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Double-toughened composite ceramic material with shell-like structure and preparation method of double-toughened composite ceramic material

A composite ceramic and shell imitation technology, applied in the direction of climate change adaptation, etc., can solve the problems that the strength is difficult to meet the demand, unfavorable for wide application, complex preparation method, etc., and achieves the effects of environmental protection in the preparation process, improved mechanical properties, and simple process.

Active Publication Date: 2021-06-22
SUZHOU RES INST SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to increase the strength and toughness of composite materials at the same time, the prior art proposes a combination of ice formwork and infiltration technology to prepare ceramic-metal, ceramic-resin imitation shell structure layered composite materials, but the inventors found that although Enhanced strength and toughness can be obtained, but the strength is still difficult to meet the demand, and the preparation method adopted is complicated, the operation is difficult, and it is not widely used

Method used

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  • Double-toughened composite ceramic material with shell-like structure and preparation method of double-toughened composite ceramic material
  • Double-toughened composite ceramic material with shell-like structure and preparation method of double-toughened composite ceramic material
  • Double-toughened composite ceramic material with shell-like structure and preparation method of double-toughened composite ceramic material

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preparation example Construction

[0023] In order to solve the above technical problems, the first aspect of the present invention provides a method for preparing a double-toughened shell-like structure composite ceramic material. The specific steps include:

[0024] Step 1: Put flake alumina, nano-particle alumina, nano-particle zirconia, sodium lauryl sulfate, and polyvinylpyrrolidone in a ball mill tank, and add deionized water to ball mill;

[0025] Step 2: Pour the ball-milled slurry into a mold, pour liquid nitrogen into it to freeze, and place the frozen billet in a freeze dryer to obtain a green body;

[0026] Step 3: heat-treat the prepared green body at high temperature, and then heat-press and sinter after debinding.

[0027] Among them, the present invention uses flaky alumina, nano-particle alumina, and nano-particle zirconia as basic raw materials, and uses the structure of flaky alumina as the basis for constructing the bionic structure of shells. The characteristics of growth, get the layered ...

Embodiment 1

[0042] (1) Mixing: 33.6g flake alumina, 5.6g nano-alumina, 2.8g nano-zirconia, 0.42g polyvinylpyrrolidone (molecular weight is 10000g / mol), 0.42g sodium lauryl sulfate in 58g distilled water In the ball mill, mix at 400r / min for 3 hours.

[0043] (2) Freeze-drying: Pour the uniformly mixed slurry into a polytetrafluoroethylene mold with a heat-conducting stainless steel base, pour liquid nitrogen into an incubator to complete pre-cooling to prevent its settlement, and place it in a freeze dryer Freeze-drying is carried out according to a preset program to obtain a green body.

[0044] (3) Heat treatment and sintering: Take out the green body and place it in a crucible, put it into a high-temperature box furnace, raise the temperature to 1100°C at 10°C / min, and keep it warm for 3 hours to complete debinding. Put the heat-treated green body into a graphite mold for hot-press sintering, pass through an argon atmosphere, raise the temperature to 1100°C at 20°C / min, and then raise...

Embodiment 2

[0047] (1) Mixing: 33.6g flake alumina, 5.6g nano-alumina, 2.8g nano-zirconia, 0.42g polyvinylpyrrolidone (molecular weight is 30000g / mol), 0.42g sodium lauryl sulfate in 58g distilled water In the ball mill, mix at 400r / min for 3 hours.

[0048] (2) Freeze-drying: Pour the uniformly mixed slurry into a polytetrafluoroethylene mold with a heat-conducting stainless steel base, pour liquid nitrogen into an incubator to complete pre-cooling to prevent its settlement, and place it in a freeze dryer Freeze-drying is carried out according to a preset program to obtain a green body.

[0049] (3) Heat treatment and sintering: Take out the green body and place it in a crucible, put it into a high-temperature box furnace, raise the temperature to 1100°C at 10°C / min, and keep it warm for 3 hours to complete debinding. Put the heat-treated body into a graphite mold for hot-press sintering, pass through an argon atmosphere, raise the temperature to 1100°C at 20°C / min, and then raise the t...

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Abstract

The invention belongs to the technical field of composite structure ceramic materials, and particularly relates to a double-toughened shell-imitated structure composite ceramic material and a preparation method thereof. The preparation method comprises the following steps that 1, flaky aluminum oxide, nano-particle aluminum oxide, nano-particle zirconium oxide, lauryl sodium sulfate and polyvinylpyrrolidone are put into a ball milling tank, and deionized water is added for ball milling; 2, slurry obtained after ball milling is poured into a mold, liquid nitrogen is poured into the mold to freeze the slurry, the frozen blank is placed in a freeze dryer, and a green body is obtained; and 3, the prepared green body is subjected to heat treatment at high temperature, and hot pressed sintering is conducted after glue discharging is completed. According to the preparation method, a freeze-drying process is utilized, the mixed slurry of aluminum oxide and zirconium oxide is subjected to directional molding to obtain a green body with a brick mud structure, then the green body is subjected to hot pressed sintering to obtain the shell-imitated ceramic composite material composed of pure inorganic phases, the material has good bending strength and fracture toughness, the preparation process is simple, and the preparation process is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of composite structural ceramic materials, and in particular relates to a double-toughened composite ceramic material imitating a shell structure and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Shell nacre is a natural layered composite material. Through systematic research on pearl oysters, it is found that the structure of pearl oysters can generally be divided into three parts, the outermost layer is the cuticle, the second is the prismatic layer, and the innermost layer is nacre. Floor. The stratum corneum is very thin, mainly composed of protein, and its main functi...

Claims

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Application Information

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IPC IPC(8): C04B35/71C04B35/10C04B35/622C04B35/638C04B35/645
CPCC04B35/71C04B35/10C04B35/622C04B35/638C04B35/645C04B2235/3244C04B2235/6562C04B2235/6567C04B2235/96Y02A40/81
Inventor 王伟礼陈建奇孙晓宁孙国勋王璐梁延杰毕见强
Owner SUZHOU RES INST SHANDONG UNIV