Al based on azeotropic distillation 2 o 3 /zro 2 Composite ceramics and its preparation method and application

A technology of azeotropic distillation and composite ceramics, which is applied in the direction of ceramic molding machines, manufacturing tools, branch equipment, etc., can solve the problems of unfavorable industrial production, narrow sintering temperature range, uneven powder particle size, etc., and achieve the purpose of inhibiting grain growth, The effect of wide sintering range and lower sintering temperature

Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method of its composite powder is to use the encapsulation technology to combine α-Al 2 o 3 The powder is added to the inorganic salt solution of Al, La, Zr, Y, and ammonia water is added dropwise to form a precipitate, which is obtained after filtration, washing, and calcination, but this makes the powder particle size uneven, and its sintering temperature range is very narrow, which is not conducive to industrial production

Method used

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  • Al based on azeotropic distillation <sub>2</sub> o <sub>3</sub> /zro <sub>2</sub> Composite ceramics and its preparation method and application
  • Al based on azeotropic distillation <sub>2</sub> o <sub>3</sub> /zro <sub>2</sub> Composite ceramics and its preparation method and application
  • Al based on azeotropic distillation <sub>2</sub> o <sub>3</sub> /zro <sub>2</sub> Composite ceramics and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A kind of Al based on azeotropic distillation 2 o 3 / ZrO 2 A preparation method for composite ceramics, comprising the steps of:

[0047] 1) ZrOCl 2 , YCl 3 , AlCl 3 、LaCl 3 Mix with ethanol to obtain a mixed solution with a cation concentration of 0.3mol / L, and Zr in the solution 4+ with Al 3+ The molar ratio is 5:3, Y 3+ with Zr 4+ The molar ratio is 3:100, La 3+ with Zr 4+ and Al 3+ The molar ratio of the total amount is 0.4:100,.

[0048] 2) After adding 1% of the total mass of surfactant PEG400 and 1% of PEG2000 into the mixed solution, mechanical stirring was performed at a speed of 800 r / min for 5 minutes. Ammonia solution was added dropwise again, and the dropwise addition was stopped when the pH was 9.5.

[0049]3) The obtained translucent sol was aged for 18 hours, then centrifuged, and washed with deionized water and ethanol in sequence to obtain the sol.

[0050] 4) After adding n-butanol to the gel, carry out mechanical stirring. The ratio of...

Embodiment 2

[0058] A kind of Al based on azeotropic distillation 2 o 3 / ZrO 2 A preparation method for composite ceramics, comprising the steps of:

[0059] 1) ZrOCl 2 , YCl 3 , AlCl 3 、LaCl 3 Mix with ethanol to obtain a mixed solution with a total cation concentration of 0.5mol / L, Zr in the solution 4+ with Al 3+ The molar ratio is 8:1, Y 3+ with Zr 4+ The molar ratio is 2.3:100, La 3+ with Zr 4+ and Al 3+ The molar ratio of the total amount is 0.3:100.

[0060] 2) Add salt (ZrOCl 2 , YCl 3 , AlCl 3 、LaCl 3 ) Surfactant PEG2000 with a total mass of 2.5%, followed by mechanical stirring at a speed of 500 r / min for 8 min. Ammonia water was then added dropwise, and the dropwise addition was stopped when the pH was 9.

[0061] 3) The obtained translucent sol was left to age for 24 hours, then centrifuged, and washed with deionized water and ethanol in sequence to obtain a gel.

[0062]4) Add n-butanol to the gel, the ratio of the amount of n-butanol added to the gel volum...

Embodiment 3

[0067] A kind of Al based on azeotropic distillation 2 o 3 / ZrO 2 A preparation method for composite ceramics, comprising the steps of:

[0068] 1) ZrOCl 2 , YCl 3 , AlCl 3 、LaCl 3 Mix with ethanol to obtain a mixed solution with a cation concentration of 0.6mol / L, and Zr in the solution 4+ with Al 3+ The molar ratio is 2:1, Y 3+ with Zr 4+ The molar ratio is 2:100, La 3+ with Zr 4+ and Al 3+ The molar ratio of the total amount is 0.2:100,.

[0069] 2) After adding 1% total mass of surfactants PEG400 and 3% PEG2000 into the mixed solution, perform mechanical stirring at a speed of 600 r / min for 8 minutes. Ammonia water was then added dropwise, and the dropwise addition was stopped when the pH was 10.

[0070] 3) The obtained translucent sol was left to age for 22 hours, then centrifuged, and washed with deionized water and ethanol in sequence to obtain a gel.

[0071] 4) After adding n-butanol to the gel, carry out mechanical stirring, the amount of n-butanol ad...

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Abstract

The invention discloses Al based on the azeotropic distillation method 2 o 3 / ZrO 2 Composite ceramics and their preparation methods and applications. The preparation method uses zirconium salts, yttrium salts, aluminum salts, and lanthanum salts as raw materials to prepare nano-scale composite powders by co-precipitation and azeotropic distillation. After molding, calcination and high-temperature sintering get Al 2 o 3 / ZrO 2 Composite ceramics. The composite powder obtained by the present invention is nano-scale, basically spherical, uniform in particle size distribution, and wide in sintering temperature range; ZrO 2 Al is dispersed in the matrix 2 o 3 Grains and long rods of LaAl grown in situ 11 o 18 At the same time, the mechanism of phase change toughening, particle toughening and whisker toughening is introduced to improve the fracture toughness, flexural strength and hardness of ceramic materials. The composite material also has good anti-aging performance, integrating good mechanical properties and high The stability is integrated, and it can be used for the ceramic backplane of 5G mobile phones. The preparation method is simple, easy to operate, and conducive to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of oxide ceramic materials, more specifically, relates to an Al 2 o 3 / ZrO 2 Composite ceramics and their preparation methods and applications. Background technique [0002] With the advent of the 5G era, the requirements for receiving signals from mobile phones, an indispensable mobile terminal for each of us, are getting higher and higher. At present, the materials used in the mobile phone backplane on the market mainly include metal, glass engineering plastics, etc. Among these mainstream materials, only metal can meet the requirements of strength and appearance, but it will interfere and shield mobile phone signals, which is undoubtedly a fatal blow to the development of the communication 5G era. The ceramic material has the characteristics of high strength, high hardness, and high wear resistance, and its texture is as warm and moist as jade. As a mobile phone backplane, it will be practical and bea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/10C04B35/626C04B35/80C04B35/81C04B35/624H04M1/02B28B3/00B28B11/24
CPCB28B3/003B28B3/006B28B11/243C04B35/10C04B35/48C04B35/624C04B35/62645C04B2235/3222C04B2235/3225C04B2235/3227C04B2235/444H04M1/0283
Inventor 饶平根黄雪娟
Owner SOUTH CHINA UNIV OF TECH
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