Direct flash-burning molding preparation method from ceramic powder raw material

A technology for ceramic powder and raw materials, applied in the field of ceramic sintering molding technology and its use equipment, can solve the problems of incapable of sintering body preparation, achieve the effect of precise product shape and size, and simplify the production process

Active Publication Date: 2018-12-07
苏州山人纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing sintering equipment can only be used for the preparation of rough and green bodies, and cannot be used for the preparation of dense sintered bodies

Method used

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  • Direct flash-burning molding preparation method from ceramic powder raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] see figure 1 , This embodiment shows a ceramic powder raw material direct forming flash firing equipment, including a pressurization device 1, a vacuum chamber 3, an auxiliary heating power supply 6, a high voltage DC flash firing power supply 4, a control system 5, and a cooling system 7.

[0029] The sample powder is placed in a mold composed of high-temperature ceramics and graphite, which is located in the center of the vacuum chamber and is constrained by the pressure of the pressurized system.

[0030] The auxiliary heating power enters the vacuum chamber through the outer wall of the vacuum chamber to heat the ceramic powder raw material.

[0031] The high-voltage DC flash power supply applies voltage to the graphite mold through the water-cooled copper electrodes at the upper and lower pressure heads of the pressurizing device.

[0032] When in use, the heating element of the auxiliary heating system provides the required temperature for pre-heating the ceramic...

Embodiment 2

[0046] Using the ceramic powder raw material shown in Example 1 to directly form the flash firing equipment to carry out the sintering of flat zirconia ceramics, the steps are as follows:

[0047] (1) Pour the composite zirconia granulation powder into the mold and vibrate to make the surface smooth;

[0048] (2) Put the mold into the equipment of the present invention, and apply a pressure of 50 MPa, so that the ceramic powder raw material is in the middle of the heating zone;

[0049] (3) Turn on the auxiliary heating power supply (here is the induction heating power supply), and heat to 1000°C at a speed of 100°C / min;

[0050] (4) Turn on the high-voltage DC flash power supply, pass DC power on both sides of the sample, and increase the voltage linearly by about 100V / cm until the flash phenomenon occurs, then quickly switch to current control, with 100mA / mm 2 The electric current sinters for 2 minutes, and cools down to room temperature to obtain a dense sintered body.

[0...

Embodiment 3

[0054] Use the ceramic powder raw material direct molding flash firing equipment shown in Example 1 to carry out the sintering of the rare earth oxide transparent ceramic scintillator, and the steps are as follows:

[0055] (1) Granulate mixed rare earth oxide powder (the components are lutetium oxide, gadolinium oxide and europium oxide, wherein the content of lutetium oxide is 70-90mol%, the content of gadolinium oxide is 10-20mol%, and the content of europium oxide is 0-10mol% ) is poured into the mold and shaken to make it smooth;

[0056] (2) Put the mold into the equipment of the present invention, apply a pressure of 40MPa, so that the ceramic powder raw material is in the middle of the heating zone;

[0057] (3) Turn on the auxiliary heating power supply (here is the induction heating power supply), and heat to 900°C at a speed of 100°C / min;

[0058] (4) Turn on the high-voltage DC flash power supply, pass DC power on both sides of the sample, and increase the voltage...

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Abstract

The invention provides a direct flash-burning molding preparation method from a ceramic powder raw material. The method comprises the following steps: (1) pouring a raw material into a die, vibratingto flatten the surface of the raw material; (2) putting the die into ceramic powder raw material direct molding flash-burning equipment, applying pressure of 40-50MPa to lead the ceramic powder raw material at the center of a heat area; (3) opening an assistant heat power supply (which is a conductive heat power supply), heating to 900-1000 DEG C at a speed of 100-110 DEG C / min or until a flashingphenomenon happens; (4) opening a high-voltage direct-current flash-burning power supply, supplying direct-current electricity to two sides of a sample, linearly increasing voltage of about 200V / cm until the flashing phenomeon happens; (5) controlling the current to be reduced to 1000A or less, and keeping the current to be constant, and lasting for 20-50 seconds; (6) cooling to room temperatureto obtain a compact sintering body; and (7) grinding and polishing the sintering body to obtain a required product.

Description

technical field [0001] The invention relates to the technical field of ceramic sintering molding technology and equipment used therefor. Specifically, it shows a method for preparing ceramic powder raw materials by direct flash firing molding. Background technique [0002] Ceramic material is an important industrial material. Different ceramics have different mechanical, electrical, optical, acoustic, magnetic and other properties, so they have a variety of applications and become an indispensable important material in modern society. [0003] The preparation process of ceramic materials is various, generally using the forming-sintering-machining process. Sintering is the most important process in the preparation process of ceramic materials, and it is an important link in the performance of materials. In the traditional high-temperature sintering process, it needs to consume a lot of energy, which may cause serious environmental problems. In order to save energy and prote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/48C04B35/50
CPCC04B35/48C04B35/50C04B35/622C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/77C04B2235/785C04B2235/96
Inventor 周晖雨贾建平贾建顺
Owner 苏州山人纳米科技有限公司
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