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Method for preparing oxide eutectic ceramic through flash firing

A technology of eutectic ceramics and oxides, which is applied in the field of flash sintering to prepare oxide eutectic ceramics, can solve problems such as affecting high temperature creep resistance, and achieve the effect of small size and excellent mechanical properties

Pending Publication Date: 2019-08-16
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Al 2 o 3 / YAG / ZrO 2 Eutectic component ceramics require two-step preparation, and contain a large number of grain boundaries in the sintered body, which will affect its high temperature creep resistance

Method used

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  • Method for preparing oxide eutectic ceramic through flash firing
  • Method for preparing oxide eutectic ceramic through flash firing
  • Method for preparing oxide eutectic ceramic through flash firing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of aluminum oxide-yttrium aluminum garnet binary eutectic ceramics comprises the following steps:

[0036] Step 1: Mole ratio Al 2 o 3 :Y 2 o 3 = 80.8:19.2 Weigh the powder, a total of 20 g;

[0037]Step 2: Add 200 mL of deionized water and 2% polyethylene glycol-800 to the weighed powder, mix in a roller ball mill, the speed of the ball mill is 60 r / min, and the ball milling time is 20 h ;

[0038] Step 3: Carry out drying treatment to the obtained slurry, the drying temperature is 80 o C, the time is 12 h, and a uniformly mixed ceramic powder is obtained.

[0039] Step 4: adding PVA to the dried ceramic powder for granulation, the concentration of PVA is 3 wt%.

[0040] Step 5: The granulated powder is molded into a dog-bone-shaped sample with a pressure of 200 MPa and a hold pressure of 60 s. The sample is then placed in a cold isostatic press for secondary pressure at a pressure of 290 MPa.

[0041] Step 6: Place the resulting green b...

Embodiment 2

[0045] A preparation method of alumina-yttrium aluminum garnet binary eutectic ceramics, comprising the steps of:

[0046] Step 1: Mole ratio Al 2 o 3 :Y 2 o 3 = 80.8:19.2 Weigh the powder, a total of 20 g;

[0047] Step 2: Add 200 mL of deionized water and 2% polyethylene glycol-800 to the weighed powder, mix in a roller ball mill, the speed of the ball mill is 60 r / min, and the ball milling time is 20 h ;

[0048] Step 3: Carry out drying treatment to the obtained slurry, the drying temperature is 80 o C, the time is 12 h, and a uniformly mixed ceramic powder is obtained.

[0049] Step 4: adding PVA to the dried ceramic powder for granulation, the concentration of PVA is 3 wt%.

[0050] Step 5: The granulated powder is molded into a dog-bone-shaped sample with a pressure of 200 MPa and a hold pressure of 60 s. The sample is then placed in a cold isostatic press for secondary pressure at a pressure of 290 MPa.

[0051] Step 6: Place the resulting green body at 800 o...

Embodiment 3

[0055] A preparation method of alumina-yttrium aluminum garnet binary eutectic ceramics, comprising the steps of:

[0056] Step 1: Mole ratio Al 2 o 3 :Y 2 o 3 = 80.8:19.2 Weigh the powder, a total of 20 g;

[0057] Step 2: Add 200 mL of deionized water to the weighed powder, and polyethylene glycol-800 with a mass fraction of 2% as a surfactant, mix in a roller ball mill, and the speed of the ball mill is 60 r / min, Ball milling time 20 h;

[0058] Step 3: Carry out drying treatment to the obtained slurry, the drying temperature is 80 o C, the time is 12 h, and a uniformly mixed ceramic powder is obtained.

[0059] Step 4: adding PVA to the dried ceramic powder for granulation, the concentration of PVA is 3 wt%.

[0060] Step 5: The granulated powder is molded into a dog-bone-shaped sample with a pressure of 200 MPa and a hold pressure of 60 s. The sample is then placed in a cold isostatic press for secondary pressure at a pressure of 290 MPa.

[0061] Step 6: Place t...

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Abstract

The invention discloses a method for preparing oxide eutectic ceramic through flash firing. The method comprises the following steps: a) weighing ceramic powder according to a designed formula; b) carrying out ball milling, drying, granulation and compression molding treatment, and then carrying out heat treatment on the obtained green body at 0.5 Tm for 2 h; c) connecting the sample with a platinum electrode in a sintering furnace, and heating to a set temperature of 0.7-0.9 Tm; d) after the preset temperature is reached, performing heat preservation for a certain time; e) connecting a platinum electrode with a power source, presetting the electric field intensity as 100 to 1000 V / cm and the current density as 10 to 500 mA / mm<2>, and outputting an electric field to the sample, wherein theelectric field intensity is kept constant till the flash burning phenomenon occurs, and at the moment, the power source is converted into a constant-current state from a constant-voltage state; f) ina constant current state, carrying out heat preservation on the system for 1-60 minutes under a preset current density to obtain the oxide eutectic ceramic. Through coupling of an electric field anda temperature field, an oxide ceramic is promoted to rapidly form an eutectic structure below the eutectic temperature, and by adjusting sintering parameters, the morphology of the eutectic ceramic can be regulated and controlled. And the obtained eutectic structure is small in size and excellent in mechanical property.

Description

technical field [0001] The invention relates to the technical field of ceramic material preparation, in particular to a method for preparing oxide eutectic ceramics by flash firing. Background technique [0002] In recent years, due to the special pictographic structure of eutectic ceramics, phase boundaries have replaced the grain boundaries that exist in large quantities in polycrystalline ceramics, completely eliminating the glass phase and pores between polycrystalline ceramic grains, and have good strength, Fracture toughness, thermal stability, and creep resistance have attracted widespread attention internationally. [0003] Initially, oxide eutectic ceramics were prepared by directional solidification methods, such as the improved Bridgman method, micro-drawing method, laser horizontal zone melting method, etc. Although the directional solidification technology can better control the grain orientation of the solidified structure and improve the longitudinal mechanic...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/44C04B35/505C04B35/622C04B35/64
CPCC04B35/10C04B35/44C04B35/505C04B35/622C04B35/64C04B2235/3206C04B2235/3224C04B2235/3227C04B2235/3244C04B2235/3208
Inventor 刘金铃徐湘刘佃光
Owner SOUTHWEST JIAOTONG UNIV
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