comprises a furnace body, an observation window formed in one side of the furnace body, anda pressurizing assembly and a temperature measuring assembly which are arranged in the furnace body, and also comprises an electrifying assembly and an insulating assembly; a graphite mold is arranged at the center of an inner cavity of the furnace body; a graphite soft felt which is arranged in an S shape and is provided with a sample is arranged in the graphite mold; the electrifying assembly is arranged above and below the graphite soft felt and is matched with a BN side plate; and the rapid ceramic sintering method comprises the following steps: pressing, powering on, heating, powering off and cooling. Compared with a traditional sintering method, the method has the advantages that the furnace body does not need to be heated, the heating speed is high, the sintering temperature is high, the period is short, the production efficiency is greatly improved, the energy consumption is reduced, meanwhile, the ceramic sintering technology is enriched, and the obtained ceramic is higher indensification degree and wider in applicability.

Description

technical field [0001] The invention relates to the technical field of ceramic material processing, in particular to a rapid sintering ceramic device and method. Background technique [0002] Ceramic materials are widely used in structural and functional fields due to their excellent properties such as high melting point, high strength, high hardness and high temperature thermal stability. At present, the preparation technologies of ceramic materials mainly include traditional high-temperature sintering, reaction sintering, hot isostatic pressing sintering, etc. These technologies usually rely on thermal convection or thermal radiation to heat ceramic green bodies, and the heating rate is low and the sintering cycle is long. , Low energy utilization. For high-temperature volatile ceramics (such as lithium-ion battery materials), longer sintering times lead to volatilization of components, which weakens the performance of the material. [0003] In order to reduce the sinter...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/50C04B35/622C04B35/638
CPCC04B35/10C04B35/50C04B35/622C04B35/638C04B2235/3244C04B2235/6562C04B2235/6567C04B2235/6565
Inventor 沈平郭瑞芬毛海荣赵志陶
Owner JILIN UNIV
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