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Zirconium dioxide toughened flaky aluminum oxide-based composite ceramic and preparation method thereof

A technology of flake alumina and composite ceramics, which is applied in the field of composite materials, can solve problems such as poor toughness, achieve the effects of increasing the probability of crack bridging, improving fracture toughness and strength, and saving costs

Active Publication Date: 2018-11-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a zirconia toughened plate-shaped alumina-based composite ceramic and a preparation method thereof, which solves the problem of existing ZTA composite ceramic matrix Al 2 o 3 The shape is equiaxed shape, the technical problem of poor toughness

Method used

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  • Zirconium dioxide toughened flaky aluminum oxide-based composite ceramic and preparation method thereof
  • Zirconium dioxide toughened flaky aluminum oxide-based composite ceramic and preparation method thereof
  • Zirconium dioxide toughened flaky aluminum oxide-based composite ceramic and preparation method thereof

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Embodiment 1

[0057] (1) Take a certain amount of deionized water and place it in a beaker, add Al 2 o 3 Powder and ZrO 2 2% polyacrylic acid (PAA) and 1% polyethylene glycol (PEG) by powder mass, the beaker is placed on a magnetic stirring device and stirred at a speed of 60-90°C and 150-250rpm until completely dissolved;

[0058] (2) Slowly add 20-40g Al to the solution obtained in step (1) 2 o 3 powder and adjust the pH of the solution to 10-11;

[0059] (3) Place the beaker in an ultrasonic cleaning machine, and at the same time use a paddle-type stirring device to stir, and slowly add 5 to 10 g of ZrO 2 Powder. After adding, continue to ultrasonically and collaboratively stir for 30 minutes to prepare ZTA ceramic slurry;

[0060] (4) placing the ZTA slurry in step (3) in a planetary ball mill jar, and using zirconia balls to carry out planetary ball milling for 2 to 4 hours;

[0061] (5) Dry the ZTA slurry after planetary ball milling with a rotary evaporator, and obtain the ZTA...

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Abstract

The invention relates to zirconium dioxide toughened flaky aluminum oxide-based composite ceramic and a preparation method thereof. The invention discloses a preparation method of the zirconium dioxide toughened flaky aluminum oxide-based composite ceramic. The preparation method comprises the following steps: successively adding a first dispersing agent, Al2O3 powder and ZrO2 powder, mixing, adding a second dispersing agent, sintering to obtain the ZrO2 toughened flaky Al2O3-based composite ceramic, wherein the first dispersing agent is prepared from PAA and PEG; and the second dispersing agent is prepared from AMP and PEG. The preparation method is simple in operation, the preparation cost is reduced, Al2O3 crystal grains in a ZTA composite ceramic matrix has the directional growth, hascertain length-to-diameter ratio, and is of a flaky structure; and by adopting the structure, the probability of the crack deflection and crack bridging in the breaking process can be increased, so that on the premise of not influencing the hardness of the ZTA composite ceramics, the breaking toughness and strength of the ZTA composite ceramic can be significantly improved, and the problems that the shape of the existing ZTA composite ceramic matrix Al2O3 is of an isometric morphology and the toughness is poor can be solved.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a zirconium dioxide toughened plate-shaped alumina-based composite ceramic and a preparation method thereof. Background technique [0002] Alumina (Al 2 o 3 )-based ceramic materials have excellent characteristics such as high temperature resistance, high strength, creep resistance, wear resistance, good insulation, light weight, and oxidation resistance. They are ideal structural ceramic materials and are widely used. With the development of technology and the expansion of application fields, the Al 2 o 3 The performance requirements of base ceramic materials are also increasing day by day. [0003] Al 2 o 3 Ceramic, also known as corundum, has a Mohs hardness of 9, which is extremely hard. But since Al 2 o 3 The high brittleness of ceramics limits its application range. In order to overcome this shortcoming and improve the safety and reliability during use...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/634
CPCC04B35/10C04B35/622C04B35/63404C04B35/63488C04B2235/3244
Inventor 林东涛孟凡左飞吕健林华泰
Owner GUANGDONG UNIV OF TECH
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