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Flash sintering method of low-temperature flash sintering ceramic and obtained ceramic and device thereof

A technology of rapid sintering and sintering method, applied in the field of ceramic sintering, can solve the problems of incomplete sintering mechanism of SPS, inability to make shaped products, less production of ceramic products, etc., to achieve superior ceramic quality, shorten sintering time, and save energy. Effect

Inactive Publication Date: 2017-05-10
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the basic mechanism of SPS sintering is still not completely clear, and a lot of practical and theoretical research is needed to perfect
Due to the capacity limitation of pulse current, the current SPS cannot sinter products larger than 300mm to achieve complete densification.
Moreover, the current design of SPS is not yet capable of making products with complex shapes
In addition, the price of SPS is relatively expensive. Although there are industrial products, the sintering cost is relatively high, and it is still rarely used in the production of actual ceramic products.

Method used

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  • Flash sintering method of low-temperature flash sintering ceramic and obtained ceramic and device thereof
  • Flash sintering method of low-temperature flash sintering ceramic and obtained ceramic and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The present invention provides a set of devices for implementing the flash sintering method of low-temperature rapid sintering ceramics, and the device is a set of flash sintering furnace (MX-100). On the basis of this equipment, flash sintering of ceramics can be carried out.

[0047] MX-100 consists of a tube furnace 1, a flange cooling device 2, an electrode 3, a power supply 4, an observation window 5, and an image data acquisition and processing system connected to the observation window. Tube Furnace 1 can prepare non-oxide ceramics in the sealed atmosphere mode, and can prepare oxide ceramics in the non-sealed mode, and the maximum temperature can reach 1700 degrees Celsius, so it can meet the preparation of most oxidized and non-oxidized ceramics need.

[0048] An observation window 5 is added to the flange of the inlet end of the tube furnace 1, which can be used for image observation in the experiment; a platinum electrode is installed on the flange of the ga...

Embodiment 2

[0052] Utilize the device among the embodiment 1 to sinter the ceramic green body, concrete steps are as follows:

[0053] First, use cold isostatic pressing to press the ceramic green body of zirconia ceramic nano powder under the pressure of 200MPa. The purity of zirconia ceramic powder is 99.95%, the average particle size is 160nm, and the density of the ceramic green body after cold isostatic pressing is 60%. , the thickness is 1cm;

[0054] Drill holes at both ends of the green body, and insert platinum electrodes into the holes to wrap and fix the green body. The distance between the electrodes is about 100mm;

[0055] Connect the electrode to the DC power supply with wires, turn on the power supply, set the power supply to 200V / cm, and set the current upper limit to 0.5A;

[0056] Set the tube furnace heating program: start from room temperature, heat up to 1000 degrees Celsius at a rate of 8 degrees Celsius per minute, and then heat up to 1400 degrees Celsius at a rat...

Embodiment 3

[0063] Utilize the device among the embodiment 1 to sinter the ceramic green body, concrete steps are as follows:

[0064] First, use cold isostatic pressing to press the ceramic green body of silicon carbide ceramic nanopowder under the pressure of 200MPa. The purity of silicon carbide ceramic powder is 99.5%, the average particle size is 80nm, and the density of ceramic green body after cold isostatic pressing is 55%. , the thickness is 2mm;

[0065] Drill holes at both ends of the ceramic green body, and insert platinum electrodes into the holes to wrap and fix the green body. The distance between the electrodes is about 100mm;

[0066] Connect the electrode to the DC power supply with wires, turn on the power supply, set the power supply to 1000V / cm, and set the current upper limit to 0.5A;

[0067] Set the tube furnace heating program: start from room temperature, heat up to 1000 degrees Celsius at a rate of 8 degrees Celsius per minute, and then heat up to 1650 degrees ...

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Abstract

The invention relates to the filed of ceramic sintering, in particular to a flash sintering method of a low-temperature flash sintering ceramic and an obtained ceramic and a device thereof. The flash sintering method of the low-temperature flash sintering ceramic comprises the following steps: loading a voltage at two ends of a ceramic green body, and setting a current upper limit; heating the ceramic green body, when the temperature reaches a characteristic temperature, the temperature suddenly rising and meanwhile bright spots appearing around an anode, then a flash phenomenon appearing, and completing sintering of the ceramic green body within several seconds. According to the method, the flash phenomenon occurs when the temperature is heated to a certain characteristic temperature through voltage assist, and the sintering is completed within several seconds, so that the sintering temperature can be effectively reduced, and the sintering time can be greatly shortened. Moreover, according to the sintering method, the energy resources are saved, the sintering efficiency is improved, the production cost is reduced, ceramic products with large dimensions and complicated shapes can be produced, the density of a sintered ceramic block body is generally more than 95%, and the quality of the sintered and obtained ceramic is excellent.

Description

technical field [0001] The invention relates to the field of ceramic sintering, in particular to a flash sintering method for low-temperature rapid sintering ceramics, the prepared ceramics and a device thereof. Background technique [0002] Rapid sintering is the mainstream trend of ceramic sintering technology in the world in recent years. At present, the sintering technology that meets the requirements of rapid sintering is mainly spark plasma sintering (SPS). Plasma is a dissociated high-temperature conductive gas with high reactivity. Since the plasma temperature is generally 4000-10999°C, its gaseous molecules and atoms are in a highly activated state, and the degree of ionization in the plasma gas is high, these properties make plasma a very important material preparation and processing technology. The sintering method uses pulsed current to make the particles uniformly generate Joule heat and activate the surface of the particles to become a discharge plasma, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/48C04B35/565C04B35/58C04B35/583C04B35/584C04B35/56C04B35/64F27B17/02F27D11/10
CPCC04B35/10C04B35/48C04B35/56C04B35/565C04B35/58C04B35/583C04B35/584C04B35/64F27B17/02F27D11/10
Inventor 徐晨蔡仕魁王小英
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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