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Preparation method of biomimetic nacre max phase carbide ceramic matrix composite material

A composite material and carbide technology, which is applied in the field of preparation of bionic nacre MAX phase carbide ceramic matrix composite materials, can solve the problems of poor strength and toughness and lack of biomimetic structure, and achieves a simple and easy process route and preparation method. The effect of large-scale promotion and improved mechanical properties

Active Publication Date: 2021-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a biomimetic nacre MAX phase carbide ceramic matrix composite material, which solves the problems of poor strength and toughness of existing MAX phase carbide ceramics and does not have a biomimetic structure.

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  • Preparation method of biomimetic nacre max phase carbide ceramic matrix composite material
  • Preparation method of biomimetic nacre max phase carbide ceramic matrix composite material

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Embodiment 1

[0031] In this embodiment, the preparation method of the biomimetic nacre MAX phase carbide ceramic matrix composite material is as follows:

[0032] Lamellar Ti with a particle size of 200 nm 3 AlC 2 100 grams of powder, 5 grams of polyvinyl alcohol with a molecular weight of 4000, and 2 grams of ammonium polyacrylate as a dispersant, were added into 200 grams of deionized water, and mechanically stirred to mix evenly. Put the simply mixed slurry into a 500mL polyurethane ball mill tank, and add 200 grams of polyurethane-coated iron balls. The ball mill jar is installed on the planetary ball mill for ball milling, the ball milling speed is 380 rpm, after 10 hours of ball milling, the slurry after ball milling is taken out, and the ball milling beads are sorted out for use. The obtained slurry was put into a polytetrafluoroethylene mold, a copper plate was placed at the bottom of the mold, and liquid nitrogen was introduced from the bottom of the copper plate at a flow rate ...

Embodiment 2

[0037] In this embodiment, the preparation method of the biomimetic nacre MAX phase carbide ceramic matrix composite material is as follows:

[0038] Lamellar Nb with a particle size of 220 nm 2 200 grams of AlC powder, 6 grams of polyvinyl alcohol with a molecular weight of 4000, and 3 grams of ammonium polyacrylate as a dispersant were added to 250 grams of camphene, and mechanically stirred and mixed evenly. Put the simply mixed slurry into a 500mL polyurethane ball mill tank, and add 250 grams of polyurethane-coated iron balls. The ball mill jar is installed on a planetary ball mill for ball milling, the ball milling speed is 400 rpm, after 10 hours of ball milling, the slurry after ball milling is taken out, and the ball milling beads are sorted out for use. The obtained slurry was put into a polytetrafluoroethylene mold, a copper plate was placed at the bottom of the mold, and liquid nitrogen was introduced from the bottom of the copper plate at a flow rate of 1L / hour, ...

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Abstract

The invention relates to an MAX phase ceramic matrix composite material, and particularly relates to a method for preparing a bionic nacre MAX phase carbide ceramic matrix composite material. According to the invention, lamellar MAX powder is taken as brick fragments for building and piling up a composite material, a ceramic composite structure similar to a lamellar solidified crystal in a natrualpearl shell is obtained by a low-temperature freezing liquid medium by utilizing the orientation of liquid medium crystal growth in temperature gradient, then and then the medium crystal is removed,so as to obtain the embryo of ceramic macromolecule of a continuous lamellar hole or lamellar structure. In the pressure sintering process, a macromolecular polymer is used as carbon source for in-situ reaction to generate a lamellar carbide. Finally, nanometer or micrometer MAX phase lamellae are obtained to form the brick fragments, and a carbide layer growing in situ in the middle of the MAX phase lamellae forms a long-range order brick fragment-plaster structure of an imitation pearl layer material of plaster. Such structure, like biological ceramics in the natural world, has very high resistance to external load and crack propagation.

Description

technical field [0001] The invention relates to a MAX phase ceramic matrix composite material, in particular to a preparation method of a biomimetic pearl layer MAX phase carbide ceramic matrix composite material. Background technique [0002] MAX phase ceramics (such as: Ti 3 SiC 2 、Ti 2 AlC, Nb 2 AlC, etc.) is a class of machinable ceramics with a nano-ternary layered structure and many unique and excellent properties. This type of material has both the properties of ceramics and metals. Such as: high melting point, anti-oxidation and corrosion resistance of ceramic materials, electrical conductivity, machinability, damage capacitance, thermal shock resistance and other properties of metals, and radiation damage resistance of nano-ceramics. Due to its unique ternary nano-layered structure, the fracture toughness of this type of ceramic is much higher than that of ordinary alumina, silicon carbide and other engineering ceramics. However, compared with metals, the stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/56C04B35/5607C04B35/5618C04B2235/656C04B2235/6581C04B2235/96
Inventor 杨锐谢曦崔玉友贾清柏春光
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI